Polish TestCompiler support

spring-core-test/src/main/java/org/springframework/aot/test/generator/compile/CompileWithTargetClassAccess.java

@@ -37,5 +37,4 @@ import org.junit.jupiter.api.extension.ExtendWith;
 @Documented
 @ExtendWith(CompileWithTargetClassAccessExtension.class)
 public @interface CompileWithTargetClassAccess {
-
 }

spring-core-test/src/main/java/org/springframework/aot/test/generator/compile/CompileWithTargetClassAccessClassLoader.java

@@ -63,6 +63,7 @@ final class CompileWithTargetClassAccessClassLoader extends ClassLoader {
 	}
 
 
+	// Invoked reflectively by DynamicClassLoader.findDefineClassMethod(ClassLoader)
 	Class<?> defineClassWithTargetAccess(String name, byte[] b, int off, int len) {
 		return super.defineClass(name, b, off, len);
 	}

spring-core-test/src/main/java/org/springframework/aot/test/generator/compile/CompileWithTargetClassAccessExtension.java

@@ -161,6 +161,7 @@ class CompileWithTargetClassAccessExtension implements InvocationInterceptor {
 	}
 
 
+	@FunctionalInterface
 	interface Action {
 
 		static Action NONE = () -> {

spring-core-test/src/main/java/org/springframework/aot/test/generator/compile/Compiled.java

@@ -36,7 +36,6 @@ import org.springframework.util.Assert;
  */
 public class Compiled {
 
-
 	private final ClassLoader classLoader;
 
 	private final SourceFiles sourceFiles;
@@ -47,8 +46,7 @@ public class Compiled {
 	private List<Class<?>> compiledClasses;
 
 
-	Compiled(ClassLoader classLoader, SourceFiles sourceFiles,
-			ResourceFiles resourceFiles) {
+	Compiled(ClassLoader classLoader, SourceFiles sourceFiles, ResourceFiles resourceFiles) {
 		this.classLoader = classLoader;
 		this.sourceFiles = sourceFiles;
 		this.resourceFiles = resourceFiles;

spring-core-test/src/main/java/org/springframework/aot/test/generator/compile/DynamicClassFileObject.java

@@ -35,8 +35,7 @@ class DynamicClassFileObject extends SimpleJavaFileObject {
 
 
 	DynamicClassFileObject(String className) {
-		super(URI.create("class:///" + className.replace('.', '/') + ".class"),
-				Kind.CLASS);
+		super(URI.create("class:///" + className.replace('.', '/') + ".class"), Kind.CLASS);
 	}
 
 

spring-core-test/src/main/java/org/springframework/aot/test/generator/compile/DynamicClassLoader.java

@@ -184,7 +184,6 @@ public class DynamicClassLoader extends ClassLoader {
 		public InputStream getInputStream() throws IOException {
 			return new ByteArrayInputStream(
 					this.file.getContent().getBytes(StandardCharsets.UTF_8));
-
 		}
 
 	}

spring-core-test/src/main/java/org/springframework/aot/test/generator/compile/TestCompiler.java

@@ -103,12 +103,11 @@ public final class TestCompiler {
 	 */
 	public TestCompiler withFiles(InMemoryGeneratedFiles generatedFiles) {
 		List<SourceFile> sourceFiles = new ArrayList<>();
-		generatedFiles.getGeneratedFiles(Kind.SOURCE).forEach((path,
-				inputStreamSource) -> sourceFiles.add(SourceFile.of(inputStreamSource)));
+		generatedFiles.getGeneratedFiles(Kind.SOURCE).forEach(
+				(path, inputStreamSource) -> sourceFiles.add(SourceFile.of(inputStreamSource)));
 		List<ResourceFile> resourceFiles = new ArrayList<>();
-		generatedFiles.getGeneratedFiles(Kind.RESOURCE)
-				.forEach((path, inputStreamSource) -> resourceFiles
-						.add(ResourceFile.of(path, inputStreamSource)));
+		generatedFiles.getGeneratedFiles(Kind.RESOURCE).forEach(
+				(path, inputStreamSource) -> resourceFiles.add(ResourceFile.of(path, inputStreamSource)));
 		return withSources(sourceFiles).withResources(resourceFiles);
 	}
 
@@ -256,7 +255,7 @@ public final class TestCompiler {
 		}
 		catch (IllegalAccessError ex) {
 			throw new IllegalAccessError(ex.getMessage() + ". " +
-					"For non-public access ensure annotate your tests with @CompileWithTargetClassAccess");
+					"For non-public access ensure you annotate your test class or test method with @CompileWithTargetClassAccess");
 		}
 		finally {
 			Thread.currentThread().setContextClassLoader(previousClassLoader);
@@ -318,12 +317,12 @@ public final class TestCompiler {
 		@Override
 		public void report(Diagnostic<? extends JavaFileObject> diagnostic) {
 			if (diagnostic.getKind() == Diagnostic.Kind.ERROR) {
-				this.message.append("\n");
+				this.message.append('\n');
 				this.message.append(diagnostic.getMessage(Locale.getDefault()));
-				this.message.append(" ");
+				this.message.append(' ');
 				this.message.append(diagnostic.getSource().getName());
-				this.message.append(" ");
-				this.message.append(diagnostic.getLineNumber()).append(":")
+				this.message.append(' ');
+				this.message.append(diagnostic.getLineNumber()).append(':')
 						.append(diagnostic.getColumnNumber());
 			}
 		}

spring-core-test/src/test/java/org/springframework/aot/test/generator/compile/TestCompilerTests.java

@@ -42,6 +42,8 @@ import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
 
 /**
  * Tests for {@link TestCompiler}.
+ *
+ * @since 6.0
  * @author Phillip Webb
  * @author Andy Wilkinson
  * @author Scott Frederick
@@ -89,6 +91,7 @@ class TestCompilerTests {
 			}
 			""";
 
+
 	@Test
 	@SuppressWarnings("unchecked")
 	void compileWhenHasDifferentClassesWithSameClassNameCompilesBoth() {