java crashed with signal 5 in _XError()

[Sef]

1) Lucid Lynx - 10.04

2) Openjdk-6

3) bug report came up.

4) trying to get into a chat site for over 18. (http://chatxplanet.com)

ProblemType: Crash
Architecture: amd64
CheckboxSubmission: 99b5eeec5c67d3139a8cafec670cdb05
CheckboxSystem: d00f84de8a555815fa1c4660280da308
Date: Sat Jan 30 21:54:06 2010
DistroRelease: Ubuntu 10.04
ExecutablePath: /usr/lib/jvm/java-6-openjdk/jre/bin/java
InstallationMedia: Error: [Errno 13] Permission denied: '/var/log/installer/media-info'
Package: openjdk-6-jre-headless 6b17-1.7-0ubuntu1
ProcCmdline: /usr/lib/jvm/java-6-openjdk/jre/lib/amd64/../../bin/java sun.applet.PluginMain
ProcEnviron:
 LANG=C
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.32-12.16-generic
Signal: 5
SourcePackage: openjdk-6
StacktraceTop:
 ?? () from /usr/lib/libgdk-x11-2.0.so.0
 _XError () from /usr/lib/libX11.so.6
 _XReply () from /usr/lib/libX11.so.6
 XGetImage () from /usr/lib/libX11.so.6
 ?? ()
Title: java crashed with signal 5 in _XError()
Uname: Linux 2.6.32-12-generic x86_64
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare

[Apport retracing service (apport)]

Thank you for taking the time to report this crash and helping to make Ubuntu better. This particular crash has already been reported and is a duplicate of bug #505995, so is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find.

[Bevor (bugs-devgems)]

Since the update to Lucid this always happens to me when I write code in Eclipse (from downloadsite, not from packet manager) and want to autocomplete the code with STRG + SPACE. Eclipse crashes then.
I replaced openjdk with Sun's jdk but the problem persists.

(I have to post here because I get the following in bug #505995:
Not allowed here
Sorry, you don't have permission to access this page.)

[Bevor (bugs-devgems)]

Additional information:
The crash doesn't happen always in Eclipse. When I auto complete a variable with STRG + SPACE, it does not happen. But when I type the code -> System. -> then the options window with the methods opens -> and when I choose currentTimeMillis() from the options window Eclipse always crashes.