MyClass.class.getProtectionDomain().getCodeSource().getLocation().getPath();

String yourJarName="yourJarName.jar";
String Jar_path= MyClass.class.getProtectionDomain().getCodeSource().getLocation().getPath().replace(yourJarName,"").substring(1);

String yourJarName="yourJarName.jar";
    String Jar_path= MyClass.class.getProtectionDomain().getCodeSource().getLocation().getPath().replace(yourJarName,"");