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Drools JBoss Rules 5.0 Developer's Guide by Michal Bali, Bogdan Brinzarea

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Alternatives to Drools

For completeness, we'll also mention alternative rule engines/expert systems. These include commercial products such as ILOG (now IBM)—JRules, Fair Isaac—Blaze Advisor, Corticon's BRMS, Haley (now Oracle) Business Rules Engine, Pegasystems—PegaRules, Production Systems Technologies—OPSJ, Innovations Software. Some products for the .NET platform are: Microsoft BizTalk Server, InRule for Windows Workflow Foundation, ILOG, and Fair Isaac. Alternative open source products include CLIPS and products with dual licenses such as OpenRules or Jess.

Alternatively, you can build a rule engine yourself. It may be appropriate in some specific scenario, but most of the time you'll only be re-inventing the wheel. More importantly, your ...

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