[Bug awt/29399] New: Core dump when trying awt.Demo Radio button test

[realthunder at pmail dot ntu dot edu dot sg]

I am using Classpath-0.92 + JamVM-1.4.3 + qt-peer + cygwin.

The problem is straight forward. When clicking Radio Buttons in awt.Demo, it
generate segment fault exception. The cause, however, took me several days to
track. The suspect code is at
$(CLASSPATH)/native/jni/qt-peer/qtcheckboxpeer.cpp:107. I pasted here as
follows:

JNIEXPORT void JNICALL Java_gnu_java_awt_peer_qt_QtCheckboxPeer_init
(JNIEnv *env, jobject obj)
{
  QWidget *parentWidget = (QWidget *)getParentWidget(env, obj);

  QAbstractButton *cb = (QAbstractButton *) getNativeObject( env, obj );
  if (cb)
    delete cb;

As for my undstanding of the inner working of qt-peer, there is no reason why
we need to delete this QAbstractButton object here. In fact, at the time this
QtCheckboxPeer_init is called, there is no binding of any native object yet. I
could be wrong, but by commenting out this qestionable deletion, the example
runs fine.


-- 
           Summary: Core dump when trying awt.Demo Radio button test
           Product: classpath
           Version: 0.92
            Status: UNCONFIRMED
          Severity: major
          Priority: P3
         Component: awt
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: realthunder at pmail dot ntu dot edu dot sg


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29399