jBPM Polyglot

A simple experiment with GraalVM and Node.js.

• JS sources are under src/main/node. Support files and data models are under src/main/java

Running the Examples

Plain Java

This example defines a jBPM process which evaluates an Applicant (by age).

To compile and run the tests execute

 mvn clean install

Node.js app

This example defines the same jBPM process and also starts a Node.js server running on port 8080 which showcasts how easy we can use our Kodito application inside a Node.js app with GraalVM.

Ensure that you have GraalVM in your $PATH, then:

 mvn clean install -Prunnode

If you have Node.js installed and it clashes with the GraalVm node executable, then in pom.xml for the exec-maven-plugin, change

<executable>node</executable>

to

 <executable>/Library/Java/JavaVirtualMachines/graalvm-ce-19.1.1/Contents/Home/bin/node</executable>

for example (full path on your machine.

The example will run Graal's node implementation with JVM interop enabled, and Kogito (jBPM and Drools) on the classpath.

Once maven has finished you will see a console message:

 jBPM Applicant Test server running at http://127.0.0.1:8080/

Now you can access the app in your browser with that URL. First you will be presented with a very simple Applicant form:

Here enter in some random first and last name. For age, the processing rules are simple: if the applicant is over 18 the application is accepted, otherwise the applicant is not accepted.

Here you can see some outcomes given valid and invalid ages for an applicant: