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How Line Precise Error Reporting is implemented

Hi Howard,

I read your blog and I'd like to make a request. I'd really like to read
more technical details on techniques you might use to get line precise
error reporting.

This is one of the best features of tapestry and if you can pass on some of
the details of how to go about it and get people excited about doing it
themselves that could only be a good thing. This is typically an area
where most other open source projects fail badly. The normal error
reporting seems to be the null pointer exception.

Regards,

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