Object Instantiating error

I have an working java code which invokes the SAP webserivce and the code is working fine. i am looking to use the same code in CF9 and getting the below error.

An exception occurred while instantiating a Java object. The class must not be an interface or an abstract class. If the class has a constructor that accepts an argument, you must call the constructor explicitly using the init(args) method. Error : ''

it looks the CF9 jars getting the conflicted with my jave classes. does any has knowledge on this error realted to webservice jars.