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Tomcat as we all know is a Web Container available with Apache family of products. It implements Java Servlet 2.5 API and Java Server Pages 2.1 API. Apache Geronimo which is a Java EE5 certified application server which Apache Derby, Apache Active MQ, Apache AXIS, Apache Tomcat etc pre-integrated. As a result while working with Geronimo you will be working with same Tomcat engine as the standalone version of Tomcat. However there are some differences which we will discuss in upcoming sections

Implementation Analysis

While working with Geronimo you will be working with same Tomcat as the standalone Tomcat. This section will enlist the basic differences/similarities between Geronimo and Tomcat

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Search for <servlet-class>org.apache.jasper.servlet.JspServlet </servlet-class> and add the following elements under the servlet class

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modificationTestInterval is time in seconds.

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Using this you can retain the compiled JSPs of all Web applications running in the server across server restarts. Edit <geronimo_home>/var/catalina/conf/web.xml. Search for org.apache.jasper.servlet.JspServlet and add the following elements

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Create a directory <geronimo_home>/var/catalina/temp. All the web applications will be compiled and stored in temp directory. These will persist over server restarts.

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Configure the web deployment descriptor web.xml in application as follows

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You need to create the temp directory in this case as well.

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Following resources can be useful while migrating from Tomcat to Geronimo
1) http://geronimo.apache.org/schemas-2.1/docs/geronimo-module-1.2.xsd.html^{Image Removed} - Look for inverse-classloading. You may also want to know more on dependencies, hidden-classes, non-overridable-classes. These all elements will be helpful in modifying the geronimo-web.xml.
2) Learn how to configure JMS with apache geronimo - http://cwiki.apache.org/GMOxDOC21/web-application-for-jms-access.html^{Image Removed}
3) Learn how to configure JDBC with apache geronimo- http://cwiki.apache.org/GMOxDOC21/web-application-for-jdbc-access.html^{Image Removed}
4) For security related configurations you can refer- http://cwiki.apache.org/GMOxDOC21/configuring-security.html^{Image Removed}
5) More on configuring various services- JMS, JDBC http://cwiki.apache.org/GMOxDOC21/configuring-services.html^{Image Removed}