GWT compilation error

Question

I collect my project in GWT for any purpose. I get the following error on Linux and Solaris. I can compile the samples that come with GWT, but get this error.

I am using GWT 2.0.3 and JDK 1.6.17

 [java] Compiling module com.calix.ex1.webgui.ex1embeddedclient.Ex1EmbeddedGui
 [java] [ERROR] Unexpected
 [java] java.lang.NullPointerException
 [java]     at com.google.gwt.dev.javac.JdtCompiler$FindTypesInCud.visit(JdtCompiler.java:179)
 [java]     at org.eclipse.jdt.internal.compiler.ast.TypeDeclaration.traverse(TypeDeclaration.java:1253)
 [java]     at org.eclipse.jdt.internal.compiler.ast.QualifiedAllocationExpression.traverse(QualifiedAllocationExpression.java:478)
 [java]     at org.eclipse.jdt.internal.compiler.ast.ReturnStatement.traverse(ReturnStatement.java:262)
 [java]     at org.eclipse.jdt.internal.compiler.ast.MethodDeclaration.traverse(MethodDeclaration.java:239)
 [java]     at org.eclipse.jdt.internal.compiler.ast.TypeDeclaration.traverse(TypeDeclaration.java:1350)
 [java]     at org.eclipse.jdt.internal.compiler.ast.TypeDeclaration.traverse(TypeDeclaration.java:1223)
 [java]     at org.eclipse.jdt.internal.compiler.ast.CompilationUnitDeclaration.traverse(CompilationUnitDeclaration.java:687)
 [java]     at com.google.gwt.dev.javac.JdtCompiler$CompilerImpl.process(JdtCompiler.java:158)
 [java]     at org.eclipse.jdt.internal.compiler.Compiler.compile(Compiler.java:444)
 [java]     at com.google.gwt.dev.javac.JdtCompiler.doCompile(JdtCompiler.java:467)
 [java]     at com.google.gwt.dev.javac.CompilationStateBuilder$CompileMoreLater.compile(CompilationStateBuilder.java:142)
 [java]     at com.google.gwt.dev.javac.CompilationStateBuilder.doBuildFrom(CompilationStateBuilder.java:281)
 [java]     at com.google.gwt.dev.javac.CompilationStateBuilder.buildFrom(CompilationStateBuilder.java:182)
 [java]     at com.google.gwt.dev.cfg.ModuleDef.getCompilationState(ModuleDef.java:280)
 [java]     at com.google.gwt.dev.Precompile.precompile(Precompile.java:502)
 [java]     at com.google.gwt.dev.Precompile.precompile(Precompile.java:414)
 [java]     at com.google.gwt.dev.Compiler.run(Compiler.java:201)
 [java]     at com.google.gwt.dev.Compiler$1.run(Compiler.java:152)
 [java]     at com.google.gwt.dev.CompileTaskRunner.doRun(CompileTaskRunner.java:87)
 [java]     at com.google.gwt.dev.CompileTaskRunner.runWithAppropriateLogger(CompileTaskRunner.java:81)
 [java]     at com.google.gwt.dev.Compiler.main(Compiler.java:159)

Answer 1

Perhaps the answer is here: GWT Issue 4552

If you neglect to add imports for the anonymous class:

FocusPanel dropdown = new FocusPanel();
dropdown.addClickHandler(new BloggiDiBlook() {});

where the class BloggiDiBlook is not in the attached class, nor is it imported into the class <.java file. There must be a corresponding “class not found” or a similar compiler error. Instead, the JDT Compiler throws the following NullPointerException