Implementation Blueprint

# Update standard packages
sudo apt-update && sudo apt upgrade -y

# Install OpenJDK 11
sudo apt install openjdk-11-jdk -y

# Install PostgreSQL for the backend database
sudo apt install postgresql postgresql-contrib -y

# Install Apache Tomcat 9
sudo apt install tomcat9 tomcat9-admin -y

sudo -u postgres psql

CREATE DATABASE yawl;
CREATE USER yawluser WITH PASSWORD 'secure_production_password';
GRANT ALL PRIVILEGES ON DATABASE yawl TO yawluser;
\q

# Assuming you have downloaded the YAWL distribution ZIP
unzip yawl-x.y.zip -d /opt/yawl

# Copy the WAR files to Tomcat's webapps directory
sudo cp /opt/yawl/engine/yawl.war /var/lib/tomcat9/webapps/
sudo cp /opt/yawl/resourceservice/resourceService.war /var/lib/tomcat9/webapps/

<!-- Example Hibernate overrides for PostgreSQL -->
<property name="hibernate.connection.driver_class">org.postgresql.Driver</property>
<property name="hibernate.connection.url">jdbc:postgresql://localhost:5432/yawl</property>
<property name="hibernate.connection.username">yawluser</property>
<property name="hibernate.connection.password">secure_production_password</property>
<property name="hibernate.dialect">org.hibernate.dialect.PostgreSQLDialect</property>

sudo systemctl restart tomcat9

const express = require('express');
const app = express();
app.use(express.text({type: 'application/xml'})); // YAWL Engine sends XML payloads

app.post('/my-custom-yawl-service', (req, res) => {
    // 1. Parse the incoming YAWL task XML payload
    console.log("Received task from YAWL engine:", req.body);
    
    // 2. Execute target business logic (e.g., updating an external CRM)
    updateCRM();
    
    // 3. Return success payload back to YAWL to complete the task
    const responseXML = `<response><status>Success</status></response>`;
    res.status(200).send(responseXML);
});

app.listen(8080, () => console.log('YAWL custom service listening on port 8080'));