[Bug libgcj/12416] New: java.lang.Class.getFields returns duplicate entries.

[suckfish at ihug dot co dot nz]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12416

           Summary: java.lang.Class.getFields returns duplicate entries.
           Product: gcc
           Version: 3.4
            Status: UNCONFIRMED
          Severity: minor
          Priority: P3
         Component: libgcj
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: suckfish at ihug dot co dot nz
                CC: gcc-bugs at gcc dot gnu dot org

/*
The reflection APIs work in a manner inconsistent with the sun java
sdk when an interface is inherited multiple times.

The java.lang.Class.getFields() method in libjava returns a field once
for each inheritence path to it.  Sun java only returns the field
once.

$ dev/test/bin/gcj -o printfields --main=printfields printfields.java ~]

$ LD_LIBRARY_PATH=./dev/test/lib ./printfields
public static final int A.a
public static final int A.a

$ /usr/java/j2sdk1.4.2/bin/javac printfields.java
$ /usr/java/j2sdk1.4.2/bin/java printfields
public static final int A.a

The sun documentation doesn't explicitly say what should happen in
this case, but my reading is that a field should only occur once.

With the current implementation, it appears possible to
crash the java.lang.Class implementation with a pathological case
... although getting the compiler to compile such a case would be
interesting...

[nitpicking while waiting for a bootstrap to run.]
 */

interface A
{
    int a = 0;
}
interface B extends A
{
}
interface C extends A
{
}

public class printfields implements B, C
{
    static public void main (String[] unused)
    {
	java.lang.reflect.Field[] fields = printfields.class.getFields();

	for (int i = 0; i != fields.length; ++i) {
	    System.out.println (fields[i]);
	}
    }
}