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  1. JDK
  2. JDK-4440249

NullPointerException when compiling bad fieldaccess

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    • Subcomponent:
    • Resolved In Build:
      hopper
    • CPU:
      generic, x86
    • OS:
      generic, windows_nt

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        Description



        Name: boT120536 Date: 04/11/2001


        java version "1.3.1-beta"
        Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.1-beta-b15)
        Java HotSpot(TM) Client VM (build 1.3.1beta-b15, mixed mode)

        As per JLS 15.11.1, javac gives a compile time error when the identifier in a
        field reference does not denote a field in the type of the qualifying primary
        expression. However, don't you think a NullPointerException is a little harsh?

        $ cat T15111i1.java
        class T15111i1 {
            static class A {
                static class B {
                    static int i = 1;
                }
            }
            int j = new A().B.i;
        }
        $ javac T15111i1.java
        An exception has occurred in the compiler (1.3.1-beta). Please file a bug at
        the Java Developer Connection (http://java.sun.com/cgi-bin/bugreport.cgi).
        Include your program and the following diagnostic in your report. Thank you.
        java.lang.NullPointerException
                at com.sun.tools.javac.v8.comp.TransInner.access(TransInner.java:743)
                at com.sun.tools.javac.v8.comp.TransInner._case(TransInner.java:1578)
                at com.sun.tools.javac.v8.tree.Tree$Select.visit(Tree.java:963)
                at com.sun.tools.javac.v8.tree.TreeTranslator.translate(TreeTranslator.java:35)
                at com.sun.tools.javac.v8.comp.TransInner._case(TransInner.java:1572)
                at com.sun.tools.javac.v8.tree.Tree$Select.visit(Tree.java:963)
                at com.sun.tools.javac.v8.tree.TreeTranslator.translate(TreeTranslator.java:35)
                at com.sun.tools.javac.v8.tree.TreeTranslator._case(TreeTranslator.java:106)
                at com.sun.tools.javac.v8.tree.Tree$VarDef.visit(Tree.java:470)
                at com.sun.tools.javac.v8.tree.TreeTranslator.translate(TreeTranslator.java:35)
                at com.sun.tools.javac.v8.comp.TransInner._case(TransInner.java:1373)
                at com.sun.tools.javac.v8.tree.Tree$ClassDef.visit(Tree.java:402)
                at com.sun.tools.javac.v8.tree.TreeTranslator.translate(TreeTranslator.java:35)
                at com.sun.tools.javac.v8.comp.TransInner.translate(TransInner.java:1335)
                at com.sun.tools.javac.v8.comp.TransInner.translateTopLevelClass(TransInner.java:16
        03)
                at com.sun.tools.javac.v8.JavaCompiler.compile(JavaCompiler.java:397)
                at com.sun.tools.javac.v8.Main.compile(Main.java:247)
                at com.sun.tools.javac.Main.main(Main.java:16)

        Also, notice that this variation gives an error message, but that the message is
        totally unrelated to the required one (since B is not a field of type A):
        $ cat T15111i1.java
        class T15111i1 {
            static class A {
                static class B {
                    int i = 1;
                }
            }
            int j = new A().B.i;
        }
        $ javac T15111i1.java
        T15111i1.java:7: non-static variable i cannot be referenced from a static
        context
            int j = new A().B.i;
                    ^
        1 error
        (Review ID: 120455)
        ======================================================================

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                Assignee:
                gafter Neal Gafter
                Reporter:
                bonealsunw Bret O'neal (Inactive)
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