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The JAX-RS is a Java specification request (JSR 311 & JSR 339) which standardize development and deployment of RESTful web services using Java and JEE technologies. It provides API in Java Programming language to create web services according to the REST (Representational State Transfer) architectural pattern. Both Restlet and Jersey are two of the most popular implementation of JAX-RS used for developing RESTful web services in Java ecosystem but there are a couple of other implementation also exist e.g. Apache Wink, Apache CXF, and JBoss RESTEasy. In this article, I'll introduce with these RESTful web services framework in Java world. It's not a very detailed post about strength and weakness of each of the framework but will just give you enough to understand them in detail later. Read more �

Java Interviews are a little bit different than traditional programming interviews on tech giants and product based companies like Google, Amazon, Microsoft, or Facebook. First, even though it has questions from Data Structure and Algorithms e.g. String or Array , you can still manage to clear Java interviews if you are not an expert on them. The questions are a little bit easier and more practical than those companies. Another very important thing about Java interviews are questions based upon Java programming language and JDK API. Since Java is also an Object oriented programming language, you will find lots of OOP questions there. Since Java is primarily used as application programming language, the focus is aligned accordingly with questions mostly focusing on API, Java concepts, and design patterns . Read more �

If you remember REST WebServices uses HTTP methods to map CRUD (create, retrieve, update, delete) operations to HTTP requests. Even though both PUT and POST methods can be used to perform create and update operation in REST WebServices, Idempotency is the main difference between PUT and POST. Similar to the GET request , PUT request is also idempotent in HTTP, which means it will produce the same results if executed once more multiple times. Another practical difference PUT and POST method in the context of REST WebService are that POST is often used to create a new entity , and PUT is often used to update an existing entity. If you replace an existing entity using PUT than you should be aware that if only a subset of data elements is passed then the rest will be replaced by empty or null. Read more �