2 Jars with same class name. NoSuchMethod. Can't change classpath

Question

I have overloaded a method in a class that came with an openSource package.
Things were fine until I implemented my components in a new version of the Server application; when I discovered that the it uses the same openSource package bundled in its classpath.
This results into a NoSuchMethod exception since I have overloaded the method with new argument types.
1. I cannot remove or shuffle this JAR from the Server's classpath, since that would stop something else.
2. I cannot change my code since it is implemented in a lot of places.
Has anyone called a specific method of a jar? like E.g. "someJar.jar".SomeClass.someMethod (arg);
If yes how?
The above code is not possible syntactically, but I have put it for ease in interpreting the problem.
Any input will be appreciated.
NOTE: I cannot disclose the names of products for company policy issues.

Answer 1

Just some ideas...
1. I cannot remove or shuffle this JAR from the
Server's classpath, since that would stop something
else.Some servers allow for multiple classpaths - i.e. you can separately specify the classpath that the server itself uses from the one that your hosted applications will be using.
Also, if your changes to the openSource code are only the addition of an overloaded method, why couldn't you just substitute your jar for the one the server is using, why would that break the server?
2. I cannot change my code since it is implemented in
a lot of places.That sounds lame. You can't do a global replace? How about just changing the package name?
Has anyone called a specific method of a jar? like
E.g. "someJar.jar".SomeClass.someMethod (arg);
If yes how?Yes, but it's not as simple as your pseudo-code...
You can use URLClassLoader to load a specific class from a specific jar file URL, and then use reflection to get the method you want from it, and then call it.
good luck
j