Each service unit in the service assembly must be its own project. These projects are placed at the same level as the service assembly project. The contents of a service unit's project depends on the component at which the service unit is targeted. At the minimum, a service unit project contains a POM and an XML configuration file.

Fuse ESB provides Maven artifacts for a number of service unit types. They can be used to seed a project with the smx-arch command. As shown in Example C.3, the smx-arch command takes three arguments. The groupId value and the artifactId values correspond to the project's group ID and artifact ID.

	Important
	The double quotes(") are required when using the -DgroupId argument and the -DartifactId argument.

The suArchetypeName specifies the type of service unit to seed. Table C.1 lists the possible values and describes what type of project is seeded.

The contents of your service unit project change from service unit to service unit. Different components require different configuration. Some components, such as the Fuse Service Framework service engine, require that you include Java classes.

At a minimum, a service unit project will contain two things:

You configure the Maven plug-in to package the results of the project build as a service unit by changing the value of the project's packaging element to jbi-service-unit as shown in Example C.4.

<project ...>
  <modelVersion>4.0.0</modelVersion>

  ...
  <groupId>com.widgets.demo.cxf-wsdl-first</groupId>
  <artifactId>cxfse-wsdl-first-su</artifactId>
  <name>CXF WSDL Fisrt Demo :: SE Service Unit</name>
  <packaging>jbi-service-unit</packaging>
  ...
</project>

Example C.5 shows the configuration for a service unit targeting the Fuse Service Framework binding component.

...
<dependencies>
  <dependency>
    <groupId>org.apache.servicemix</groupId>
    <artifactId>servicemix-cxf-bc</artifactId>
    <version>3.3.1.0-fuse</version>[]
  </dependency>
>/dependencies>
...

The advantage of using the Maven dependency mechanism is that it allows Maven to verify if the targeted component is deployed in the container. If one of the components is not deployed, Fuse ESB will not hold off deploying the service unit until all of the required components are deployed.

	Tip
	Typically, a message identifying the missing component(s) is written to the log.

If your service unit's targeted component is not available as a Maven artifact, you can specify the targeted component using the componentName element. This element is added to the standard Maven properties block and it specifies the name of a targeted component, as specified in Example C.6.

...
<properties>
  <componentName>servicemix-bean</componentName>
</properties>
...

Example C.7 shows the POM file for a project that is building a service unit targeted to the Fuse Service Framework binding component.

<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
                             http://maven.apache.org/maven-v4_0_0.xsd">

    <modelVersion>4.0.0</modelVersion>

    <parent> 
        <groupId>com.widgets.demo</groupId>
        <artifactId>cxf-wsdl-first</artifactId>
        <version>1.0</version>
    </parent>

  <groupId>com.widgets.demo.cxf-wsdl-first</groupId>
  <artifactId>cxfse-wsdl-first-su</artifactId>
  <name>CXF WSDL Fisrt Demo :: SE Service Unit</name>
  <packaging>jbi-service-unit</packaging> 

  <dependencies> 
    <dependency>
      <groupId>org.apache.servicemix</groupId>
      <artifactId>servicemix-cxf-bc</artifactId>
      <version>3.3.1.0-fuse</version>
    </dependency>
  >/dependencies>

  <build>
    <plugins>
      <plugin> 
        <groupId>org.apache.servicemix.tooling</groupId>
        <artifactId>jbi-maven-plugin</artifactId>
        <extensions>true</extensions>
      </plugin>
    </plugins>
  </build>
</project>

The POM file in Example C.7 does the following: