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The NbEventSpy class added for #194090 does not escape backslash characters appearing in string literals. This results in errors when JSONParser parses the resulting strings in CommandLineOutputHandler. If the full path to a project contains \t, \r, \n, or others (e.g. c:\antlr\tool contains \t), then the Maven build will fail in the IDE. The automatic error reporting for the resulting problem is assigning the stack traces as duplicates of #229135. Based on the rate duplicates are appearing, I believe this issue is a high priority.
http://hg.netbeans.org/core-main/rev/9862b230a262 now the encoding is done by simple json library, so all the encoding rules should be followed now. thanks for the report.
Integrated into 'main-golden', will be available in build *201305142300* on http://bits.netbeans.org/dev/nightly/ (upload may still be in progress) Changeset: http://hg.netbeans.org/main-golden/rev/9862b230a262 User: Milos Kleint <mkleint@netbeans.org> Log: #229609 use simple json on nb event spy side as well (in maven JVM), to prevent classpath clashes, repackage the simple json library to a netbeans specific package. use jarjar ant task to perform the job.