> Hi There, > > We are about to upgrade from tomcat-7.0.65 to tomcat-8.0.XX. and this is > regarding the loading of same JARs within the different application. to > understand the scenario, consider below case > > Tomcat 8 --- > webapps > a.war--> lib--> spring.jar > b.war--> lib--> spring.jar > > here b.war is just a copy of a.war and renamed just to differentiate hence > spring.jar is same for both the applications. > > My question is > > 1) will spring.jar loaded twice
yes it will be loaded twice > 2) how to i make sure to load it only once ( if loaded twice) This question comes up frequently. Search the mailing list for shared class loader to see the details. The upshot is that this can be done using shared class loader, however there are real technical issues if you do this - class cast exceptions, difficulty performing upgrades to individual wars without taking down all of tomcat. The only positive is that you might save a few MB of memory cost by having the same jar loaded twice in memory. I've been on this mailing list for ~8 years, and every time this issues comes up (about 5 times a year?), the tomcat developers suggest that the proposed memory saving isn't not worth the problems that it causes.. HTH Chris --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
