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How about <a href="http://herzberg.ca.sandia.gov/jess/" rel="ugc">http://herzberg.ca.sandia.gov/jess/</a>
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How about http://herzberg.ca.sandia.gov/jess/ [http://herzberg.ca.sandia.gov/jess/]

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Jess is free to download but not to use. When I looked into it last year, the author wanted $15,000 to license for commercial use. However, Jess is based on the CLIPS engine, written in C++. It should be possible to wrap it in such a way that you could use it from Java. CLIPS is released as public domain software.<br />
<br />
Jim
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Jess is free to download but not to use. When I looked into it last year, the author wanted $15,000 to license for commercial use. However, Jess is based on the CLIPS engine, written in C++. It should be possible to wrap it in such a way that you could use it from Java. CLIPS is released as public domain software.

Jim

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Hmm. Seems I forgot the URL to CLIPS. Find it here:<br />
<a href="http://www.ghg.net/clips/CLIPS.html" rel="ugc">http://www.ghg.net/clips/CLIPS.html</a>
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Hmm. Seems I forgot the URL to CLIPS. Find it here:
http://www.ghg.net/clips/CLIPS.html [http://www.ghg.net/clips/CLIPS.html]

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I'm looking for a good quality, free (preferably Free, though not full GPL) rules engine which would allow me to separate my business logic from my Java code. I'm not looking for a knowledge engine like Mandarax; I want a declarative engine which can make decisions and call back into the Java code based upon those decisions. Being based on XML would be nice, as the rules will eventually be edited through a graphical interface. Speed is also important, as the engine may be placed under a heavy load.
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I'm looking for a good quality, free (preferably Free, though not full GPL) rules engine which would allow me to separate my business logic from my Java code. I'm not looking for a knowledge engine like Mandarax; I want a declarative engine which can make decisions and call back into the Java code based upon those decisions. Being based on XML would be nice, as the rules will eventually be edited through a graphical interface. Speed is also important, as the engine may be placed under a heavy load.

Business Rules Engine

Java is a platform-independent, object-oriented programming language and run-time environment, designed to have as few implementation dependencies as possible such that developers can write one set of code across all platforms using libraries. Most devices will not run Java natively, and require a run-time component to be installed in order to execute a Java program.