should be in MyApp/WEB-INF/lib/ - This directory contains JAR files that contain Java class files (and associated resources) required for your application, such as third party class libraries or JDBC drivers.
There are two locations that are commonly used within a Tomcat 5 installation for shared code:
* $CATALINA_HOME/common/lib - JAR files placed here are visible both to web applications and internal Tomcat code. This is a good place to put JDBC drivers that are required for both your application and internal Tomcat.
* $CATALINA_BASE/shared/lib - JAR files placed here are visible to all web applications, but not to internal Tomcat code. This is the right place for shared libraries that are specific to your application.