The jBPM 6 full installer out of the box ships with the H2 Database for saving the Process Persistence data. Besides H2, there is already included a file db/mysql_module.xml which is a template for configuring MySQL as Database. In this tutorial have have described how to configure the installer to use MySQL database: Introduction to jBPM 6

Configuring jBPM 6 with PostgreSQL database

If you are using another Database such as PostgreSQL then you have a couple of additional steps. First of all, before launching the full installer to use PostgreSQL, configure the build.properties file:

#H2.version=1.3.168
#db.name=h2
#db.driver.jar.name=h2-${H2.version}.jar
#db.driver.download.url=http://repo1.maven.org/maven2/com/h2database/h2/${H2.version}/h2-${H2.version}.jar

#postgresql
db.name=postgresql
db.driver.module.prefix=org/postgresql
db.driver.jar.name=postgresql-9.1-902.jdbc4.jar
db.driver.download.url=https://repository.jboss.org/nexus/content/repositories/thirdparty-uploads/postgresql/postgresql/9.1-902.jdbc4/postgresql-9.1-902.jdbc4.jar

As you can see, we have commented the default H2 database and uncommented the postgresql section.

Now move to the db folder and create a file named: postgresql_module.xml:

<module xmlns="urn:jboss:module:1.0" name="com.postgres">
   <resources>
     <resource-root path="postgresql-9.1-902.jdbc4.jar"/>
   </resources>

   <dependencies>
      <module name="javax.api"/>
      <module name="javax.transaction.api"/>
    </dependencies>
</module>

This file is the module declaration for the JDBC Driver that will be imported in the application server.

Next, still in the db folder, edit the file jbpm-persistence-JPA2.xml so that the PostgreSQL dialect is specified:

   <!--   <property name="hibernate.dialect" value="org.hibernate.dialect.H2Dialect" />-->
 <property name="hibernate.dialect" value="org.hibernate.dialect.PostgreSQLDialect" />

Finally, in the application server configuration file (default standalone-full-wildfly-8.2.1.Final.xml ), you will need declaring the Datasource definition:

<subsystem xmlns="urn:jboss:domain:datasources:2.0">
    <datasources>
        <datasource jta="true" jndi-name="java:jboss/datasources/jbpmDS" pool-name="PostgreDS" enabled="true" use-java-context="true" use-ccm="true">
            <connection-url>jdbc:postgresql://localhost/jbpm</connection-url>
            <driver>postgresql</driver>
            <security>
                <user-name>postgres</user-name>
                <password>postgres</password>
            </security>
        </datasource>
        <drivers>
            <driver name="postgresql" module="org.postgresql">
                <xa-datasource-class>org.postgresql.Driver</xa-datasource-class>
            </driver>
        </drivers>
    </datasources>
</subsystem>

  This step can be executed as well after the installation is completed. In this latter case you will need to modify the resulting configuration file (e.g. standalone-full.xml).

Now execute the full installer and you are done!

$ ant install.demo