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1.4. Migrating Maven Projects

Overview
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JBoss A-MQ 6.1 now has a JBoss A-MQ BOM (Bill of Materials), which defines the versions of all the JBoss A-MQ Maven artifacts. You can use the BOM to simplify migration of your Maven POM files. Instead of updating the version elements on each Maven dependency, all you need to do is to import the latest JBoss A-MQ BOM, which defines default versions for all of the dependencies provided by JBoss A-MQ.

JBoss A-MQ BOM
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The JBoss A-MQ BOM is a parent POM that defines the versions for all of the Maven artifacts provided by JBoss A-MQ. The JBoss A-MQ BOM exploits Maven's dependency management mechanism to specify default versions for the Maven artifacts, so that it is no longer necessary to specify the artifact versions explicitly in your POM.

Current version of the JBoss A-MQ BOM
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The easiest way to discover the current version of the JBoss A-MQ BOM is to examine one of the sample pom.xml files from the quickstarts examples. For example, in the InstallDir/quickstarts/eip/pom.xml file, you can find a line that defines the JBoss A-MQ BOM version, as follows: 
<project ...>
    ...
    <properties>
        ...
        <!-- the version of the JBoss A-MQ BOM, defining all the dependency versions -->
        <jboss.fuse.bom.version>6.1.0.redhat-379</jboss.fuse.bom.version>
    </properties>
    ...
</project>
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How to migrate Maven dependencies using the JBoss A-MQ BOM
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To migrate Maven dependencies using the JBoss A-MQ BOM, open the Maven pom.xml file for your project and edit it as follows:
  1. Define the JBoss A-MQ BOM version as a property in your pom.xml file, using the current BOM version. For example: 
    <project ...>
    ...
    <properties>
        ...
        <jboss.fuse.bom.version>6.1.0.redhat-379</jboss.fuse.bom.version>
    </properties>
    ...
</project>
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  2. Reference the JBoss A-MQ BOM parent POM in a dependencyManagement element, so that it defines default versions for the artifacts provided by JBoss A-MQ. Add the following dependencyManagement element to your pom.xml file: 
    <project ...>
    ...
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.jboss.fuse.bom</groupId>
                <artifactId>jboss-fuse-parent</artifactId>
                <version>${jboss.fuse.bom.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>
    ...
</project>
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  3. Now delete all of the version elements in your JBoss A-MQ dependencies. All of the versions defined in the JBoss A-MQ BOM will be applied automatically to your dependencies (through the Maven dependency management mechanism). For example, if you already had some Apache Camel dependencies, as follows: 
      <dependencies>
    <dependency>
      <groupId>org.apache.camel</groupId>
      <artifactId>camel-core</artifactId>
 <version>2.12.0.redhat-610379</version>
    </dependency>
    <dependency>
      <groupId>org.apache.camel</groupId>
      <artifactId>camel-blueprint</artifactId>
 <version>2.12.0.redhat-610379</version>
    </dependency>
    <dependency>
      <groupId>org.apache.camel</groupId>
      <artifactId>camel-jetty</artifactId>
 <version>2.12.0.redhat-610379</version>
    </dependency>
    ...
  </dependencies>
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    You would delete the version elements, so that the dependencies are specified as follows: 
      <dependencies>
    <dependency>
      <groupId>org.apache.camel</groupId>
      <artifactId>camel-core</artifactId>
    </dependency>
    <dependency>
      <groupId>org.apache.camel</groupId>
      <artifactId>camel-blueprint</artifactId>
    </dependency>
    <dependency>
      <groupId>org.apache.camel</groupId>
      <artifactId>camel-jetty</artifactId>
    </dependency>
    ...
  </dependencies>
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  4. In future, when you migrate to a later version of JBoss A-MQ, all that you need to do to upgrade your pom.xml file is to edit the jboss.fuse.bom.version property, so that it references the new version of the JBoss A-MQ BOM.
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