MustGather: Read first for - Runtimes for Java Technology

Technote (troubleshooting)


Problem(Abstract)

For every problem, collecting data can aid in problem determination and save time resolving Problem Management Records (PMRs).

Gathering this data before calling IBM support will help you understand the problem and save time analyzing the data.

Resolving the problem

There are a number of diagnostic capabilities built into the operating system and into the Java Runtime that enable problem determination of both application and Java Runtime based problems.
Collecting MustGather data early, even before opening a PMR, helps IBM Support quickly determine if:

  • Symptoms match known problems (rediscovery)
  • There is a non-defect problem that can be identified and resolved
  • There is a defect that identifies a workaround to reduce severity
  • Locating root cause can speed development of a code fix

The Java Mustgathers with respect to platforms and problem scenario is provided below for your reference:

Platform
Problem scenario
Setup/Gather
AIX, Linux, Windows, z/OS
Java Exception
[ Setup] [ Gather]
Crash due to Shared class cache
corruption
[ Setup] [ Gather]
VerifyError
[ Setup] [ Gather]
AIX
OutOfMemoryError
[ Setup] [ Gather]
100% CPU Usage
[ Setup] [ Gather]
Crash
[ Setup] [ Gather]
Hang/Bad Performance
[ Setup] [ Gather]
Linux
OutOfMemoryError
[ Setup] [ Gather]
100% CPU Usage
[ Setup] [ Gather]
Crash
[ Setup] [ Gather]
Hang/Bad Performance
[ Setup] [ Gather]
Windows
OutOfMemoryError
[ Setup] [ Gather]
100% CPU Usage
[ Setup] [ Gather]
Crash
[ Setup] [ Gather]
Hang/Bad Performance
[ Setup] [ Gather]
z/OS
OutOfMemoryError
[ Setup] [ Gather]
100% CPU Usage
[ Setup] [ Gather]
Crash
[ Setup] [ Gather]
Hang/Bad Performance
[ Setup] [ Gather]

Submitting information to IBM Support
After a PMR is open, you can submit diagnostic MustGather data to IBM.

If using SR, update the PMR to indicate that data has been sent.


Related information

Cross reference information
Segment Product Component Platform Version Edition
Application Servers WebSphere Application Server Java SDK
Application Servers WebSphere Real Time General

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Document information


More support for:

Runtimes for Java Technology
General

Software version:

5.0, 6.0, 6.1, 7.0, 7.1

Operating system(s):

AIX, Linux, Windows, z/OS

Reference #:

1231557

Modified date:

2009-03-09

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