Windows, Mac and Linux (Ubuntu):

1. Download and install Eclipse IDE for Java Developers (2022-09). You might want to create a new workspace for your LSP projects.

2. Download Drools 7.73.0 and extract the zip archive to any folder.

3. Install JBoss Tools 4.25.0:

   • Run Eclipse IDE.

   • Select Help > Eclipse Marketplace….

   • Install JBoss Tools 4.25.0.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).