Framework Client-Side Classes
If you are using any frameworks other than the Apple-provided WebObjects frameworks that include client-side classes, you will need to manually copy the framework's client-side .jar files into your WebServerResources/Java directory and add an entry to the ClasspathClient.txt file for each one.
WebObjects seems to be able to find its own client-side classes from within the Library/Frameworks directory, but it cannot find any others.
For example, I have a framework named MyFoundation.framework that has a couple classes in it that are used by the client-side of my application. In order for WO to find these classes, they must be in a Jar located in the MyApp.woa/Contents/WebServerResources/Java/. You will then need to make sure that the ClasspathClient.txt classpath file has an entry pointing to it.
APPROOT/WebServerResources/Java/MyFoundation.jar
You can also modify the build.xml and xml| files to go grab all the client-side jar files from the local frameworks directory (Usually /Library/Frameworks) using the following addition:
<!-- the Java Client Client-Side Classes -->
<copy todir="${dest.dir}/${project.name}/WEB-INF/${project.name}.woa/Contents/WebServerResources/Java">
<fileset dir="${wo.wolocalroot}/Library/Frameworks">
<include name="**/WebServerResources/Java/*.jar"/>
</fileset>
<mapper type="flatten"/>
</copy>