Tools: Debugging Native and Java Code with WDB

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Tools for

Debugging

gdb: Start-up

Four Methods for Debugging Java

Four methods:

1. Modify application launch script’s java command

+ Often the easiest approach – uses DEBUG_PROG

2. Modify the /opt/java1.3/bin/.java_wrapper script

+ Easy to pass command line arguments

– Need to have special JDK if many java processes

3. Use built-in DEBUG_PROG environment variable

+ Easy to set for the process

– Hard to pass in large numbers of command line

arguments

4. Attach to a running Java program

+ Easy to do