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1.27.1 Other HeapDump Options....................................................................................................48
1.27.2 -XX:+HeapDumpOnCtrlBreak ..............................................................................................48
1.27.3 -XX:+HeapDumpOnOutOfMemoryError.............................................................................49
1.27.4 -XX:+HeapDumpOnly...........................................................................................................49
1.27.5 Using Heap Dumps to Monitor Memory Usage...................................................................49
1.28 -XX:OnError...................................................................................................................................49
1.29 -XX:+ShowMessageBoxOnError....................................................................................................50
2 Useful System Tools for Java Troubleshooting...........................................................51
2.1 GlancePlus.......................................................................................................................................51
2.2 tusc...................................................................................................................................................51
2.3 Prospect...........................................................................................................................................51
2.4 HP Caliper.......................................................................................................................................51
2.5 sar....................................................................................................................................................51
2.6 vmstat..............................................................................................................................................51
2.7 iostat................................................................................................................................................51
2.8 swapinfo..........................................................................................................................................52
2.9 top....................................................................................................................................................52
2.10 netstat.............................................................................................................................................52
2.11 Other Tools....................................................................................................................................52
3 Getting Help from Hewlett-Packard............................................................................53
3.1 Problem Report Checklist................................................................................................................53
3.2 Collecting Problem Data.................................................................................................................54
3.2.1 Collecting Core File Information.............................................................................................54
3.2.1.1 Core File Checklist..........................................................................................................54
3.2.1.1.1 Estimate Core File Size............................................................................................54
3.2.1.1.2 Ensure Process Can Write Large Core Files............................................................54
3.2.1.1.3 Verify Amount of Disk Space..................................................................................55
3.2.1.1.4 Check If Directory Supports Large File Systems....................................................55
3.2.1.1.5 Ensure Permissions Allow Core Files.....................................................................56
3.2.1.2 Generating a Core File.....................................................................................................56
3.2.1.3 Verifying a Core File........................................................................................................56
3.2.2 Collecting Fatal Error Log Information...................................................................................56
3.2.3 Collecting Stack Trace Information.........................................................................................57
3.3 Collecting System Information........................................................................................................58
3.4 Collecting Java Environment Information......................................................................................58
3.4.1 Environment Variables............................................................................................................58
3.4.2 Libraries...................................................................................................................................59
3.5 Packaging Files................................................................................................................................60
4 Core File Analysis........................................................................................................61
4.1 Sample Java Application.................................................................................................................61
4.1.1 StackTraceJob...........................................................................................................................61
4.1.2 StackTrace.java........................................................................................................................62
4.1.3 stacktrace.c...............................................................................................................................63
4.2 Building the Application.................................................................................................................64
4.3 Verify Core File................................................................................................................................65
4.4 Debugging On Same System...........................................................................................................65
4.5 Packaging Files For Debugging On Different System.....................................................................65
4.6 Unpacking Files On Debugging System.........................................................................................66
4.7 Example gdb Session.......................................................................................................................68
4.8 Summary.........................................................................................................................................73
4 Table of Contents