hi guys.. when i used iplanet4.0 for develop a web application including jsp and servlet,i include the Oracle JDBC driver classes12.zip in the jvm classpath of iplanet,it works,today,under tomcat,i use a war to deploy my web application and i put the classes12.zip under WEB-INF/lib/,the database connection could not be got,after some debugs,i found if i change the classes12.zip to classes12.jar,it works again.. could some one else tell me why???
Because the code in Tomcat that loads up all of the classes from those special directories doesn't load anything but *.jar files. It's just the way the TC developers have chosen to implement their class loading.
Also because a JAR is just a specialized form of ZIP. Otherwise it STILL wouldn't have worked. However, I'd normally not put the JDBC drivers - or for that matter ANY non-"business" code in the webapp, excepting things that are not sharable anyway. I'd put them in TOMCAT_HOME/common/lib.
An IDE is no substitute for an Intelligent Developer.