Configuring your OpenXava application to go against Db2 is very simple,
basically you have to install the JDBC driver for Db2 and define correctly
the datasource. You don't need to touch any code of your application. Configuration for Db2
We assume you have already
installed and running Db2.
Download the JDBC driver for Db2
Download the Db2 driver from here: https://www.ibm.com/support/pages/db2-jdbc-driver-versions-and-downloads
In the download page choose the driver for your Db2 version. It takes you
to another page where you have to choose IBM Data Server Driver for
JDBC and SQLJ (JCC Driver)
. It will ask you to register, afterwards
you will be able to download the driver. You will download a file like
numbers may vary). Uncompress it, inside the jdbc_sqlj
will find db2_db2driver_for_jdbc_sqlj.zip
. Uncompress this zip too
to find inside db2jcc4.jar
. This last file, the .jar, is the JDBC
controller we're going to use.
Create a classpath variable in Eclipse
In order you can connect to Db2 from Eclipse we're going to declare a
classpath variable that points to the Db2 JDBC driver, so you can use it
in any project you need easily. For that, in Eclipse go to Window >
Preferences > Java > Build Path > Classpath Variables where
you can add the new variable:
You can call the variable
DB2_DRIVER instead of DB_DRIVER if your prefer. The path is the path of
the JDBC driver, in our case the path of db2jcc4.jar we have just
Add the DB_DRIVER variable to your Eclipse project
In the project you're going to use Db2 you have to add the variable
declared above. Click with right mouse button on your project and then
choose Java Build Path > Configure Build Path...
Then select the Libraries
With this we have the driver
available for the development environment.
Add the JDBC driver to the production Tomcat
the driver in production is much easier. Copy db2jcc4.jar
to the lib folder of your Tomcat. Done.
Adjust your datasource definition
For development edit web/META-INF/context.xml of your Eclipse
project, and for production edit conf/context.xml of your Tomcat
to adjust the datasource to point to Db2, something like this:
<Resource name="jdbc/MyAppDS" auth="Container"
maxTotal="100" maxIdle="20" maxWaitMillis="10000"
The differences are the driverClassName
and the url. The final part of the url, myappdb in
this example, is the name of your Db2 database. Obviously, instead of localhost
you should put the address of the server that hosts Db2, and also put the
correct username and password.
You don't need to touch the default
persistence unit of persistence.xml
), unless you use hibernate.dialect
property in which case just remove hibernate.dialect
However, you have to modify the junit
persistence unit to point to
<!-- JUnit Db2 -->
<property name="hibernate.connection.driver_class" value="com.ibm.db2.jcc.DB2Driver"/>
<property name="hibernate.connection.username" value="root"/>
<property name="hibernate.connection.password" value="ao49fmsk"/>
<property name="hibernate.connection.url" value="jdbc:db2://localhost:50000/myappdb"/>
Adapt the username, password
and url to your Db2 configuration.