Maven: add a folder or jar file into current classpath

user_405855 0
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I am using maven-compile plugin to compile classes. Now I would like to add one jar file into the current classpath. That file stays in another location (let's say c:/jars/abc.jar . I prefer to leave this file here). How can I do that?

If I use classpath in the argument:

<configuration>
 <compilerArguments>
  <classpath>c:/jars/abc.jar</classpath>
 </compilerArguments>
</configuration>

it will not work because it will override the current classpath (that includes all the dependencies)

classpath jar maven-2
4 Answers

The classpath setting of the compiler plugin are two args. Changed it like this and it worked for me:

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-compiler-plugin</artifactId>
    <version>3.6.1</version>
    <configuration>
      <compilerArgs>
         <arg>-cp</arg>
         <arg>${cp}:${basedir}/lib/bad.jar</arg>
      </compilerArgs>
    </configuration>
   </plugin>

I used the gmavenplus-plugin to read the path and create the property 'cp':

<plugin>
        <!--
          Use Groovy to read classpath and store into
          file named value of property <cpfile>

          In second step use Groovy to read the contents of
          the file into a new property named <cp>

          In the compiler plugin this is used to create a
          valid classpath
        -->
        <groupId>org.codehaus.gmavenplus</groupId>
        <artifactId>gmavenplus-plugin</artifactId>
        <version>1.12.0</version>
        <dependencies>
          <dependency>
            <groupId>org.codehaus.groovy</groupId>
            <artifactId>groovy-all</artifactId>
            <!-- any version of Groovy \>= 1.5.0 should work here -->
            <version>3.0.6</version>
            <type>pom</type>
            <scope>runtime</scope>
          </dependency>
        </dependencies>
        <executions>
          <execution>
            <id>read-classpath</id>
            <phase>validate</phase>
            <goals>
              <goal>execute</goal>
            </goals>
          </execution>

        </executions>
        <configuration>
          <scripts>
            <script><![CDATA[
                    def file = new File(project.properties.cpfile)
                    /* create a new property named 'cp'*/
                    project.properties.cp = file.getText()
                    println '<<< Retrieving classpath into new property named <cp> >>>'
                    println 'cp = ' + project.properties.cp
                  ]]></script>
          </scripts>
        </configuration>
      </plugin>
user_148492950

We mixed two of the answers found here to solve a similar problem. Our project needs a JAR only in compile stage, but add a local dependency, using system scope, it is unuseful because Maven refuse the artifact publication with an error related to a missing dependency.

The snippets used are the following:

  <properties>
    <classpathfile>${basedir}/classpathfile.classpath</classpathfile>
  </properties>

      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-dependency-plugin</artifactId>
        <version>2.9</version>
        <executions>
          <execution>
            <id>build-classpath</id>
            <phase>generate-sources</phase>
            <goals>
              <goal>build-classpath</goal>
            </goals>
            <configuration>
              <outputFile>${classpathfile}</outputFile>
            </configuration>
          </execution>
        </executions>
      </plugin>
      <plugin>
        <groupId>org.codehaus.gmaven</groupId>
        <artifactId>gmaven-plugin</artifactId>
        <version>1.4</version>
        <executions>
          <execution>
            <phase>generate-resources</phase>
            <goals>
              <goal>execute</goal>
            </goals>
            <configuration>
              <source>
                def file = new File(project.properties.classpathfile)
                project.properties.originalClassPath = file.getText()
              </source>
            </configuration>
          </execution>
        </executions>
      </plugin>

      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.8.1</version>
        <configuration>
          <compilerArgs>
            <arg>-cp</arg>
            <arg>${originalClassPath}${path.separator}${basedir}/../../../bin/POM_RUNTIME_PLACEHOLDER/ExtraJar.jar</arg>
          </compilerArgs>
        </configuration>
      </plugin>

Maven is able to compile and successfully deploy the artifacts. If anyone is interested the full POM is available in GitHub under project NuReflector, defaultPOM.template under src/NuReflector.

user_112605980
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