How to copy a resource or another in Maven dependi

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>

Answer 5

The alternative way is to use maven-antrun-plugin

<build>
    <plugins>
        <plugin>
          <groupId>org.apache.maven.plugins</groupId>
          <artifactId>maven-antrun-plugin</artifactId>
          <version>1.7</version>
          <executions>
            <execution>
              <phase>validate</phase>
              <goals>
                <goal>run</goal>
              </goals>
              <configuration>
                <tasks>
                  <echo>build.env: ${build.env} </echo>
                  <delete file="src/main/resources/log4j.properties" />
                  <copy file="src/env/${build.env}/log4j.properties"
                        tofile="src/main/resources/log4j.properties" />
                </tasks>
              </configuration>
            </execution>
          </executions>
        </plugin>
    </plugins>
</build>

Assume resource files are in following structure:

src/
  env/
      dev/
          log4j.properties
      local/
          log4j.properties
      prod/
          log4j.properties

When do maven build, run the following commands per environment:

mvn package -Dbuild.env=dev
mvn package -Dbuild.env=local
mvn package -Dbuild.env=prod