One of the biggest problems facing users of any new language is a lack of tools to support it, particularly debugging tools. The Java virtual machine provides a set of language-independent tools at the virtual machine level. Any new language you create for the JVM can take advantage of these tools. You can even use existing debuggers with new languages.
The Oolong assembler by default will not generate any debugging information, even if you provide the special debugging directives discussed in the next sections. To tell the Oolong assembler to include debugging information, use the -g flag on the Oolong assembler command line.