Start firefox / iceweasel with the following environment set:
ICEDTEAPLUGIN_DEBUG=true iceweasel
Published December 12th, 2012
How to get Java debug output when using OpenJDK IcedTea plugin
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why don't make _one_ development kit that rules them all? as a java n00b, to many jdk out there beaflfd me, and end up installing them all just in case..