On 01/08/2012 02:53, andreas palsson wrote: > > Good morning. > > After upgrading to 7.0.29, one of my larger webapps could no longer be > deployed due to "OutOfMemoryError". > As far as I know, this is related to the new feature of annotation scanning > which was enabled in v7.0.29 (see the stack trace below). > > Have anyone else experienced the same issue?
There are multiple issues going on here. There have been reported previously and are understood. I'll try and explain the full story. The servlet spec requires (and the expert group (EG) confirmed) that Tomcat always scans for ServletContainerInitializers (SCIs), even if metadata-complete is true. Tomcat was changed to do this in 7.0.29. SCIs can have @HandlesTypes annotations. If one is present, Tomcat must scan every class and its hierarchy looking for matches to the HandlesTypes. Tomcat caches the results of this scan to speed up processing so it doesn't repeatedly scan the same classes. If A & B both inherit from C, when Tomcat scans A it also scans C and caches the result so it doesn't have to scan C again when checking B. Tomcat was caching more than it needed to making the cache excessively large. This is bug 53535 which has already been fixed and will be in 7.0.30 onwards. This then raises the question of how to turn of scanning for classes that match HandlesTypes. While the spec says that JARs excluded using an absolute-ordering are not scanned for matches to HandlesTypes it was unclear what is meant to happen when metadata-complete is true since ordering is ignored in that case. The EG has recently clarified this and stated that JARs excluded using an absolute-ordering are not scanned for matches to HandlesTypes regardless of the setting of metadata-complete. The discussion is not yet complete and we are waiting for it to conclude and before implementing the results of that discussion in 7.0.30. Mark --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
