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git://github.com/rzwitserloot/lombok.patcher.git clean & dist, then run TestAddFieldScript. Gives a NCDFE on org.objectweb.asm.ClassWriter. Inspection of build script reveals a curious setup: <junit> uses <classpath path="build/pack"/> where an earlier unpackLibs target runs <unjar dest="build/pack"><path refid="patcher.libs.path"/></unjar> which unpacks asm.jar into this dir. Since compilation also is sent to build/pack, the IDE's SFBQ assumes that all classes in this dir must be from src, which is not true in this case. Could probably detect somehow that <unjar> is being run, then keep track of the fact that several origin JARs are being copied into build/pack. Thereafter, whenever build/pack is used in a CP entry, quietly insert those origin JARs too. Of course there would be no issue if the original build script were just written more sanely: delete the unpackLibs target, include <classpath refid="patcher.libs.path"/> in <junit>, and fix <jar> in dist to include <zipfileset>s from the libs dir. (This would also be more efficient.)
This old bug may not be relevant anymore. If you can still reproduce it in 8.2 development builds please reopen this issue. Thanks for your cooperation, NetBeans IDE 8.2 Release Boss