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Chapter 1. Drools 4.0 Release Notes

1.1. What is new in Drools 4.0
1.1.1. Language Expressiveness Enhancements
1.1.2. Core Engine Enhancements
1.1.3. IDE Enhancements
1.1.4. Business Rules Management System - BRMS
1.1.5. Miscellaneous Enhancements
1.2. Upgrade tips from Drools 3.0.x to Drools 4.0.x
1.2.1. API changes
1.2.2. Rule Language Changes
1.2.3. Drools Update Tool
1.2.4. DSL Grammars in Drools 4.0
1.2.5. Rule flow Update for 4.0.2

Drools 4.0 is a major update over the previous Drools 3.0.x series. A whole new set of features were developed which special focus on language expressiveness, engine performance and tools availability. The following is a list of the most interesting changes.

As mentioned before Drools 4.0 is a major update over the previous Drools 3.0.x series. Unfortunately, in order to achieve the goals set for this release, some backward compatibility issues were introduced, as discussed in the mail list and blogs.

This section of the manual is a work in progress and will document a simple how-to on upgrading from Drools 3.0.x to Drools 4.0.x.