Since a few months, I encountered an annoying error in Aptana Studio and Eclipse 3.7 (the autonomous packages, not the packages from the repositories) whenever I tried to do a git or hg action.

I could live without until now, but today, it was really bothering me.

The error is:

Unhandled event loop exception
No more handles [Unknown Mozilla path (MOZILLA_FIVE_HOME not set)]

The log file showed the following backtrace:

!ENTRY org.eclipse.ui 4 0 2011-12-16 17:17:30.825
!MESSAGE Unhandled event loop exception
!STACK 0
org.eclipse.swt.SWTError: No more handles [Unknown Mozilla path (MOZILLA_FIVE_HOME not set)]
    at org.eclipse.swt.SWT.error(SWT.java:4109)
    at org.eclipse.swt.browser.Mozilla.initMozilla(Mozilla.java:1739)
    at org.eclipse.swt.browser.Mozilla.create(Mozilla.java:656)
    at org.eclipse.swt.browser.Browser.<init>(Browser.java:119)
    at com.aptana.git.ui.internal.actions.CommitDialog.createDiffArea(CommitDialog.java:237)
    at com.aptana.git.ui.internal.actions.CommitDialog.createDialogArea(CommitDialog.java:158)

    [...]

    at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:620)
    at org.eclipse.equinox.launcher.Main.basicRun(Main.java:575)
    at org.eclipse.equinox.launcher.Main.run(Main.java:1408)
    at org.eclipse.equinox.launcher.Main.main(Main.java:1384)

To make it short, after having read a lot of posts about [this](<http://stackoverflow.com/questions/1017945/problem-with-aptana-studio-xulrunner-8-1) problem, it seemed it was enough to give the path to Xulrunner to Aptana.

On my Arch Linux, it was

export MOZILLA_FIVE_HOME=/usr/lib/xulrunner-8.0

Trying to start Aptana Studio, I had a new error. It simply stated

XPCOM error -2147467261

The solution is that Aptana Studio cannot work with the version of Xulrunner in Arch LinuX repositories because it is too recent.

To solve this problem, I had to install xulrunner 1.9.2 from AUR:

yaourt -S xulrunner192

The PKGBUILD was broken this morning and ended in a 404 Error when fetching sources. If you have the same problem, here is an updated PKGBUILD <https://gist.github.com/1486851>__

Finally, I put

 -Dorg.eclipse.swt.browser.XULRunnerPath=/usr/lib/xulrunner-1.9.2

at the end of the AptanaStudio3.ini file in the Aptana Studio folder. For the package in the Arch Linux repositories, this file is /usr/share/aptana/AptanaStudio3.ini.