Over a million developers have joined DZone.
{{announcement.body}}
{{announcement.title}}

Accessing An Artifact’s Maven And SCM Versions At Runtime

DZone's Guide to

Accessing An Artifact’s Maven And SCM Versions At Runtime

· Java Zone
Free Resource

Just released, a free O’Reilly book on Reactive Microsystems: The Evolution of Microservices at Scale. Brought to you in partnership with Lightbend.

You can easily tell Maven to include the version of the artifact and its Git/SVN/… revision in the JAR manifest file and then access that information at runtime via getClass().getPackage.getImplementationVersion().

(All credit goes to Markus Krüger and other colleagues.)

Include Maven artifact version in the manifest

(Note: You will actually not want to use it, if you also want to include a SCM revision; see below.)

pom.xml:

  <project>...
  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-jar-plugin</artifactId>
        ...
        <configuration>
          <archive>
            <manifest>
              <addDefaultImplementationEntries>true</addDefaultImplementationEntries>
              <addDefaultSpecificationEntries>true</addDefaultSpecificationEntries>
            </manifest>
          </archive>
        </configuration>
        ...
      </plugin>
    </plugins>
  </build>
  ...
</project>

The resulting MANIFEST.MF of the JAR file will then include the following entries, with values from the indicated properties:

Built-By: ${user.name}
Build-Jdk: ${java.version}
Specification-Title: ${project.name}
Specification-Version: ${project.version}
Specification-Vendor: ${project.organization.name
Implementation-Title: ${project.name}
Implementation-Version: ${project.version}
Implementation-Vendor-Id: ${project.groupId}
Implementation-Vendor: ${project.organization.name}

(Specification-Vendor and Implementation-Vendor come from the POM’s organization/name.)

Include SCM revision

For this you can either use the Build Number Maven plugin that produces the property ${buildNumber}, or retrieve it from environment variables passed by Jenkinsor Hudson (SVN_REVISION for Subversion, GIT_COMMIT for Git).

For git alone, you could also use the maven-git-commit-id-plugin that can either replace strings such as ${git.commit.id} in existing resource files (using maven’s resource filtering, which you must enable) with the actual values or output all of them into a git.properties file.

Let’s use the buildnumber-maven-plugin and create the manifest entries explicitely, containing the build number (i.e. revision)

<project>
    <build>
        <plugins>
          <plugin>
                <!-- Create the property $buildNumber holding the current Git revision -->
                <groupId>org.codehaus.mojo</groupId>
                <artifactId>buildnumber-maven-plugin</artifactId>
                <version>1.2</version>
                <executions>
                    <execution>
                        <phase>validate</phase>
                        <goals>
                            <goal>create</goal>
                        </goals>
                    </execution>
                </executions>
                <configuration>
                    <doCheck>false</doCheck>
                    <doUpdate>false</doUpdate>
                </configuration>
            </plugin>
 
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-jar-plugin</artifactId>
                <version>2.4</version>
                <configuration>
                    <archive>
                        <manifestEntries>
                            <Implementation-Title>${project.name}</Implementation-Title>
                            <!-- buildNumber is produced at runtime by buildnumber-maven-plugin -->
                            <Implementation-Version>${project.version} ${buildNumber}</Implementation-Version>
                        </manifestEntries>
                    </archive>
                </configuration>
            </plugin>
...


Accessing the version & revision

As mentioned above, you can access the manifest entries from your code via getClass().getPackage.getImplementationVersion() andgetClass().getPackage.getImplementationTitle().

References



Strategies and techniques for building scalable and resilient microservices to refactor a monolithic application step-by-step, a free O'Reilly book. Brought to you in partnership with Lightbend.

Topics:

Published at DZone with permission of Jakub Holý, DZone MVB. See the original article here.

Opinions expressed by DZone contributors are their own.

{{ parent.title || parent.header.title}}

{{ parent.tldr }}

{{ parent.urlSource.name }}