Widgetset Compiling fails with Null Pointer

Vaadin 6 / 7 / 8
1

Hi All,

I have a project under Vaadin 7 (was 7.1.8 and just updated to 7.1.9). I am now having problems building the widgetset.
Here is the error message:
Starting GWT compiler
Compiling module com.paragoninformation.phoenix.widgetset.PhoenixWidgetset
[ERROR]
Unexpected internal compiler error
java.lang.NullPointerException
at com.google.gwt.dev.javac.JsniChecker.getSuppressedWarnings(JsniChecker.java:565)
at com.google.gwt.dev.javac.JsniChecker$JsniDeclChecker.visit(JsniChecker.java:135)
at org.eclipse.jdt.internal.compiler.ast.TypeDeclaration.traverse(TypeDeclaration.java:1272)
at org.eclipse.jdt.internal.compiler.ast.CompilationUnitDeclaration.traverse(CompilationUnitDeclaration.java:689)
at com.google.gwt.dev.javac.JsniChecker.check(JsniChecker.java:615)
at com.google.gwt.dev.javac.JsniChecker.check(JsniChecker.java:559)
at com.google.gwt.dev.javac.CompilationStateBuilder$CompileMoreLater$UnitProcessorImpl.process(CompilationStateBuilder.java:83)
at com.google.gwt.dev.javac.JdtCompiler$CompilerImpl.process(JdtCompiler.java:452)
at org.eclipse.jdt.internal.compiler.Compiler.compile(Compiler.java:468)
at com.google.gwt.dev.javac.JdtCompiler.doCompile(JdtCompiler.java:941)
at com.google.gwt.dev.javac.CompilationStateBuilder$CompileMoreLater.compile(CompilationStateBuilder.java:276)
at com.google.gwt.dev.javac.CompilationStateBuilder.doBuildFrom(CompilationStateBuilder.java:499)
at com.google.gwt.dev.javac.CompilationStateBuilder.buildFrom(CompilationStateBuilder.java:423)
at com.google.gwt.dev.cfg.ModuleDef.getCompilationState(ModuleDef.java:373)
at com.google.gwt.dev.Precompile.precompile(Precompile.java:246)
at com.google.gwt.dev.Precompile.precompile(Precompile.java:229)
at com.google.gwt.dev.Precompile.precompile(Precompile.java:141)
at com.google.gwt.dev.Compiler.run(Compiler.java:232)
at com.google.gwt.dev.Compiler.run(Compiler.java:198)
at com.google.gwt.dev.Compiler$1.run(Compiler.java:170)
at com.google.gwt.dev.CompileTaskRunner.doRun(CompileTaskRunner.java:88)
at com.google.gwt.dev.CompileTaskRunner.runWithAppropriateLogger(CompileTaskRunner.java:82)
at com.google.gwt.dev.Compiler.main(Compiler.java:177)
at com.vaadin.tools.WidgetsetCompiler$1.run(WidgetsetCompiler.java:80)
at java.lang.Thread.run(Unknown Source)
Widgetset compilation failed

Any help welcome.
Thank you!

2

I’d recommend first removing your GWT unit cache directory and trying again. It could be that GWT has stale cached precompiled data.

If that does not help, try to reduce your widgetset by disabling modules until you find what causes this. Perhaps there is an invalid JSNI method (native JavaScript) somewhere or something like that.