Tomcat 5.5 documentation indicates that JAR files containing libraries should be stored in the webapps META-INF directory, per the JSP specification:
The problem very likely is caused by timestamp mismatch. The newly uploaded JSP page or servlet has an older timestamp than that of the cached page or servlet on the server. To avoid the problem, ensure the system clock on the machine where the JSP or servlet uploaded from is in sync with the system clock of the machine where the server is running on. To remedy the problem, check the following:
Popular Links