startService with explicit intent is not working to start framework service

I have added MyService in android/framework/base/services/java/com/xxxx/server/ space and registered that service in AndroidManifest.xml of android/frameworks/base/core/res/.

Calling startService() of MyService, from test application is working fine with implicit intent. But explicit is not working with warning message

"Unable to start service".

I have used flag android:exported="true" and package name "com.xxxx.server", class name "com.xxxx.server.MyService"

Please let me know how do we use explicit intent with framework service.