So the existing .aar file does not work with Axis2, and you also can't create a new one?
If deploying an .aar file doesn't work, then there should be an error message in the server logs. Or is that the stack trace you posted?
What does "Not able to generate a WSDL" mean, exactly? If your service does not deploy, then there can't possibly be a WSDL, right?
Is there any patch available for axis2 kernel 1.6.2. jar file?
No. Axis2 consists of multiple jar files (as should be obvious if you look into the WEB-INF/lib directory), updating just a single one won't work.