---
title:  Setting Up the HTTP Module for Tomcat
---

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To use the <%=vars.product_name%> HTTP module with Tomcat application servers, you will need to modify Tomcat's `server.xml` and `context.xml` files.

Configuration is slightly different depending on the topology you are setting up. Refer to [Common Topologies for HTTP Session Management](common_gemfire_topologies.html#common_gemfire_topologies) for more information.

## <a id="tomcat_setting_up_the_module__section_20294A39368D4402AEFB3D074E8D5887" class="no-quick-link"></a>Peer-to-Peer Setup

<img src="../../images_svg/http_module_p2p_with_locator.svg" id="tomcat_setting_up_the_module__image_bsm_2gf_sv" class="image" />
To run <%=vars.product_name%> in a peer-to-peer configuration, add the following line to Tomcat's `$CATALINA_HOME$/conf/server.xml` within the `<Server>` tag:

``` pre
<Listener className="org.apache.geode.modules.session.catalina.
                         PeerToPeerCacheLifecycleListener"
        locators="localhost[10334]" />
```

Depending on the version of Tomcat you are using, add one of the following lines to `$CATALINA_HOME$/conf/context.xml` within the `<Context>` tag:

For Tomcat 6.0:

``` pre
<Manager className="org.apache.geode.modules.session.catalina.
                         Tomcat6DeltaSessionManager"/> 
```

For Tomcat 7.0:

``` pre
<Manager className="org.apache.geode.modules.session.catalina.
                         Tomcat7DeltaSessionManager"/> 
```
For Tomcat 8.0 and 8.5:

``` pre
<Manager className="org.apache.geode.modules.session.catalina.
                         Tomcat8DeltaSessionManager"/> 
```

For Tomcat 9.0:

``` pre
<Manager className="org.apache.geode.modules.session.catalina.
                         Tomcat9DeltaSessionManager"/> 
```

## <a id="tomcat_setting_up_the_module__section_B0CEBE93564540DBA165E0F7A10FDC0B" class="no-quick-link"></a>Client/Server Setup

<img src="../../images_svg/http_module_cs_with_locator.svg" id="tomcat_setting_up_the_module__image_aqn_jjf_sv" class="image" />

To run <%=vars.product_name%> in a client/server configuration, the application server will operate as a <%=vars.product_name%> client. To do this, add the following line to `$CATALINA_HOME$/conf/server.xml` within the `<Server>` tag:

``` pre
<Listener className="org.apache.geode.modules.session.catalina.
                         ClientServerCacheLifecycleListener"/>
```

Depending on the version of Tomcat you are using, add one of the following lines to `$CATALINA_HOME$/conf/context.xml` within the `<Context>` tag:

For Tomcat 6.0:

``` pre
<Manager className="org.apache.geode.modules.session.catalina.
                         Tomcat6DeltaSessionManager"/> 
```

For Tomcat 7.0:

``` pre
<Manager className="org.apache.geode.modules.session.catalina.
                         Tomcat7DeltaSessionManager"/> 
```

For Tomcat 8.0 and 8.5:

``` pre
<Manager className="org.apache.geode.modules.session.catalina.
                         Tomcat8DeltaSessionManager"/> 
```

For Tomcat 9.0:

``` pre
<Manager className="org.apache.geode.modules.session.catalina.
                         Tomcat9DeltaSessionManager"/> 
```

The application server operates as a <%=vars.product_name%> client in this configuration. With a similar environment to this example that is for a client/server set up,

``` pre
CLASSPATH=$PWD/lib/geode-modules-<%=vars.product_version%>.0.jar:\
$PWD/lib/geode-modules-tomcat8-<%=vars.product_version%>.0.jar:\
$PWD/lib/servlet-api.jar:\
$PWD/lib/catalina.jar:\
$PWD/lib/tomcat-util.jar:\
$PWD/bin/tomcat-juli.jar
```

Start the locator and server using `gfsh`:

``` pre
$ gfsh start locator --name=locator1 --classpath=$CLASSPATH
$ gfsh start server --name=server1 --locators=localhost[10334] --server-port=0 \
  --classpath=$CLASSPATH
```

## <a id="tomcat_setting_up_the_module__section_2B97047AB30A4C549D91AD258657FBA6" class="no-quick-link"></a>Starting the Application Server

Once you've updated the configuration, you are now ready to start your tc Server or Tomcat instance. Refer to your application server documentation for starting the application server. Once started, <%=vars.product_name%> will automatically launch within the application server process.

**Note:**
<%=vars.product_name%> session state management provides its own clustering functionality. If you are using <%=vars.product_name%>, you should NOT turn on Tomcat clustering as well.

## <a id="tomcat_setting_up_the_module__section_3E186713737E4D5383E23B41CDFED59B" class="no-quick-link"></a>Verifying that <%=vars.product_name%> Started

You can verify that <%=vars.product_name%> has successfully started by inspecting the Tomcat log file. For example:

``` pre
Nov 8, 2010 12:12:12 PM
org.apache.geode.modules.session.catalina.ClientServerCacheLifecycleListener
createOrRetrieveCache
INFO: Created GemFireCache[id = 2066231378; isClosing = false; 
   created = Mon Nov 08 12:12:12 PDT 2010; server = false; 
   copyOnRead = false; lockLease = 120; lockTimeout = 60]
```

Information is also logged within the <%=vars.product_name%> log file, which by default is named `gemfire_modules.log`.