I have created RESTful services in java/netbeans using the Jersey Library. Now i want to secure this service using oAuth 2.0.
Are there any libraries or any tutorial to achieve that? I couldn't find anything useful in google.
You can use Apache Oltu (formerly Apache Amber): https://cwiki.apache.org/confluence/display/OLTU/Documentation
The Authorization Server and Resource Server sections explain how to secure your REST services.