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Spring Servlet Process Application (using JBoss AS 7)

This example demonstrates how to deploy a spring powered webapplication which

  • includes a @ProcessApplication class and some BPMN 2.0 processes
  • starts a Spring Webapplication context
  • uses a shared container managed process engine and Spring Beans as expression and delegate expression in the processes

Why is this example interesting?

This example shows how to combine a @ProcessApplication class, a processes.xml and a spring applicationContext into a fully fledged process application with all it's advantages, including a managed container shared process engine paired with the power of spring beans inside your processes.

Show me the important parts!

We create a process application class which extends the ServletProcessApplication and annotate it with @ProcessApplication, so the camunda bpm platform can pick it up and register the process application without any further actions:

@ProcessApplication
public class SpringServletProcessApplication extends ServletProcessApplication {
  ...
}

Through the META-INF/processes.xml, we can define process archives and additional options, like creating new engines when deploying the process application:

<?xml version="1.0" encoding="UTF-8"?>
<process-application
    xmlns="http://www.camunda.org/schema/1.0/ProcessApplication"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.camunda.org/schema/1.0/ProcessApplication http://www.camunda.org/schema/1.0/ProcessApplication ">

  <process-archive>
    <properties>
      <property name="isDeleteUponUndeploy">true</property>
    </properties>

  </process-archive>

</process-application>

Additionally you have to package the camunda-engine-spring module as a maven compile time dependency like:

<dependency>
  <groupId>org.camunda.bpm</groupId>
  <artifactId>camunda-engine-spring</artifactId>
  <version>7.0.0-Final</version>
  <scope>compile</scope>
</dependency>

How to use it?

  1. Build it with maven, it will download the camunda bpm JBoss AS7 distribution and execute the included Arquillian test.
  2. Watch out for this console log:
Invoking @PostDeploy annotation in org.camunda.bpm.example.spring.jboss.servlet.SpringServletProcessApplication
Starting testResolveBean processdefinition
org.camunda.bpm.example.spring.jboss.servlet.ExampleBean is currently invoked.
Starting testResolveBeanFromJobExecutor processdefinition
org.camunda.bpm.example.spring.jboss.servlet.ExampleDelegateBean is currently invoked.
...
Invoking @PreUndeploy annotation in org.camunda.bpm.example.spring.jboss.servlet.SpringServletProcessApplication
Undeploying SpringServletProcessApplication-Example