How to use OTA API in java

I am new to java and I need to know if it is possible to use OTA API in java and run the application in Linux.

Using com4j I generated the java class files for OTAClient.dll and I am trying to initialize connection with ALM server but it fails with an error saying "no such method found in the interface ITDConnection" in the below line of code

ITDConnection itdc = ClassFactory.createTDConnection();

I am using ALM12.5. I cannot use REST API as the functionality which am trying to develop is not available in it yet.

Thanks in advance.