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Description
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Create and compile a test class with JDK 6:
---%<---
import java.io.IOException;
import java.net.URI;
import java.util.Arrays;
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.ExecutableElement;
import javax.lang.model.element.TypeElement;
import javax.lang.model.type.ExecutableType;
import javax.tools.JavaCompiler;
import javax.tools.JavaFileObject;
import javax.tools.SimpleJavaFileObject;
import javax.tools.ToolProvider;
public class Test {
public static void main(String[] args) throws Exception {
String dest = System.getProperty("java.io.tmpdir");
class DummyFO extends SimpleJavaFileObject {
String n;
public DummyFO(String n) {
super(URI.create("nowhere:/" + n + ".java"), JavaFileObject.Kind.SOURCE);
this.n = n;
}
public CharSequence getCharContent(boolean ignoreEncodingErrors) throws IOException {
return "public class " + n + " {" + n + "(java.util.List<String> l) {}}";
}
}
System.out.println("Compiling with sources:");
JavaCompiler.CompilationTask task = ToolProvider.getSystemJavaCompiler().getTask(
null, null, null,
Arrays.asList("-d", dest),
null, Collections.singleton(new DummyFO("C")));
task.setProcessors(Collections.singleton(new P()));
task.call();
System.out.println("Compiling with binaries w/o -g:");
task = ToolProvider.getSystemJavaCompiler().getTask(
null, null, null,
Arrays.asList("-classpath", dest, "-d", dest),
null, Collections.singleton(new DummyFO("Dummy")));
task.setProcessors(Collections.singleton(new P()));
task.call();
task = ToolProvider.getSystemJavaCompiler().getTask(
null, null, null,
Arrays.asList("-d", dest, "-g"),
null, Collections.singleton(new DummyFO("C")));
task.call();
System.out.println("Compiling with binaries w/ -g:");
task = ToolProvider.getSystemJavaCompiler().getTask(
null, null, null,
Arrays.asList("-classpath", dest, "-d", dest),
null, Collections.singleton(new DummyFO("Dummy")));
task.setProcessors(Collections.singleton(new P()));
task.call();
}
@SupportedAnnotationTypes("*")
@SupportedSourceVersion(SourceVersion.RELEASE_6)
static class P extends AbstractProcessor {
boolean ran = false;
public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) {
if (!ran) {
ran = true;
ExecutableElement m = (ExecutableElement) processingEnv.getElementUtils().getTypeElement("C").getEnclosedElements().get(0);
System.out.println("method: " + m);
System.out.println("parameters[0]: " + m.getParameters().get(0).asType());
System.out.println("parameterTypes[0]: " + ((ExecutableType) m.asType()).getParameterTypes().get(0));
}
return true;
}
}
}
---%<---
Expected output:
---%<---
Compiling with sources:
method: C(java.util.List<java.lang.String>)
parameters[0]: java.util.List<java.lang.String>
parameterTypes[0]: java.util.List<java.lang.String>
Compiling with binaries w/o -g:
method: C(java.util.List<java.lang.String>)
parameters[0]: java.util.List<java.lang.String>
parameterTypes[0]: java.util.List<java.lang.String>
Compiling with binaries w/ -g:
method: C(java.util.List<java.lang.String>)
parameters[0]: java.util.List<java.lang.String>
parameterTypes[0]: java.util.List<java.lang.String>
---%<---
Actual output w/ -showversion:
---%<---
java version "1.6.0-rc"
Java(TM) SE Runtime Environment (build 1.6.0-rc-b98)
Java HotSpot(TM) Client VM (build 1.6.0-rc-b98, mixed mode, sharing)
Compiling with sources:
method: C(java.util.List<java.lang.String>)
parameters[0]: java.util.List<java.lang.String>
parameterTypes[0]: java.util.List<java.lang.String>
Compiling with binaries w/o -g:
method: C(java.util.List<java.lang.String>)
parameters[0]: java.util.List<java.lang.String>
parameterTypes[0]: java.util.List<java.lang.String>
Compiling with binaries w/ -g:
method: C(java.util.List<java.lang.String>)
parameters[0]: java.util.List
parameterTypes[0]: java.util.List<java.lang.String>
---%<---
When loading the class from bytecode compiled with -g, the ExecutableElement for <init>(List<String>) reports parameters[0].asType() as being List, whereas it should be List<String>. ExecutableType gets it right.
But the bug does not occur if you create the parse tree from sources; or if you create it from classes compiled without -g.
Posted Date : 2006-09-07 20:08:24.0
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