Generic Signatures

Fri Nov 3 19:19:00 GMT 2006

I can't get even simple tests with generic signatures to work. Like
this:
public class test2
{
 static class A extends ArrayList<String> {};
 public static void main(String[] args)
 {
 A a = new A();
 Object x = a;
 ((Collection)x).add(new Byte((byte) 1));
 System.out.println(x.getClass().getGenericSuperclass());
 System.out.println("We have a list parametrized with: " +
 ((ParameterizedType)x.getClass().getGenericSuperclass()).getActualTypeArguments()[0]);
 }
}
should do this:
java.util.ArrayList<java.lang.String>
We have a list parametrized with: class java.lang.String
but does this:
Exception in thread "main" java.lang.TypeNotPresentException: type "java$util$ArrayList" not found
 at gnu.java.lang.reflect.ParameterizedTypeImpl.resolve(GenericSignatureParser.java:127)
 at gnu.java.lang.reflect.TypeImpl.resolve(TypeImpl.java:59)
 at gnu.java.lang.reflect.ClassSignatureParser.getSuperclassType(ClassSignatureParser.java:83)
 at java.lang.Class.getGenericSuperclass(Class.java:1232)
 at test2.main(test2.java:12)
Caused by: java.lang.ClassNotFoundException: java$util$ArrayList not found in gnu.gcj.runtime.SystemClassLoader{urls=[file:./], parent=gnu.gcj.runtime.ExtensionClassLoader{urls=[], parent=null}}
 at java.net.URLClassLoader.findClass(URLClassLoader.java:1081)
 at gnu.gcj.runtime.SystemClassLoader.findClass(natSystemClassLoader.cc:27)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:317)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:260)
 at java.lang.Class.forName(natClass.cc:103)
 at gnu.java.lang.reflect.ParameterizedTypeImpl.resolve(GenericSignatureParser.java:123)
 ...4 more
Is it the case that this stuff hasn't ever worked? I'll allow that we
have an older cut of the generics branch in gcj.
Thanks,
Andrew.