Mutant World

Sunday, November 28, 2004

Integrating JOTM 1.5.3 in Tomcat 5.0.x

Recently I have integrated Tomcat 5.0.x with JOTM 1.5.3, running on J2SE 1.4.2.

Needless to say, Greg already provides the Jetty-Extra package which already provides the Jetty-JOTM integration.

The steps for Tomcat-JOTM integration are the following:

  1. Copy to $TOMCAT/common/lib the following jars:

    • carol.jar

    • connector-1_5.jar

    • jotm.jar

    • jta-spec1_0_1.jar

    • objectweb-datasource.jar

    • xapool.jar


    I found that carol does not need any stub since it works in local mode (see below).

  2. Create a carol.properties file in $TOMCAT/common/classes containing the following text:

    # lmi stands for Local Method Invocation (it's a "fake" RMI)
    carol.protocols=lmi

    # do not use CAROL JNDI wrapper
    carol.start.jndi=false

    # do not start a name server
    carol.start.ns=false


  3. Configure Tomcat's Context (either in $TOMCAT/conf/server.xml or in $TOMCAT/conf/Catalina/localhost/<mywebapp>.xml file) so that a UserTransaction object is bound in JNDI, as shown below:


    <Context ...>
    <Resource name="jdbc/mysql" auth="Container" type="javax.sql.DataSource"/>
    <ResourceParams name="jdbc/mysql">
    ...
    </ResourceParams>

    <Resource name="UserTransaction" auth="Container" type="javax.transaction.UserTransaction"/>
    <ResourceParams name="UserTransaction">
    <parameter>
    <name>factory</name>
    <value>org.objectweb.jotm.UserTransactionFactory</value>
    </parameter>
    <parameter>
    <name>jotm.timeout</name>
    <value>60</value>
    </parameter>
    </ResourceParams>
    </Context>


    Normally there is also a DataSource configured, and this DataSource is also referenced in WEB-INF/web.xml, but that should be there independently of the transaction manager.


It is that simple.

It is very important not to include jotm.jar in WEB-INF/lib of your application.

If you want to see some extra logging to be sure everything went fine, just drop Log4J's jar into $TOMCAT/common/lib and add a log4j.properties in $TOMCAT/common/classes.

Jetty|Tomcat + JOTM + Hibernate does the job for me :-)

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