Reading the stacktrace, I think the problem is 
in 
https://github.com/gwtproject/gwt/blob/master/dev/core/src/com/google/gwt/core/linker/SymbolMapsLinker.java#L282,
looks like disk cache returns null there.

Did you try to remove folder /var/folders/63/qxvnlkdn7yq2n689wbryx_
vwrfzqfp/T/gwt-codeserver-2706361954965741673.tmp
and run compile again?


On Friday, August 12, 2016 at 12:04:44 AM UTC+3, Alberto Mancini wrote:
>
> Hello,
> in the attempt of porting an internal project from beta1 to rc1 we faced 
> an issue i do not understand how to debug. 
>
> The project uses errai but my feeling is that the problem is not related 
> to it because similar projects with errai work without problems. 
>
> Essentially SDM fails during the first compilation and the problem seems 
> in the generation of the source maps. 
>
> The relevant error log follows.
>
> [INFO] GET /recompile/it.e.u.Application
> [INFO]    Job it.e.u.Application_1_0
> [INFO]       starting job: it.e.u.Application_1_0
> [INFO]       binding: user.agent=safari
> [INFO]       Compiling module it.e.u.Application
> ...
>
> [INFO]          Unification traversed 54946 fields and methods and 5256 
> types. 5210 are considered part of the current module and 5210 had all of 
> their fields and methods traversed.
> [INFO]          Compiling 1 permutation
> [INFO]             Compiling permutation 0...
> [INFO]             Linking per-type JS with 5190 new/changed types.
> [INFO]             Source Maps Enabled
> [INFO]          Compile of permutations succeeded
> [INFO]          Compilation succeeded -- 35.850s
> [INFO]       Linking into 
> /var/folders/63/qxvnlkdn7yq2n689wbryx_vwrfzqfp/T/gwt-codeserver-2706361954965741673.tmp/it.e.u.Application/compile-2/war/it.e.u.Application;
>  Writing extras to 
> /var/folders/63/qxvnlkdn7yq2n689wbryx_vwrfzqfp/T/gwt-codeserver-2706361954965741673.tmp/it.e.u.Application/compile-2/extras/it.e.u.Application*[INFO]
>           [WARN] Can't write source map 
> CCA06A04193EDF5B35BDE836DF1FABBE_sourceMap0.json
> [INFO] java.lang.NullPointerException*
> [INFO]        at 
> com.google.gwt.thirdparty.debugging.sourcemap.SourceMapConsumerV3.parse(SourceMapConsumerV3.java:101)
> [INFO]        at 
> com.google.gwt.thirdparty.debugging.sourcemap.SourceMapConsumerV3.parse(SourceMapConsumerV3.java:88)
> [INFO]        at 
> com.google.gwt.thirdparty.debugging.sourcemap.SourceMapConsumerV3.parse(SourceMapConsumerV3.java:78)
> [INFO]        at 
> com.google.gwt.thirdparty.debugging.sourcemap.SourceMapGeneratorV3.mergeMapSection(SourceMapGeneratorV3.java:311)
> [INFO]        at 
> com.google.gwt.core.linker.SymbolMapsLinker.link(SymbolMapsLinker.java:316)
> [INFO]        at 
> com.google.gwt.core.ext.linker.impl.StandardLinkerContext.invokeLinkForOnePermutation(StandardLinkerContext.java:384)
> [INFO]        at com.google.gwt.dev.Link.finishPermutation(Link.java:483)
> [INFO]        at 
> com.google.gwt.dev.Link.doSimulatedShardingLink(Link.java:445)
> [INFO]        at com.google.gwt.dev.Link.link(Link.java:178)
> [INFO]        at com.google.gwt.dev.Compiler.compile(Compiler.java:244)
> [INFO]        at 
> com.google.gwt.dev.codeserver.Recompiler.doCompile(Recompiler.java:362)
> [INFO]        at 
> com.google.gwt.dev.codeserver.Recompiler.compile(Recompiler.java:175)
> [INFO]        at 
> com.google.gwt.dev.codeserver.Recompiler.recompile(Recompiler.java:134)
> [INFO]        at 
> com.google.gwt.dev.codeserver.Outbox.recompile(Outbox.java:135)
> [INFO]        at 
> com.google.gwt.dev.codeserver.JobRunner.recompile(JobRunner.java:113)
> [INFO]        at 
> com.google.gwt.dev.codeserver.JobRunner.access$000(JobRunner.java:37)
> [INFO]        at 
> com.google.gwt.dev.codeserver.JobRunner$2.run(JobRunner.java:90)
> [INFO]        at 
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
> [INFO]        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
> [INFO]        at 
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> [INFO]        at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> [INFO]        at java.lang.Thread.run(Thread.java:745)
> [INFO]          Invoking Linker Export CompilationResult symbol maps
> [INFO]             [ERROR] Failed to link
> [INFO] java.lang.NullPointerException
> [INFO]        at java.util.TreeMap.put(TreeMap.java:563)
> [INFO]        at java.util.TreeSet.add(TreeSet.java:255)
> [INFO]        at 
> com.google.gwt.thirdparty.guava.common.collect.ForwardingCollection.add(ForwardingCollection.java:84)
> [INFO]        at 
> com.google.gwt.core.ext.linker.TypeIndexedSet.add(TypeIndexedSet.java:101)
> [INFO]        at 
> com.google.gwt.core.ext.linker.ArtifactSet.add(ArtifactSet.java:42)
> [INFO]        at 
> com.google.gwt.core.linker.SymbolMapsLinker.link(SymbolMapsLinker.java:330)
> [INFO]        at 
> com.google.gwt.core.ext.linker.impl.StandardLinkerContext.invokeLinkForOnePermutation(StandardLinkerContext.java:384)
> [INFO]        at com.google.gwt.dev.Link.finishPermutation(Link.java:483)
> [INFO]        at 
> com.google.gwt.dev.Link.doSimulatedShardingLink(Link.java:445)
> [INFO]        at com.google.gwt.dev.Link.link(Link.java:178)
> [INFO]        at com.google.gwt.dev.Compiler.compile(Compiler.java:244)
> [INFO]        at 
> com.google.gwt.dev.codeserver.Recompiler.doCompile(Recompiler.java:362)
> [INFO]        at 
> com.google.gwt.dev.codeserver.Recompiler.compile(Recompiler.java:175)
> [INFO]        at 
> com.google.gwt.dev.codeserver.Recompiler.recompile(Recompiler.java:134)
> [INFO]        at 
> com.google.gwt.dev.codeserver.Outbox.recompile(Outbox.java:135)
> [INFO]        at 
> com.google.gwt.dev.codeserver.JobRunner.recompile(JobRunner.java:113)
> [INFO]        at 
> com.google.gwt.dev.codeserver.JobRunner.access$000(JobRunner.java:37)
> [INFO]        at 
> com.google.gwt.dev.codeserver.JobRunner$2.run(JobRunner.java:90)
> [INFO]        at 
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
> [INFO]        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
> [INFO]        at 
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> [INFO]        at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> [INFO]        at java.lang.Thread.run(Thread.java:745)
> [INFO]       [WARN] recompile failed
> [INFO]       [WARN] continuing to serve previous version
>
>
>
> Any idea on what to look for ?
>
> Thanks,
>    Alberto
>
>

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