Uploaded image for project: 'JDK'
  1. JDK
  2. JDK-8057800

Method reference with generic type creates NPE when compiling

    XMLWordPrintable

    Details

    • Subcomponent:
    • Resolved In Build:
      b37
    • CPU:
      x86_64
    • OS:
      linux
    • Verification:
      Verified

      Backports

        Description

        FULL PRODUCT VERSION :
        java version "1.8.0_20"
        Java(TM) SE Runtime Environment (build 1.8.0_20-b26)
        Java HotSpot(TM) 64-Bit Server VM (build 25.20-b23, mixed mode)


        ADDITIONAL OS VERSION INFORMATION :
        Linux version 3.13.0-35-generic (buildd@panlong) (gcc version 4.8.2 (Ubuntu 4.8.2-19ubuntu1) ) #62-Ubuntu SMP Fri Aug 15 01:58:42 UTC 2014

        A DESCRIPTION OF THE PROBLEM :
        The java compiler generates a NPE when trying to compile the given source.


        ERROR MESSAGES/STACK TRACES THAT OCCUR :
        $ javac Bug.java
        An exception has occurred in the compiler (1.8.0_20). 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.
        java.lang.NullPointerException
                at com.sun.tools.javac.code.Types.intersect(Types.java:3381)
                at com.sun.tools.javac.code.Types.lub(Types.java:3600)
                at com.sun.tools.javac.code.Types.lub(Types.java:3520)
                at com.sun.tools.javac.comp.Infer.getParameterizedSupers(Infer.java:624)
                at com.sun.tools.javac.comp.Infer.access$200(Infer.java:64)
                at com.sun.tools.javac.comp.Infer$IncorporationStep$7.apply(Infer.java:785)
                at com.sun.tools.javac.comp.Infer.checkWithinBounds(Infer.java:551)
                at com.sun.tools.javac.comp.Infer$GraphSolver.solve(Infer.java:1576)
                at com.sun.tools.javac.comp.Infer$InferenceContext.solve(Infer.java:2198)
                at com.sun.tools.javac.comp.Infer$InferenceContext.solve(Infer.java:2190)
                at com.sun.tools.javac.comp.Infer$InferenceContext.solve(Infer.java:2205)
                at com.sun.tools.javac.comp.Infer.instantiateMethod(Infer.java:186)
                at com.sun.tools.javac.comp.Resolve.rawInstantiate(Resolve.java:564)
                at com.sun.tools.javac.comp.Resolve.selectBest(Resolve.java:1431)
                at com.sun.tools.javac.comp.Resolve.findMethodInScope(Resolve.java:1618)
                at com.sun.tools.javac.comp.Resolve.findMethod(Resolve.java:1689)
                at com.sun.tools.javac.comp.Resolve.findMethod(Resolve.java:1662)
                at com.sun.tools.javac.comp.Resolve.findFun(Resolve.java:1822)
                at com.sun.tools.javac.comp.Resolve$8.doLookup(Resolve.java:2383)
                at com.sun.tools.javac.comp.Resolve$BasicLookupHelper.lookup(Resolve.java:3074)
                at com.sun.tools.javac.comp.Resolve.lookupMethod(Resolve.java:3325)
                at com.sun.tools.javac.comp.Resolve.lookupMethod(Resolve.java:3310)
                at com.sun.tools.javac.comp.Resolve.resolveMethod(Resolve.java:2379)
                at com.sun.tools.javac.comp.Attr.visitIdent(Attr.java:3170)
                at com.sun.tools.javac.tree.JCTree$JCIdent.accept(JCTree.java:2011)
                at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:607)
                at com.sun.tools.javac.comp.Attr.visitApply(Attr.java:1843)
                at com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1465)
                at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:607)
                at com.sun.tools.javac.comp.Attr.attribExpr(Attr.java:656)
                at com.sun.tools.javac.comp.Attr.visitExec(Attr.java:1611)
                at com.sun.tools.javac.tree.JCTree$JCExpressionStatement.accept(JCTree.java:1296)
                at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:607)
                at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:676)
                at com.sun.tools.javac.comp.Attr.attribStats(Attr.java:692)
                at com.sun.tools.javac.comp.Attr.visitBlock(Attr.java:1142)
                at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:909)
                at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:607)
                at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:676)
                at com.sun.tools.javac.comp.Attr.visitMethodDef(Attr.java:1035)
                at com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:778)
                at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:607)
                at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:676)
                at com.sun.tools.javac.comp.Attr.attribClassBody(Attr.java:4342)
                at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:4252)
                at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:4181)
                at com.sun.tools.javac.comp.Attr.attrib(Attr.java:4156)
                at com.sun.tools.javac.main.JavaCompiler.attribute(JavaCompiler.java:1248)
                at com.sun.tools.javac.main.JavaCompiler.compile2(JavaCompiler.java:901)
                at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:860)
                at com.sun.tools.javac.main.Main.compile(Main.java:523)
                at com.sun.tools.javac.main.Main.compile(Main.java:381)
                at com.sun.tools.javac.main.Main.compile(Main.java:370)
                at com.sun.tools.javac.main.Main.compile(Main.java:361)
                at com.sun.tools.javac.Main.compile(Main.java:56)
                at com.sun.tools.javac.Main.main(Main.java:42)


        REPRODUCIBILITY :
        This bug can be reproduced always.

        ---------- BEGIN SOURCE ----------
        public class Bug {
        public <T> void foo(java.util.Comparator<? super T> comparator) {
        }
        public <C extends Comparable<? super C>> void foo() {
        foo(C::compareTo);
        }
        }
        ---------- END SOURCE ----------

          Attachments

            Issue Links

              Activity

                People

                Assignee:
                vromero Vicente Arturo Romero Zaldivar
                Reporter:
                webbuggrp Webbug Group
                Votes:
                0 Vote for this issue
                Watchers:
                4 Start watching this issue

                  Dates

                  Created:
                  Updated:
                  Resolved: