GWT 2.8 Compiler Question for Streams

[Paul Mazzuca]

Any reason why I would be receiving a compiler error in the code below?

//compiles

this.mybutton.addClickHandler(c -> dosomething());

//does not compile

Arrays.asList("one", "two").stream();

I am using the beta Maven release of GWT 2.8 with jdk 1.8.0_60  and am using super dev mode.  

This is either a compiler bug or a Generator has legitimately stopped creating these types.

[INFO]          Compiling 1 permutation

[INFO]             Compiling permutation 0...

[INFO]             [ERROR] An internal compiler exception occurred

[INFO] com.google.gwt.dev.jjs.InternalCompilerException: Unexpected error during visit.

[INFO] at com.google.gwt.dev.jjs.ast.JVisitor.translateException(JVisitor.java:111)

[INFO] at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:130)

[INFO] at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:122)

[INFO] at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:118)

[INFO] at com.google.gwt.dev.jjs.ast.JReturnStatement.traverse(JReturnStatement.java:40)

[INFO] at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:146)

[INFO] at com.google.gwt.dev.jjs.ast.JVisitor.acceptWithInsertRemove(JVisitor.java:168)

[INFO] at com.google.gwt.dev.jjs.ast.JBlock.traverse(JBlock.java:92)

[INFO] at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:127)

[INFO] at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:139)

[INFO] at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:135)

[INFO] at com.google.gwt.dev.jjs.ast.JMethodBody.traverse(JMethodBody.java:83)

[INFO] at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:127)

[INFO] at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:122)

[INFO] at com.google.gwt.dev.jjs.ast.JMethod.visitChildren(JMethod.java:730)

[INFO] at com.google.gwt.dev.jjs.ast.JMethod.traverse(JMethod.java:722)

[INFO] at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:146)

[INFO] at com.google.gwt.dev.jjs.ast.JVisitor.acceptWithInsertRemoveImmutable(JVisitor.java:172)

[INFO] at com.google.gwt.dev.jjs.ast.JClassType.traverse(JClassType.java:142)

[INFO] at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:127)

[INFO] at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:122)

[INFO] at com.google.gwt.dev.jjs.ast.JProgram.visitModuleTypes(JProgram.java:1288)

[INFO] at com.google.gwt.dev.jjs.ast.JProgram.traverse(JProgram.java:1253)

[INFO] at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:127)

[INFO] at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:122)

[INFO] at com.google.gwt.dev.jjs.impl.ControlFlowRecorder.execImpl(ControlFlowRecorder.java:163)

[INFO] at com.google.gwt.dev.jjs.impl.ControlFlowRecorder.exec(ControlFlowRecorder.java:46)

[INFO] at com.google.gwt.dev.jjs.JavaToJavaScriptCompiler.maybeRecordReferencesAndControlFlow(JavaToJavaScriptCompiler.java:474)

[INFO] at com.google.gwt.dev.jjs.JavaToJavaScriptCompiler.compilePermutation(JavaToJavaScriptCompiler.java:352)

[INFO] at com.google.gwt.dev.jjs.JavaToJavaScriptCompiler.compilePermutation(JavaToJavaScriptCompiler.java:272)

[INFO] at com.google.gwt.dev.CompilePerms.compile(CompilePerms.java:198)

[INFO] at com.google.gwt.dev.ThreadedPermutationWorkerFactory$ThreadedPermutationWorker.compile(ThreadedPermutationWorkerFactory.java:50)

[INFO] at com.google.gwt.dev.PermutationWorkerFactory$Manager$WorkerThread.run(PermutationWorkerFactory.java:74)

[INFO] at java.lang.Thread.run(Thread.java:745)

[INFO] Caused by: java.lang.NullPointerException

[INFO] at com.google.gwt.dev.jjs.ast.JMethod.getJsniSignature(JMethod.java:560)

[INFO] at com.google.gwt.dev.jjs.impl.ControlFlowRecorder.computeName(ControlFlowRecorder.java:50)

[INFO] at com.google.gwt.dev.jjs.impl.ControlFlowRecorder.processMethodCall(ControlFlowRecorder.java:195)

[INFO] at com.google.gwt.dev.jjs.impl.ControlFlowRecorder.visit(ControlFlowRecorder.java:158)

[INFO] at com.google.gwt.dev.jjs.ast.JVisitor.visit(JVisitor.java:683)

[INFO] at com.google.gwt.dev.jjs.ast.JNewInstance.traverse(JNewInstance.java:73)

[INFO] at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:127)

[INFO] ... 32 more

[Juan Pablo Gardella]

stream() method is not mentioned in http://www.gwtproject.org/doc/latest/RefJreEmulation.html#Package_java_util. Maybe this is the reason.

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[Paul Mazzuca]

That reference is for the "latest", which I am assuming is still for 2.7, not 2.8?

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[Juan Pablo Gardella]

I think it's not supported in GWT 2.8:

- https://groups.google.com/forum/#!topic/google-web-toolkit/SuLcOTeJkyo

- http://stackoverflow.com/questions/15693169/java-8-support-in-gwt

[Paul Mazzuca]

It appears that you are correct.  I misread the posts the first time I searched. Thanks for the quick clarification.

[Pablo Nussembaum]

You can still use Guava functional idioms in particular FluentIterable [1] gives you a more java8 feeling

[1] http://google.github.io/guava/releases/snapshot/api/docs/com/google/common/collect/FluentIterable.html