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Bug ID: 6924497 HotSpotDiagnosticsMXBean.getDiagnosticOptions throws NPE
6924497 : HotSpotDiagnosticsMXBean.getDiagnosticOptions throws NPE

Details
Type:
Bug
Submit Date:
2010-02-09
Status:
Resolved
Updated Date:
2012-10-01
Project Name:
JDK
Resolved Date:
2010-02-27
Component:
core-svc
OS:
generic
Sub-Component:
java.lang.management
CPU:
generic
Priority:
P3
Resolution:
Fixed
Affected Versions:
6u21,7
Fixed Versions:
7

Related Reports
Backport:
JDK-2188195 - HotSpotDiagnosticsMXBean.getDiagnosticOptions throws NPE
Backport:
JDK-2190612 - HotSpotDiagnosticsMXBean.getDiagnosticOptions throws NPE
Backport:
JDK-2191918 - HotSpotDiagnosticsMXBean.getDiagnosticOptions throws NPE
Duplicate:
JDK-6937011 - com/sun/management/HotSpotDiagnosticMXBean/GetDiagnosticOptions.java fails with NPE
Relates:
JDK-6915365 - assert(false,"Unsupported VMGlobal Type") at management.cpp:1540
Relates:
JDK-6631166 - CMS: better heuristics when combatting fragmentation

Sub Tasks

Description
A new VM argument type "double" is added by the fix for 6631166 causes a regression to com.sun.management.HotSpotDiagnosticsMXBean API that throws NPE.

The following test failures due to this regression:
  test/com/sun/management/HotSpotDiagnosticMXBean/GetDiagnosticOptions.java
  test/com/sun/management/HotSpotDiagnosticMXBean/SetAllVMOptions.java
  test/javax/management/MBeanServer/OldMBeanServerTest.java
 
java.lang.NullPointerException
	at sun.management.HotSpotDiagnostic.getDiagnosticOptions(HotSpotDiagnostic.java:49)
	at GetDiagnosticOptions.checkDiagnosticOptions(GetDiagnosticOptions.java:57)
	at GetDiagnosticOptions.main(GetDiagnosticOptions.java:47)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:613)
	at com.sun.javatest.regtest.MainWrapper$MainThread.run(MainWrapper.java:94)
	at java.lang.Thread.run(Thread.java:717)

Comments
EVALUATION

The fix to 6898160 filters out unknown types and changes the jmm_GetVMGlobals function whose returning array may contain null elements.  JDK side needs to make the corresponding change to check for null elements and handle unsupported types gracefully.
2010-02-09 
EVALUATION

ChangeSet=http://hg.openjdk.java.net/jdk7/tl/jdk/rev/83c34a6b1458,ChangeRequest=6924497
2010-02-09


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