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The JaCoCo Maven Plugin provides the JaCoCo runtime agent to your tests and allows basic report creation.
There is a newer version: 0.8.12
/*******************************************************************************
 * Copyright (c) 2009, 2016 Mountainminds GmbH & Co. KG and Contributors
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *    Chas Honton, Marc R. Hoffmann - initial implementation
 *
 *******************************************************************************/
package org.jacoco.maven;

import static java.lang.String.format;

import java.io.File;
import java.io.IOException;
import java.net.InetAddress;

import org.apache.maven.plugin.MojoExecutionException;
import org.jacoco.core.tools.ExecDumpClient;
import org.jacoco.core.tools.ExecFileLoader;

/**
 * 
 * Request a dump over TCP/IP from a JaCoCo agent running in
 * tcpserver mode.
 * 
 * 
 * 
 * Note concerning parallel builds: While the dump goal as such is thread safe,
 * it has to be considered that TCP/IP server ports of the agents are a shared
 * resource.
 * 
 * 
 * @goal dump
 * @phase post-integration-test
 * @threadSafe
 * @since 0.6.4
 */
public class DumpMojo extends AbstractJacocoMojo {

	/**
	 * Path to the output file for execution data.
	 * 
	 * @parameter property="jacoco.destFile"
	 *            default-value="${project.build.directory}/jacoco.exec"
	 */
	private File destFile;

	/**
	 * If set to true and the execution data file already exists, coverage data
	 * is appended to the existing file. If set to false, an existing execution
	 * data file will be replaced.
	 * 
	 * @parameter property="jacoco.append" default-value="true"
	 */
	private boolean append;

	/**
	 * Sets whether execution data should be downloaded from the remote host.
	 * 
	 * @parameter property="jacoco.dump" default-value="true"
	 */
	private boolean dump;

	/**
	 * Sets whether a reset command should be sent after the execution data has
	 * been dumped.
	 * 
	 * @parameter property="jacoco.reset" default-value="false"
	 */
	private boolean reset;

	/**
	 * IP address or hostname to connect to.
	 * 
	 * @parameter property="jacoco.address"
	 */
	private String address;

	/**
	 * Port number to connect to. If multiple JaCoCo agents should run on the
	 * same machine, different ports have to be specified for the agents.
	 * 
	 * @parameter property="jacoco.port" default-value="6300"
	 */
	private int port;

	/**
	 * Number of retries which the goal will attempt to establish a connection.
	 * This can be used to wait until the target JVM is successfully launched.
	 * 
	 * @parameter property="jacoco.retryCount" default-value="10"
	 */
	private int retryCount;

	@Override
	public void executeMojo() throws MojoExecutionException {
		final ExecDumpClient client = new ExecDumpClient() {
			@Override
			protected void onConnecting(final InetAddress address,
					final int port) {
				getLog().info(
						format("Connecting to %s:%s", address,
								Integer.valueOf(port)));
			}

			@Override
			protected void onConnectionFailure(final IOException exception) {
				getLog().info(exception.getMessage());
			}
		};
		client.setDump(dump);
		client.setReset(reset);
		client.setRetryCount(retryCount);

		try {
			final ExecFileLoader loader = client.dump(address, port);
			if (dump) {
				getLog().info(
						format("Dumping execution data to %s",
								destFile.getAbsolutePath()));
				loader.save(destFile, append);
			}
		} catch (final IOException e) {
			throw new MojoExecutionException("Unable to dump coverage data", e);
		}
	}

}