+3  A: 

My guess is that MATLAB requires you to access it from exactly one thread. You say it works in a single threaded application, perhaps you need to start a dedicated thread for interacting with MATLAB to get this to work correctly.

See also
http://stackoverflow.com/questions/248421/thread-safety-of-matlab-engine-api

Adam Goode  2010-01-04 05:18:08
If this is the case, How do I start a dedicated thread in java?
HH  2010-01-04 05:32:10
Well, it depends on the specifics of how you interface with MATLAB. Can you give an example of the Java code you use to call your jar? You probably want to create a thread before you call into your jar at all.
Adam Goode  2010-01-04 05:41:31
`new Thread(...).start()`
Stephen C  2010-01-04 05:41:35
A good book for this is Java Concurrency in Practice. Or look at http://java.sun.com/javase/6/docs/api/java/util/concurrent/package-summary.html
Adam Goode  2010-01-04 05:43:33

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