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Asked: 2026-05-10T22:30:16+00:00

I have a really simple Java class that effectively decorates a Map with input

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I have a really simple Java class that effectively decorates a Map with input validation, with the obvious void set() and String get() methods.

I’d like to be able to effectively call those methods and handle return values and exceptions from outside the JVM, but still on the same machine Update: the caller I have in mind is not another JVM; thanks @Dave Ray

My implementation considerations are typical

  • performance
  • ease of implementation and maintenance (simplicity?)
  • reliability
  • flexibility (i.e. can I call from a remote machine, etc.)

Is there a ‘right way?’ If not, what are my options, and what are the pro/cons for each?

(Stuff people have actually done and can provide real-life feedback on would be great!)

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1 Answer

  1. Ok. Here’s another try now that I know the client is not Java. Since you want out-of-process access and possibly remote machine access, I don’t think JNI is what you want since that’s strictly in-process (and a total hassle). Here are some other options:

    Raw Sockets : just set up a listener socket in Java and accept connections. When you get a connection read the request and send back a response. Almost every language can use sockets so this is a pretty universal solution. However, you’ll have to define your own marshalling scheme, parsing, etc.

    XML-RPC : this isn’t as hip these days, but it’s simple and effective. There are Java libraries as well as libraries in most other languages.

    CORBA : as mentioned above, CORBA is an option, but it’s pretty complicated and experts are getting harder to come by.

    Web Server : set up an embedded web server in your app and handle reqests. I’ve heard good things about Jetty or you can use the one provided with Java. I’ve used the latter successfully to server KML files to Google Earth from a simulation written in Java. Most other languages have libraries for making HTTP requests. How you encode the data (XML, text, etc) is up to you.

    Web Services : This would be more complicated I think, but you could use JAX-WS to expose you objects as web services. NetBeans has pretty nice tools for building Web Services, but this may be overkill.

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