Integrating Derby with Fuse ESB Enterprise is a relatively simple procedure. All you need to do is to set a single Java system property, which specifies the location of the Derby system.

A Derby system is essentially the directory where all of Derby's data is stored. A Derby system can contain multiple database instances, where each database instance holds its data in a sub-directory of the Derby system directory.

You are required to set one Java system property to configure the Derby system: the derby.system.home Java system property, which specifies the location of the Derby system directory.

In order to integrate Derby with Fuse ESB Enterprise, you must set the derby.system.home property in the OSGi container. Under the Fuse ESB Enterprise install directory, open the etc/system.properties file using a text editor and add the following line:

derby.system.home=DerbySystemDirectory

Where DerbySystemDirectory is any convenient location for storing your Derby data files. After setting the derby.system.home property, any Derby database instances created in the OSGi container will share the same Derby system (that is, the database instances will store their data under the specified Derby system directory).