How to copy from one file to another in Maven?

Question

I have to create test war and production war, which will have a different log4j.properties file in the WEB-INF directory. I have these files log4j.properties (test war) and dev.log4j.properties (for production enivorment).

How to copy the dev.log4j.properties file into log4j.properties file for production war?

Answer 1

I solved this using the maven-resources plugin, where i created the prod directory which has the resources for production environment and copied them to WEB-INF/classes directory in process-resources phase.

<plugin>
   <groupId>org.apache.maven.plugins</groupId>
   <artifactId>maven-resources-plugin</artifactId>
 <version>2.3</version>
 <executions>
  <execution>
   <id>copy-prod-resources</id>
   <phase>process-resources</phase>
   <goals>
    <goal>copy-resources</goal>
   </goals>
   <configuration>
    <outputDirectory>webapp/WEB-INF/classes</outputDirectory>
    <resources>
     <resource>
      <directory>src/main/resources/prod</directory>
      <filtering>true</filtering>
     </resource>
    </resources>
   </configuration>
  </execution>
 </executions>
</plugin>

Answer 2

• Use Maven profiles (http://maven.apache.org/guides/introduction/introduction-to-profiles.html)
• Create a "dev" and "prod" profile, selecting an alternate set of resources for each profile. Make Dev active by default.

<profiles>
  <profile>
    <id>dev</id>
    <activation>
      <activeByDefault>true</activeByDefault>
    </activation>
    <build>
      <resources>
        <resource>
          <directory>src/main/resources/dev</directory>
        </resource>
      </resources>
    </build>
  </profile>
  <profile>
    <id>prod</id>
    <build>
      <resources>
        <resource>
          <directory>src/main/resources/prod</directory>
        </resource>
      </resources>
    </build>
  </profile>
</profiles>


• Build using the desired profile via: mvn install -Pdev or mvn install -Pprod

Answer 3

The code above didn't work for me - had to change it to the following:

<plugin>
  <artifactId>maven-resources-plugin</artifactId>
  <executions>
    <execution>
      <id>copy-prod-resources</id>
      <phase>process-resources</phase>
      <goals>
         <goal>copy-resources</goal>
      </goals>
      <configuration>
        <!-- this is important -->
        <overwrite>true</overwrite>
        <!-- this as well (target/ was missing) -->
        <outputDirectory>${basedir}/target/classes</outputDirectory>
        <resources>
          <resource>
            <directory>src/main/resources/prod</directory>
          </resource>
        </resources>
      </configuration>
    </execution>
  </executions>
</plugin>

Answer 4

Last response is working. But you need to give the version to make it work.

<plugin>
  <artifactId>maven-resources-plugin</artifactId>
  <version>2.3</version>
  <executions>
    <execution>
      <id>copy-prod-resources</id>
      <phase>process-resources</phase>
      <goals>
         <goal>copy-resources</goal>
      </goals>
      <configuration>
        <!-- this is important -->
        <overwrite>true</overwrite>
        <!-- target -->
        <outputDirectory>${basedir}/target/classes</outputDirectory>
        <resources>
          <resource>
            <!-- source -->
            <directory>src/main/resources/prod</directory>
          </resource>
        </resources>
      </configuration>
    </execution>
  </executions>
</plugin>