Release v5.3.37

Closes gh-33010

build.gradle

@@ -28,8 +28,8 @@ configure(allprojects) { project ->
 	dependencyManagement {
 		imports {
 			mavenBom "com.fasterxml.jackson:jackson-bom:2.12.7"
-			mavenBom "io.netty:netty-bom:4.1.109.Final"
-			mavenBom "io.projectreactor:reactor-bom:2020.0.44"
+			mavenBom "io.netty:netty-bom:4.1.111.Final"
+			mavenBom "io.projectreactor:reactor-bom:2020.0.45"
 			mavenBom "io.r2dbc:r2dbc-bom:Arabba-SR13"
 			mavenBom "io.rsocket:rsocket-bom:1.1.3"
 			mavenBom "org.eclipse.jetty:jetty-bom:9.4.54.v20240208"
@@ -362,7 +362,7 @@ configure([rootProject] + javaProjects) { project ->
 		// JSR-305 only used for non-required meta-annotations
 		compileOnly("com.google.code.findbugs:jsr305")
 		testCompileOnly("com.google.code.findbugs:jsr305")
-		checkstyle("io.spring.javaformat:spring-javaformat-checkstyle:0.0.41")
+		checkstyle("io.spring.javaformat:spring-javaformat-checkstyle:0.0.42")
 	}
 
 	ext.javadocLinks = [

gradle.properties

@@ -1,4 +1,4 @@
-version=5.3.36-SNAPSHOT
+version=5.3.37
 org.gradle.jvmargs=-Xmx2048m
 org.gradle.caching=true
 org.gradle.parallel=true

integration-tests/src/test/java/org/springframework/cache/annotation/EnableCachingIntegrationTests.java

@@ -63,7 +63,7 @@ class EnableCachingIntegrationTests {
 		// attempt was made to look up the AJ aspect. It's due to classpath issues
 		// in .integration-tests that it's not found.
 		assertThatException().isThrownBy(ctx::refresh)
-			.withMessageContaining("AspectJCachingConfiguration");
+				.withMessageContaining("AspectJCachingConfiguration");
 	}
 
 

integration-tests/src/test/java/org/springframework/core/env/EnvironmentSystemIntegrationTests.java

@@ -561,8 +561,7 @@ public class EnvironmentSystemIntegrationTests {
 		{
 			ConfigurableApplicationContext ctx = new AnnotationConfigApplicationContext();
 			ctx.getEnvironment().setRequiredProperties("foo", "bar");
-			assertThatExceptionOfType(MissingRequiredPropertiesException.class).isThrownBy(
-					ctx::refresh);
+			assertThatExceptionOfType(MissingRequiredPropertiesException.class).isThrownBy(ctx::refresh);
 		}
 
 		{

integration-tests/src/test/java/org/springframework/transaction/annotation/EnableTransactionManagementIntegrationTests.java

@@ -97,7 +97,7 @@ class EnableTransactionManagementIntegrationTests {
 		ctx.register(Config.class, AspectJTxConfig.class);
 		// this test is a bit fragile, but gets the job done, proving that an
 		// attempt was made to look up the AJ aspect. It's due to classpath issues
-		// in .integration-tests that it's not found.
+		// in integration-tests that it's not found.
 		assertThatException()
 			.isThrownBy(ctx::refresh)
 			.withMessageContaining("AspectJJtaTransactionManagementConfiguration");

spring-aop/src/main/java/org/springframework/aop/aspectj/AspectJExpressionPointcut.java

@@ -18,6 +18,7 @@ package org.springframework.aop.aspectj;
 
 import java.io.IOException;
 import java.io.ObjectInputStream;
+import java.lang.reflect.Field;
 import java.lang.reflect.Method;
 import java.lang.reflect.Proxy;
 import java.util.Arrays;
@@ -86,6 +87,8 @@ import org.springframework.util.StringUtils;
 public class AspectJExpressionPointcut extends AbstractExpressionPointcut
 		implements ClassFilter, IntroductionAwareMethodMatcher, BeanFactoryAware {
 
+	private static final String AJC_MAGIC = "ajc$";
+
 	private static final Set<PointcutPrimitive> SUPPORTED_PRIMITIVES = new HashSet<>();
 
 	static {
@@ -107,6 +110,8 @@ public class AspectJExpressionPointcut extends AbstractExpressionPointcut
 	@Nullable
 	private Class<?> pointcutDeclarationScope;
 
+	private boolean aspectCompiledByAjc;
+
 	private String[] pointcutParameterNames = new String[0];
 
 	private Class<?>[] pointcutParameterTypes = new Class<?>[0];
@@ -138,7 +143,7 @@ public class AspectJExpressionPointcut extends AbstractExpressionPointcut
 	 * @param paramTypes the parameter types for the pointcut
 	 */
 	public AspectJExpressionPointcut(Class<?> declarationScope, String[] paramNames, Class<?>[] paramTypes) {
-		this.pointcutDeclarationScope = declarationScope;
+		setPointcutDeclarationScope(declarationScope);
 		if (paramNames.length != paramTypes.length) {
 			throw new IllegalStateException(
 					"Number of pointcut parameter names must match number of pointcut parameter types");
@@ -153,6 +158,7 @@ public class AspectJExpressionPointcut extends AbstractExpressionPointcut
 	 */
 	public void setPointcutDeclarationScope(Class<?> pointcutDeclarationScope) {
 		this.pointcutDeclarationScope = pointcutDeclarationScope;
+		this.aspectCompiledByAjc = compiledByAjc(pointcutDeclarationScope);
 	}
 
 	/**
@@ -278,6 +284,11 @@ public class AspectJExpressionPointcut extends AbstractExpressionPointcut
 	@Override
 	public boolean matches(Class<?> targetClass) {
 		if (this.pointcutParsingFailed) {
+			// Pointcut parsing failed before below -> avoid trying again.
+			return false;
+		}
+		if (this.aspectCompiledByAjc && compiledByAjc(targetClass)) {
+			// ajc-compiled aspect class for ajc-compiled target class -> already weaved.
 			return false;
 		}
 
@@ -532,6 +543,15 @@ public class AspectJExpressionPointcut extends AbstractExpressionPointcut
 		return shadowMatch;
 	}
 
+	private static boolean compiledByAjc(Class<?> clazz) {
+		for (Field field : clazz.getDeclaredFields()) {
+			if (field.getName().startsWith(AJC_MAGIC)) {
+				return true;
+			}
+		}
+		return false;
+	}
+
 
 	@Override
 	public boolean equals(@Nullable Object other) {

spring-aop/src/main/java/org/springframework/aop/aspectj/annotation/BeanFactoryAspectJAdvisorsBuilder.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2020 the original author or authors.
+ * Copyright 2002-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -22,9 +22,12 @@ import java.util.List;
 import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
 
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
 import org.aspectj.lang.reflect.PerClauseKind;
 
 import org.springframework.aop.Advisor;
+import org.springframework.aop.framework.AopConfigException;
 import org.springframework.beans.factory.BeanFactoryUtils;
 import org.springframework.beans.factory.ListableBeanFactory;
 import org.springframework.lang.Nullable;
@@ -40,6 +43,8 @@ import org.springframework.util.Assert;
  */
 public class BeanFactoryAspectJAdvisorsBuilder {
 
+	private static final Log logger = LogFactory.getLog(BeanFactoryAspectJAdvisorsBuilder.class);
+
 	private final ListableBeanFactory beanFactory;
 
 	private final AspectJAdvisorFactory advisorFactory;
@@ -102,30 +107,37 @@ public class BeanFactoryAspectJAdvisorsBuilder {
 							continue;
 						}
 						if (this.advisorFactory.isAspect(beanType)) {
-							aspectNames.add(beanName);
-							AspectMetadata amd = new AspectMetadata(beanType, beanName);
-							if (amd.getAjType().getPerClause().getKind() == PerClauseKind.SINGLETON) {
-								MetadataAwareAspectInstanceFactory factory =
-										new BeanFactoryAspectInstanceFactory(this.beanFactory, beanName);
-								List<Advisor> classAdvisors = this.advisorFactory.getAdvisors(factory);
-								if (this.beanFactory.isSingleton(beanName)) {
-									this.advisorsCache.put(beanName, classAdvisors);
+							try {
+								AspectMetadata amd = new AspectMetadata(beanType, beanName);
+								if (amd.getAjType().getPerClause().getKind() == PerClauseKind.SINGLETON) {
+									MetadataAwareAspectInstanceFactory factory =
+											new BeanFactoryAspectInstanceFactory(this.beanFactory, beanName);
+									List<Advisor> classAdvisors = this.advisorFactory.getAdvisors(factory);
+									if (this.beanFactory.isSingleton(beanName)) {
+										this.advisorsCache.put(beanName, classAdvisors);
+									}
+									else {
+										this.aspectFactoryCache.put(beanName, factory);
+									}
+									advisors.addAll(classAdvisors);
 								}
 								else {
+									// Per target or per this.
+									if (this.beanFactory.isSingleton(beanName)) {
+										throw new IllegalArgumentException("Bean with name '" + beanName +
+												"' is a singleton, but aspect instantiation model is not singleton");
+									}
+									MetadataAwareAspectInstanceFactory factory =
+											new PrototypeAspectInstanceFactory(this.beanFactory, beanName);
 									this.aspectFactoryCache.put(beanName, factory);
+									advisors.addAll(this.advisorFactory.getAdvisors(factory));
 								}
-								advisors.addAll(classAdvisors);
+								aspectNames.add(beanName);
 							}
-							else {
-								// Per target or per this.
-								if (this.beanFactory.isSingleton(beanName)) {
-									throw new IllegalArgumentException("Bean with name '" + beanName +
-											"' is a singleton, but aspect instantiation model is not singleton");
+							catch (IllegalArgumentException | IllegalStateException | AopConfigException ex) {
+								if (logger.isDebugEnabled()) {
+									logger.debug("Ignoring incompatible aspect [" + beanType.getName() + "]: " + ex);
 								}
-								MetadataAwareAspectInstanceFactory factory =
-										new PrototypeAspectInstanceFactory(this.beanFactory, beanName);
-								this.aspectFactoryCache.put(beanName, factory);
-								advisors.addAll(this.advisorFactory.getAdvisors(factory));
 							}
 						}
 					}

spring-aop/src/main/java/org/springframework/aop/aspectj/annotation/ReflectiveAspectJAdvisorFactory.java

@@ -213,8 +213,16 @@ public class ReflectiveAspectJAdvisorFactory extends AbstractAspectJAdvisorFacto
 			return null;
 		}
 
-		return new InstantiationModelAwarePointcutAdvisorImpl(expressionPointcut, candidateAdviceMethod,
-				this, aspectInstanceFactory, declarationOrderInAspect, aspectName);
+		try {
+			return new InstantiationModelAwarePointcutAdvisorImpl(expressionPointcut, candidateAdviceMethod,
+					this, aspectInstanceFactory, declarationOrderInAspect, aspectName);
+		}
+		catch (IllegalArgumentException | IllegalStateException ex) {
+			if (logger.isDebugEnabled()) {
+				logger.debug("Ignoring incompatible advice method: " + candidateAdviceMethod, ex);
+			}
+			return null;
+		}
 	}
 
 	@Nullable

spring-aspects/src/test/resources/org/springframework/aop/aspectj/autoproxy/ajcAutoproxyTests.xml

@@ -2,21 +2,29 @@
 <beans xmlns="http://www.springframework.org/schema/beans"
 		xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 		xmlns:aop="http://www.springframework.org/schema/aop"
+	    xmlns:cache="http://www.springframework.org/schema/cache"
 		xmlns:context="http://www.springframework.org/schema/context"
 		xsi:schemaLocation="http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans-2.0.xsd
 				http://www.springframework.org/schema/aop https://www.springframework.org/schema/aop/spring-aop-2.0.xsd
+				http://www.springframework.org/schema/cache https://www.springframework.org/schema/cache/spring-cache-3.1.xsd
 	   			http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context-2.5.xsd">
 
 	<aop:aspectj-autoproxy/>
 
 	<context:spring-configured/>
 
+	<cache:annotation-driven mode="aspectj"/>
+
+	<bean id="cacheManager" class="org.springframework.cache.support.NoOpCacheManager"/>
+
 	<bean id="myAspect" class="org.springframework.aop.aspectj.autoproxy.CodeStyleAspect" factory-method="aspectOf">
 		<property name="foo" value="bar"/>
 	</bean>
 
-	<bean id="otherBean" class="java.lang.Object"/>
+	<bean id="otherBean" class="org.springframework.beans.factory.aspectj.ShouldBeConfiguredBySpring"/>
 
-	<bean id="yetAnotherBean" class="java.lang.Object"/>
+	<bean id="yetAnotherBean" class="org.springframework.beans.factory.aspectj.ShouldBeConfiguredBySpring"/>
+
+	<bean id="configuredBean" class="org.springframework.beans.factory.aspectj.ShouldBeConfiguredBySpring" lazy-init="true"/>
 
 </beans>

spring-aspects/src/test/resources/org/springframework/cache/config/annotation-jcache-aspectj.xml

@@ -24,8 +24,7 @@
 		</property>
 	</bean>
 
-	<bean id="defaultCache"
-		  class="org.springframework.cache.concurrent.ConcurrentMapCacheFactoryBean">
+	<bean id="defaultCache" class="org.springframework.cache.concurrent.ConcurrentMapCacheFactoryBean">
 		<property name="name" value="default"/>
 	</bean>
 

spring-aspects/src/test/resources/org/springframework/scheduling/aspectj/annotationDrivenContext.xml

@@ -7,12 +7,10 @@
 				http://www.springframework.org/schema/task
 				https://www.springframework.org/schema/task/spring-task.xsd">
 
-	<task:annotation-driven mode="aspectj" executor="testExecutor"
-							exception-handler="testExceptionHandler"/>
+	<task:annotation-driven mode="aspectj" executor="testExecutor" exception-handler="testExceptionHandler"/>
 
 	<task:executor id="testExecutor"/>
 
-	<bean id="testExceptionHandler"
-		  class="org.springframework.aop.interceptor.SimpleAsyncUncaughtExceptionHandler"/>
+	<bean id="testExceptionHandler" class="org.springframework.aop.interceptor.SimpleAsyncUncaughtExceptionHandler"/>
 
 </beans>

spring-beans/src/test/java/org/springframework/beans/BeanUtilsTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 the original author or authors.
+ * Copyright 2002-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -42,6 +42,8 @@ import org.springframework.beans.propertyeditors.CustomDateEditor;
 import org.springframework.beans.testfixture.beans.DerivedTestBean;
 import org.springframework.beans.testfixture.beans.ITestBean;
 import org.springframework.beans.testfixture.beans.TestBean;
+import org.springframework.cglib.proxy.Enhancer;
+import org.springframework.cglib.proxy.MethodInterceptor;
 import org.springframework.core.io.Resource;
 import org.springframework.core.io.ResourceEditor;
 import org.springframework.lang.Nullable;
@@ -52,7 +54,7 @@ import static org.assertj.core.api.Assertions.assertThatIllegalArgumentException
 import static org.assertj.core.api.SoftAssertions.assertSoftly;
 
 /**
- * Unit tests for {@link BeanUtils}.
+ * Tests for {@link BeanUtils}.
  *
  * @author Juergen Hoeller
  * @author Rob Harrop
@@ -136,7 +138,7 @@ class BeanUtilsTests {
 		PropertyDescriptor[] actual = Introspector.getBeanInfo(TestBean.class).getPropertyDescriptors();
 		PropertyDescriptor[] descriptors = BeanUtils.getPropertyDescriptors(TestBean.class);
 		assertThat(descriptors).as("Descriptors should not be null").isNotNull();
-		assertThat(descriptors.length).as("Invalid number of descriptors returned").isEqualTo(actual.length);
+		assertThat(descriptors).as("Invalid number of descriptors returned").hasSameSizeAs(actual);
 	}
 
 	@Test
@@ -162,13 +164,13 @@ class BeanUtilsTests {
 		tb.setAge(32);
 		tb.setTouchy("touchy");
 		TestBean tb2 = new TestBean();
-		assertThat(tb2.getName() == null).as("Name empty").isTrue();
-		assertThat(tb2.getAge() == 0).as("Age empty").isTrue();
-		assertThat(tb2.getTouchy() == null).as("Touchy empty").isTrue();
+		assertThat(tb2.getName()).as("Name empty").isNull();
+		assertThat(tb2.getAge()).as("Age empty").isEqualTo(0);
+		assertThat(tb2.getTouchy()).as("Touchy empty").isNull();
 		BeanUtils.copyProperties(tb, tb2);
-		assertThat(tb2.getName().equals(tb.getName())).as("Name copied").isTrue();
-		assertThat(tb2.getAge() == tb.getAge()).as("Age copied").isTrue();
-		assertThat(tb2.getTouchy().equals(tb.getTouchy())).as("Touchy copied").isTrue();
+		assertThat(tb2.getName()).as("Name copied").isEqualTo(tb.getName());
+		assertThat(tb2.getAge()).as("Age copied").isEqualTo(tb.getAge());
+		assertThat(tb2.getTouchy()).as("Touchy copied").isEqualTo(tb.getTouchy());
 	}
 
 	@Test
@@ -178,13 +180,13 @@ class BeanUtilsTests {
 		tb.setAge(32);
 		tb.setTouchy("touchy");
 		TestBean tb2 = new TestBean();
-		assertThat(tb2.getName() == null).as("Name empty").isTrue();
-		assertThat(tb2.getAge() == 0).as("Age empty").isTrue();
-		assertThat(tb2.getTouchy() == null).as("Touchy empty").isTrue();
+		assertThat(tb2.getName()).as("Name empty").isNull();
+		assertThat(tb2.getAge()).as("Age empty").isEqualTo(0);
+		assertThat(tb2.getTouchy()).as("Touchy empty").isNull();
 		BeanUtils.copyProperties(tb, tb2);
-		assertThat(tb2.getName().equals(tb.getName())).as("Name copied").isTrue();
-		assertThat(tb2.getAge() == tb.getAge()).as("Age copied").isTrue();
-		assertThat(tb2.getTouchy().equals(tb.getTouchy())).as("Touchy copied").isTrue();
+		assertThat(tb2.getName()).as("Name copied").isEqualTo(tb.getName());
+		assertThat(tb2.getAge()).as("Age copied").isEqualTo(tb.getAge());
+		assertThat(tb2.getTouchy()).as("Touchy copied").isEqualTo(tb.getTouchy());
 	}
 
 	@Test
@@ -194,13 +196,13 @@ class BeanUtilsTests {
 		tb.setAge(32);
 		tb.setTouchy("touchy");
 		DerivedTestBean tb2 = new DerivedTestBean();
-		assertThat(tb2.getName() == null).as("Name empty").isTrue();
-		assertThat(tb2.getAge() == 0).as("Age empty").isTrue();
-		assertThat(tb2.getTouchy() == null).as("Touchy empty").isTrue();
+		assertThat(tb2.getName()).as("Name empty").isNull();
+		assertThat(tb2.getAge()).as("Age empty").isEqualTo(0);
+		assertThat(tb2.getTouchy()).as("Touchy empty").isNull();
 		BeanUtils.copyProperties(tb, tb2);
-		assertThat(tb2.getName().equals(tb.getName())).as("Name copied").isTrue();
-		assertThat(tb2.getAge() == tb.getAge()).as("Age copied").isTrue();
-		assertThat(tb2.getTouchy().equals(tb.getTouchy())).as("Touchy copied").isTrue();
+		assertThat(tb2.getName()).as("Name copied").isEqualTo(tb.getName());
+		assertThat(tb2.getAge()).as("Age copied").isEqualTo(tb.getAge());
+		assertThat(tb2.getTouchy()).as("Touchy copied").isEqualTo(tb.getTouchy());
 	}
 
 	/**
@@ -227,8 +229,8 @@ class BeanUtilsTests {
 		IntegerListHolder2 integerListHolder2 = new IntegerListHolder2();
 
 		BeanUtils.copyProperties(integerListHolder1, integerListHolder2);
-		assertThat(integerListHolder1.getList()).containsOnly(42);
-		assertThat(integerListHolder2.getList()).containsOnly(42);
+		assertThat(integerListHolder1.getList()).containsExactly(42);
+		assertThat(integerListHolder2.getList()).containsExactly(42);
 	}
 
 	/**
@@ -257,7 +259,7 @@ class BeanUtilsTests {
 		WildcardListHolder2 wildcardListHolder2 = new WildcardListHolder2();
 
 		BeanUtils.copyProperties(integerListHolder1, wildcardListHolder2);
-		assertThat(integerListHolder1.getList()).containsOnly(42);
+		assertThat(integerListHolder1.getList()).containsExactly(42);
 		assertThat(wildcardListHolder2.getList()).isEqualTo(Arrays.asList(42));
 	}
 
@@ -271,9 +273,8 @@ class BeanUtilsTests {
 		NumberUpperBoundedWildcardListHolder numberListHolder = new NumberUpperBoundedWildcardListHolder();
 
 		BeanUtils.copyProperties(integerListHolder1, numberListHolder);
-		assertThat(integerListHolder1.getList()).containsOnly(42);
-		assertThat(numberListHolder.getList()).hasSize(1);
-		assertThat(numberListHolder.getList().contains(Integer.valueOf(42))).isTrue();
+		assertThat(integerListHolder1.getList()).containsExactly(42);
+		assertThat(numberListHolder.getList()).isEqualTo(Arrays.asList(42));
 	}
 
 	/**
@@ -282,7 +283,7 @@ class BeanUtilsTests {
 	@Test
 	void copyPropertiesDoesNotCopyFromSuperTypeToSubType() {
 		NumberHolder numberHolder = new NumberHolder();
-		numberHolder.setNumber(Integer.valueOf(42));
+		numberHolder.setNumber(42);
 		IntegerHolder integerHolder = new IntegerHolder();
 
 		BeanUtils.copyProperties(numberHolder, integerHolder);
@@ -300,7 +301,7 @@ class BeanUtilsTests {
 		LongListHolder longListHolder = new LongListHolder();
 
 		BeanUtils.copyProperties(integerListHolder, longListHolder);
-		assertThat(integerListHolder.getList()).containsOnly(42);
+		assertThat(integerListHolder.getList()).containsExactly(42);
 		assertThat(longListHolder.getList()).isEmpty();
 	}
 
@@ -314,7 +315,7 @@ class BeanUtilsTests {
 		NumberListHolder numberListHolder = new NumberListHolder();
 
 		BeanUtils.copyProperties(integerListHolder, numberListHolder);
-		assertThat(integerListHolder.getList()).containsOnly(42);
+		assertThat(integerListHolder.getList()).containsExactly(42);
 		assertThat(numberListHolder.getList()).isEmpty();
 	}
 
@@ -323,12 +324,13 @@ class BeanUtilsTests {
 		Order original = new Order("test", Arrays.asList("foo", "bar"));
 
 		// Create a Proxy that loses the generic type information for the getLineItems() method.
-		OrderSummary proxy = proxyOrder(original);
+		OrderSummary proxy = (OrderSummary) Proxy.newProxyInstance(getClass().getClassLoader(),
+				new Class<?>[] {OrderSummary.class}, new OrderInvocationHandler(original));
 		assertThat(OrderSummary.class.getDeclaredMethod("getLineItems").toGenericString())
-			.contains("java.util.List<java.lang.String>");
+				.contains("java.util.List<java.lang.String>");
 		assertThat(proxy.getClass().getDeclaredMethod("getLineItems").toGenericString())
-			.contains("java.util.List")
-			.doesNotContain("<java.lang.String>");
+				.contains("java.util.List")
+				.doesNotContain("<java.lang.String>");
 
 		// Ensure that our custom Proxy works as expected.
 		assertThat(proxy.getId()).isEqualTo("test");
@@ -341,40 +343,57 @@ class BeanUtilsTests {
 		assertThat(target.getLineItems()).containsExactly("foo", "bar");
 	}
 
+	@Test  // gh-32888
+	public void copyPropertiesWithGenericCglibClass() {
+		Enhancer enhancer = new Enhancer();
+		enhancer.setSuperclass(User.class);
+		enhancer.setCallback((MethodInterceptor) (obj, method, args, proxy) -> proxy.invokeSuper(obj, args));
+		User user = (User) enhancer.create();
+		user.setId(1);
+		user.setName("proxy");
+		user.setAddress("addr");
+
+		User target = new User();
+		BeanUtils.copyProperties(user, target);
+		assertThat(target.getId()).isEqualTo(user.getId());
+		assertThat(target.getName()).isEqualTo(user.getName());
+		assertThat(target.getAddress()).isEqualTo(user.getAddress());
+	}
+
 	@Test
 	void copyPropertiesWithEditable() throws Exception {
 		TestBean tb = new TestBean();
-		assertThat(tb.getName() == null).as("Name empty").isTrue();
+		assertThat(tb.getName()).as("Name empty").isNull();
 		tb.setAge(32);
 		tb.setTouchy("bla");
 		TestBean tb2 = new TestBean();
 		tb2.setName("rod");
-		assertThat(tb2.getAge() == 0).as("Age empty").isTrue();
-		assertThat(tb2.getTouchy() == null).as("Touchy empty").isTrue();
+		assertThat(tb2.getAge()).as("Age empty").isEqualTo(0);
+		assertThat(tb2.getTouchy()).as("Touchy empty").isNull();
 
 		// "touchy" should not be copied: it's not defined in ITestBean
 		BeanUtils.copyProperties(tb, tb2, ITestBean.class);
-		assertThat(tb2.getName() == null).as("Name copied").isTrue();
-		assertThat(tb2.getAge() == 32).as("Age copied").isTrue();
-		assertThat(tb2.getTouchy() == null).as("Touchy still empty").isTrue();
+		assertThat(tb2.getName()).as("Name copied").isNull();
+		assertThat(tb2.getAge()).as("Age copied").isEqualTo(32);
+		assertThat(tb2.getTouchy()).as("Touchy still empty").isNull();
 	}
 
 	@Test
 	void copyPropertiesWithIgnore() throws Exception {
 		TestBean tb = new TestBean();
-		assertThat(tb.getName() == null).as("Name empty").isTrue();
+		assertThat(tb.getName()).as("Name empty").isNull();
 		tb.setAge(32);
 		tb.setTouchy("bla");
 		TestBean tb2 = new TestBean();
 		tb2.setName("rod");
-		assertThat(tb2.getAge() == 0).as("Age empty").isTrue();
-		assertThat(tb2.getTouchy() == null).as("Touchy empty").isTrue();
+		assertThat(tb2.getAge()).as("Age empty").isEqualTo(0);
+		assertThat(tb2.getTouchy()).as("Touchy empty").isNull();
 
 		// "spouse", "touchy", "age" should not be copied
 		BeanUtils.copyProperties(tb, tb2, "spouse", "touchy", "age");
-		assertThat(tb2.getName() == null).as("Name copied").isTrue();
-		assertThat(tb2.getAge() == 0).as("Age still empty").isTrue();
-		assertThat(tb2.getTouchy() == null).as("Touchy still empty").isTrue();
+		assertThat(tb2.getName()).as("Name copied").isNull();
+		assertThat(tb2.getAge()).as("Age still empty").isEqualTo(0);
+		assertThat(tb2.getTouchy()).as("Touchy still empty").isNull();
 	}
 
 	@Test
@@ -383,7 +402,7 @@ class BeanUtilsTests {
 		source.setName("name");
 		TestBean target = new TestBean();
 		BeanUtils.copyProperties(source, target, "specialProperty");
-		assertThat("name").isEqualTo(target.getName());
+		assertThat(target.getName()).isEqualTo("name");
 	}
 
 	@Test
@@ -520,6 +539,7 @@ class BeanUtilsTests {
 		}
 	}
 
+
 	@SuppressWarnings("unused")
 	private static class IntegerHolder {
 
@@ -534,6 +554,7 @@ class BeanUtilsTests {
 		}
 	}
 
+
 	@SuppressWarnings("unused")
 	private static class WildcardListHolder1 {
 
@@ -548,6 +569,7 @@ class BeanUtilsTests {
 		}
 	}
 
+
 	@SuppressWarnings("unused")
 	private static class WildcardListHolder2 {
 
@@ -562,6 +584,7 @@ class BeanUtilsTests {
 		}
 	}
 
+
 	@SuppressWarnings("unused")
 	private static class NumberUpperBoundedWildcardListHolder {
 
@@ -576,6 +599,7 @@ class BeanUtilsTests {
 		}
 	}
 
+
 	@SuppressWarnings("unused")
 	private static class NumberListHolder {
 
@@ -590,6 +614,7 @@ class BeanUtilsTests {
 		}
 	}
 
+
 	@SuppressWarnings("unused")
 	private static class IntegerListHolder1 {
 
@@ -604,6 +629,7 @@ class BeanUtilsTests {
 		}
 	}
 
+
 	@SuppressWarnings("unused")
 	private static class IntegerListHolder2 {
 
@@ -618,6 +644,7 @@ class BeanUtilsTests {
 		}
 	}
 
+
 	@SuppressWarnings("unused")
 	private static class LongListHolder {
 
@@ -798,6 +825,7 @@ class BeanUtilsTests {
 		}
 	}
 
+
 	private static class BeanWithNullableTypes {
 
 		private Integer counter;
@@ -828,6 +856,7 @@ class BeanUtilsTests {
 		}
 	}
 
+
 	private static class BeanWithPrimitiveTypes {
 
 		private boolean flag;
@@ -840,7 +869,6 @@ class BeanUtilsTests {
 		private char character;
 		private String text;
 
-
 		@SuppressWarnings("unused")
 		public BeanWithPrimitiveTypes(boolean flag, byte byteCount, short shortCount, int intCount, long longCount,
 				float floatCount, double doubleCount, char character, String text) {
@@ -891,21 +919,22 @@ class BeanUtilsTests {
 		public String getText() {
 			return text;
 		}
-
 	}
 
+
 	private static class PrivateBeanWithPrivateConstructor {
 
 		private PrivateBeanWithPrivateConstructor() {
 		}
 	}
 
+
 	@SuppressWarnings("unused")
 	private static class Order {
 
 		private String id;
-		private List<String> lineItems;
 
+		private List<String> lineItems;
 
 		Order() {
 		}
@@ -937,6 +966,7 @@ class BeanUtilsTests {
 		}
 	}
 
+
 	private interface OrderSummary {
 
 		String getId();
@@ -945,17 +975,10 @@ class BeanUtilsTests {
 	}
 
 
-	private OrderSummary proxyOrder(Order order) {
-		return (OrderSummary) Proxy.newProxyInstance(getClass().getClassLoader(),
-			new Class<?>[] { OrderSummary.class }, new OrderInvocationHandler(order));
-	}
-
-
 	private static class OrderInvocationHandler implements InvocationHandler {
 
 		private final Order order;
 
-
 		OrderInvocationHandler(Order order) {
 			this.order = order;
 		}
@@ -973,4 +996,46 @@ class BeanUtilsTests {
 		}
 	}
 
+
+	private static class GenericBaseModel<T> {
+
+		private T id;
+
+		private String name;
+
+		public T getId() {
+			return id;
+		}
+
+		public void setId(T id) {
+			this.id = id;
+		}
+
+		public String getName() {
+			return name;
+		}
+
+		public void setName(String name) {
+			this.name = name;
+		}
+	}
+
+
+	private static class User extends GenericBaseModel<Integer> {
+
+		private String address;
+
+		public User() {
+			super();
+		}
+
+		public String getAddress() {
+			return address;
+		}
+
+		public void setAddress(String address) {
+			this.address = address;
+		}
+	}
+
 }

spring-context/src/main/java/org/springframework/context/support/DefaultLifecycleProcessor.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2023 the original author or authors.
+ * Copyright 2002-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -45,7 +45,11 @@ import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 
 /**
- * Default implementation of the {@link LifecycleProcessor} strategy.
+ * Spring's default implementation of the {@link LifecycleProcessor} strategy.
+ *
+ * <p>Provides interaction with {@link Lifecycle} and {@link SmartLifecycle} beans in
+ * groups for specific phases, on startup/shutdown as well as for explicit start/stop
+ * interactions on a {@link org.springframework.context.ConfigurableApplicationContext}.
  *
  * @author Mark Fisher
  * @author Juergen Hoeller
@@ -145,13 +149,13 @@ public class DefaultLifecycleProcessor implements LifecycleProcessor, BeanFactor
 
 		lifecycleBeans.forEach((beanName, bean) -> {
 			if (!autoStartupOnly || (bean instanceof SmartLifecycle && ((SmartLifecycle) bean).isAutoStartup())) {
-				int phase = getPhase(bean);
-				phases.computeIfAbsent(
-						phase,
-						p -> new LifecycleGroup(phase, this.timeoutPerShutdownPhase, lifecycleBeans, autoStartupOnly)
+				int startupPhase = getPhase(bean);
+				phases.computeIfAbsent(startupPhase,
+						phase -> new LifecycleGroup(phase, this.timeoutPerShutdownPhase, lifecycleBeans, autoStartupOnly)
 				).add(beanName, bean);
 			}
 		});
+
 		if (!phases.isEmpty()) {
 			phases.values().forEach(LifecycleGroup::start);
 		}
@@ -191,6 +195,7 @@ public class DefaultLifecycleProcessor implements LifecycleProcessor, BeanFactor
 	private void stopBeans() {
 		Map<String, Lifecycle> lifecycleBeans = getLifecycleBeans();
 		Map<Integer, LifecycleGroup> phases = new HashMap<>();
+
 		lifecycleBeans.forEach((beanName, bean) -> {
 			int shutdownPhase = getPhase(bean);
 			LifecycleGroup group = phases.get(shutdownPhase);
@@ -200,6 +205,7 @@ public class DefaultLifecycleProcessor implements LifecycleProcessor, BeanFactor
 			}
 			group.add(beanName, bean);
 		});
+
 		if (!phases.isEmpty()) {
 			List<Integer> keys = new ArrayList<>(phases.keySet());
 			keys.sort(Collections.reverseOrder());
@@ -314,6 +320,8 @@ public class DefaultLifecycleProcessor implements LifecycleProcessor, BeanFactor
 	/**
 	 * Helper class for maintaining a group of Lifecycle beans that should be started
 	 * and stopped together based on their 'phase' value (or the default value of 0).
+	 * The group is expected to be created in an ad-hoc fashion and group members are
+	 * expected to always have the same 'phase' value.
 	 */
 	private class LifecycleGroup {
 

spring-core/src/main/java/org/springframework/core/BridgeMethodResolver.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 the original author or authors.
+ * Copyright 2002-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -57,11 +57,11 @@ public final class BridgeMethodResolver {
 
 
 	/**
-	 * Find the original method for the supplied {@link Method bridge Method}.
+	 * Find the local original method for the supplied {@link Method bridge Method}.
 	 * <p>It is safe to call this method passing in a non-bridge {@link Method} instance.
 	 * In such a case, the supplied {@link Method} instance is returned directly to the caller.
 	 * Callers are <strong>not</strong> required to check for bridging before calling this method.
-	 * @param bridgeMethod the method to introspect
+	 * @param bridgeMethod the method to introspect against its declaring class
 	 * @return the original method (either the bridged method or the passed-in method
 	 * if no more specific one could be found)
 	 */
@@ -73,8 +73,7 @@ public final class BridgeMethodResolver {
 		if (bridgedMethod == null) {
 			// Gather all methods with matching name and parameter size.
 			List<Method> candidateMethods = new ArrayList<>();
-			MethodFilter filter = candidateMethod ->
-					isBridgedCandidateFor(candidateMethod, bridgeMethod);
+			MethodFilter filter = (candidateMethod -> isBridgedCandidateFor(candidateMethod, bridgeMethod));
 			ReflectionUtils.doWithMethods(bridgeMethod.getDeclaringClass(), candidateMethods::add, filter);
 			if (!candidateMethods.isEmpty()) {
 				bridgedMethod = candidateMethods.size() == 1 ?
@@ -95,10 +94,10 @@ public final class BridgeMethodResolver {
 	 * Returns {@code true} if the supplied '{@code candidateMethod}' can be
 	 * considered a valid candidate for the {@link Method} that is {@link Method#isBridge() bridged}
 	 * by the supplied {@link Method bridge Method}. This method performs inexpensive
-	 * checks and can be used quickly to filter for a set of possible matches.
+	 * checks and can be used to quickly filter for a set of possible matches.
 	 */
 	private static boolean isBridgedCandidateFor(Method candidateMethod, Method bridgeMethod) {
-		return (!candidateMethod.isBridge() && !candidateMethod.equals(bridgeMethod) &&
+		return (!candidateMethod.isBridge() &&
 				candidateMethod.getName().equals(bridgeMethod.getName()) &&
 				candidateMethod.getParameterCount() == bridgeMethod.getParameterCount());
 	}
@@ -121,8 +120,8 @@ public final class BridgeMethodResolver {
 				return candidateMethod;
 			}
 			else if (previousMethod != null) {
-				sameSig = sameSig &&
-						Arrays.equals(candidateMethod.getGenericParameterTypes(), previousMethod.getGenericParameterTypes());
+				sameSig = sameSig && Arrays.equals(
+						candidateMethod.getGenericParameterTypes(), previousMethod.getGenericParameterTypes());
 			}
 			previousMethod = candidateMethod;
 		}
@@ -163,7 +162,8 @@ public final class BridgeMethodResolver {
 				}
 			}
 			// A non-array type: compare the type itself.
-			if (!ClassUtils.resolvePrimitiveIfNecessary(candidateParameter).equals(ClassUtils.resolvePrimitiveIfNecessary(genericParameter.toClass()))) {
+			if (!ClassUtils.resolvePrimitiveIfNecessary(candidateParameter).equals(
+					ClassUtils.resolvePrimitiveIfNecessary(genericParameter.toClass()))) {
 				return false;
 			}
 		}
@@ -226,8 +226,8 @@ public final class BridgeMethodResolver {
 	/**
 	 * Compare the signatures of the bridge method and the method which it bridges. If
 	 * the parameter and return types are the same, it is a 'visibility' bridge method
-	 * introduced in Java 6 to fix https://bugs.openjdk.org/browse/JDK-6342411.
-	 * See also https://stas-blogspot.blogspot.com/2010/03/java-bridge-methods-explained.html
+	 * introduced in Java 6 to fix <a href="https://bugs.openjdk.org/browse/JDK-6342411">
+	 * JDK-6342411</a>.
 	 * @return whether signatures match as described
 	 */
 	public static boolean isVisibilityBridgeMethodPair(Method bridgeMethod, Method bridgedMethod) {

spring-core/src/main/java/org/springframework/core/annotation/AnnotationUtils.java

@@ -1052,16 +1052,16 @@ public abstract class AnnotationUtils {
 			return null;
 		}
 		try {
-			Method method = annotation.annotationType().getDeclaredMethod(attributeName);
-			return invokeAnnotationMethod(method, annotation);
-		}
-		catch (NoSuchMethodException ex) {
-			return null;
+			for (Method method : annotation.annotationType().getDeclaredMethods()) {
+				if (method.getName().equals(attributeName) && method.getParameterCount() == 0) {
+					return invokeAnnotationMethod(method, annotation);
+				}
+			}
 		}
 		catch (Throwable ex) {
 			handleValueRetrievalFailure(annotation, ex);
-			return null;
 		}
+		return null;
 	}
 
 	/**

spring-expression/src/main/java/org/springframework/expression/spel/ast/Indexer.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2023 the original author or authors.
+ * Copyright 2002-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -226,6 +226,8 @@ public class Indexer extends SpelNodeImpl {
 			cf.loadTarget(mv);
 		}
 
+		SpelNodeImpl index = this.children[0];
+
 		if (this.indexedType == IndexedType.ARRAY) {
 			int insn;
 			if ("D".equals(this.exitTypeDescriptor)) {
@@ -262,18 +264,14 @@ public class Indexer extends SpelNodeImpl {
 						//depthPlusOne(exitTypeDescriptor)+"Ljava/lang/Object;");
 				insn = AALOAD;
 			}
-			SpelNodeImpl index = this.children[0];
-			cf.enterCompilationScope();
-			index.generateCode(mv, cf);
-			cf.exitCompilationScope();
+
+			generateIndexCode(mv, cf, index, int.class);
 			mv.visitInsn(insn);
 		}
 
 		else if (this.indexedType == IndexedType.LIST) {
 			mv.visitTypeInsn(CHECKCAST, "java/util/List");
-			cf.enterCompilationScope();
-			this.children[0].generateCode(mv, cf);
-			cf.exitCompilationScope();
+			generateIndexCode(mv, cf, index, int.class);
 			mv.visitMethodInsn(INVOKEINTERFACE, "java/util/List", "get", "(I)Ljava/lang/Object;", true);
 		}
 
@@ -281,15 +279,13 @@ public class Indexer extends SpelNodeImpl {
 			mv.visitTypeInsn(CHECKCAST, "java/util/Map");
 			// Special case when the key is an unquoted string literal that will be parsed as
 			// a property/field reference
-			if ((this.children[0] instanceof PropertyOrFieldReference)) {
+			if (index instanceof PropertyOrFieldReference) {
 				PropertyOrFieldReference reference = (PropertyOrFieldReference) this.children[0];
 				String mapKeyName = reference.getName();
 				mv.visitLdcInsn(mapKeyName);
 			}
 			else {
-				cf.enterCompilationScope();
-				this.children[0].generateCode(mv, cf);
-				cf.exitCompilationScope();
+				generateIndexCode(mv, cf, index, Object.class);
 			}
 			mv.visitMethodInsn(
 					INVOKEINTERFACE, "java/util/Map", "get", "(Ljava/lang/Object;)Ljava/lang/Object;", true);
@@ -325,6 +321,11 @@ public class Indexer extends SpelNodeImpl {
 		cf.pushDescriptor(this.exitTypeDescriptor);
 	}
 
+	private void generateIndexCode(MethodVisitor mv, CodeFlow cf, SpelNodeImpl indexNode, Class<?> indexType) {
+		String indexDesc = CodeFlow.toDescriptor(indexType);
+		generateCodeForArgument(mv, cf, indexNode, indexDesc);
+	}
+
 	@Override
 	public String toStringAST() {
 		StringJoiner sj = new StringJoiner(",", "[", "]");

spring-expression/src/test/java/org/springframework/expression/spel/SpelCompilationCoverageTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 the original author or authors.
+ * Copyright 2002-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -20,6 +20,8 @@ import java.io.IOException;
 import java.lang.reflect.Field;
 import java.lang.reflect.Method;
 import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.HashSet;
@@ -27,7 +29,10 @@ import java.util.List;
 import java.util.Map;
 import java.util.Set;
 import java.util.StringTokenizer;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
 
+import org.junit.jupiter.api.Nested;
 import org.junit.jupiter.api.Test;
 
 import org.springframework.asm.MethodVisitor;
@@ -55,6 +60,7 @@ import static org.assertj.core.api.InstanceOfAssertFactories.BOOLEAN;
  * Checks SpelCompiler behavior. This should cover compilation all compiled node types.
  *
  * @author Andy Clement
+ * @author Sam Brannen
  * @since 4.1
  */
 public class SpelCompilationCoverageTests extends AbstractExpressionTests {
@@ -129,6 +135,488 @@ public class SpelCompilationCoverageTests extends AbstractExpressionTests {
 	private SpelNodeImpl ast;
 
 
+	@Nested
+	class VariableReferenceTests {
+
+		@Test
+		void userDefinedVariable() {
+			EvaluationContext ctx = new StandardEvaluationContext();
+			ctx.setVariable("target", "abc");
+			expression = parser.parseExpression("#target");
+			assertThat(expression.getValue(ctx)).isEqualTo("abc");
+			assertCanCompile(expression);
+			assertThat(expression.getValue(ctx)).isEqualTo("abc");
+			ctx.setVariable("target", "123");
+			assertThat(expression.getValue(ctx)).isEqualTo("123");
+
+			// Changing the variable type from String to Integer results in a
+			// ClassCastException in the compiled code.
+			ctx.setVariable("target", 42);
+			assertThatExceptionOfType(SpelEvaluationException.class)
+				.isThrownBy(() -> expression.getValue(ctx))
+				.withCauseInstanceOf(ClassCastException.class);
+
+			ctx.setVariable("target", "abc");
+			expression = parser.parseExpression("#target.charAt(0)");
+			assertThat(expression.getValue(ctx)).isEqualTo('a');
+			assertCanCompile(expression);
+			assertThat(expression.getValue(ctx)).isEqualTo('a');
+			ctx.setVariable("target", "1");
+			assertThat(expression.getValue(ctx)).isEqualTo('1');
+
+			// Changing the variable type from String to Integer results in a
+			// ClassCastException in the compiled code.
+			ctx.setVariable("target", 42);
+			assertThatExceptionOfType(SpelEvaluationException.class)
+				.isThrownBy(() -> expression.getValue(ctx))
+				.withCauseInstanceOf(ClassCastException.class);
+		}
+
+	}
+
+	@Nested
+	class IndexingTests {
+
+		@Test
+		void indexIntoPrimitiveShortArray() {
+			short[] shorts = { (short) 33, (short) 44, (short) 55 };
+
+			expression = parser.parseExpression("[2]");
+
+			assertThat(expression.getValue(shorts)).isEqualTo((short) 55);
+			assertCanCompile(expression);
+			assertThat(expression.getValue(shorts)).isEqualTo((short) 55);
+			assertThat(getAst().getExitDescriptor()).isEqualTo("S");
+		}
+
+		@Test
+		void indexIntoPrimitiveByteArray() {
+			byte[] bytes = { (byte) 2, (byte) 3, (byte) 4 };
+
+			expression = parser.parseExpression("[2]");
+
+			assertThat(expression.getValue(bytes)).isEqualTo((byte) 4);
+			assertCanCompile(expression);
+			assertThat(expression.getValue(bytes)).isEqualTo((byte) 4);
+			assertThat(getAst().getExitDescriptor()).isEqualTo("B");
+		}
+
+		@Test
+		void indexIntoPrimitiveIntArray() {
+			int[] ints = { 8, 9, 10 };
+
+			expression = parser.parseExpression("[2]");
+
+			assertThat(expression.getValue(ints)).isEqualTo(10);
+			assertCanCompile(expression);
+			assertThat(expression.getValue(ints)).isEqualTo(10);
+			assertThat(getAst().getExitDescriptor()).isEqualTo("I");
+		}
+
+		@Test
+		void indexIntoPrimitiveLongArray() {
+			long[] longs = { 2L, 3L, 4L };
+
+			expression = parser.parseExpression("[0]");
+
+			assertThat(expression.getValue(longs)).isEqualTo(2L);
+			assertCanCompile(expression);
+			assertThat(expression.getValue(longs)).isEqualTo(2L);
+			assertThat(getAst().getExitDescriptor()).isEqualTo("J");
+		}
+
+		@Test
+		void indexIntoPrimitiveFloatArray() {
+			float[] floats = { 6.0f, 7.0f, 8.0f };
+
+			expression = parser.parseExpression("[0]");
+
+			assertThat(expression.getValue(floats)).isEqualTo(6.0f);
+			assertCanCompile(expression);
+			assertThat(expression.getValue(floats)).isEqualTo(6.0f);
+			assertThat(getAst().getExitDescriptor()).isEqualTo("F");
+		}
+
+		@Test
+		void indexIntoPrimitiveDoubleArray() {
+			double[] doubles = { 3.0d, 4.0d, 5.0d };
+
+			expression = parser.parseExpression("[1]");
+
+			assertThat(expression.getValue(doubles)).isEqualTo(4.0d);
+			assertCanCompile(expression);
+			assertThat(expression.getValue(doubles)).isEqualTo(4.0d);
+			assertThat(getAst().getExitDescriptor()).isEqualTo("D");
+		}
+
+		@Test
+		void indexIntoPrimitiveCharArray() {
+			char[] chars = { 'a', 'b', 'c' };
+
+			expression = parser.parseExpression("[1]");
+
+			assertThat(expression.getValue(chars)).isEqualTo('b');
+			assertCanCompile(expression);
+			assertThat(expression.getValue(chars)).isEqualTo('b');
+			assertThat(getAst().getExitDescriptor()).isEqualTo("C");
+		}
+
+		@Test
+		void indexIntoStringArray() {
+			String[] strings = { "a", "b", "c" };
+
+			expression = parser.parseExpression("[0]");
+
+			assertThat(expression.getValue(strings)).isEqualTo("a");
+			assertCanCompile(expression);
+			assertThat(expression.getValue(strings)).isEqualTo("a");
+			assertThat(getAst().getExitDescriptor()).isEqualTo("Ljava/lang/String");
+		}
+
+		@Test
+		void indexIntoNumberArray() {
+			Number[] numbers = { 2, 8, 9 };
+
+			expression = parser.parseExpression("[1]");
+
+			assertThat(expression.getValue(numbers)).isEqualTo(8);
+			assertCanCompile(expression);
+			assertThat(expression.getValue(numbers)).isEqualTo(8);
+			assertThat(getAst().getExitDescriptor()).isEqualTo("Ljava/lang/Number");
+		}
+
+		@Test
+		void indexInto2DPrimitiveIntArray() {
+			int[][] array = new int[][] {
+				{ 1, 2, 3 },
+				{ 4, 5, 6 }
+			};
+
+			expression = parser.parseExpression("[1]");
+
+			assertThat(stringify(expression.getValue(array))).isEqualTo("4 5 6");
+			assertCanCompile(expression);
+			assertThat(stringify(expression.getValue(array))).isEqualTo("4 5 6");
+			assertThat(getAst().getExitDescriptor()).isEqualTo("[I");
+
+			expression = parser.parseExpression("[1][2]");
+
+			assertThat(stringify(expression.getValue(array))).isEqualTo("6");
+			assertCanCompile(expression);
+			assertThat(stringify(expression.getValue(array))).isEqualTo("6");
+			assertThat(getAst().getExitDescriptor()).isEqualTo("I");
+		}
+
+		@Test
+		void indexInto2DStringArray() {
+			String[][] array = new String[][] {
+				{ "a", "b", "c" },
+				{ "d", "e", "f" }
+			};
+
+			expression = parser.parseExpression("[1]");
+
+			assertThat(stringify(expression.getValue(array))).isEqualTo("d e f");
+			assertCanCompile(expression);
+			assertThat(getAst().getExitDescriptor()).isEqualTo("[Ljava/lang/String");
+			assertThat(stringify(expression.getValue(array))).isEqualTo("d e f");
+			assertThat(getAst().getExitDescriptor()).isEqualTo("[Ljava/lang/String");
+
+			expression = parser.parseExpression("[1][2]");
+
+			assertThat(stringify(expression.getValue(array))).isEqualTo("f");
+			assertCanCompile(expression);
+			assertThat(stringify(expression.getValue(array))).isEqualTo("f");
+			assertThat(getAst().getExitDescriptor()).isEqualTo("Ljava/lang/String");
+		}
+
+		@Test
+		@SuppressWarnings("unchecked")
+		void indexIntoArrayOfListOfString() {
+			List<String>[] array = new List[] {
+				Arrays.asList("a", "b", "c"),
+				Arrays.asList("d", "e", "f")
+			};
+
+			expression = parser.parseExpression("[1]");
+
+			assertThat(stringify(expression.getValue(array))).isEqualTo("d e f");
+			assertCanCompile(expression);
+			assertThat(stringify(expression.getValue(array))).isEqualTo("d e f");
+			assertThat(getAst().getExitDescriptor()).isEqualTo("Ljava/util/List");
+
+			expression = parser.parseExpression("[1][2]");
+
+			assertThat(stringify(expression.getValue(array))).isEqualTo("f");
+			assertCanCompile(expression);
+			assertThat(stringify(expression.getValue(array))).isEqualTo("f");
+			assertThat(getAst().getExitDescriptor()).isEqualTo("Ljava/lang/Object");
+		}
+
+		@Test
+		@SuppressWarnings("unchecked")
+		void indexIntoArrayOfMap() {
+			Map<String, String>[] array = new Map[] { Collections.singletonMap("key", "value1") };
+
+			expression = parser.parseExpression("[0]");
+
+			assertThat(stringify(expression.getValue(array))).isEqualTo("{key=value1}");
+			assertCanCompile(expression);
+			assertThat(getAst().getExitDescriptor()).isEqualTo("Ljava/util/Map");
+			assertThat(stringify(expression.getValue(array))).isEqualTo("{key=value1}");
+			assertThat(getAst().getExitDescriptor()).isEqualTo("Ljava/util/Map");
+
+			expression = parser.parseExpression("[0]['key']");
+
+			assertThat(stringify(expression.getValue(array))).isEqualTo("value1");
+			assertCanCompile(expression);
+			assertThat(stringify(expression.getValue(array))).isEqualTo("value1");
+			assertThat(getAst().getExitDescriptor()).isEqualTo("Ljava/lang/Object");
+		}
+
+		@Test
+		void indexIntoListOfString() {
+			List<String> list = Arrays.asList("aaa", "bbb", "ccc");
+
+			expression = parser.parseExpression("[1]");
+
+			assertThat(expression.getValue(list)).isEqualTo("bbb");
+			assertCanCompile(expression);
+			assertThat(expression.getValue(list)).isEqualTo("bbb");
+			assertThat(getAst().getExitDescriptor()).isEqualTo("Ljava/lang/Object");
+		}
+
+		@Test
+		void indexIntoListOfInteger() {
+			List<Integer> list = Arrays.asList(123, 456, 789);
+
+			expression = parser.parseExpression("[2]");
+
+			assertThat(expression.getValue(list)).isEqualTo(789);
+			assertCanCompile(expression);
+			assertThat(expression.getValue(list)).isEqualTo(789);
+			assertThat(getAst().getExitDescriptor()).isEqualTo("Ljava/lang/Object");
+		}
+
+		@Test
+		void indexIntoListOfStringArray() {
+			List<String[]> list = Arrays.asList(
+				new String[] { "a", "b", "c" },
+				new String[] { "d", "e", "f" }
+			);
+
+			expression = parser.parseExpression("[1]");
+
+			assertThat(stringify(expression.getValue(list))).isEqualTo("d e f");
+			assertCanCompile(expression);
+			assertThat(stringify(expression.getValue(list))).isEqualTo("d e f");
+			assertThat(getAst().getExitDescriptor()).isEqualTo("Ljava/lang/Object");
+
+			expression = parser.parseExpression("[1][0]");
+
+			assertThat(stringify(expression.getValue(list))).isEqualTo("d");
+			assertCanCompile(expression);
+			assertThat(stringify(expression.getValue(list))).isEqualTo("d");
+			assertThat(getAst().getExitDescriptor()).isEqualTo("Ljava/lang/String");
+		}
+
+		@Test
+		void indexIntoListOfIntegerArray() {
+			List<Integer[]> list = Arrays.asList(
+				new Integer[] { 1, 2, 3 },
+				new Integer[] { 4, 5, 6 }
+			);
+
+			expression = parser.parseExpression("[0]");
+
+			assertThat(stringify(expression.getValue(list))).isEqualTo("1 2 3");
+			assertCanCompile(expression);
+			assertThat(stringify(expression.getValue(list))).isEqualTo("1 2 3");
+			assertThat(getAst().getExitDescriptor()).isEqualTo("Ljava/lang/Object");
+
+			expression = parser.parseExpression("[0][1]");
+
+			assertThat(expression.getValue(list)).isEqualTo(2);
+			assertCanCompile(expression);
+			assertThat(expression.getValue(list)).isEqualTo(2);
+			assertThat(getAst().getExitDescriptor()).isEqualTo("Ljava/lang/Integer");
+		}
+
+		@Test
+		void indexIntoListOfListOfString() {
+			List<List<String>> list = Arrays.asList(
+					Arrays.asList("a", "b", "c"),
+					Arrays.asList("d", "e", "f")
+			);
+
+			expression = parser.parseExpression("[1]");
+
+			assertThat(stringify(expression.getValue(list))).isEqualTo("d e f");
+			assertCanCompile(expression);
+			assertThat(getAst().getExitDescriptor()).isEqualTo("Ljava/lang/Object");
+			assertThat(stringify(expression.getValue(list))).isEqualTo("d e f");
+			assertThat(getAst().getExitDescriptor()).isEqualTo("Ljava/lang/Object");
+
+			expression = parser.parseExpression("[1][2]");
+
+			assertThat(stringify(expression.getValue(list))).isEqualTo("f");
+			assertCanCompile(expression);
+			assertThat(stringify(expression.getValue(list))).isEqualTo("f");
+			assertThat(getAst().getExitDescriptor()).isEqualTo("Ljava/lang/Object");
+		}
+
+		@Test
+		void indexIntoMap() {
+			Map<String, Integer> map = Collections.singletonMap("aaa", 111);
+
+			expression = parser.parseExpression("['aaa']");
+
+			assertThat(expression.getValue(map)).isEqualTo(111);
+			assertCanCompile(expression);
+			assertThat(expression.getValue(map)).isEqualTo(111);
+			assertThat(getAst().getExitDescriptor()).isEqualTo("Ljava/lang/Object");
+		}
+
+		@Test
+		void indexIntoMapOfListOfString() {
+			Map<String, List<String>> map = Collections.singletonMap("foo", Arrays.asList("a", "b", "c"));
+
+			expression = parser.parseExpression("['foo']");
+
+			assertThat(stringify(expression.getValue(map))).isEqualTo("a b c");
+			assertCanCompile(expression);
+			assertThat(getAst().getExitDescriptor()).isEqualTo("Ljava/lang/Object");
+			assertThat(stringify(expression.getValue(map))).isEqualTo("a b c");
+			assertThat(getAst().getExitDescriptor()).isEqualTo("Ljava/lang/Object");
+
+			expression = parser.parseExpression("['foo'][2]");
+
+			assertThat(stringify(expression.getValue(map))).isEqualTo("c");
+			assertCanCompile(expression);
+			assertThat(stringify(expression.getValue(map))).isEqualTo("c");
+			assertThat(getAst().getExitDescriptor()).isEqualTo("Ljava/lang/Object");
+		}
+
+		@Test
+		void indexIntoObject() {
+			TestClass6 tc = new TestClass6();
+
+			// field access
+			expression = parser.parseExpression("['orange']");
+
+			assertThat(expression.getValue(tc)).isEqualTo("value1");
+			assertCanCompile(expression);
+			assertThat(expression.getValue(tc)).isEqualTo("value1");
+			assertThat(getAst().getExitDescriptor()).isEqualTo("Ljava/lang/String");
+
+			// field access
+			expression = parser.parseExpression("['peach']");
+
+			assertThat(expression.getValue(tc)).isEqualTo(34L);
+			assertCanCompile(expression);
+			assertThat(expression.getValue(tc)).isEqualTo(34L);
+			assertThat(getAst().getExitDescriptor()).isEqualTo("J");
+
+			// property access (getter)
+			expression = parser.parseExpression("['banana']");
+
+			assertThat(expression.getValue(tc)).isEqualTo("value3");
+			assertCanCompile(expression);
+			assertThat(expression.getValue(tc)).isEqualTo("value3");
+			assertThat(getAst().getExitDescriptor()).isEqualTo("Ljava/lang/String");
+		}
+
+		@Test  // gh-32694, gh-32908
+		void indexIntoArrayUsingIntegerWrapper() {
+			context.setVariable("array", new int[] {1, 2, 3, 4});
+			context.setVariable("index", 2);
+
+			expression = parser.parseExpression("#array[#index]");
+
+			assertThat(expression.getValue(context)).isEqualTo(3);
+			assertCanCompile(expression);
+			assertThat(expression.getValue(context)).isEqualTo(3);
+			assertThat(getAst().getExitDescriptor()).isEqualTo("I");
+		}
+
+		@Test  // gh-32694, gh-32908
+		void indexIntoListUsingIntegerWrapper() {
+			context.setVariable("list", Arrays.asList(1, 2, 3, 4));
+			context.setVariable("index", 2);
+
+			expression = parser.parseExpression("#list[#index]");
+
+			assertThat(expression.getValue(context)).isEqualTo(3);
+			assertCanCompile(expression);
+			assertThat(expression.getValue(context)).isEqualTo(3);
+			assertThat(getAst().getExitDescriptor()).isEqualTo("Ljava/lang/Object");
+		}
+
+		@Test  // gh-32903
+		void indexIntoMapUsingPrimitiveLiteral() {
+			Map<Object, String> map = new HashMap<>();
+			map.put(false, "0");    // BooleanLiteral
+			map.put(1, "ABC");      // IntLiteral
+			map.put(2L, "XYZ");     // LongLiteral
+			map.put(9.99F, "~10");  // FloatLiteral
+			map.put(3.14159, "PI"); // RealLiteral
+			context.setVariable("map", map);
+
+			// BooleanLiteral
+			expression = parser.parseExpression("#map[false]");
+			assertThat(expression.getValue(context)).isEqualTo("0");
+			assertCanCompile(expression);
+			assertThat(expression.getValue(context)).isEqualTo("0");
+			assertThat(getAst().getExitDescriptor()).isEqualTo("Ljava/lang/Object");
+
+			// IntLiteral
+			expression = parser.parseExpression("#map[1]");
+			assertThat(expression.getValue(context)).isEqualTo("ABC");
+			assertCanCompile(expression);
+			assertThat(expression.getValue(context)).isEqualTo("ABC");
+			assertThat(getAst().getExitDescriptor()).isEqualTo("Ljava/lang/Object");
+
+			// LongLiteral
+			expression = parser.parseExpression("#map[2L]");
+			assertThat(expression.getValue(context)).isEqualTo("XYZ");
+			assertCanCompile(expression);
+			assertThat(expression.getValue(context)).isEqualTo("XYZ");
+			assertThat(getAst().getExitDescriptor()).isEqualTo("Ljava/lang/Object");
+
+			// FloatLiteral
+			expression = parser.parseExpression("#map[9.99F]");
+			assertThat(expression.getValue(context)).isEqualTo("~10");
+			assertCanCompile(expression);
+			assertThat(expression.getValue(context)).isEqualTo("~10");
+			assertThat(getAst().getExitDescriptor()).isEqualTo("Ljava/lang/Object");
+
+			// RealLiteral
+			expression = parser.parseExpression("#map[3.14159]");
+			assertThat(expression.getValue(context)).isEqualTo("PI");
+			assertCanCompile(expression);
+			assertThat(expression.getValue(context)).isEqualTo("PI");
+			assertThat(getAst().getExitDescriptor()).isEqualTo("Ljava/lang/Object");
+		}
+
+		private String stringify(Object object) {
+			Stream<? extends Object> stream;
+			if (object instanceof Collection) {
+				stream = ((Collection<?>) object).stream();
+			}
+			else if (object instanceof Object[]) {
+				stream = Arrays.stream((Object[]) object);
+			}
+			else if (object instanceof int[]) {
+				stream = Arrays.stream((int[]) object).mapToObj(Integer::valueOf);
+			}
+			else {
+				return String.valueOf(object);
+			}
+			return stream.map(Object::toString).collect(Collectors.joining(" "));
+		}
+
+	}
+
 	@Test
 	void typeReference() {
 		expression = parse("T(String)");