Configuring a MySQL Datasource in Apache Tomcat

Instructions on setting up a MySQL DataSource connection for Confluence Standalone or EAR/WAR.

autoReconnect=true is required

The Confluence database connection URL must have autoReconnect=true added to the end to prevent disconnection issues.

Shut down Tomcat

Run bin/shutdown.sh or bin/shutdown.bat to bring Tomcat down while you are making these changes

Install the Drivers

download the MySQL JDBC drivers from http://www.mysql.com/downloads/api-jdbc-stable.html.
After unpacking the file you have downloaded, you'll find a file called something like mysql-connector-java-3.0.10-stable-bin.jar.
Copy this file into the common/lib directory of your Tomcat installation.

Configure Tomcat

The configuration is different for Conflence 2.2 onwards due to an upgrade to Tomcat 5.5

For users of Confluence 2.2 and later

If you are using the Standalone distribution. edit the conf/server.xml file in your Tomcat installation. Users running their own Tomcat instance must edit the xml file where they declared the Confluence Context descriptor.

If editing conf/server.xml, find the following lines:

<Context path="" docBase="../confluence" debug="0" reloadable="true">
                    <!-- Logger is deprecated in Tomcat 5.5. Logging configuration for Confluence is specified in confluence/WEB-INF/classes/log4j.properties -->

Within the Context tags, directly after the opening <Context.../> line, insert the DataSource Resource tag:
```
<Resource name="jdbc/confluence" auth="Container" type="javax.sql.DataSource"
         username="yourusername"
         password="yourpassword"
         driverClassName="com.mysql.jdbc.Driver"
         url="jdbc:mysql://localhost:3306/confluence?autoReconnect=true"
         validationQuery="Select 1" />
```
- Replace the username and password parameters with the correct values for your database
- In the url parameter, replace the word 'confluence' with the name of the database your confluence data will be stored in.
- If you plan to use non-latin characters, you will also need to add "&useUnicode=true&characterEncoding=utf8" on the end of the above URL. These options are not required for any database other than MySQL.

For users of Confluence 2.1.x and earlier

Edit the conf/server.xml file in your Tomcat installation

Find the following lines:

<Context path="" docBase="../confluence" debug="0" reloadable="true">
       <Logger className="org.apache.catalina.logger.FileLogger" prefix="atlassian-confluence."
       suffix=".log" timestamp="true"/>

Directly after the <Logger.../> line, (before the next </Context> line), insert the following:

<Resource name="jdbc/confluence" auth="Container" type="javax.sql.DataSource"/>
<ResourceParams name="jdbc/confluence">
    <parameter>
         <name>factory</name>
         <value>org.apache.commons.dbcp.BasicDataSourceFactory</value>
    </parameter>
    <parameter>
         <name>maxActive</name>
         <value>20</value>
    </parameter>
    <parameter>
         <name>maxIdle</name>
         <value>10</value>
    </parameter>
    <parameter>
        <name>maxWait</name>
        <value>10000</value>
    </parameter>
    <parameter>
        <name>username</name>
        <value>yourusername</value>
    </parameter>
    <parameter>
        <name>password</name>
        <value>yourpassword</value>
    </parameter>
    <parameter>
        <name>driverClassName</name>
        <value>com.mysql.jdbc.Driver</value>
    </parameter>
    <parameter>
        <name>url</name>
        <value>jdbc:mysql://localhost:3306/confluence?autoReconnect=true</value>
    </parameter>
</ResourceParams>

You may want to choose different maxActive and maxIdle values: these are how many total database connections will be allowed at one time, and how many will be kept open even when there is no database activity
Replace the username and password parameters with the correct values for your database
In the url parameter, replace the word 'confluence' with the name of the database your confluence data will be stored in.
If you plan to use non-latin characters, you will also need to add &useUnicode=true&characterEncoding=utf8 on the end of the above URL. These options are not required for any database other than MySQL.

Configure the Confluence web application

Edit confluence/WEB-INF/web.xml in your confluence installation

Go to the end of the file and just before </web-app>, insert the following:

<resource-ref>
        <description>Connection Pool</description>
        <res-ref-name>jdbc/confluence</res-ref-name>
        <res-type>javax.sql.Datasource</res-type>
        <res-auth>Container</res-auth>
    </resource-ref>

Configure Confluence

If you have not yet set up Confluence
- Follow the steps in the Confluence Setup Guide
- In the Database Setup section, choose the "Datasource Connection" option.
- Set the JNDI name to java:comp/env/jdbc/confluence
- Set the Database dialect to MySQL.
If you are changing an existing Confluence installation over to using a Tomcat datasource
- Find your ConfluenceHome directory (see: Where Is My ConfluenceHome Directory? if you don't know where it is).
- Edit the confluence.cfg.xml file
- Delete any line that contains a property that begins with hibernate.
- Insert the following at the start of the <properties> section.
```
<property name="hibernate.setup"><![CDATA[true]]></property>
    <property name="hibernate.dialect"><![CDATA[net.sf.hibernate.dialect.MySQLDialect]]></property>
    <property name="hibernate.connection.datasource"><![CDATA[java:comp/env/jdbc/confluence]]></property>
```

Restart Confluence

Run bin/startup.sh or bin/startup.bat to start Tomcat with the new settings.

F.A.Q.

I see "Can't call commit when autocommit=true" during an upgrade of Confluence or otherwise.

Check out http://jira.atlassian.com/browse/CONF-1710 This error can be fixed by adding:
&relaxAutoCommit=true
to the end of your JDBC url.

Example:
jdbc:mysql://localhost/confdb?autoReconnect=true&relaxAutoCommit=true

This JDBC url can be found in your confluence.cfg.xml file located in your confluence home folder.