In addition to specifying a class name, the $class property in a properties file can be used to define an instance of a serialized JavaBean. A serialized JavaBean can be obtained from an IDE tool; you can also create one with the ObjectOutputStream class. These files have a .ser suffix, and are stored in the CLASSPATH.

The value of the $class attribute should be a name of the form x.y. This first looks for a file x/y.ser in your CLASSPATH. If that file does not exist, Nucleus loads the class x.y. Nucleus uses the standard JavaBean utility method Beans.instantiate to implement this feature.

By default, the checkForSerFiles property of the top-level Nucleus component is set to false. This improves performance by disabling checks for .ser files.

To check for .ser files, modify this property by setting the checkForSerFiles to true. For example, your <ATG11dir>/home/localconfig/Nucleus.properties might include this setting:

checkForSerFiles=true