Multiple Tomcat Lib Directories in Tomcat 5.5.x – Purpose and differences
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The document discusses the purpose and differences between the multiple lib directories in Tomcat 5.5.x. The <Catalina_Home>/server/lib directory contains jars only visible to and used by the Tomcat container. The <Catalina_Home>/common/lib directory contains jars visible to and used by both the container and web applications. The <Catalina_Home>/shared/lib directory contains jars only visible to and used by web applications. Each directory is loaded by a different class loader that determines which components the jars are visible to.
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Multiple Tomcat Lib Directories in Tomcat 5.5.x – Purpose and differences
- 1. Multiple Tomcat Lib Directories in Tomcat 5.5.x – Purpose and differences Vijay Prasad Gupta ECM & Web Architect http://www.linkedin.com/in/vpgupta/ http://ecmwebandmore.blogspot.com/
- 2. Multiple lib directories under Tomcat…why? • <Catalina_Home>/server/lib • <Catalina_Home>/common/lib • <Catalina_Home>/shared/lib
- 3. <Catalina_Home>/server/lib • Contains jar files to be used by tomcat container. Includes all classes and resources required to implement Tomcat 5.5.x itself • These classes and resources are totally invisible to web applications • The Catalina class loader makes these classes and resources visible to tomcat containers
- 4. <Catalina_Home>/common/lib • Contains jar files to be used by both the tomcat container as well as all deployed web applications • These classes and resources are visible to both container and all web applications • The Common class loader makes these classes and resources visible to both container as well as web- applications
- 5. <Catalina_Home>/shared/lib • Contains jar files to be used by all deployed web applications only • These classes and resources are totally invisible to tomcat container • The Shared class loader makes these classes and resources visible to all deployed web applications
- 6. Summary Folder Path Visible to tomcat Visible to web Class Loader Name container applications <Catalina_Home>/server/lib Yes No Catalina <Catalina_Home>/common/lib Yes Yes Common <Catalina_Home>/shared/lib No Yes Shared
- 7. References • http://tomcat.apache.org/tomcat-5.5- doc/class-loader-howto.html • http://javahowto.blogspot.com/2007/01 /tomcat-commonlib-vs-sharedlib.html
- 8. Thank You !! • Any Questions ?