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java.lang.NullPointerException at java.util.TreeMap.put(TreeMap.java:563) at java.util.TreeSet.add(TreeSet.java:255) at com.google.gwt.thirdparty.guava.common.collect.ForwardingCollection.add(ForwardingCollection.java:84) at com.google.gwt.core.ext.linker.TypeIndexedSet.add(TypeIndexedSet.java:101) at com.google.gwt.core.ext.linker.ArtifactSet.add(ArtifactSet.java:42) at com.google.gwt.core.linker.SymbolMapsLinker.link(SymbolMapsLinker.java:330) at com.google.gwt.core.ext.linker.impl.StandardLinkerContext.invokeLinkForOnePermutation(StandardLinkerContext.java:384) at com.google.gwt.dev.Link.finishPermutation(Link.java:483) at com.google.gwt.dev.Link.doSimulatedShardingLink(Link.java:445) at com.google.gwt.dev.Link.link(Link.java:178) at com.google.gwt.dev.Compiler.compile(Compiler.java:244) at com.google.gwt.dev.codeserver.Recompiler.doCompile(Recompiler.java:362) at com.google.gwt.dev.codeserver.Recompiler.compile(Recompiler.java:175) at com.google.gwt.dev.codeserver.Recompiler.recompile(Recompiler.java:134) at com.google.gwt.dev.codeserver.Outbox.recompile(Outbox.java:135) at com.google.gwt.dev.codeserver.JobRunner.recompile(JobRunner.java:113) at com.google.gwt.dev.codeserver.JobRunner.access$000(JobRunner.java:37) at com.google.gwt.dev.codeserver.JobRunner$2.run(JobRunner.java:90) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745)