[Bug classpath/23859] New: Assertion failure when calling JTabbedPane.addTab(null, ...)

[konqueror at gmx dot de]

Thanks to gcj's ability to compile native code that can be debugged with
gdb, I finally could narrow down and report this bug that I first
noticed with libgcj4 or libgcj5.  The program runs fine under Sun's JVM,
but libgcj aborts because of an assertion failure.

I keep getting an assertion failure and SIGABRT when my program calls
JTabbedPane.addTab() with null first argument.  If I replace the first
argument with a string (even an empty one) or if I run the code under
Sun's JVM, there is no assertion failure.  Here is a minimal test case:

cat > crash.java << EOF
import javax.swing.JTabbedPane;
import javax.swing.JTable;

class crash
{
  public static final void main (String args[]) {
    JTabbedPane t = new JTabbedPane ();
    JTable jt = new JTable ();
    t.addTab (null, null, jt);
  }
}
EOF
gcj-4.0 --main=crash crash.java
./a.out
** ERROR **: file
../../../src/libjava/jni/gtk-peer/gnu_java_awt_peer_gtk_GdkFontPeer.c: line 290
(Java_gnu_java_awt_peer_gtk_GdkFontPeer_getTextMetrics): assertion failed: (cstr
!= NULL)
aborting...

Replace the first argument of t.addTab() with "", and the assertion
won't fail.  Note that the program works under Sun's JVM.

        Marko

-- 
           Summary: Assertion failure when calling JTabbedPane.addTab(null,
                    ...)
           Product: classpath
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: classpath
        AssignedTo: roman at kennke dot org
        ReportedBy: konqueror at gmx dot de
                CC: bug-classpath at gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23859