An experiment in creating a minimal Drools web service using Spring Boot.
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An experiment in creating a minimal Drools web service using Spring Boot.

A little while back, I knocked up Qzr ( to demonstrate using Spring Boot ( with the Drools rules engine ( However, I also wanted to play around with a few more technologies (AngularJS and Spring HATEOAS), so it's a bit large for just demonstrating exposing Drools rules as an HTTP web service.

A few folks have mentioned that there was a bit too much going on for a beginner to pick out the essentials of running Drools in a Spring Boot application. So I thought I'd have a go at creating a simpler application, which does nothing more than that.

For the rules, I took my cues from the Bus Pass example in the JBPM project:

I have cut the rules down a little bit and reduced the code by replacing some of the Java fact classes with DRL declared types. I prefer this for facts which are only referenced from within the DRL.

Assuming that you have a reasonably recent install of Maven and the JDK (I have tested with 8, but I think 7 should be okay), you should be able to do the following from the command line.

Build the application:

mvn clean package

Run the application:

java -jar target/buspass-ws-1.0.0-SNAPSHOT.jar

Then send a request to the API using curl or your favourite web browser. As described by the rules, if you request a bus pass for a person with age less than 16, you should see a ChildBusPass and for someone 16 or over, you should see an AdultBusPass.

For example, opening gives me:


... and opening gives me: