8310061: Note if implicit annotation processing is being used

Reviewed-by: vromero
Backport-of: 3df36c4f101e094d6f6beccadc004742b47d045a

src/jdk.compiler/share/classes/com/sun/tools/javac/main/Arguments.java

@@ -458,7 +458,7 @@ public boolean validate() {
 
             if (!emptyAllowed) {
                 if (!errors) {
-                    if (JavaCompiler.explicitAnnotationProcessingRequested(options)) {
+                    if (JavaCompiler.explicitAnnotationProcessingRequested(options, fileManager)) {
                         reportDiag(Errors.NoSourceFilesClasses);
                     } else {
                         reportDiag(Errors.NoSourceFiles);

src/jdk.compiler/share/classes/com/sun/tools/javac/main/JavaCompiler.java

@@ -84,7 +84,10 @@
 
 import static com.sun.tools.javac.code.Kinds.Kind.*;
 
+import com.sun.tools.javac.code.Lint;
+import com.sun.tools.javac.code.Lint.LintCategory;
 import com.sun.tools.javac.code.Symbol.ModuleSymbol;
+
 import com.sun.tools.javac.resources.CompilerProperties.Errors;
 import com.sun.tools.javac.resources.CompilerProperties.Fragments;
 import com.sun.tools.javac.resources.CompilerProperties.Notes;
@@ -96,6 +99,7 @@
 import static com.sun.tools.javac.util.JCDiagnostic.DiagnosticFlag.*;
 
 import static javax.tools.StandardLocation.CLASS_OUTPUT;
+import static javax.tools.StandardLocation.ANNOTATION_PROCESSOR_PATH;
 
 import com.sun.tools.javac.tree.JCTree.JCModuleDecl;
 import com.sun.tools.javac.tree.JCTree.JCRecordPattern;
@@ -232,6 +236,10 @@ else if (option.equals("class"))
      */
     public Log log;
 
+    /** Whether or not the options lint category was initially disabled
+     */
+    boolean optionsCheckingInitiallyDisabled;
+
     /** Factory for creating diagnostic objects
      */
     JCDiagnostic.Factory diagFactory;
@@ -424,6 +432,12 @@ public JavaCompiler(Context context) {
         moduleFinder.moduleNameFromSourceReader = this::readModuleName;
 
         options = Options.instance(context);
+        // See if lint options checking was explicitly disabled by the
+        // user; this is distinct from the options check being
+        // enabled/disabled.
+        optionsCheckingInitiallyDisabled =
+            options.isSet(Option.XLINT_CUSTOM, "-options") ||
+            options.isSet(Option.XLINT_CUSTOM, "none");
 
         verbose       = options.isSet(VERBOSE);
         sourceOutput  = options.isSet(PRINTSOURCE); // used to be -s
@@ -1132,6 +1146,11 @@ public void initProcessAnnotations(Iterable<? extends Processor> processors,
             processAnnotations = procEnvImpl.atLeastOneProcessor();
 
             if (processAnnotations) {
+                if (!explicitAnnotationProcessingRequested() &&
+                    !optionsCheckingInitiallyDisabled) {
+                    log.note(Notes.ImplicitAnnotationProcessing);
+                }
+
                 options.put("parameters", "parameters");
                 reader.saveParameterNames = true;
                 keepComments = true;
@@ -1279,18 +1298,19 @@ private boolean unrecoverableError() {
     boolean explicitAnnotationProcessingRequested() {
         return
             explicitAnnotationProcessingRequested ||
-            explicitAnnotationProcessingRequested(options);
+            explicitAnnotationProcessingRequested(options, fileManager);
     }
 
-    static boolean explicitAnnotationProcessingRequested(Options options) {
+    static boolean explicitAnnotationProcessingRequested(Options options, JavaFileManager fileManager) {
         return
             options.isSet(PROCESSOR) ||
             options.isSet(PROCESSOR_PATH) ||
             options.isSet(PROCESSOR_MODULE_PATH) ||
             options.isSet(PROC, "only") ||
             options.isSet(PROC, "full") ||
             options.isSet(A) ||
-            options.isSet(XPRINT);
+            options.isSet(XPRINT) ||
+            fileManager.hasLocation(ANNOTATION_PROCESSOR_PATH);
         // Skipping -XprintRounds and -XprintProcessorInfo
     }
 

src/jdk.compiler/share/classes/com/sun/tools/javac/processing/JavacProcessingEnvironment.java

@@ -310,6 +310,10 @@ private void initProcessorIterator(Iterable<? extends Processor> processors) {
                  * If the "-processor" option is used, search the appropriate
                  * path for the named class.  Otherwise, use a service
                  * provider mechanism to create the processor iterator.
+                 *
+                 * Note: if an explicit processor path is not set,
+                 * only the class path and _not_ the module path are
+                 * searched for processors.
                  */
                 String processorNames = options.get(Option.PROCESSOR);
                 if (fileManager.hasLocation(ANNOTATION_PROCESSOR_MODULE_PATH)) {

src/jdk.compiler/share/classes/com/sun/tools/javac/resources/compiler.properties

@@ -1769,6 +1769,15 @@ compiler.note.proc.messager=\
 compiler.note.multiple.elements=\
     Multiple elements named ''{1}'' in modules ''{2}'' were found by javax.lang.model.util.Elements.{0}.
 
+compiler.note.implicit.annotation.processing=\
+    Annotation processing is enabled because one or more processors were found\n\
+    on the class path. A future release of javac may disable annotation processing\n\
+    unless at least one processor is specified by name (-processor), or a search\n\
+    path is specified (--processor-path, --processor-module-path), or annotation\n\
+    processing is enabled explicitly (-proc:only, -proc:full).\n\
+    Use -Xlint:-options to suppress this message.\n\
+    Use -proc:none to disable annotation processing.
+
 #####
 
 # 0: number

test/langtools/tools/javac/annotations/8218152/MalformedAnnotationProcessorTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2019, 2023, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -115,7 +115,8 @@ public void testMissingAnnotationProcessor(Path base) throws Exception {
                     .options("-XDrawDiagnostics",
                              "-classpath", "",
                              "-sourcepath", src.toString(),
-                             "-processorpath", apDir.toString())
+                             "-processorpath", apDir.toString(),
+                             "-Xlint:-options")
                     .outdir(classes)
                     .files(tb.findJavaFiles(src))
                     .run(Expect.FAIL)

test/langtools/tools/javac/diags/examples.not-yet.txt

@@ -214,4 +214,4 @@ compiler.err.preview.without.source.or.release
 compiler.misc.illegal.signature                               # the compiler can now detect more non-denotable types before class writing
 
 # this one needs a forged class file to be reproduced
-compiler.err.annotation.unrecognized.attribute.name
+compiler.err.annotation.unrecognized.attribute.name

test/langtools/tools/javac/diags/examples/ProcUseProcOrImplicit/ProcUseProcOrImplicit.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2010, 2023, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -22,6 +22,7 @@
  */
 
 // key: compiler.warn.proc.use.proc.or.implicit
+// key: compiler.note.implicit.annotation.processing
 // options: -Xprefer:source
 
 import p.SomeClass;

test/langtools/tools/javac/platform/PlatformProviderTest.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015, 2022, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2015, 2023, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -239,7 +239,7 @@ public Plugin getPlugin() {
 
         @Override
         public List<String> getAdditionalOptions() {
-            return Arrays.asList("-Xlint:rawtypes", "-XDrawDiagnostics");
+            return Arrays.asList("-Xlint:rawtypes", "-XDrawDiagnostics", "-proc:full");
         }
 
         @Override

test/langtools/tools/javac/processing/ReportOnImportedModuleAnnotation/ReportOnImportedModuleAnnotation.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, 2021, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2019, 2023, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -71,7 +71,7 @@ public static void main(String[] args) throws Exception {
         fileManager.setLocationFromPaths(StandardLocation.CLASS_OUTPUT, List.of(testOutputPath));
 
         final StringWriter outputWriter = new StringWriter();
-        compiler.getTask(outputWriter, fileManager, null, List.of("-XDrawDiagnostics", "--module", "mod"), null, null).call();
+        compiler.getTask(outputWriter, fileManager, null, List.of("-XDrawDiagnostics", "--module", "mod", "-proc:full"), null, null).call();
 
         String actualOutput = outputWriter.toString();
         String expectedOutput = Files.readString(testBasePath.resolve("ReportOnImportedModuleAnnotation.out"));