IV79222: NULL POINTER EXCEPTION IN IBM.TOOLS.ATTACH.J9ATTACHPROVIDER.LIST VIRTUALMACHINES

APAR status

• Closed as program error.

Error description

• Error Message: java.lang.NullPointerException
  .
  Stack Trace: Exception in thread "AWT-EventQueue-0"
  java.lang.NullPointerException
      at
  ibm.tools.attach.J9AttachProvider.listVirtualMachines(J9AttachPr
  ovider.java:46)
      at
  com.sun.tools.attach.VirtualMachine.list(VirtualMachine.java:174
  )
      at
  sun.tools.jconsole.LocalVirtualMachine.getAttachableVMs(LocalVir
  tualMachine.java:181)
      at
  sun.tools.jconsole.LocalVirtualMachine.getAllVirtualMachines(Loc
  alVirtualMachine.java:140)
      at
  sun.tools.jconsole.ConnectDialog$ManagedVmTableModel.refresh(Con
  nectDialog.java:746)
      at
  sun.tools.jconsole.ConnectDialog$ManagedVmTableModel.<init>(Conn
  ectDialog.java:737)
      at
  sun.tools.jconsole.ConnectDialog.<init>(ConnectDialog.java:146)
      at
  sun.tools.jconsole.JConsole.showConnectDialog(JConsole.java:644)
  .
  This can occur in the case where the attach API is disabled and
  the common directory
  /tmp/.com_ibm_tools_attach
  is absent.
  

Local fix

• Note that attach API is disabled by default on z/OS systems.
  Tools such as jconsole which use attach API will produce no
  results in this case and should not be run.
  

Problem summary

• The attach API returned a null if the common directory is
  absent.
  

Problem conclusion

• The attach API returns an empty list if the common directory is
  absent.
  .
  This APAR will be fixed in the following Java Releases:
     7    SR9 FP30  (7.0.9.30)
     8    SR2 FP10  (8.0.2.10)
     7 R1 SR3 FP30  (7.1.3.30)
     6 R1 SR8 FP20  (6.1.8.20)
  .
  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

• R260 PSY

     UP

• R270 PSY

     UP