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I have a legacy Java servlet that is currently running in a Tomcat container. I want to run it outside the container, as a standalone Java application. The primary intention in doing so is because the new role in which this application will be deployed, involves only computation, and no servicing of requests.
How should I go about modifying the servlet code? Will pulling out the servlet’s init() code into the main() method of a new class help?
I would transform the servlet class into a main class, as you mentioned. The main method of the new class will create an instance of main class, execute init method to initialise if (potentially using the arguments received from the command line). Then invoke the service method inside a try/catch/finally block and invoke the destroy method of the servlet inside the finally block. Of course, your new service method will be invoked without parameters and will not contain any references to the servlet api.