ExceptionMapper is a contract for a provider that maps Java exceptions to Response object. An implementation of ExceptionMapper interface must be annotated with @Provider to work correctly.

By default, a single instance of each provider class is instantiated for each JAX-RS application, aka singletons. When an exception of type ExceptionA thrown by a JAX-RS resource, this exception mapper can catch the exception and transform it into a HTTP 400 response, with the origin exception message as entity.

Overview. Apache CXF™ is an open source services framework. CXF helps you build and develop services using frontend programming APIs, like JAX-WS and JAX-RS. These services can speak a variety of protocols such as SOAP, XML/HTTP, RESTful HTTP, or CORBA and work over a variety of transports such as HTTP, JMS or JBI.

The Bus is the backbone of the CXF architecture. It manages extensions and acts as an interceptor provider. The interceptors for the bus will be added to the respective inbound and outbound message and fault interceptor chains for all client and server endpoints created on the bus (in its context).

public class WebApplicationException extends RuntimeException. Runtime exception for applications. This exception may be thrown by a resource method, provider or StreamingOutput implementation if a specific HTTP error response needs to be produced. Only effective if thrown prior to the response being committed.

RESTEasy is a JBoss / Red Hat project that provides various frameworks to help you build RESTful Web Services and RESTful Java applications. It is an implementation of the Jakarta RESTful Web Services, an Eclipse Foundation specification that provides a Java API for RESTful Web Services over the HTTP protocol.

Apache CXF is the product of two projects, Celtix and XFire , hence the name CXF . Celtix , an open source Java-based Enterprise Service Bus (ESB) project, is a product of ObjectWeb consortia that delivers open source middleware solutions. The project was sponsored by IONA .

In Apache Camel, the Camel CXF component is the key to integrating routes with Web services. You can use the Camel CXF component to create a CXF endpoint, which can be used in either of the following ways: Consumer — (at the start of a route) represents a Web service instance, which integrates with the route.

Running the HelloWorld Service This will generate the appropriate Apache CXF classes from your wsdl, compile your Apache CXF classes, deploy the server on the embedded jetty server and run your application. INFO: Setting the server’s publish address to be http://localhost:9090/HelloServerPort Server ready…

public class ApplicationException extends Exception. This class is used for reporting application level exceptions between ORBs and stubs.

Define a class that extends the RuntimeException class. You can define the @ExceptionHandler method to handle the exceptions as shown. This method should be used for writing the Controller Advice class file. Now, use the code given below to throw the exception from the API.

Both Jersey and RESTEasy provide their own implementation. The difference is that Jersey additionally provides something called Chunked Output. It allows the server to send back to the client a response in parts (chunks).