Tools: Debugging Native and Java Code with WDB

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Tools for

Debugging

gdb

Starting Java from gdb:

DEBUG_PROG

• Built-in mechanism available in .java_wrapper for 1.3.1

• Set DEBUG_PROG in your shell:

export DEBUG_PROG=/opt/langtools/bin/gdb

export GDB_JAVA_UNWINDLIB=/tmp/libjunwind.sl

• Problem using arguments to the java command

• You need to remove arguments else you get:

/opt/langtools/bin/gdb: unrecognized option ‘-

Xmn500m’

• Proceed as with modified .java_wrapper method

• Type in all of the arguments:

(gdb) r -Xmn500m -Xms1024m -Xmx1024m

COM.volano.Mark -port 8000 -count 5000 -rooms 5

• Can be cumbersome with large numbers of arguments

• Alternatively, use the “set args” feature in your ~/.gdbinit file