Add nullability annotations to tests in module/spring-boot-jdbc-test

See gh-47263

module/spring-boot-jdbc-test/build.gradle

@@ -51,3 +51,11 @@ dependencies {
 	testRuntimeOnly("com.h2database:h2")
 	testRuntimeOnly("org.hsqldb:hsqldb")
 }
+
+tasks.named("compileTestJava") {
+	options.nullability.checking = "tests"
+}
+
+tasks.named("compileDockerTestJava") {
+	options.nullability.checking = "tests"
+}

module/spring-boot-jdbc-test/src/test/java/org/springframework/boot/jdbc/test/autoconfigure/ExampleEntity.java

@@ -16,6 +16,8 @@
 
 package org.springframework.boot.jdbc.test.autoconfigure;
 
+import org.jspecify.annotations.Nullable;
+
 /**
  * Example entity used with {@link JdbcTest @JdbcTest} tests.
  *
@@ -25,9 +27,9 @@ public class ExampleEntity {
 
 	private final int id;
 
-	private String name;
+	private @Nullable String name;
 
-	public ExampleEntity(int id, String name) {
+	public ExampleEntity(int id, @Nullable String name) {
 		this.id = id;
 		this.name = name;
 	}
@@ -40,11 +42,11 @@ public class ExampleEntity {
 		return this.id;
 	}
 
-	public String getName() {
+	public @Nullable String getName() {
 		return this.name;
 	}
 
-	public void setName(String name) {
+	public void setName(@Nullable String name) {
 		this.name = name;
 	}