» Installing Drools

Windows, Mac and Linux (Ubuntu):

  1. Download and install Eclipse IDE for Java Developers (2021-09). You might want to create a new workspace for your LSP projects.

  2. Download Drools 7.63.0 and extract the zip archive to any folder.

  3. Install JBoss Tools 4.21.0:

    • Run Eclipse IDE.

    • Select Help > Eclipse Marketplace….

    • Install JBoss Tools 4.21.0.Final

    • We will only need JBoss Tools Java Standard Tools. The other tools are optional.

  4. Install the Drools Eclipse Integration:

    • Select Help > Install New Software….

    • In the Work with: combo box type: https://download.jboss.org/drools/release/7.48.0.Final/org.drools.updatesite/

    • Click Select all.

    • Make sure the checkbox “Contact all update sites during install to find required software” is checked.

  5. Create Drools Runtime:

    • Select Preferences > Drools > Installed Drools Runtime > Add… .

    • Choose any name and select the folder binaries of the drools archive, you have installed in Step 2. The version is determined automatically.

    • Click OK > Apply and Close

  6. Create Test Project:

    • In Eclipse switch to the Drools perspective (Window > Perspective > Open Perspective > Other > Drools).

    • Choose File > New > Drools Project

    • Now you can choose to create a new project with example files and click Next.

    • Enter a project name, select the drools runtime created earlier, and select Add a sample HelloWorld rule file to this project. Click Finish.

    • Open the class that contains the main method. It is located in the package com.sample.

    • In order to execute the project, right-click the editor and select Debug As > Drools Application. Observe the output.

    • You can ignore the SLF4J warnings or download the latest version and add the slf4j-simple-x.x.xx.jar to the project’s build path (right click the project > Build Path > Add External Archives > choose slf4j-simple-x.x.xx.jar > OK).