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import java.util.Collections;
import java.util.Set;
import javax.annotation.processing.AbstractProcessor;
import javax.annotation.processing.RoundEnvironment;
import javax.annotation.processing.SupportedAnnotationTypes;
import javax.annotation.processing.SupportedSourceVersion;
import javax.lang.model.SourceVersion;
import javax.lang.model.element.TypeElement;
import javax.tools.Diagnostic;
import javax.tools.JavaCompiler;
import javax.tools.ToolProvider;
public class Demo {
public static void main(String[] args) throws Exception {
File src = new File(System.getProperty("java.io.tmpdir"), "C.java");
Writer w = new FileWriter(src);
try {
w.write("import static p.Generated.m;\nclass C {{m();}}\n");
w.flush();
} finally {
w.close();
JavaCompiler jc = ToolProvider.getSystemJavaCompiler();
JavaCompiler.CompilationTask task = jc.getTask(null, null, null, null, null, jc.getStandardFileManager(null, null, null).getJavaFileObjects(src));
task.setProcessors(Collections.singleton(new Proc()));
System.out.println("success? " + task.call());
@SupportedAnnotationTypes("*")
@SupportedSourceVersion(SourceVersion.RELEASE_6)
private static class Proc extends AbstractProcessor {
int written;
@Override public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) {
if (roundEnv.processingOver() || written++ > 0) {
return false;
processingEnv.getMessager().printMessage(Diagnostic.Kind.NOTE, "writing Generated.java");
try {
Writer w = processingEnv.getFiler().createSourceFile("p.Generated").openWriter();
try {
w.write("package p; public class Generated {public static void m() {}}");
} finally {
w.close();
} catch (IOException x) {
processingEnv.getMessager().printMessage(Diagnostic.Kind.ERROR, x.toString());
return true;
---%<---
Output under JDK 6 is noisy but compilation succeeds:
---%<---
java version "1.6.0_31"
Java(TM) SE Runtime Environment (build 1.6.0_31-b04)
Java HotSpot(TM) Server VM (build 20.6-b01, mixed mode)
/tmp/C.java:1: package p does not exist
import static p.Generated.m;
/tmp/C.java:1: static import only from classes and interfaces
import static p.Generated.m;
Note: writing Generated.java
success? true
---%<---
But using JDK 7 it fails:
---%<---
java version "1.7.0_03"
Java(TM) SE Runtime Environment (build 1.7.0_03-b04)
Java HotSpot(TM) Server VM (build 22.1-b02, mixed mode)
/tmp/C.java:1: error: package p does not exist
import static p.Generated.m;
/tmp/C.java:1: error: static import only from classes and interfaces
import static p.Generated.m;
/tmp/C.java:2: error: cannot find symbol
class C {{m();}}
symbol: method m()
location: class C
3 errors
success? false
---%<---
(Confirmed bug also in 7u1, 7u2, and 7u4b18.)
04-04-2012
