This has been asked elsewhere, but not here; see:
http://stackoverflow.com/questions/3324848/scala-on-google-app-engine-with-eclipse
A Scala-based GAE project causes the Eclipse plugin to freak out on
Scala sources, obviously because they're not Java sources. The
exception backtrace begins:
java.lang.NullPointerException
at
com.google.appengine.eclipse.core.validators.java.JavaCompilationParticipant.validateCompilationUnit(JavaCompilationParticipant.java:
74)
at
com.google.appengine.eclipse.core.validators.java.JavaCompilationParticipant.reconcile(JavaCompilationParticipant.java:
180)
at org.eclipse.jdt.internal.core.ReconcileWorkingCopyOperation
$1.run(ReconcileWorkingCopyOperation.java:257)
...
In project Properties -> Google -> App Engine -> Validation, I've
tried adding all sorts of patterns to exclude these source files,
including **.scala, **/*.scala, and even simply **/* and **. Nothing
seems to prevent this exception, and it's quite annoying, as it causes
the Eclipse Error Log view to keep popping up. Is there a known issue
here with a possibly known fix?
Environment of the above: Eclipse Helios SR2 (3.6.2), Google Plugin
for Eclipse 2.2.1, GAE/J 1.4.3.
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