IV79145: NULLPOINTEREXCEPTION IN DTFJ WHEN USING JDMPVIEW TO READ A WINDO WS CORE DUMP

APAR status

• Closed as program error.

Error description

• Error Message: Exception in thread "main"
  java.lang.NullPointerException
    at com.ibm.dtfj.java.j9.JavaRuntime.bytesPerPointer()
  .
  Stack Trace: Exception in thread "main"
  java.lang.NullPointerException
    at com.ibm.dtfj.java.j9.JavaRuntime.bytesPerPointer()
    at com.ibm.jvm.j9.dump.indexsupport.NodeClassInVM.<init>()
    at
  com.ibm.jvm.j9.dump.indexsupport.NodeJavaVM.nodeToPushAfterStart
  ing()
    at
  com.ibm.jvm.j9.dump.indexsupport.XMLIndexReader.startElement()
    at org.apache.xerces.parsers.AbstractSAXParser.startElement()
    at
  org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanStartE
  lement()
    at
  org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentCo
  ntentDispatcher.dispatch()
    at
  org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocume
  nt()
    at org.apache.xerces.parsers.XML11Configuration.parse()
    at org.apache.xerces.parsers.XML11Configuration.parse()
    at org.apache.xerces.parsers.XMLParser.parse()
    at org.apache.xerces.parsers.AbstractSAXParser.parse()
    at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse()
    at org.apache.xerces.jaxp.SAXParserImpl.parse()
    at javax.xml.parsers.SAXParser.parse()
    at
  com.ibm.jvm.j9.dump.indexsupport.XMLIndexReader.parseIndexWithDu
  mp()
    at com.ibm.dtfj.image.j9.ImageFactory.getImage()
    at com.ibm.dtfj.image.j9.ImageFactory.getImage()
    at com.ibm.jvm.dtfjview.Session.imageFromCommandLine()
    at com.ibm.jvm.dtfjview.Session.sessionInit()
    at com.ibm.jvm.dtfjview.Session.<init>()
    at com.ibm.jvm.dtfjview.DTFJView.main()
  .
  Error occurs when using sdk/bin/jdmpview to read a Windows core
  dump from a 32-bit JVM that was generated using the Windows Task
  Manager on a 64-bit version of Windows.
  

Local fix

Problem summary

• The problem is caused when the jdmpview tool is opening a
  Windows core dump that was obtained using the Windows Task
  Manager. The tool incorrectly identifies the dump as 64-bit.
  

Problem conclusion

• The DTFJ API has been updated to allow the jdmpview tool to open
  the dump correctly.
  .
  This APAR will be fixed in the following Java Releases:
     6    SR16 FP20 (6.0.16.20)
  .
  Contact your IBM Product's Service Team for these Service
  Refreshes and Fix Packs.
  For those running stand-alone, information about the available
  Service Refreshes and Fix Packs can be found at:
             https://www.ibm.com/developerworks/java/jdk/
  

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

  J9 COMMON CODE

• Fixed component ID

  620700127

Applicable component levels

• R600 PSY

     UP