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get a "A java.lang . no classdef found error" at start up of netbeans and to report
Created attachment 43108 [details] log file
The classfile module is a library for reading classfiles, not a dumping ground for all class-related issues. As you can see, I updated the title by cutting and pasting the first line of the exception, then mapped the "org.netbeans.modules.xml" package portion to the "xml" component. This may not be the actual problem module, but it's a lot closer.
*** This issue has been marked as a duplicate of 101113 ***
Verified duplicate