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  1. JDK
  2. JDK-6244020

java.lang.NullPointerException when given bad generics code

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    • Icon: Bug Bug
    • Resolution: Duplicate
    • Icon: P3 P3
    • None
    • 5.0
    • tools
    • x86
    • windows_xp

      FULL PRODUCT VERSION :
      java version "1.5.0_02"
      Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_02-b09)
      Java HotSpot(TM) Client VM (build 1.5.0_02-b09, mixed mode, sharing)


      ADDITIONAL OS VERSION INFORMATION :
      Windows XP Pro

      EXTRA RELEVANT SYSTEM CONFIGURATION :
      Normal PC

      A DESCRIPTION OF THE PROBLEM :
      Compiler should NOT crash even when given bad source code.

      STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
      Compile the given source code, will crash compiler every time.

      EXPECTED VERSUS ACTUAL BEHAVIOR :
      EXPECTED -
      Compilers should not crash, the parser should have noticed the mistake and reported it.
      ACTUAL -
      The compiler crashed.

      ERROR MESSAGES/STACK TRACES THAT OCCUR :
      An exception has occurred in the compiler (1.5.0_02). 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.comp.Attr.visitNewClass(Attr.java:1352)
      at com.sun.tools.javac.tree.Tree$NewClass.accept(Tree.java:845)
      at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:280)
      at com.sun.tools.javac.comp.Attr.attribArgs(Attr.java:339)
      at com.sun.tools.javac.comp.Attr.visitApply(Attr.java:1105)
      at com.sun.tools.javac.tree.Tree$Apply.accept(Tree.java:819)
      at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:280)
      at com.sun.tools.javac.comp.Attr.attribExpr(Attr.java:302)
      at com.sun.tools.javac.comp.Attr.visitExec(Attr.java:896)
      at com.sun.tools.javac.tree.Tree$Exec.accept(Tree.java:734)
      at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:280)
      at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:315)
      at com.sun.tools.javac.comp.Attr.attribStats(Attr.java:331)
      at com.sun.tools.javac.comp.Attr.visitBlock(Attr.java:599)
      at com.sun.tools.javac.tree.Tree$Block.accept(Tree.java:540)
      at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:280)
      at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:315)
      at com.sun.tools.javac.comp.Attr.visitMethodDef(Attr.java:532)
      at com.sun.tools.javac.tree.Tree$MethodDef.accept(Tree.java:482)
      at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:280)
      at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:315)
      at com.sun.tools.javac.comp.Attr.attribClassBody(Attr.java:2473)
      at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:2406)
      at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:2355)
      at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:444)
      at com.sun.tools.javac.main.Main.compile(Main.java:592)
      at com.sun.tools.javac.main.Main.compile(Main.java:544)
      at com.sun.tools.javac.Main.compile(Main.java:67)
      at com.sun.tools.javac.Main.main(Main.java:52)


      REPRODUCIBILITY :
      This bug can be reproduced always.

      ---------- BEGIN SOURCE ----------
      import java.util.*;
      import java.util.Comparator;

      public class Test
      {
          public static void main(String args[])
          {
              String[] stringArray = {"one", "two", "three", "four", "five", "six"};
              // sorting lexicographically by last letter
              Arrays.sort(stringArray, new <Object>Comparator()
              {
                  public int compare(Object o1, Object o2)
                      {
                          return(((String) o1).charAt(((String) o1).length() - 1) -
                                 ((String) o2).charAt(((String) o2).length() - 1));
                      }
              });
              System.out.println(Arrays.toString(stringArray));
          }
      }

      ---------- END SOURCE ----------

      CUSTOMER SUBMITTED WORKAROUND :
      The work around is simple, enter in good code. The problem is the compiler should not crash even if given bad code.
      ###@###.### 2005-03-22 02:22:42 GMT

            Unassigned Unassigned
            gmanwanisunw Girish Manwani (Inactive)
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              Created:
              Updated:
              Resolved:
              Imported:
              Indexed: