To use Spin with a process engine, the relevant Spin libraries have to be on the engine’s classpath. Furthermore, the process engine plugin provided by Spin has to be registered with the engine. When using a pre-built Camunda distribution, Spin is already integrated.

There are two types of Spin artifacts:

• camunda-spin-core: a jar that contains only the core Spin classes. In addition to camunda-spin-core, single data format artifacts like camunda-spin-dataformat-json-jackson and camunda-spin-dataformat-xml-dom exist that provide the JSON and XML functionality. These dependencies should be used when the default data formats have to be reconfigured or when custom data formats are used.
• camunda-spin-dataformat-all: a single jar without dependencies that contains the XML and JSON data formats.
• camunda-engine-plugin-spin: a process engine plugin which adds Spin to the Camunda BPM platform.

Maven coordinates

camunda-spin-core

camunda-spin-core contains Spin’s core classes that every data format implementation requires. Additionally, XML and JSON data formats can be included with the dependencies camunda-spin-dataformat-json-jackson and camunda-spin-dataformat-xml-dom. These artifacts will transitively pull in their dependencies, like Jackson in the case of the JSON data format. For integration with the engine, the artifact camunda-engine-plugin-spin is needed. Given that the BOM is imported, the Maven coordinates are as follows:

<dependency>
  <groupId>org.camunda.spin</groupId>
  <artifactId>camunda-spin-core</artifactId>
</dependency>

<dependency>
  <groupId>org.camunda.spin</groupId>
  <artifactId>camunda-spin-dataformat-json-jackson</artifactId>
</dependency>

<dependency>
  <groupId>org.camunda.spin</groupId>
  <artifactId>camunda-spin-dataformat-xml-dom</artifactId>
</dependency>

<dependency>
  <groupId>org.camunda.bpm</groupId>
  <artifactId>camunda-engine-plugin-spin</artifactId>
</dependency>

camunda-spin-dataformat-all

This artifact contains the XML and JSON dataformats as well as their dependencies. To avoid conflicts with other versions of these dependencies, Spin’s dependencies are relocated to different packages. camunda-spin-dataformat-all has the following Maven coordinates:

<dependency>
  <groupId>org.camunda.spin</groupId>
  <artifactId>camunda-spin-dataformat-all</artifactId>
</dependency>

Configuring the Spin Process Engine Plugin

camunda-engine-plugin-spin contains a class called org.camunda.spin.plugin.impl.SpinProcessEnginePlugin that can be registered with a process engine using the plugin mechanism. For example, a bpm-platform.xml file with the plugin enabled would look as follows:

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

  ...

  <process-engine name="default">
    ...

    <plugins>
      <plugin>
        <class>org.camunda.spin.plugin.impl.SpinProcessEnginePlugin</class>
      </plugin>
    </plugins>

    ...
  </process-engine>

</bpm-platform>