Sort the contents of generated imports files

The list of class names generated by annotation processors should be
sorted before being written to `AutoConfiguration.imports` and
`ManagementContextConfiguration.imports` files to make the build more
deterministic.

See gh-31228

Author: scottfrederick

Diff for: spring-boot-project/spring-boot-tools/spring-boot-autoconfigure-processor/src/main/java/org/springframework/boot/autoconfigureprocessor/AbstractImportsAnnotationProcessor.java

@@ -21,6 +21,7 @@
 import java.io.Writer;
 import java.nio.charset.StandardCharsets;
 import java.util.ArrayList;
+import java.util.Collections;
 import java.util.List;
 import java.util.Set;
 
@@ -74,6 +75,7 @@ private void writeImportsFile() throws IOException {
 			Filer filer = this.processingEnv.getFiler();
 			FileObject file = filer.createResource(StandardLocation.CLASS_OUTPUT, "", getImportsFilePath());
 			try (Writer writer = new OutputStreamWriter(file.openOutputStream(), StandardCharsets.UTF_8)) {
+				Collections.sort(this.qualifiedClassNames);
 				for (String className : this.qualifiedClassNames) {
 					writer.append(className);
 					writer.append(System.lineSeparator());

Diff for: spring-boot-project/spring-boot-tools/spring-boot-autoconfigure-processor/src/test/java/org/springframework/boot/autoconfigureprocessor/AutoConfigurationImportsAnnotationProcessorTests.java

@@ -50,8 +50,8 @@ void createCompiler() throws IOException {
 
 	@Test
 	void annotatedClasses() throws Exception {
-		List<String> classes = compile(TestAutoConfigurationConfiguration.class,
-				TestAutoConfigurationOnlyConfiguration.class);
+		List<String> classes = compile(TestAutoConfigurationOnlyConfiguration.class,
+				TestAutoConfigurationConfiguration.class);
 		assertThat(classes).hasSize(2);
 		assertThat(classes).containsExactly(
 				"org.springframework.boot.autoconfigureprocessor.TestAutoConfigurationConfiguration",

Diff for: spring-boot-project/spring-boot-tools/spring-boot-autoconfigure-processor/src/test/java/org/springframework/boot/autoconfigureprocessor/ManagementContextConfigurationImportsAnnotationProcessorTests.java

@@ -50,8 +50,8 @@ void createCompiler() throws IOException {
 
 	@Test
 	void annotatedClasses() throws Exception {
-		List<String> classes = compile(TestManagementContextConfigurationOne.class,
-				TestManagementContextConfigurationTwo.class);
+		List<String> classes = compile(TestManagementContextConfigurationTwo.class,
+				TestManagementContextConfigurationOne.class);
 		assertThat(classes).hasSize(2);
 		assertThat(classes).containsExactly(
 				"org.springframework.boot.autoconfigureprocessor.TestManagementContextConfigurationOne",