Eclipse becomes slow after a while and gives an exception when exited

[Maarten Bezemer]

While developing a Java (GEF) plugin, Eclipse becomes very slow at a certain point after a couple of hours. (I am unsure why)
When I quit Eclipse I get an 'Unhandled event loop exception' (see attachment)

I do not have a stack trace, as clicking on the 'Show Error Log' is doing nothing.

$ lsb_release -rd
Description: Ubuntu 11.10
Release: 11.10
$ apt-cache policy eclipse
eclipse:
  Installed: 3.7.0-0ubuntu1
  Candidate: 3.7.0-0ubuntu1
  Version table:
 *** 3.7.0-0ubuntu1 0
        500 http://nl.archive.ubuntu.com/ubuntu/ oneiric/universe amd64 Packages
        100 /var/lib/dpkg/status

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: openjdk-6-jre-headless 6b23~pre11-0ubuntu1.11.10
ProcVersionSignature: Ubuntu 3.0.0-14.23-generic 3.0.9
Uname: Linux 3.0.0-14-generic x86_64
NonfreeKernelModules: fglrx
ApportVersion: 1.23-0ubuntu4
Architecture: amd64
Date: Wed Dec 14 14:54:04 2011
ExecutablePath: /usr/lib/jvm/java-6-openjdk/jre/bin/java
InstallationMedia: Kubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
LocalLibraries: /home/bzr/.eclipse/org.eclipse.platform_3.7.0_155965261/configuration/org.eclipse.osgi/bundles/118/1/.cp/libswt-atk-gtk-3735.so /home/bzr/.eclipse/org.eclipse.platform_3.7.0_155965261/configuration/org.eclipse.osgi/bundles/118/1/.cp/libswt-pi-gtk-3735.so /home/bzr/.eclipse/org.eclipse.platform_3.7.0_155965261/configuration/org.eclipse.osgi/bundles/118/1/.cp/libswt-webkit-gtk-3735.so /home/bzr/.eclipse/org.eclipse.platform_3.7.0_155965261/configuration/org.eclipse.osgi/bundles/118/1/.cp/libswt-cairo-gtk-3735.so /home/bzr/.eclipse/org.eclipse.platform_3.7.0_155965261/configuration/org.eclipse.osgi/bundles/118/1/.cp/libswt-gtk-3735.so
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: openjdk-6
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.