FileNet developing applet for Workflows

Question

I'm developing an applet which will be used as step processor for FileNet Workflows. I wrote some simple applets based on swing and awt and compiled sample applet from IBM documentation, but every integration tries end with the same result - "System error". I'm making configuration changes point by point. I think configuration is exactly the problem I've got.

Can somebody help me with configuring just one applet? step by step?

@Add1 The problem with error is that it's just "System error" and it's all.

OK. Steps which i've done:

1. Made an applet based on SWING, just 1 JLabel and 2 JButtons.
2. Compiled an applet. Applet class is org.Applet
3. Copied .jar with applet to filenet_installation_directory\WorkplaceXT\download
4. In filenet_installation_directory\WorkplaceXT\eprocess\stepprocs\java copied ootb folder (FileNet applet) and changed name to myApplet. Also name of .jsp file in that directory.
5. Opened .jsp file and make changes adding version to jarVersionValues variable, changing applet class name in appletClassName property to org.Applet and changing .jar name in jarArchiveValues property to name of .jar with applet.
6. In filenet_installation_directory\Workplace\UI-INF\jsp\ui\eprocess\stepprocs\java copied ootb folder and changed name of folder to myApplet and name of .jsp page inside directory to myApplet.jsp
7. In .jsp file set WcmString topic = new WcmString("server.myApplet_jsp.topic", "My Custom Step Processor");
8. After that I'm adding an applet to Process Configuration Console. In region properties, in steps tab I'm adding new step processor, type java, class org.myApplet, path java\myApplet\myApplet.jsp
9. After that I have step processor in Process Designer, but when I start a workflow and try to start a task than a "System Error" appears.