You can designate ContainerRequestFilters as the prematching filter by annotating with the @javax.ws.rs.container.PreMatching annotation. The prematching filters are applied before the JAX-RS runtime identifies the matching Java class resource method. As this filter is executed before executing the resource matching process, you can use this type of filter to modify the HTTP request contents. Apparently, this can be used for influencing the request matching process, if required.

The following code snippet illustrates how you can use a prematching filter to modify the method type in the incoming HTTP request. This example modifies the method type from POST to PUT. As this is executed before identifying the Java resource method, the change in method type will influence the identification of the Java class resource method for executing the call:

import java.io.IOException; 
import javax.ws.rs.container.ContainerRequestContext; 
import javax.ws.rs.container.ContainerRequestFilter; 
import javax.ws.rs.ext.Provider; 
import javax.ws.rs.container.PreMatching; 
 
@Provider 
@PreMatching 
public class JAXRSContainerPrematchingRequestFilter implements 
     ContainerRequestFilter  { 
    @Override 
    public void filter(ContainerRequestContext requestContext)  
        throws IOException { 
         //Modify the method type from POST to PUT 
        if (requestContext.getMethod().equals("POST")) { 
            requestContext.setMethod("PUT"); 
        } 
    } 
}