Optional package (extensions) deployment using a Java install program doesn't
work on Solaris (most likely on Linux also). When the command
<javahome>/java -jar /<user>/java_plugin_AppletStore/1.4.0/ext/some.jar
is executed the plugin hangs up at this point. The Java install program never
comes up. The Java install program starts OK when run on Windows.

Hangs up at this point (from Java Console)
Launching Java installer through '/<javahome>/bin/java -jar "/<user>/java_plugin_AppletStore/1.4.0/ext/file.jar"'