如何从一个 Maven 项目创建两个 jars 但具有不同的资源文件

Question

I have a single maven project that has multiple folders in src/main/resources, I want to generate two Jars, one include src/main/resources/folder1/all properties and the other include src/main/resources/folder2/all properties.

Is their a way to achive this? If not, what is the simplest way to achive my goal?

Answer 1

From Introduction to Build Profiles

Profiles can be activated in the Maven settings, via the section. This section takes a list of elements, each containing a profile-id inside.

<settings>
  ...
  <activeProfiles>
    <activeProfile>profile-1</activeProfile>
  </activeProfiles>
 ...
</settings>

Profiles listed in the tag would be activated by default every time a project use it. Profiles can be automatically triggered based on the detected state of the build environment. These triggers are specified via an section in the profile itself. Currently, this detection is limited to prefix-matching of the JDK version, the presence of a system property or the value of a system property.

This allows to create a different package content based on the target environment.

Answer 2

If I understood your problem correctly then you can use " Maven Assembly plugin " and " The Assembly Descriptor " in the following way: first of all, you can not use a profile if you want to build 2 jar files simultaneously. So, my suggestion is to exclude your config files from your jar then use Maven Assembly plugin to create a different zip file with these folders.

for example, in your case you should have 2 file descriptors like the following:

               <plugin>
                <artifactId>maven-assembly-plugin</artifactId>
                <executions>
                    <execution>
                        <id>folder1</id>
                        <phase>package</phase>
                        <goals>
                            <goal>single</goal>
                        </goals>
                        <configuration>
                            <descriptors>
                                <descriptor>src/main/java/descriptors/folder1.xml</descriptor>
                            </descriptors>
                        </configuration>
                    </execution>
                </executions>
            </plugin>

and folder1.xml contains:

<assembly>
    <id>folder1</id>
    <formats>
        <format>zip</format>
    </formats>
    <files>
        <file>
            <source>
                target/${project.artifactId}-${project.version}-yourJar.jar
            </source>
            <outputDirectory>/</outputDirectory>
        </file>
    </files>
    <fileSets>
        <fileSet>
            <directory>${project.basedir}/src/main/resources/folder1</directory>
            <includes>
                <include>*</include>
            </includes>
            <outputDirectory>/config</outputDirectory>
        </fileSet>
    </fileSets>
</assembly>

for "folder2" you can do it in the same way.

also for exclude some config files from the jar you can use this plugin:

<plugin>
  <groupId>org.apache.maven.plugins</groupId>
  <artifactId>maven-jar-plugin</artifactId>
  <version>2.3</version>
  <configuration>
    <excludes>
      <exclude>**/*.properties</exclude>
    </excludes>                    
    <archive>
      <manifest>
        <addClasspath>true</addClasspath>
        <classpathPrefix>lib/</classpathPrefix>
        <mainClass>package.path.to.your.main.class.MainClass</mainClass>
      </manifest>
      <manifestEntries>
        <Class-Path>conf/</Class-Path>
      </manifestEntries>
    </archive>
  </configuration>
</plugin>

Using maven-resources-plugin as follows:

  <plugin>
      <groupId>org.apache.maven.plugins</groupId>
      <artifactId>maven-resources-plugin</artifactId>
      <version>2.3</version>
      <executions>
        <execution>
          <id>copy-resources</id>
          <phase>install</phase>
          <goals>
            <goal>copy-resources</goal>
          </goals>
          <configuration>
            <outputDirectory>${basedir}/target/conf</outputDirectory>
            <resources>
              <resource>
                <directory>src/main/resources</directory>
                <includes>
                  <include>**/*.properties</include>
                </includes>
              </resource>
            </resources>
          </configuration>
        </execution>
      </executions>
    </plugin>