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Java™ Troubleshooting Guide for HP-UX Systems

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HP Part Number: 5992-1918

Edition: 3

Published: July 2007

© Copyright 2007 Hewlett-Packard Development Company.

Table of Contents

About This Document

1 Diagnostic and Monitoring Tools and Options

HP-UX Java Tools and Options Tables

Crash Analysis Tools
Hung and Deadlocked Processes
Fatal Error Handling
Monitoring Memory Use
Performance Tools
Miscellaneous Tools and Options
JDK Tools Not Available on HP-UX

Ctrl-Break Handler

Fatal Error Log (hs_err_pid<pid>.log)

Java Stack Unwind Features
gdb Subcommands for Java VM Debugging

Static Data Analysis
Dynamic Data Analysis

java.security.debug System Property

JAVA_TOOL_OPTIONS Environment Variable

jconsole (1.5+ only)

jps (1.5+ only)

jstat (1.5+ only)

jstatd (1.5+ only)

jvmstat Tools

-verbose:class

-verbose:gc

-verbose:jni

-Xcheck:jni

-Xverbosegc

-XX:ErrorFile

-XX:+HeapDump and _JAVA_HEAPDUMP Environment Variable

Other HeapDump Options
-XX:+HeapDumpOnCtrlBreak
-XX:+HeapDumpOnOutOfMemoryError
-XX:+HeapDumpOnly
Using Heap Dumps to Monitor Memory Usage

-XX:OnError

-XX:+ShowMessageBoxOnError

2 Useful System Tools for Java Troubleshooting

GlancePlus
tusc
Prospect
HP Caliper
sar
vmstat
iostat
swapinfo
top
netstat
Other Tools

3 Getting Help from Hewlett-Packard

Problem Report Checklist

Collecting Problem Data

Collecting Core File Information
Collecting Fatal Error Log Information
Collecting Stack Trace Information

Collecting System Information

Collecting Java Environment Information

Environment Variables
Libraries

Packaging Files

4 Core File Analysis

Sample Java Application

StackTraceJob
StackTrace.java
stacktrace.c

Building the Application

Verify Core File

Debugging On Same System

Packaging Files For Debugging On Different System

Unpacking Files On Debugging System

Example gdb Session

List of Figures

1-1 HPjconfig - System Tab
1-2 HPjconfig - Application Tab
1-3 HPjconfig - Patches Tab
1-4 HPjconfig - Tunables Tab
1-5 HPjmeter - Profile Data
1-6 HPjmeter - Threads/Locks Metrics
1-7 HPjmeter - Garbage Collection Analysis
1-8 HPjmeter - Connecting to Server
1-9 HPjmeter - Setting Session Preferences
1-10 HPjmeter - Collecting Metrics
1-11 HPjmeter - Choosing Metrics to Monitor
1-12 HPjmeter - Memory Leak Alert
1-13 HPjmeter - Heap Monitor Display
1-14 HPjmeter - Thread Histogram
1-15 HPjtune Screen
1-16 jconsole Screen
1-17 visualgc Application Information Window
1-18 visualgc Graph Window
1-19 visualgc Survivor Age Histogram Window

List of Tables

1-1 Tools and Options for Crash Analysis
1-2 Tools and Options for Debugging Hung and Deadlocked Processes
1-3 Options for Fatal Error Handling
1-4 Tools and Options for Monitoring Memory Use
1-5 Performance Tools
1-6 Miscellaneous Tools and Options
1-7 JDK Tools Not Available on HP-UX
1-8 Java Version Information for gdb Java VM Debugging Features
1-9 Java VM Debugging Commands
1-10 Java Subcommands
1-11 HPjmeter 3.0 Features
1-12 Java SDKs and JDKs Supported by HPjmeter 3.0
1-13 Options to the jstat Command
1-14 jstat — New Generation Statistics
1-15 Garbage Collection Field Information
1-16 Overview of HeapDump Options
3-1 Libjunwind Library Location for PA-RISC Systems
3-2 Libjunwind Library Location for Integrity Systems

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© 2007 Hewlett-Packard Development Company, L.P.