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The maven-scala-plugin is used for compiling/testing/running/documenting scala code in maven.
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/*
 * Copyright 2007 scala-tools.org
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 */
package org_scala_tools_maven;

import org.codehaus.plexus.util.StringUtils;
import org_scala_tools_maven_executions.JavaMainCaller;
import org_scala_tools_maven_executions.JavaMainCallerByFork;
import org_scala_tools_maven_executions.MainHelper;


/**
 * Run a Scala class using the Scala runtime
 *
 * @goal run
 * @requiresDependencyResolution test
 * @execute phase="test-compile"
 */
public class ScalaRunMojo extends ScalaMojoSupport {

    /**
     * The class to use when launching a scala program
     *
     * @parameter expression="${launcher}"
     */
    protected String launcher;

    /**
     * Additional parameter to use to call the main class
     * Using this parameter only from command line ("-DaddArgs=arg1|arg2|arg3|..."), not from pom.xml.
     * @parameter expression="${addArgs}"
     */
    protected String addArgs;

    /**
     * A list of launcher definition (to avoid rewriting long command line or share way to call an application)
     * launchers could be define by :
     *      *   <launchers>
     *     <launcher>
     *       <id>myLauncher</id>
     *       <mainClass>my.project.Main</mainClass>
     *       <args>
     *         <arg>arg1</arg>
     *       </args>
     *       <jvmArgs>
     *         <jvmArg>-Xmx64m</jvmArg>
     *       </jvmArgs>
     *     </launcher>
     *     <launcher>
     *       <id>myLauncher2</id>
     *       ...
     *       <><>
     *     </launcher>
     *   </launchers>
     * 
     * @parameter
     */
    protected Launcher[] launchers;

    /**
     * Main class to call, the call use the jvmArgs and args define in the pom.xml, and the addArgs define in the command line if define.
     *
     * Higher priority to launcher parameter)
     * Using this parameter only from command line (-DmainClass=...), not from pom.xml.
     * @parameter expression="${mainClass}"
     */
    protected String mainClass;

    @Override
    @SuppressWarnings("unchecked")
    protected void doExecute() throws Exception {
        JavaMainCaller jcmd = null;
        if (StringUtils.isNotEmpty(mainClass)) {
            jcmd = new JavaMainCallerByFork(this, mainClass, MainHelper.toMultiPath(project.getTestClasspathElements()), jvmArgs, args, forceUseArgFile);
        } else if ((launchers != null) && (launchers.length > 0)) {
            if (StringUtils.isNotEmpty(launcher)) {
                for(int i = 0; (i < launchers.length) && (jcmd == null); i++) {
                    if (launcher.equals(launchers[i].id)) {
                        getLog().info("launcher '"+ launchers[i].id + "' selected => "+ launchers[i].mainClass );
                        jcmd = new JavaMainCallerByFork(this, launchers[i].mainClass, MainHelper.toMultiPath(project.getTestClasspathElements()), launchers[i].jvmArgs, launchers[i].args, forceUseArgFile);
                    }
                }
            } else {
                getLog().info("launcher '"+ launchers[0].id + "' selected => "+ launchers[0].mainClass );
                jcmd = new JavaMainCallerByFork(this, launchers[0].mainClass, MainHelper.toMultiPath(project.getTestClasspathElements()), launchers[0].jvmArgs, launchers[0].args, forceUseArgFile);
            }
        }
        if (jcmd != null) {
            if (StringUtils.isNotEmpty(addArgs)) {
                jcmd.addArgs(StringUtils.split(addArgs, "|"));
            }
            jcmd.run(displayCmd);
        } else {
            getLog().warn("Not mainClass or valid launcher found/define");
        }
    }
}