HP-UX JVM Core Dump Analyser

[Ashok Chawla]

Hi ,

We are using JDK 1.3.1 on HP-UX 11.1 alongwith Jacl 1.2.6.

Our server application often crashes (almost in 30 days of running) with JVM core dump.

How can we analyse the core file generated due to JVM core dump ?

Any pointer on why its happening is appreciated.

Regards
Ashok Chawla

[Ravi_8]

Hi chawla

u can use debugger (/opt/langtools/bin/dde)

[Alex Glennie]

file core ?

think of trying java 1.4 ?

debug it -> see http://h21007.www2.hp.com/dspp/tech/tech_TechDocumentDetailPage_IDX/1,1701,1677,6,7,00.html#adv-core

[Ashok Chawla]

Hi Alex,

Core file is too big so i can not attach it alongwith mail.

Analysing core file with gdb does not provide me information about Java Code that caused core dump.

When JVM core dumps , sometimes it gives message 'illegal instruction' and sometime it gives message SIGNLAL 4 received.

Regards
Ashok Chawla

[Alex Glennie]

suggestions :

raise issue with either HP or Jacl support, ensure latest HP patches installed : see : www.hp.com/go/java

try installing java 1.4 since bugs tend to be fixed on a per release basis

hope someone with more java programming experience responds to this post ....

[Stanimir]

Hi!
As far as understand you cannot any problems
with translation the program with JVM.
You have received run-time errors.
These type of problems are usually because
of current vers. bugs. But java upgrades are not available as patches. Try to
download latter version from:
#www.hp.com/go/java
and also there is however a series of HP-UX patches that java depends on. Refer information about them from there and your core-dump-information, so you can find
necessary download.
Regards, S

[Adam J Markiewicz]

Hi

As far as I understand this, these core dumps come from the JVM itself, not from the java code.
Do not bother in analysing it unless you're interested in JVM assembly source...

In simple words - the bug is biting you. Let's hope in the newer version it was killed.

Good luck

Adam