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  1. JDK
  2. JDK-4408211

Document behavior differences between hotspot/classic JVM

    Details

    • Type: Enhancement
    • Status: Closed
    • Priority: P3
    • Resolution: Not an Issue
    • Affects Version/s: 1.3.0
    • Fix Version/s: None
    • Component/s: docs
    • Labels:
    • Subcomponent:
    • CPU:
      generic
    • OS:
      generic

      Description



      Name: yyT116575 Date: 01/25/2001


      java version "1.3.0_01"
      Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.0_01)
      Java HotSpot(TM) Client VM (build 1.3.0_01, mixed mode)

      One of the situations in which the hotspot JVM would behave differently that a
      classic JVM is described in the "Method Dispatch Differences" available at:
      http://java.sun.com/products/hotspot/1.0/dispatch.html

      However, some notable other differences exist. It would save developpers a great
      time if such differences where documented in the JDK. In the meantime I hope
      that this bug report would at least help developpers find one of them: handling
      of unavailable classes:

      It seems that an imported [exception] class that is never used would not trigger
      the throwing of any exception in a class JVM, but would lead to a
      java.lang.NoClassDefFoundError runtime exception in a hotspot JVM. This can be a
      good thing to be aware of when debugging problems that occur in a hotSpot JVM
      but not a classic JVM.

      In my case, this problem was especially difficult to detect since the exception
      was masked by one JDK class catching the NoClassDefFoundError and rethrowing an
      unrelated exception without specifying the root cause
      ("java.io.StreamCorruptedException: Unread data" thrown by ObjectInputStream)
      The problem would not occur in classic JVM whereas it was reproducing in
      hotspot. It would have helped me in my debugging to read somewhere that the
      hotpot JVM was handing missing classes differently than classic JVM.
      (Review ID: 115784)
      ======================================================================

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            • Assignee:
              shommel Scott Hommel (Inactive)
              Reporter:
              yyoungsunw Yung-ching Young (Inactive)
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