URL url = getClass().getProtectionDomain().
                getCodeSource().getLocation();
    String urlStr = "jar:" + url.toString() + "META-INF/MANIFEST.MF";
    urlStr = urlStr.replaceAll(".ear/", ".ear/!/");
//    urlStr = urlStr.replaceAll(".jar/", ".jar/!/");
    url = new URL(urlStr);
    log.trace("path={}", url.toString());
    Manifest manifest = new Manifest(url.openStream());
    Attributes attr = manifest.getMainAttributes();
    Object oValue = attr.getValue("implementation-build");
    return oValue.toString();

      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-ejb-plugin</artifactId>
        <configuration>
          <archive>
            <manifest>
              <addClasspath>true</addClasspath>
            </manifest>
            <manifestEntries>
              <SCM-Revision>${buildNumber}</SCM-Revision>

<implementation-build>${project.version}.${buildNumber}</implementation-build>
            </manifestEntries>
          </archive>
        </configuration>
      </plugin>

    InputStream s = clazz.getClassLoader().getResourceAsStream(
       "META-INF/MANIFEST.MF");
    Manifest manifest = new Manifest();
    try {
      manifest.read(s);
    } catch (IOException e) {
      return null;
    }
    Attributes attr = manifest.getMainAttributes();
    return attr.getValue("implementation-build").toString();