android - Multidex application in Eclipse

I've developed an android application in Eclipse which uses lot of library JAR files so i got exception of

Unable to execute dex: method ID not in [0, 0xffff]: 65536

So i thought to implement multidex. I searched many blogs but nothing helps me in the eclipse framework. So i installed the Gradle plugin for eclipse to achive the multidex which was mentioned in many posts (As mentioned here, and Here). Both telling the same method to add

multiDexEnabled true

but its not working

I asked my application class to override

@Override
protected void attachBaseContext(Context base) {
    super.attachBaseContext(base);
    MultiDex.install(this);
}

and in the gradle file which is builded i edited as

    android{
            defaultConfig {
                 minSdkVersion 14 //lower than 14 doesn't support multidex
                 targetSdkVersion 22

                 // Enabling multidex support.
                 multiDexEnabled true

             }
     }

But it doesn't helped me. Can anyone help me to find how to multidex my application with eclipse or correct way to multidex with the gradle.