How do I connect Apache to Tomcat using the mod_jk module?
Author: Deron Eriksson
Description: This tutorial describes how to connect the Apache Web Server to Tomcat using the mod_jk module.
Tutorial created using: Windows XP || JDK 1.5.0_09 || Eclipse Web Tools Platform 1.5.4 || Tomcat 5.5.20 || Apache HTTP Server 2.2.4

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After that, I modified httpd.conf by adding the following code for mod_jk. We load the mod_jk module that we placed in the modules directory using the LoadModule directive. We mount the tomcat-demo web project that we have running in EclipseSW.

httpd.conf mod_jk modification

LoadModule jk_module modules/

<IfModule jk_module>

    JkWorkersFile conf/
    JkLogFile logs/mod_jk.log
    JkLogStampFormat "[%b %d %Y - %H:%M:%S] "
    JkRequestLogFormat "%w %V %T"
    JkLogLevel info

    JkOptions +ForwardKeySize +ForwardURICompat -ForwardDirectories

    Alias /tomcat-demo "C:/projects/workspace/tomcat-demo/"

    <Directory "C:/projects/workspace/tomcat-demo/">
        AllowOverride None
        Allow from all

    <Location /*/WEB-INF/*>
        deny from all

    JkMount /tomcat-demo/* myworker


We can verify the syntax of these modifications via:

C:\Apache2.2.4\bin>httpd.exe -t
Syntax OK


Let's restart ApacheSW to make these Apache changes take effect.

Now that Apache's restarted, let's first verify that we can hit the 'tomcat-demo' project directly running on TomcatSW on port 8080 via http://localhost:8080/tomcat-demo/test:

hitting test servlet directly via tomcat (port 8080)

Since that worked, let's now try hitting the 'tomcat-demo' test servletW running on Tomcat through Apache via the mod_jk connector. We can do this by hitting http://localhost/tomcat-demo/test:

hitting test servlet via Apache (port 80)

As you can see, it works! This has been a demonstration of how you can have Apache connect to Tomcat via mod_jk when you have both running locally on your machine. If you're developing software locally running Tomcat in Eclipse, why would you ever want to hit your web application through Apache connecting to Tomcat? Well, production environment typically have web servers sitting in front of your servlet containers, and sometimes complicated issues can arise in these situations. By setting up Apache locally in front of your local Tomcat, it can help you mimic your production environment, which can aid in debugging.

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