[cross-project-issues-dev] Europa packed jars

[Kim Moir <Kim_Moir@xxxxxxxxxx>]

As part of the investigation for 

Installing JDT from Europa discovery
site is completely broken
https://bugs.eclipse.org/bugs/show_bug.cgi?id=192983

Andrew Niefer discovered  a problem
with a packed jar where the plugin has class files at the root of the plugin
and nested jars.  When a user attempted to install the feature in
update manager, the signature didn't verify and update failed.  If
you're using a 1.5 or greater vm, you will default to using for packed
jars for Europa features.   Yesterday, Andrew wrote a tool to verify
the signatures of packed jars in an update site (available in bug https://bugs.eclipse.org/bugs/show_bug.cgi?id=193568).
I ran this tool against the entire Europa staging site this morning and
only two plugins exhibited this behaviour, org.eclipse.jdt.core and org.eclipse.birt.report.engine.

We don't yet know the root cause of
this issue.  This issue can be avoided by excluding nested jars from
being packed in your plugin if your plugin matches the shape described
above.   

In conclusion,
->This issue only impacts two plugins
on the entire Europa update site
-> Most plugins do not have this
shape
-> I wouldn't advocate that teams
change their plugins unless they own one identified in these bugs

JDT Core  https://bugs.eclipse.org/bugs/show_bug.cgi?id=193570
BIRT https://bugs.eclipse.org/bugs/show_bug.cgi?id=193587


Kim