[ACCEPTED]-In Maven, how can I dynamically build a property value at runtime?-properties

Accepted answer

Score: 41

Mojo's Build-Helper Maven Plugin can help 13 you out here.

There are a number of goals 12 that can be used to help transform properties.

There 11 is

Probably regex-property is the one you want, but if 10 your version numbers conform to the "standards" the 9 other two might save you.

To use the regex-property goal 8 you would do something like

<project>
  ...
  <build>
    <plugins>
      <plugin>
        <groupId>org.codehaus.mojo</groupId>
        <artifactId>build-helper-maven-plugin</artifactId>
        <version>1.7</version>
        <executions>
          <execution>
            <id>regex-property</id>
            <goals>
              <goal>regex-property</goal>
            </goals>
            <configuration>
              <name>tag.version</name>
              <value>${project.version}</value>
              <regex>^([0-9]+)\.([0-9]+)\.([0-9]+)\.([0-9]+)\.(-SNAPSHOT)?$</regex>
              <replacement>V$1_$2_$3_P$4</replacement>
              <failIfNoMatch>true</failIfNoMatch>
            </configuration>
          </execution>
        </executions>
      </plugin>
    </plugins>
  </build>
  ...
</project>

Note: my regex 7 might be slightly off so you should test 6 the above.

Note: The property value will 5 only be available for executions after the 4 phase that this execution is bound to. The 3 default phase that it is bound to is validate but 2 if you are on a different lifecycle (e.g. the 1 site lifecycle) the value will not be available.

Score: 5

You can use maven build-helper plugin, in 4 particular its regex-property mojo. Take a look at usage examples (scroll 3 to Set a property by applying a regex replacement to a value section).

Basically you want something 2 like that in your pom to get myVersionTag property inferred 1 from myValue:

<project>
  ...
  <build>
    <plugins>
      <plugin>
        <groupId>org.codehaus.mojo</groupId>
        <artifactId>build-helper-maven-plugin</artifactId>
        <version>1.7</version>
        <executions>
          <execution>
            <id>regex-property</id>
            <goals>
              <goal>regex-property</goal>
            </goals>
            <configuration>
              <name>myVersionTag</name>
              <value>$\{myValue}</value>
              <regex>(\d+)\.(\d+)\.(\d+)\.(\d+)</regex>
              <replacement>V_$1_$2_$3_P$4</replacement>
            </configuration>
          </execution>
        </executions>
      </plugin>
    </plugins>
  </build>
  ...
</project>

Score: 3

Ihor Kaharlichenko's answer is basically 10 correct except that it copies an error from 9 the Codehaus documentation. There should be no '\' between the 8 '$' and the '{'. The mojo works without it and doesn't work with it. Truly, with a basic 7 understanding of regex and Maven, I couldn't 6 see what the backslash was supposed to do 5 and indeed it's wrong.

Stephen Connolly's 4 answer correctly omits the backslash. Be 3 careful.
This error has proliferated throughout 2 SO and with Codehaus out of business will 1 probably never get fixed.

Source: stackoverflow.com

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