Thursday, October 8, 2015

Jersey2 Request Filters

What and Why?

Jersey filter is an interceptor class (mediator) we use to filter the requests before hitting out the end point.
(Caller)  --> Filter  --> (End point)

We can check the Authorization functionality here.
Lets assume we have an end point which returns user permission details.
So if we need to filter only the requests come through a particular client, we can add a filter and allow only the valid requests.



public class AuthorizationFilter implements ContainerRequestFilter { 
    @Override public void filter(ContainerRequestContext request) throws IOException {
            if (!isAuthorized()) {
               // Throw Exception here

    private Boolean isAuthorized() {
        boolean isAuthorized = true;

        //implement the logic here.
        return isAuthorized;

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