Maven add a folder or jar file into current classpath

Question

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    lt configuration gt    lt compilerArguments gt     lt classpath gt c  jars abc jar lt  classpath gt    lt  compilerArguments gt   lt  configuration gt    it will not work because it will override the current classpath  that includes all the dependencies   Please help me

User · Answer

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>

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 · Answer

From docs and example it is not clear that classpath manipulation is not allowed    lt configuration gt    lt compilerArgs gt     lt arg gt classpath   basedir  lib bad jar lt  arg gt    lt  compilerArgs gt   lt  configuration gt    But see Java docs  also https   www cis upenn edu  bcpierce courses 629 jdkdocs tooldocs solaris javac html      -classpath path Specifies the path javac uses to look up classes needed to run javac or being referenced by other classes you are   compiling  Overrides the default or the CLASSPATH environment variable   if it is set    Maybe it is possible to get current classpath and extend it  see in maven  how output the classpath being used        lt properties gt         lt cpfile gt cp txt lt  cpfile gt       lt  properties gt      lt plugin gt       lt groupId gt org apache maven plugins lt  groupId gt       lt artifactId gt maven-dependency-plugin lt  artifactId gt       lt version gt 2 9 lt  version gt       lt executions gt         lt execution gt           lt id gt build-classpath lt  id gt           lt phase gt generate-sources lt  phase gt           lt goals gt             lt goal gt build-classpath lt  goal gt           lt  goals gt           lt configuration gt             lt outputFile gt   cpfile  lt  outputFile gt           lt  configuration gt         lt  execution gt       lt  executions gt     lt  plugin gt    Read file  Read a file into a Maven property    lt plugin gt     lt groupId gt org codehaus gmaven lt  groupId gt     lt artifactId gt gmaven-plugin lt  artifactId gt     lt version gt 1 4 lt  version gt     lt executions gt       lt execution gt         lt phase gt generate-resources lt  phase gt         lt goals gt           lt goal gt execute lt  goal gt         lt  goals gt         lt configuration gt           lt source gt            def file   new File project properties cpfile            project properties cp   file getText            lt  source gt         lt  configuration gt       lt  execution gt     lt  executions gt   lt  plugin gt    and finally     lt plugin gt       lt groupId gt org apache maven plugins lt  groupId gt       lt artifactId gt maven-compiler-plugin lt  artifactId gt       lt version gt 3 6 1 lt  version gt       lt configuration gt         lt compilerArgs gt            lt arg gt classpath   cp    basedir  lib bad jar lt  arg gt         lt  compilerArgs gt       lt  configuration gt      lt  plugin gt

User · Answer

This might have been asked before  See Can I add jars to maven 2 build classpath without installing them   In a nutshell  include your jar as dependency with system scope  This requires specifying the absolute path to the jar    See also http   maven apache org guides introduction introduction-to-dependency-mechanism html

[maven-2] Maven: add a folder or jar file into current classpath

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