Java Prolog interface

Anyone know how to call a Prolog program from Java and vica versa?
I've heard some programs are able to do this.
I'm developing an NPL web program and need to be able to call Prolog code from Java.

thanks.

Can't you just invoke it with a Runtime.exec()?

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Originally posted by ArchAngel
Can't you just invoke it with a Runtime.exec()?

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No, i need to send parameters to prolog

What do you mean "parameters"? Can't you just pass them in on the command line?