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Using the "buildExtraJAR.xml" files which have target and source set to 1.3, it appears that 1.3 incompatible class files are generated if building with 1.4.*
I could not reproduce the problem...tried generating the JARs on 1.4.2 and exporting the plugin and then relaunching on 1.3.1. Also tried generating the JARs on 1.4.2 and then launching selfhosting on 1.3.1. But we were missing the target and source attributes so it should be possible. Fixed in org.eclipse.externaltools.ui/scripts/buildExtraJar.xml by setting the target and source.
Verified.