eclipse debug jspwriter output

Recently I send a lot of time debugging other people's code, and a lot of it is using obsolete servlets etc.
What bothers me the most is how can I watch the progress of filling buffer for jspwriter before it is actually flushed out?
The problem is that in those servlets not only HTML and JSP are created but JavaScript as well and quite often I have to catch where is error.
Any ideas or suggestions how should I do this?
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It is directly mapped to socket buffer.... Use system tracing, traffic dmping and other lowlevel tools.
KPaxAuthor Commented:
OK, I haven't done that before, but I will try. Do you have anything more to suggest?
It is abstraction of output buffer that you should not even try to control.... Just let it be.
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