Basis Errors and Solutions

Symptom

If you have a look at the http requests of the plugin, you will see all kind of failed GET requests for classes and resources. This is a problem of the Java PlugIn classloader architecture. By default, the classloader does not confine its search to the jars of the archive tag, but starts http requests for class files.
Other terms

ACF; ACF UpDownload, ACFExecute, codebase_lookup, Java 6
Reason and Prerequisites

This patch only helps if the end-user has installed Java 6 (JRE or JDK) on the client. There is no workaround available for earlier releases unless Sun decides to downport their fix.
Solution

On our request, Sun has addressed this issue with Java 6 and introduced a new java applet parameter “codebase_lookup”. If the parameter is present and its value is “false”, the Java Runtime Environment 6 applet classloader behaves as required.