Pad Number With Zeros in Maven

Question

Is there a way to have maven pad a numeric value (ex: build number) within a POM? I've been googling the topic and haven't come up with anything yet.

My use case is as follows. The maven build process is provided a build number via Jenkins which needs to be included as part of the name of the WAR that is generated. So if I provide it 12 as the build number, then I want the WAR file name to be myWar##000012.war. The ##000012 part of the name is the version identifier used by Tomcat.

Answer 1

The simplest solution may be to embed a scripting language in your build. For example, with Groovy, if you have a buildNumber property:

   <plugin>
    <groupId>org.codehaus.mojo</groupId>
    <artifactId>groovy-maven-plugin</artifactId>
    <version>1.5</version>
    <executions>
     <execution>
     <phase>validate</phase>
     <goals><goal>execute</goal></goals>
     <configuration>
      <source>
       project.properties['nameSuffix'] = "##" + String.format("%06d", project.properties['buildNumber'].toLong());
      </source>
     </configuration>
     </execution>
    </executions>
   </plugin>

Afterwards the nameSuffix property is available to define the final name.

Alternatively, as suggested in In Maven, how can I dynamically build a property value at runtime?, use build-helper:regex-property to transform the string.