Thanks Craig. We will try your suggestion. As I stated, this happens only when there are more than 1 web apps deployed on the server. We have verified that the commons-logging classes were not deployed at the app server level when the error occured. It seems the class loader of one web application is interfering with the other. Suspecting a similar problem, we moved the commons-logging jar file along with log4j to the application server's classpath. These classes are then loaded by the app server's class loader and visible to all web apps. The problem seems to be resolved (we are still testing). However, I am aware that the Struts Configuration manual specifically recommends against sharing Struts components across applications by deploying them at the app server level due to inter-webapp conflicts with static variables and other issues. So we would prefer to get this configured and working in the recommended way.
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