IZ33124: SERILIZE HASHMAP WILL THROW CLASSCASTEXCEPTION WHEN EXTENDS ITS INNER CLASS MAP.ENTRY

APAR status

• Closed as program error.

Error description

• Error Message: After extending HashMap's inner class of
  Map.Entry, serialize the HashMap will throw a
  ClassCastException.
  .
  Stack Trace: java.lang.ClassCastException:
  luni.TestSerialization$TestEntrySetEntry incompatible with
  java.util.HashMap$Entry
   at java.util.HashMap.writeObject(HashMap.java:845)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at
  sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessor
  Impl.java:45)
   at
  sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethod
  AccessorImpl.java:37)
   at java.lang.reflect.Method.invoke(Method.java:599)
   at
  java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.ja
  va:956)
   at
  java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.ja
  va:1472)
   at
  java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStrea
  m.java:1403)
   at
  java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:
  1161)
   at
  java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:3
  37)
   at luni.TestSerialization.main(TestSerialization.java:98)
  Exception in thread "main" java.lang.RuntimeException:
  java.lang.ClassCastException:
  luni.TestSerialization$TestEntrySetEntry incompatible with
  java.util.HashMap$Entry
   at luni.TestSerialization.main(TestSerialization.java:103)
  Caused by: java.lang.ClassCastException:
  luni.TestSerialization$TestEntrySetEntry incompatible with
  java.util.HashMap$Entry
   at java.util.HashMap.writeObject(HashMap.java:845)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at
  sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessor
  Impl.java:45)
   at
  sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethod
  AccessorImpl.java:37)
   at java.lang.reflect.Method.invoke(Method.java:599)
   at
  java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.ja
  va:956)
   at
  java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.ja
  va:1472)
   at
  java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStrea
  m.java:1403)
   at
  java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:
  1161)
   at
  java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:3
  37)
   at luni.TestSerialization.main(TestSerialization.java:98)
  .
  

Local fix

Problem summary

• Internal method writeObject will cast the Map.Entry unnecessary.
  

Problem conclusion

• This defect will be fixed in:
  6.0.0 SR3
  .
  Remove the incorrect type casting in writeObject of HashMap
  .
  To obtain the fix:
  Install build 20080925 or later
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  JAVA CLASS LIBS

• Fixed component ID

  620700130

Applicable component levels

• R600 PSN

     UP