-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Sam,
On 1/13/2011 8:47 AM, Sam Zilverberg wrote: > I'm running a wicket app on tomcat 6.0.20. Upgrade! > Once in a while I need to redeploy it (after fixing some stuff, adding > features and so on). > This is how I redeploy: > 1.Use tomcat manager to undeploy the running app. > 2.Deploy the new app by copying the new WAR file to a library inside tomcat. Do you do this on the server using a "cp" (or COPY) command? Or, do you use Tomcat's manager app to deploy the updated webapp? > Everything seems fine but when I use the app I sometimes get a java.lang. > NoClassDefFoundError. > The class can be just about any class in the project and its libs. > Sometimes its a Hibernate related class, sometimes its a Wicket related > class and > sometimes its a class from my app. > Redeploying once (or a couple of times) solves the problem. > > This is very inconsistent and bothering. > After deploying I never know if the app is going to be ok or if one of its > pages will keep throwing internal errors on account of the > NoClassDefFoundError. > > Did any one ever encounter this kind of problem? I've heard about this happening with large .WAR files because something like the following happens: 1. WAR file starts copying, whether a huge, local file or a moderately-sized remote file via the manager interface.... the point is that this takes some time 2. Tomcat scans the webapps folder for .war files that have been changed since it's last auto-deploy cycle and finds the new webapp 3. Tomcat attempts to auto-deploy the webapp, but the war file is not complete, so Bad Things Happen 4. WAR file completes copying :( I can think of a few ways around this: 1. Upgrade. It's possible issues with auto-deploy and/or manager have been resolved. Read the ChangeLog. 2. Only use the manager webapp to deploy your apps. 3. Disable auto-deploy AND only use the manager webapp to deploy your webapps. This will prevent mid-copy deployments. 4. Stop Tomcat before deploying, which will solve everything :) Hope that helps, - -chris -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAk0vHqoACgkQ9CaO5/Lv0PDAdACeNQp/L6ZVaHl7zGv/jeDTwB/M uvwAoK4rB5OVlq4PzbhVqQbnEQOac699 =KsuS -----END PGP SIGNATURE----- --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
