Upgrade to Nullability Plugin 0.0.9

Closes gh-48638

build-plugin/spring-boot-gradle-plugin/src/test/java/org/springframework/boot/gradle/docs/GettingStartedDocumentationTests.java

@@ -31,6 +31,7 @@ import org.springframework.boot.testsupport.gradle.testkit.GradleBuild;
 @ExtendWith(GradleMultiDslExtension.class)
 class GettingStartedDocumentationTests {
 
+	@SuppressWarnings("NullAway.Init")
 	GradleBuild gradleBuild;
 
 	// NOTE: We can't run any 'apply-plugin' tests because during a release the

build-plugin/spring-boot-gradle-plugin/src/test/java/org/springframework/boot/gradle/docs/IntegratingWithActuatorDocumentationTests.java

@@ -38,6 +38,7 @@ import static org.assertj.core.api.Assertions.assertThat;
 @ExtendWith(GradleMultiDslExtension.class)
 class IntegratingWithActuatorDocumentationTests {
 
+	@SuppressWarnings("NullAway.Init")
 	GradleBuild gradleBuild;
 
 	@TestTemplate

build-plugin/spring-boot-gradle-plugin/src/test/java/org/springframework/boot/gradle/docs/ManagingDependenciesDocumentationTests.java

@@ -35,6 +35,7 @@ import static org.junit.jupiter.api.Assumptions.assumingThat;
 @ExtendWith(GradleMultiDslExtension.class)
 class ManagingDependenciesDocumentationTests {
 
+	@SuppressWarnings("NullAway.Init")
 	GradleBuild gradleBuild;
 
 	@TestTemplate

build-plugin/spring-boot-gradle-plugin/src/test/java/org/springframework/boot/gradle/docs/PackagingDocumentationTests.java

@@ -45,6 +45,7 @@ import static org.assertj.core.api.Assertions.assertThat;
 @ExtendWith(GradleMultiDslExtension.class)
 class PackagingDocumentationTests {
 
+	@SuppressWarnings("NullAway.Init")
 	GradleBuild gradleBuild;
 
 	@TestTemplate

build-plugin/spring-boot-gradle-plugin/src/test/java/org/springframework/boot/gradle/docs/PublishingDocumentationTests.java

@@ -33,6 +33,7 @@ import static org.assertj.core.api.Assertions.assertThat;
 @ExtendWith(GradleMultiDslExtension.class)
 class PublishingDocumentationTests {
 
+	@SuppressWarnings("NullAway.Init")
 	GradleBuild gradleBuild;
 
 	@TestTemplate

build-plugin/spring-boot-gradle-plugin/src/test/java/org/springframework/boot/gradle/docs/RunningDocumentationTests.java

@@ -38,6 +38,7 @@ import static org.assertj.core.api.Assertions.assertThat;
 @ExtendWith(GradleMultiDslExtension.class)
 class RunningDocumentationTests {
 
+	@SuppressWarnings("NullAway.Init")
 	GradleBuild gradleBuild;
 
 	@TestTemplate

build-plugin/spring-boot-gradle-plugin/src/test/java/org/springframework/boot/gradle/docs/package-info.java

@@ -0,0 +1,20 @@
+/*
+ * Copyright 2012-present 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.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+@NullMarked
+package org.springframework.boot.gradle.docs;
+
+import org.jspecify.annotations.NullMarked;

build-plugin/spring-boot-gradle-plugin/src/test/java/org/springframework/boot/gradle/junit/GradleBuildFieldSetter.java

@@ -22,6 +22,7 @@ import org.junit.jupiter.api.extension.BeforeEachCallback;
 import org.junit.jupiter.api.extension.ExtensionContext;
 
 import org.springframework.boot.testsupport.gradle.testkit.GradleBuild;
+import org.springframework.util.Assert;
 import org.springframework.util.ReflectionUtils;
 
 /**
@@ -41,6 +42,7 @@ final class GradleBuildFieldSetter implements BeforeEachCallback {
 	@Override
 	public void beforeEach(ExtensionContext context) throws Exception {
 		Field field = ReflectionUtils.findField(context.getRequiredTestClass(), "gradleBuild");
+		Assert.notNull(field, "Field named gradleBuild not found in " + context.getRequiredTestClass().getName());
 		field.setAccessible(true);
 		field.set(context.getRequiredTestInstance(), this.gradleBuild);
 

build-plugin/spring-boot-gradle-plugin/src/test/java/org/springframework/boot/gradle/junit/GradleProjectBuilder.java

@@ -20,6 +20,7 @@ import java.io.File;
 
 import org.gradle.api.Project;
 import org.gradle.testfixtures.ProjectBuilder;
+import org.jspecify.annotations.Nullable;
 
 import org.springframework.util.Assert;
 import org.springframework.util.StringUtils;
@@ -32,9 +33,9 @@ import org.springframework.util.StringUtils;
  */
 public final class GradleProjectBuilder {
 
-	private File projectDir;
+	private @Nullable File projectDir;
 
-	private String name;
+	private @Nullable String name;
 
 	private GradleProjectBuilder() {
 	}

build-plugin/spring-boot-gradle-plugin/src/test/java/org/springframework/boot/gradle/junit/package-info.java

@@ -0,0 +1,20 @@
+/*
+ * Copyright 2012-present 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.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+@NullMarked
+package org.springframework.boot.gradle.junit;
+
+import org.jspecify.annotations.NullMarked;

build-plugin/spring-boot-gradle-plugin/src/test/java/org/springframework/boot/gradle/package-info.java

@@ -0,0 +1,20 @@
+/*
+ * Copyright 2012-present 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.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+@NullMarked
+package org.springframework.boot.gradle;
+
+import org.jspecify.annotations.NullMarked;

build-plugin/spring-boot-gradle-plugin/src/test/java/org/springframework/boot/gradle/tasks/bundling/AbstractBootArchiveIntegrationTests.java

@@ -661,7 +661,7 @@ abstract class AbstractBootArchiveIntegrationTests {
 				"src/main/java/com/example/" + this.taskName.toLowerCase(Locale.ROOT) + "/" + name);
 		output.mkdirs();
 		FileSystemUtils.copyRecursively(
-				new File("src/test/java/com/example/" + this.taskName.toLowerCase(Locale.ENGLISH) + "/" + name),
+				new File("src/test/resources/com/example/" + this.taskName.toLowerCase(Locale.ENGLISH) + "/" + name),
 				output);
 	}
 

build-plugin/spring-boot-gradle-plugin/src/test/java/org/springframework/boot/gradle/tasks/run/BootRunIntegrationTests.java

@@ -160,7 +160,7 @@ class BootRunIntegrationTests {
 	void classesFromASecondarySourceSetCanBeOnTheClasspath() throws IOException {
 		File output = new File(this.gradleBuild.getProjectDir(), "src/secondary/java/com/example/bootrun/main");
 		output.mkdirs();
-		FileSystemUtils.copyRecursively(new File("src/test/java/com/example/bootrun/main"), output);
+		FileSystemUtils.copyRecursively(new File("src/test/resources/com/example/bootrun/main"), output);
 		BuildResult result = this.gradleBuild.build("bootRun");
 		BuildTask task = result.task(":bootRun");
 		assertThat(task).isNotNull();
@@ -203,7 +203,7 @@ class BootRunIntegrationTests {
 	private void copyApplication(String name) throws IOException {
 		File output = new File(this.gradleBuild.getProjectDir(), "src/main/java/com/example/bootrun/" + name);
 		output.mkdirs();
-		FileSystemUtils.copyRecursively(new File("src/test/java/com/example/bootrun/" + name), output);
+		FileSystemUtils.copyRecursively(new File("src/test/resources/com/example/bootrun/" + name), output);
 	}
 
 	private String canonicalPathOf(String path) throws IOException {

build-plugin/spring-boot-gradle-plugin/src/test/java/org/springframework/boot/gradle/tasks/run/BootTestRunIntegrationTests.java

@@ -162,7 +162,7 @@ class BootTestRunIntegrationTests {
 	private void copyApplication(String name) throws IOException {
 		File output = new File(this.gradleBuild.getProjectDir(), "src/test/java/com/example/boottestrun/" + name);
 		output.mkdirs();
-		FileSystemUtils.copyRecursively(new File("src/test/java/com/example/boottestrun/" + name), output);
+		FileSystemUtils.copyRecursively(new File("src/test/resources/com/example/boottestrun/" + name), output);
 	}
 
 	private String canonicalPathOf(String path) throws IOException {

build-plugin/spring-boot-gradle-plugin/src/test/java/org/springframework/boot/gradle/testkit/package-info.java

@@ -0,0 +1,20 @@
+/*
+ * Copyright 2012-present 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.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+@NullMarked
+package org.springframework.boot.gradle.testkit;
+
+import org.jspecify.annotations.NullMarked;

build-plugin/spring-boot-maven-plugin/src/test/java/org/springframework/boot/maven/sample/package-info.java

@@ -0,0 +1,23 @@
+/*
+ * Copyright 2012-present 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.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Sample code for testing the Maven plugin for Spring Boot.
+ */
+@NullMarked
+package org.springframework.boot.maven.sample;
+
+import org.jspecify.annotations.NullMarked;