Question

当我尝试在Eclipse中将我的Libgdx游戏编译为HTML5时，我遇到了这些奇怪的错误。

Tracing compile failure path for type 'java.util.function.DoubleUnaryOperator'
     [ERROR] Errors in 'com/google/gwt/emul/java/util/function/DoubleUnaryOperator.java'
     [ERROR] Line 33: Default methods are allowed only at source level 1.8 or above
     [ERROR] Line 35: Cannot refer to the non-final local variable after defined in an enclosing scope
     [ERROR] Line 40: Cannot refer to the non-final local variable before defined in an enclosing scope
     [ERROR] Line 40: Lambda expressions are allowed only at source level 1.8 or above
     [ERROR] Line 35: Lambda expressions are allowed only at source level 1.8 or above
     [ERROR] Line 38: Default methods are allowed only at source level 1.8 or above
     [ERROR] Line 27: Illegal modifier for the interface method identity; only public & abstract are permitted
     [ERROR] Line 27: Static methods are allowed in interfaces only at source level 1.8 or above
     [ERROR] Line 28: Lambda expressions are allowed only at source level 1.8 or above
Tracing compile failure path for type 'java.util.stream.Collectors'
  [ERROR] Errors in 'com/google/gwt/emul/java/util/stream/Collectors.java'
     [ERROR] Line 291: This static method of interface Collector can only be accessed as Collector.of
     [ERROR] Line 348: Lambda expressions are allowed only at source level 1.8 or above
     [ERROR] Line 96: Lambda expressions are allowed only at source level 1.8 or above
     [ERROR] Line 223: The method of(Supplier<R>, BiConsumer<R,T>, BinaryOperator<R>, Collector.Characteristics...) in the type Collector is not applicable for the arguments (() -> {}, (<no type> u, <no type> t) -> {}, (Object[] u1, Object[] u2) -> {}, (Object[] a) -> {})
     [ERROR] Line 311: Constructor references are allowed only at source level 1.8 or above
     [ERROR] Line 192: Method references are allowed only at source level 1.8 or above
     [ERROR] Line 205: Lambda expressions are allowed only at source level 1.8 or above
     [ERROR] Line 143: Constructor references are allowed only at source level 1.8 or above
     [ERROR] Line 168: Lambda expressions are allowed only at source level 1.8 or above
     [ERROR] Line 339: Lambda expressions are allowed only at source level 1.8 or above...

在我的build.gradle中，我检查过gwtVersion是使用2.7.0而我的sourceCompatibility是1.8。我已经做了好几天了，我似乎无法弄明白。

帮助!!!

已更新

感谢科林的反馈。这是我现在得到的错误：

[ERROR]发生内部编译器异常 com.google.gwt.dev.jjs.InternalCompilerException：构造Java AST时出错在com.google.gwt.dev.jjs.impl.GwtAstBuilder.translateException（GwtAstBuilder.java:3099）在com.google.gwt.dev.jjs.impl.GwtAstBuilder $ AstVisitor.endVisit（GwtAstBuilder.java:352）在org.eclipse.jdt.internal.compiler.ast.AllocationExpression.traverse（AllocationExpression.java:670） at org.eclipse.jdt.internal.compiler.ast.ReturnStatement.traverse（ReturnStatement.java:373）在org.eclipse.jdt.internal.compiler.ast.MethodDeclaration.traverse（MethodDeclaration.java:347）在org.eclipse.jdt.internal.compiler.ast.TypeDeclaration.traverse（TypeDeclaration.java:1379）在com.google.gwt.dev.jjs.impl.GwtAstBuilder.process(GwtAstBuilder.java:3058）在com.google.gwt.dev.javac.CompilationStateBuilder $ CompileMoreLater $ UnitProcessorImpl.process（CompilationStateBuilder.java:141）在com.google.gwt.dev.javac.JdtCompiler $ CompilerImpl.process（JdtCompiler.java:384）在org.eclipse.jdt.internal.compiler.Compiler.compile（Compiler.java:470）在com.google.gwt.dev.javac.JdtCompiler.doCompile（JdtCompiler.java:985）在com.google.gwt.dev.javac.CompilationStateBuilder $ CompileMoreLater.compile（CompilationStateBuilder.java:339）在com.google.gwt.dev.javac.CompilationStateBuilder.doBuildFrom（CompilationStateBuilder.java:580）在com.google.gwt.dev.javac.CompilationStateBuilder.buildFrom（CompilationStateBuilder.java:513）在com.google.gwt.dev.javac.CompilationStateBuilder.buildFrom（CompilationStateBuilder.java:499）在com.google.gwt.dev.cfg.ModuleDef.getCompilationState（ModuleDef.java:668）在com.google.gwt.dev.Precompile.precompile（Precompile.java:255）在com.google.gwt.dev.Precompile.precompile（Precompile.java:229）在com.google.gwt.dev.Precompile.precompile（Precompile.java:145）在com.google.gwt.dev.Compiler.run（Compiler.java:206）在com.google.gwt.dev.Compiler.run（Compiler.java:158）在com.google.gwt.dev.Compiler $ 1.run（Compiler.java:120）在com.google.gwt.dev.CompileTaskRunner.doRun（CompileTaskRunner.java:55）在com.google.gwt.dev.CompileTaskRunner.runWithAppropriateLogger（CompileTaskRunner.java:50）在com.google.gwt.dev.Compiler.main（Compiler.java:127）引起：java.lang.NullPointerException 在com.google.gwt.dev.jjs.impl.ReferenceMapper.get（ReferenceMapper.java:99）在com.google.gwt.dev.jjs.impl.GwtAstBuilder $ AstVisitor.pushNewExpression（GwtAstBuilder.java:2642）在com.google.gwt.dev.jjs.impl.GwtAstBuilder $ AstVisitor.endVisit（GwtAstBuilder.java:350） ......还有23个 TimeZone.java的[错误]（126）：new String（data） org.eclipse.jdt.internal.compiler.ast.AllocationExpression

也许我必须将它更新为GWT 2.8.0？

P.S：在我的html \ war \ WEB-INF \ lib目录中，我有以下jar：

这个设置是否正确？

更新：

现在更新为GWT 2.8.1。现在我收到以下错误：

Exception in thread "main" java.lang.NoSuchMethodError: com.google.gwt.util.regexfilter.RegexFilter: method <init>()V not found
at com.google.gwt.util.regexfilter.WhitelistRegexFilter.<init>(WhitelistRegexFilter.java:21)
at com.google.gwt.dev.jjs.JJSOptionsImpl.<init>(JJSOptionsImpl.java:54)
at com.google.gwt.dev.PrecompileTaskOptionsImpl.<init>(PrecompileTaskOptionsImpl.java:39)
at com.google.gwt.dev.CompilerOptionsImpl.<init>(CompilerOptionsImpl.java:30)
at com.google.gwt.dev.Compiler.main(Compiler.java:108)

我应该清理我的html \ war \ WEB-INF \ lib目录中的（或某些）罐子并使用其他罐子吗？

Answer 1

如果您使用的是GWT 2.7，则无法使用Java8。如果要使用Java 8，请升级到GWT 2.8（或更好，2.8.1）。

也就是说，如果您正在查找这些类，那么它表明您已经在类路径上有部分的GWT 2.8，并且每个版本的GWT混合了一些碎片并没有赢得结束好。最好将所有内容升级到最新版本，2.8.1。

Eclipse Oxygen

1 个答案: