Executing code modules (seperate jars) from main program (main.jar)

Hi all
Sorry if i am crossposting, but i dont think that is the case.
I have a main program ( in a jar ) and some modules to be executed and run in the main program.
Theese components are packed a module in a single jar, and all theese jars are located in the same folder as the main program.
The main classes in the module jars implement a interface known to the main tool, so that i can use them.
My problem are, how to load the modules?
I know i can use JarFile to get the manifests, and thereby get the name of the main class in each jar (they get obfuscated before launch, so no hardcoding of names).
But how do i instanciate the mainclasses in the modules from the main tool ?
hope you can help out.
-Anders

You can't. I understand the module approach as many others have similar designs. The first problem is that you need to add all the JARs to your classpath so that these JARs are known during starttime. There is no other solution to this if you don't write your own classloader that fetches classes during runtime and work peacefully with the other classloaders of the VM (it's a pain in the ass!). So, your main application needs to know the JAR files. Then it's a small step to also register the modules that your main app should know. Our approach is to have a small database table that holds the fully referenced class names of the modules that are available and can be used via Class.forName(). With this solution, we just need to stop the main app, copy the new JAR, adjust the classpath to add the new JAR, and restart the main app. After adding the new module names to the config table, the main app automatically uses them. Instead of a database table you can use e.g. a properties file.

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