JDK-5009574 : Compiler should prohibit extending java.lang.Enum
  • Type: Bug
  • Component: tools
  • Sub-Component: javac
  • Affected Version: 1.4.0,5.0
  • Priority: P2
  • Status: Resolved
  • Resolution: Fixed
  • OS: generic,linux
  • CPU: generic,x86
  • Submitted: 2004-03-08
  • Updated: 2004-04-01
  • Resolved: 2004-04-01
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5.0 b46Fixed
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The JSR-201 Public Review Draft Spec says that it is illegal for a class to extend java.lang.Enum explicitly but compiler permits it.  The following program should generate an compile-time error.  In fact it crashes the compiler:

public class Junk extends Enum {
    Junk() { super(null, 0); }

CONVERTED DATA BugTraq+ Release Management Values COMMIT TO FIX: tiger-beta2 FIXED IN: tiger-beta2 INTEGRATED IN: tiger-b46 tiger-beta2


SUGGESTED FIX See changes in 5009601. ###@###.### 2004-03-29

EVALUATION This rule remains in the latest "preliminary proposed final draft 2" (section III, second sentence) and so should be implemented in javac. ###@###.### 2004-03-08