Last 6 months

KIE & Log4j2 exploit CVE-2021-44228

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Log4J 2.x is a widely used Java logging framework. Unfortunately a few days ago it has been exposed to an important security vulnerability (“Log4Shell”, CVE-2021-44228).  The whole KIE ecosystem (Kogito, Drools, OptaPlanner and jBPM) moved to SLF4J, a different logging facade with Logback as default implementation, a few years ago and it is therefore notRead more →

Last Year

Quarking Drools: How we turned a 13-year-old Java project into a first-class serverless component

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“The question of whether a computer can think is no more interesting than the question of whether a submarine can swim.” – Edsger W. Dijkstra Rule-based artificial intelligence (AI) is often overlooked, possibly because people think it’s only useful in heavyweight enterprise software products. However, that’s not necessarily true. Simply put, a rule engine isRead more →

All other

Last call for DMN webinar on October 18, 2018

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Are you interested to know more on how Drools provides an open source execution engine with full DMN support at conformance level 3? This is your last change to register for tomorrow’s free webinar presented by Phil Simpson and Denis Gagne on October 18 at 1pm ET. Don’t miss it!

DMN webinar on October 18, 2018

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Rule engines are a powerful yet flexible tool to define and implement huge sets of business requirements and constraints. While Drools Rule Language (DRL) may be appealing to define business rules for technically savvy domain experts, a new visual based standard has emerged in the Decision Management space to bridge the gap between technical andRead more →

The Drools Executable Model is alive

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Overview The purpose of the executable model is to provide a pure Java-based representation of a rule set, together with a convenient Java DSL to programmatically create such model. The model is low level and designed for the user to provide all the information it needs, such as the lambda’s for the index evaluation. ThisRead more →

Drools Canonical Model – Pure Java Rules

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Rule engines, like Drools, typically  make use of a custom languages to define a set of rules. For example, he Drools compiler translates a drl file to an internal representation (the KiePackages) that is subsequently used to generate the ReteOO/Phreak network that will perform the rules evaluation. This internal representation was never really intended toRead more →

Drools Executable Model (Rules in pure Java)

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The Executable Model is a re-design of the Drools lowest level model handled by the engine. In the current series (up to 6.x) the executable model has grown organically over the last 8 years, and was never really intended to be targeted by end users. Those wishing to programmatically write rules were advised to doRead more →