java库源在SuperDevMode中不可用

Question

我创建了一个演示项目here

它使用GWT编译，没有任何来自Eclipse的问题。在SuperDevMode中运行应用程序时，第一次编译失败，出现以下错误：

        Compiling 1 permutation
            Compiling permutation 0...
            [ERROR] An internal compiler exception occurred
com.google.gwt.dev.jjs.InternalCompilerException: Unexpected error during visit.
    at com.google.gwt.dev.jjs.ast.JVisitor.translateException(JVisitor.java:121)
    at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:140)
    at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:132)
    at com.google.gwt.dev.jjs.impl.Devirtualizer.getStaticImpl(Devirtualizer.java:562)
    at com.google.gwt.dev.jjs.impl.Devirtualizer.access$400(Devirtualizer.java:75)
    at com.google.gwt.dev.jjs.impl.Devirtualizer$RewriteVirtualDispatches.ensureDevirtualVersionExists(Devirtualizer.java:184)
    at com.google.gwt.dev.jjs.impl.Devirtualizer$RewriteVirtualDispatches.endVisit(Devirtualizer.java:101)
    at com.google.gwt.dev.jjs.ast.JMethod.traverse(JMethod.java:580)
    at com.google.gwt.dev.jjs.ast.JModVisitor$ListContextImmutable.traverse(JModVisitor.java:183)
    at com.google.gwt.dev.jjs.ast.JModVisitor.acceptWithInsertRemoveImmutable(JModVisitor.java:355)
    at com.google.gwt.dev.jjs.ast.JInterfaceType.traverse(JInterfaceType.java:75)
    at com.google.gwt.dev.jjs.ast.JModVisitor.traverse(JModVisitor.java:380)
    at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:292)
    at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:284)
    at com.google.gwt.dev.jjs.ast.JProgram.visitModuleTypes(JProgram.java:1192)
    at com.google.gwt.dev.jjs.ast.JProgram.traverse(JProgram.java:1156)
    at com.google.gwt.dev.jjs.ast.JModVisitor.traverse(JModVisitor.java:380)
    at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:292)
    at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:284)
    at com.google.gwt.dev.jjs.impl.Devirtualizer.execImpl(Devirtualizer.java:320)
    at com.google.gwt.dev.jjs.impl.Devirtualizer.exec(Devirtualizer.java:218)
    at com.google.gwt.dev.jjs.MonolithicJavaToJavaScriptCompiler$MonolithicPermutationCompiler.normalizeSemantics(MonolithicJavaToJavaScriptCompiler.java:95)
    at com.google.gwt.dev.jjs.JavaToJavaScriptCompiler$PermutationCompiler.compilePermutation(JavaToJavaScriptCompiler.java:290)
    at com.google.gwt.dev.jjs.MonolithicJavaToJavaScriptCompiler.compilePermutation(MonolithicJavaToJavaScriptCompiler.java:296)
    at com.google.gwt.dev.jjs.UnifiedAst.compilePermutation(UnifiedAst.java:143)
    at com.google.gwt.dev.CompilePerms.compile(CompilePerms.java:197)
    at com.google.gwt.dev.ThreadedPermutationWorkerFactory$ThreadedPermutationWorker.compile(ThreadedPermutationWorkerFactory.java:50)
    at com.google.gwt.dev.PermutationWorkerFactory$Manager$WorkerThread.run(PermutationWorkerFactory.java:74)
    at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NullPointerException
    at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:137)
    ... 27 more
               [ERROR] <no source info>: <source info not available>
               [ERROR] at JsonElement.java(19): public abstract JsonElement clear();

                  com.google.gwt.dev.jjs.ast.JMethod
               [ERROR] at JsonElement.java(18): interface JsonElement extends Serializable 
                  com.google.gwt.dev.jjs.ast.JInterfaceType
               [ERROR] at Unknown(0): <JProgram>
                  com.google.gwt.dev.jjs.ast.JProgram
            [ERROR] Unrecoverable exception, shutting down
com.google.gwt.core.ext.UnableToCompleteException: (see previous log entries)
    at com.google.gwt.dev.javac.CompilationProblemReporter.logAndTranslateException(CompilationProblemReporter.java:106)
    at com.google.gwt.dev.jjs.JavaToJavaScriptCompiler$PermutationCompiler.compilePermutation(JavaToJavaScriptCompiler.java:367)
    at com.google.gwt.dev.jjs.MonolithicJavaToJavaScriptCompiler.compilePermutation(MonolithicJavaToJavaScriptCompiler.java:296)
    at com.google.gwt.dev.jjs.UnifiedAst.compilePermutation(UnifiedAst.java:143)
    at com.google.gwt.dev.CompilePerms.compile(CompilePerms.java:197)
    at com.google.gwt.dev.ThreadedPermutationWorkerFactory$ThreadedPermutationWorker.compile(ThreadedPermutationWorkerFactory.java:50)
    at com.google.gwt.dev.PermutationWorkerFactory$Manager$WorkerThread.run(PermutationWorkerFactory.java:74)
    at java.lang.Thread.run(Thread.java:745)
            [ERROR] Not all permutation were compiled , completed (0/1)
      [WARN] recompile failed
      [WARN] continuing to serve previous version

库使用<super-source path="super" />标记。从我找到的GWT文档（http://www.gwtproject.org/doc/latest/DevGuideOrganizingProjects.html）

在开发模式下，本机JRE类始终取代从源代码编译的类

这是一个问题，因为我无法在SuperDevMode中使用lib

有什么办法可以解决这个问题吗？我能以某种方式省略super source标记吗

Answer 1

您使用的java代码不是为GWT准备的，问题似乎是JsonElement，它可能来自com.google.gson，这是一个与GWT不兼容的库

您可以阅读GWT编码compatibilty和jre仿真文档

Answer 2

如果可能有帮助，我也遇到了类似的问题，因为匿名类中有一个static字段（String）；尽管这在标准和GWT仿真JDK中都被接受，但它似乎会在SuperDevMode启动时导致上述com.google.gwt.dev.jjs.InternalCompilerException（我使用的是GWT 2.7.0）。仅仅将有问题的字段移出匿名类就足以消除异常