in jbpm user guide , mention can deploy the delegate classes to jbpm database at 18.2.2. The process class loader

Delegation classes are loaded with the process class loader of their respective process definition. The process class loader is a class loader that has the jBPM classloader as a parent. The process class loader adds all the classes of one particular process definition. You can add classes to a process definition by putting them in the /classes folder in the process archive. Note that this is only useful when you want to version the classes that you add to the process definition. If versioning is not necessary, it is much more efficient to make the classes available to the jBPM class loader.

If the resource name doesn't start with a slash, resources are also loaded from the /classes directory in the process archive. If you want to load resources outside of the classes directory, start with a double slash ( // ). For example to load resource data.xml wich is located next to the processdefinition.xml on the root of the process archive file, you can do clazz.getResource("//data.xml") or classLoader.getResourceAsStream("//data.xml") or any of those variants.

which table used for storing the classes. thx.