JSP tag lifecycle

Posted by mkoryak on Stack Overflow See other posts from Stack Overflow or by mkoryak
Published on 2009-03-05T18:46:12Z Indexed on 2010/05/18 12:00 UTC
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i just introduced a bug into my code because i seem to have misunderstood the jsp tag lifecycle. The tag worked like this before the bug: i pass the tag some collection as an attribute, and it displays it as a table. The collection was passed into the JSP from the controller.

after the bug: a removed the attribute which set the collection. instead, in the tag i check if the collection is null, and then grab it by name from the request (using a naming convention).

the thing that i didnt expect: after the collection was initially set in the tag, it would never become null on subsequent executions! it was still defined as an non-requred attribute in the TLD.

I expected the tag to not hold on to previous values between executions.

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