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• Tomcat Environment : This is the minimal runtime, which is identical to a pure Tomcat runtime. It only has Tomcat, Servlet, JSP, EL and JSTL available in the server-level classpath. If you want additional JARs, you should package them with the web application or place them in the Tomcat environment's extension directory.
• Carbon Environment : This consists of both the Tomcat environment and the WSO2 Carbon runtime. It does not provide CXF or Spring dependencies. If you want additional JARs, you should package them with the web application or place them in the WSO2 Carbon environment's extension directory.
• CXF Environment : This consists of the Tomcat environment, CXF and Spring. It does not provide the WSO2 Carbon runtime. If you want additional JARs, you should package them with the web application or place them in the CXF environment's lib directory.

• Javaee Environment: This consists of the Javaee runtime and the WSO2 Carbon runtime. If you want additional JARs, you should package them with the web application or place them in the Javaee environment's lib directory.

See the following topics for more information:

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• In Tomcat Environment - <PRODUCT_HOME>/lib/runtimes/ext
• In Carbon Environment - <PRODUCT_HOME>/repository/components/lib
• In CXF, Javaee or any Custom Environment – Use the environment's lib directory. 
  For example:
   <PRODUCT_HOME>/lib/runtimes/cxf

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