I'm running Tomcat/5.0.18 WITHOUT apache. It works fine, it can shows .html and .shtml files also. How can I enable SSI? I went through the renamejar and uncomment things, but it still doesn't work. Thanks in advance!

spent many hours testing and this worked on tomcat version 5.0.25
hope it helps.

follow this:
1. rename the file "$CATALINA_HOME/server/lib/servlets-ssi.renametojar file" to "$CATALINA_HOME/server/lib/servlets-ssi.jar"
2. In "web.xml" file, unmask SSI declaration...
    <servlet>
        <servlet-name>ssi</servlet-name>
        <servlet-class>
          org.apache.catalina.ssi.SSIServlet
        ...
3. Change the param-value of "isVirtualWebappRelative" from 0 to 1
4. In "web.xml" file, Unmask the SSI mapping...
    <servlet-mapping>
        <servlet-name>ssi</servlet-name>
        <url-pattern>*.shtml</url-pattern>
    </servlet-mapping>
5. restart tomcat
6. In your shtml file, use...

    NOTE: type exactly, observe case and space!