GWT - 构造 Java AST 时出错

Question

编译过程中可能是什么原因导致此错误？

我已经从这个原型https://github.com/ArcBees/Arcbees-Archetypes生成了项目，并且我只更改了一件事 - 将 GWT 更新到 2.8.0，将 GWTP 更新到 1.5.3。

[INFO] [ERROR] An internal compiler exception occurred
[INFO] com.google.gwt.dev.jjs.InternalCompilerException: Error constructing Java AST
[INFO]  at com.google.gwt.dev.jjs.impl.GwtAstBuilder.translateException(GwtAstBuilder.java:3099)
[INFO]  at com.google.gwt.dev.jjs.impl.GwtAstBuilder$AstVisitor.endVisit(GwtAstBuilder.java:352)
[INFO]  at org.eclipse.jdt.internal.compiler.ast.AllocationExpression.traverse(AllocationExpression.java:670)
[INFO]  at org.eclipse.jdt.internal.compiler.ast.Assignment.traverse(Assignment.java:260)
[INFO]  at org.eclipse.jdt.internal.compiler.ast.MethodDeclaration.traverse(MethodDeclaration.java:347)
[INFO]  at org.eclipse.jdt.internal.compiler.ast.TypeDeclaration.traverse(TypeDeclaration.java:1379)
[INFO]  at com.google.gwt.dev.jjs.impl.GwtAstBuilder.process(GwtAstBuilder.java:3058)
[INFO]  at com.google.gwt.dev.javac.CompilationStateBuilder$CompileMoreLater$UnitProcessorImpl.process(CompilationStateBuilder.java:141)
[INFO]  at com.google.gwt.dev.javac.JdtCompiler$CompilerImpl.process(JdtCompiler.java:384)
[INFO]  at org.eclipse.jdt.internal.compiler.Compiler.compile(Compiler.java:470)
[INFO]  at com.google.gwt.dev.javac.JdtCompiler.doCompile(JdtCompiler.java:985)
[INFO]  at com.google.gwt.dev.javac.CompilationStateBuilder$CompileMoreLater.compile(CompilationStateBuilder.java:339)
[INFO]  at com.google.gwt.dev.javac.CompilationStateBuilder.doBuildFrom(CompilationStateBuilder.java:580)
[INFO]  at com.google.gwt.dev.javac.CompilationStateBuilder.buildFrom(CompilationStateBuilder.java:513)
[INFO]  at com.google.gwt.dev.javac.CompilationStateBuilder.buildFrom(CompilationStateBuilder.java:499)
[INFO]  at com.google.gwt.dev.cfg.ModuleDef.getCompilationState(ModuleDef.java:668)
[INFO]  at com.google.gwt.dev.Precompile.precompile(Precompile.java:255)
[INFO]  at com.google.gwt.dev.Precompile.precompile(Precompile.java:229)
[INFO]  at com.google.gwt.dev.Precompile.precompile(Precompile.java:145)
[INFO]  at com.google.gwt.dev.Compiler.run(Compiler.java:206)
[INFO]  at com.google.gwt.dev.Compiler.run(Compiler.java:158)
[INFO]  at com.google.gwt.dev.Compiler$1.run(Compiler.java:120)
[INFO]  at com.google.gwt.dev.CompileTaskRunner.doRun(CompileTaskRunner.java:55)
[INFO]  at com.google.gwt.dev.CompileTaskRunner.runWithAppropriateLogger(CompileTaskRunner.java:50)
[INFO]  at com.google.gwt.dev.Compiler.main(Compiler.java:127)
[INFO] Caused by: java.lang.NullPointerException
[INFO]  at com.google.gwt.dev.jjs.impl.ReferenceMapper.get(ReferenceMapper.java:99)
[INFO]  at com.google.gwt.dev.jjs.impl.GwtAstBuilder$AstVisitor.pushNewExpression(GwtAstBuilder.java:2642)
[INFO]  at com.google.gwt.dev.jjs.impl.GwtAstBuilder$AstVisitor.endVisit(GwtAstBuilder.java:350)
[INFO]  ... 23 more
[INFO]    [ERROR] at AbstractStringBuilder.java(137): new String(buffer)
[INFO]       org.eclipse.jdt.internal.compiler.ast.AllocationExpression
[INFO] Shutting down PersistentUnitCache thread

Answer 1

pom.xml 生成的 GWTP 原型对 gwt-dev-2.7.0 有隐式依赖，导致版本不匹配。尝试向 2.8.0 添加显式依赖项：

    <dependency>
        <groupId>com.google.gwt</groupId>
        <artifactId>gwt-dev</artifactId>
        <version>2.8.0</version>
        <scope>provided</scope>
    </dependency>