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• tomcat-embed-core.jar
• tomcat-embed-jasper.jar
• ecj-3.7.2.jar

for the core Tomcat engine.

From the "Core Tomcat" distribution, copy (and remove the old versions) to the framework/catalina/lib folder the following jars:

• tomcat-catalina-ha.jar
• tomcat-catalina-tribes.jar

for clustering support.

From the "Extras" of Tomcat, copy (and remove the old versions) to the framework/catalina/lib folder the following jars:

• tomcat-juli-adapters.jar
• tomcat-juli.jar (note: it is important to use the ones from "Extras", not the one in the main tomcat distro)

they are required to enable log4j for internal tomcat logging

framework/base/lib/j2eespecs

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• annotations-api.jar
• el-api.jar
• jsp-api.jar
• servlet-api.jar

they are the standard API specifications.