Bug in developer preview

[Marcos Antonio]

I'm using JDK 8 Developer Preview (b106)

First I had this code in a class of mine:

private void ordenar()
{
    final Comparator<T> ORDEM_CRESCENTE =
        new Comparator<T>()
        {
            @Override
            public int compare(T entidade1, T entidade2)
            {
                Object valor1 = obterValorPropriedadeOrdem(entidade1);
                Object valor2 = obterValorPropriedadeOrdem(entidade2);
                return comparar(valor1, valor2);
            }
    
            private Object obterValorPropriedadeOrdem(T entidade)
            {
                EstruturaEntidade estruturaEntidade =
                    _estruturasEntidadesAtuais.get(entidade);
                PropriedadeObjeto propriedadeObjeto =
                    estruturaEntidade.propriedadesObjetos.get(
                    _nomePropriedadeOrdem);
                return propriedadeObjeto.getValor();
            }
            @SuppressWarnings("unchecked")
            private <V> int comparar(V valor1, V valor2)
            {
                if (valor1 != null && valor2 != null)
                {
                    return ((Comparable<V>) valor1).compareTo(valor2);
                }
                else
                {
                    return valor1 == valor2 ? 0 : (valor1 == null ? 1 : -1);
                }
            }
    };
  
    _entidades.sort(ORDEM_CRESCENTE);
    // ...
}

Then I tried to convert it to use lambda expression:

private void ordenar()
{
    final Comparator<T> ORDEM_CRESCENTE =
        nullsFirst(comparing(e -> obterValorPropriedadeOrdem(e)));
  
    _entidades.sort(ORDEM_CRESCENTE);
    // ...
}

@SuppressWarnings("unchecked")
private <V extends Comparable<? super V>> V obterValorPropriedadeOrdem(T entidade)
{
    EstruturaEntidade estruturaEntidade =
        _estruturasEntidadesAtuais.get(entidade);
    PropriedadeObjeto propriedadeObjeto =
        estruturaEntidade.propriedadesObjetos.get(
        _nomePropriedadeOrdem);
    return (V) propriedadeObjeto.getValor();
}

Now I get this error when I compile:

    [javac] An exception has occurred in the compiler (1.8.0-ea). Please file a bug at the Java Developer Connection (http://java.sun.com/webapps/bugreport)  after checking the Bug Parade for duplicates. Include your program and the following diagnostic in your report.  Thank you.
    [javac] java.lang.NullPointerException
    [javac]  at com.sun.tools.javac.code.Types$DescriptorCache.get(Types.java:392)
    [javac]  at com.sun.tools.javac.code.Types.findDescriptorSymbol(Types.java:563)
    [javac]  at com.sun.tools.javac.code.Types.isFunctionalInterface(Types.java:579)
    [javac]  at com.sun.tools.javac.code.Types.functionalInterfaceBridges(Types.java:662)
    [javac]  at com.sun.tools.javac.comp.LambdaToMethod$LambdaAnalyzerPreprocessor$TranslationContext.<init>(LambdaToMethod.java:1669)
    [javac]  at com.sun.tools.javac.comp.LambdaToMethod$LambdaAnalyzerPreprocessor$LambdaTranslationContext.<init>(LambdaToMethod.java:1722)
    [javac]  at com.sun.tools.javac.comp.LambdaToMethod$LambdaAnalyzerPreprocessor.makeLambdaContext(LambdaToMethod.java:1618)
    [javac]  at com.sun.tools.javac.comp.LambdaToMethod$LambdaAnalyzerPreprocessor.visitLambda(LambdaToMethod.java:1213)
    [javac]  at com.sun.tools.javac.tree.JCTree$JCLambda.accept(JCTree.java:1619)
    [javac]  at com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:58)
    [javac]  at com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:70)
    [javac]  at com.sun.tools.javac.tree.TreeTranslator.visitApply(TreeTranslator.java:275)
    [javac]  at com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1459)
    [javac]  at com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:58)
    [javac]  at com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:70)
    [javac]  at com.sun.tools.javac.tree.TreeTranslator.visitApply(TreeTranslator.java:275)
    [javac]  at com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1459)
    [javac]  at com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:58)
    [javac]  at com.sun.tools.javac.tree.TreeTranslator.visitVarDef(TreeTranslator.java:153)
    [javac]  at com.sun.tools.javac.comp.LambdaToMethod$LambdaAnalyzerPreprocessor.visitVarDef(LambdaToMethod.java:1381)
    [javac]  at com.sun.tools.javac.tree.JCTree$JCVariableDecl.accept(JCTree.java:846)
    [javac]  at com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:58)
    [javac]  at com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:70)
    [javac]  at com.sun.tools.javac.tree.TreeTranslator.visitBlock(TreeTranslator.java:162)
    [javac]  at com.sun.tools.javac.comp.LambdaToMethod$LambdaAnalyzerPreprocessor.visitBlock(LambdaToMethod.java:1123)
    [javac]  at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:903)
    [javac]  at com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:58)
    [javac]  at com.sun.tools.javac.tree.TreeTranslator.visitMethodDef(TreeTranslator.java:145)
    [javac]  at com.sun.tools.javac.comp.LambdaToMethod$LambdaAnalyzerPreprocessor.visitMethodDef(LambdaToMethod.java:1233)
    [javac]  at com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:772)
    [javac]  at com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:58)
    [javac]  at com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:70)
    [javac]  at com.sun.tools.javac.tree.TreeTranslator.visitClassDef(TreeTranslator.java:134)
    [javac]  at com.sun.tools.javac.comp.LambdaToMethod$LambdaAnalyzerPreprocessor.visitClassDef(LambdaToMethod.java:1160)
    [javac]  at com.sun.tools.javac.tree.JCTree$JCClassDecl.accept(JCTree.java:687)
    [javac]  at com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:58)
    [javac]  at com.sun.tools.javac.comp.LambdaToMethod$LambdaAnalyzerPreprocessor.analyzeAndPreprocessClass(LambdaToMethod.java:1113)
    [javac]  at com.sun.tools.javac.comp.LambdaToMethod$LambdaAnalyzerPreprocessor.access$300(LambdaToMethod.java:1083)
    [javac]  at com.sun.tools.javac.comp.LambdaToMethod.visitClassDef(LambdaToMethod.java:218)
    [javac]  at com.sun.tools.javac.tree.JCTree$JCClassDecl.accept(JCTree.java:687)
    [javac]  at com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:58)
    [javac]  at com.sun.tools.javac.comp.LambdaToMethod.translate(LambdaToMethod.java:183)
    [javac]  at com.sun.tools.javac.comp.LambdaToMethod.translate(LambdaToMethod.java:176)
    [javac]  at com.sun.tools.javac.comp.LambdaToMethod.translateTopLevelClass(LambdaToMethod.java:203)
    [javac]  at com.sun.tools.javac.main.JavaCompiler.desugar(JavaCompiler.java:1465)
    [javac]  at com.sun.tools.javac.main.JavaCompiler.desugar(JavaCompiler.java:1350)
    [javac]  at com.sun.tools.javac.main.JavaCompiler.compile2(JavaCompiler.java:900)
    [javac]  at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:859)
    [javac]  at com.sun.tools.javac.main.Main.compile(Main.java:523)
    [javac]  at com.sun.tools.javac.main.Main.compile(Main.java:381)
    [javac]  at com.sun.tools.javac.main.Main.compile(Main.java:370)
    [javac]  at com.sun.tools.javac.main.Main.compile(Main.java:361)
    [javac]  at com.sun.tools.javac.Main.compile(Main.java:64)
    [javac]  at com.sun.tools.javac.Main.main(Main.java:50)

Sorry if I can't give you a simpler example, but I think you can come up with something simple and similar.

Marcos