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There are a number of extension points provided within Jasper that enable the user to optimise the behaviour for their environment.
The first of these extension points is the tag plug-in mechanism. This allows alternative implementations of tag handlers to be provided for a web application to use. Tag plug-ins are registered via a tagPlugins.xml file located under WEB-INF. A sample plug-in for the JSTL is included with Jasper.
The second extension point is the Expression Language interpreter. Alternative interpreters may be configured through the ServletContext. See the ELInterpreterFactory javadoc for details of how to configure an alternative EL interpreter.
