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When doing a "KieBuilder::buildAll", mvel dialect tries to import all functions looking for the class in the classpath first, which takes too long, and then in drools, which is pretty faster. I propose to exchange the order in which they are looked for a better performance.

In my tests it's about 33%-50% faster. (in a DRL with 1000 rules and 50 function it goes from 10s to 6s the ::buildAll)


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An open source rule engine, DMN engine and complex event processing (CEP) engine for Java™ and the JVM Platform.

Drools is a business rule management system with a forward-chaining and backward-chaining inference based rules engine, allowing fast and reliable evaluation of business rules and complex event processing. A rule engine is also a fundamental building block to create an expert system which, in artificial intelligence, is a computer system that emulates the decision-making ability of a human expert.

Be sure to check out the Drools' project website and documentation!

Developing Drools and jBPM

If you want to build or contribute to a kiegroup project, read this document.

It will save you and us a lot of time by setting up your development environment correctly. It solves all known pitfalls that can disrupt your development. It also describes all guidelines, tips and tricks. If you want your pull requests (or patches) to be merged, please respect those guidelines.