We are using tomcat 5.0.28 with struts 1.2.4 and use tiles-definitions a lot. After our application has been runnning for a while (several days), suddenly - and we have no idea when and why - an included (via putlist and tiles:insert) jsp-page is not rendered in the html-output. This can happen with just one included file or several ones. After touching the jsp-files that are not rendered, everything is OK again. We haven't found any error messages, and logging didn't help either. Neither did rebooting linux nor restarting tomcat. Unfortunately, there is no deterministic way to produce the error. But when the error occurs, touching the jsp-files and thereby causing tomcat to compile them again does always help. So we could write a cron job that periodically touches all jsp-files... However, that is a work around that is not quite acceptable:-(
The behaviour was caused by a local variable in a tag handler which was reset in the "release"-method of the tag, assuming that "release" is called at the end of processing the JSP-page. *** This bug has been marked as a duplicate of 16001 ***