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[news.eclipse.platform] Re: Can't export products: ant NoClassDefFoundError
I've just finished downloading a fresh 3.3.1.1 platform along with the extras I use (EMF/XSD/SDO, WTP, DTP) and the problem has gone away. Something was broken in my installation.

Alexandros Karypidis wrote:

Hi,

When I try to export a product from my workspace, the process fails, due to reasons that have something to do with ant. Evidently, the export uses some ant script to do its magic. I get a lot of "Malformed URL" errors in my log (attached).

As you can see, ant is trying to "addLibraries()" but a getURLConverter() in the eclipse core throws NPEs at it:

============================
java.lang.NullPointerException
at org.eclipse.core.internal.runtime.Activator.getURLConverter(Activator.java:313)

at org.eclipse.core.runtime.FileLocator.toFileURL(FileLocator.java:163)
at org.eclipse.ant.core.AntCorePreferences.addLibraries(AntCorePreferences.java:834) 

============================

After several failed calls to addLibraries(), ant goes on to do something else and fails with:

============================
java.lang.NoClassDefFoundError: org/apache/tools/ant/BuildException
    at java.lang.Class.getDeclaredConstructors0(Native Method)
    at java.lang.Class.privateGetDeclaredConstructors(Unknown Source)
    at java.lang.Class.getConstructor0(Unknown Source)
    at java.lang.Class.newInstance0(Unknown Source)
    at java.lang.Class.newInstance(Unknown Source)
    at org.eclipse.ant.core.AntRunner.run(AntRunner.java:323)
============================

It's been a while since I've exported a product from my workspace so I can't attribute this to some specific modification in my eclipse installation. The most recent change was updating to Eclipse 3.3.1.1. My about box says:

Eclipse SDK
Version: 3.3.1.1
Build id: M20071023-1652

I've started up with a clean workspace, used the RCP wizard to
create a "Hello world" application and attempted an export with the same results.