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Chapter 3. Apache Maven and Red Hat Process Automation Manager Spring Boot applications


Apache Maven is a distributed build automation tool used in Java application development to create, manage, and build software projects. Maven uses standard configuration files called Project Object Model (POM) files to define projects and manage the build process. POM files describe the module and component dependencies, build order, and targets for the resulting project packaging and output using an XML file. This ensures that the project is built in a correct and uniform manner.

A Maven repository stores Java libraries, plug-ins, and other build artifacts. The default public repository is the Maven 2 Central Repository, but repositories can be private and internal within a company to share common artifacts among development teams. Repositories are also available from third parties.

You can use the online Maven repository with your Spring Boot projects or you can download the Red Hat Process Automation Manager Maven repository. The recommended approach is to use the online Maven repository with your Spring Boot projects. Maven settings used with a repository manager or repository on a shared server provide better control and manageability of projects.

After you create your Red Hat Process Automation Manager Spring Boot project, configure it with the online Maven Repository to store your application data.

Prerequisites

  • You have created a Red Hat Process Automation Manager Spring Boot project.

Procedure

  1. In the directory that contains your Red Hat Process Automation Manager Spring Boot application, open the <BUSINESS-APPLICATION>-service/pom.xml file in a text editor or IDE, where <BUSINESS-APPLICATION> is the name of your Spring Boot project.
  2. Add the following repository to the repositories element:

    <repository>
      <id>jboss-enterprise-repository-group</id>
      <name>Red Hat JBoss Enterprise Maven Repository</name>
      <url>https://maven.repository.redhat.com/ga/</url>
      <layout>default</layout>
      <releases>
        <updatePolicy>never</updatePolicy>
      </releases>
      <snapshots>
        <updatePolicy>daily</updatePolicy>
      </snapshots>
    </repository>
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  3. Add the following plug-in repository to the pluginRepositories element:

    Note

    If your pom.xml file does not have the pluginRepositories element, add it as well.

    <pluginRepository>
      <id>jboss-enterprise-repository-group</id>
      <name>Red Hat JBoss Enterprise Maven Repository</name>
      <url>https://maven.repository.redhat.com/ga/</url>
      <layout>default</layout>
      <releases>
        <updatePolicy>never</updatePolicy>
      </releases>
      <snapshots>
        <updatePolicy>daily</updatePolicy>
      </snapshots>
    </pluginRepository>
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    Doing this adds the productized Maven repository to your business application.

If you do not want to use the online Maven repository, you can download and configure the Red Hat Process Automation Manager Maven repository. The Red Hat Process Automation Manager Maven repository contains many of the requirements that Java developers typically use to build their applications. This procedure describes how to edit the Maven settings.xml file to configure the Red Hat Process Automation Manager Maven repository.

Note

When you configure the repository by modifying the Maven settings.xml file, the changes apply to all of your Maven projects.

Prerequisites

  • You have created a Red Hat Process Automation Manager Spring Boot project.

Procedure

  1. Navigate to the Software Downloads page in the Red Hat Customer Portal (login required) and then select the following product and version from the drop-down options:

    • Product: Process Automation Manager
    • Version: 7.12
  2. Download Red Hat Process Automation Manager 7.12 Maven Repository (rhpam-7.12.0-maven-repository.zip).
  3. Extract the downloaded archive.
  4. Change to the ~/.m2/ directory and open the Maven settings.xml file in a text editor or integrated development environment (IDE).
  5. Add the following lines to the <profiles> element of the Maven settings.xml file, where <MAVEN_REPOSITORY> is the path of the Maven repository that you downloaded. The format of <MAVEN_REPOSITORY> must be file://$PATH, for example file:///home/userX/rhpam-7.12.0.GA-maven-repository/maven-repository.

    <profile>
      <id>red-hat-enterprise-maven-repository</id>
      <repositories>
        <repository>
          <id>red-hat-enterprise-maven-repository</id>
          <url>MAVEN_REPOSITORY</url>
          <releases>
            <enabled>true</enabled>
          </releases>
          <snapshots>
            <enabled>false</enabled>
          </snapshots>
        </repository>
      </repositories>
      <pluginRepositories>
        <pluginRepository>
          <id>red-hat-enterprise-maven-repository</id>
          <url><MAVEN_REPOSITORY></url>
          <releases>
            <enabled>true</enabled>
          </releases>
          <snapshots>
            <enabled>false</enabled>
          </snapshots>
        </pluginRepository>
      </pluginRepositories>
    </profile>
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  6. Add the following lines to the <activeProfiles> element of the Maven settings.xml file and save the file.

    <activeProfile>red-hat-enterprise-maven-repository</activeProfile>
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Important

If your Maven repository contains outdated artifacts, you might encounter one of the following Maven error messages when you build or deploy your project, where <ARTIFACT_NAME> is the name of a missing artifact and <PROJECT_NAME> is the name of the project you are trying to build:

  • Missing artifact <PROJECT_NAME>
  • [ERROR] Failed to execute goal on project <ARTIFACT_NAME>; Could not resolve dependencies for <PROJECT_NAME>

To resolve the issue, delete the cached version of your local repository located in the ~/.m2/repository directory to force a download of the latest Maven artifacts.

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