Bug in developer preview
Vicente-Arturo Romero-Zaldivar
vicente.romero at oracle.com
Thu Sep 19 03:05:24 PDT 2013
Hi Marcos Antonio,
This seems to be an important bug, but the report is incomplete. Could
you please send me the whole class.
Also as a side comment, I think that using English identifiers makes the
code easier to understand by a wider audience, even if you don't speak
Portuguese ;)
Thanks,
Vicente
On 19/09/13 02:11, Marcos Antonio wrote:
> 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
>
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