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Clover is an award winning code coverage and testing tool for Java and Groovy. It integrates easily with Maven, Ant, Grails, Eclipse and IntelliJ IDEA as well as with continuous integration servers such as Bamboo, Jenkins or Hudson. Note: before Clover 4.0 this artifact was named com.cenqua.clover:clover.

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package org.openclover.util;

import com.atlassian.clover.util.FileUtils;
import org.jetbrains.annotations.Nullable;

import java.io.File;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.security.CodeSource;

/**
 * A Util class used for manipulating and querying the System Class path.
 */
public class ClassPathUtil {

    /**
     * Returns full path to a Clover JAR file or null if it was unable to determine.
     * @return String path or null
     */
    @Nullable
    public static String getCloverJarPath() {
        // first approach: try to locate the class as the resource using class loader
        String pathToClass = "/"+ ClassPathUtil.class.getName().replace('.','/') + ".class";
        URL url = ClassPathUtil.class.getResource(pathToClass);

        if (url != null) {
            String path = url.toString();
            try {
                String uri = null;
                // jar:file:!/path/to/clover.jar/com/atlassian/clover/util/ClassPathUtil.class
                if (path.startsWith("jar:file:")) {
                    int bang = path.indexOf("!");
                    uri = path.substring(4, bang);
                }
                // file:/path/to/classes/directory/com/atlassian/clover/util/ClassPathUtil.class
                else if (path.startsWith("file:")) {
                    int tail = path.indexOf(pathToClass);
                    uri = path.substring(0, tail);
                }
                if (uri != null) {
                    return (new File(FileUtils.fromURI(uri))).getAbsolutePath();
                }
            } catch (Exception e) {
                return null;
            }
        }

        // second approach: try to locate source using protection domain (case for clover.jar packed as OSGI bundle)
        try
        {
            CodeSource code = ClassPathUtil.class.getProtectionDomain().getCodeSource();
            if (code != null) {
                URI uri = code.getLocation().toURI();
                // reference:file:/path/to/clover.jar
                if ("reference".equals(uri.getScheme())) {
                    return (new File(FileUtils.fromURI(uri.getSchemeSpecificPart()))).getAbsolutePath();
                }
                // file:/path/to/classes/directory
                else if ("file".equals(uri.getScheme())) {
                    return (new File(FileUtils.fromURI(uri.toString()))).getAbsolutePath();
                }
            }
        } catch (SecurityException | URISyntaxException ex) {
            return null;
        }

        // no success
        return null;
    }

}