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If a <built-to> item of an extra compilation unit is pointing to a single file instead of a directory or an archive file, NetBeans displays lots of NPE when scanning and compiling project dependencies of NetBeans modules. Even if its a misusage of <built-to> items, NetBeans should not fail to scan and compile project dependencies. It is better to ignore error or just write a trace to message.log.
Created attachment 61438 [details] proposed fix
Accepted with modifications to log message, thanks. core-main #94663e8fc0cd
Integrated into 'main-golden', available in NB_Trunk_Production #206 build Changeset: http://hg.netbeans.org/main/rev/94663e8fc0cd User: Jesse Glick <jglick@netbeans.org> Log: #135163: behave more robustly when a <built-to> entry is not a dir or JAR.