java ee service formparam optional

In Java Enterprise Edition (Java EE), the @FormParam annotation is used to bind a form parameter to a method parameter in a javax.ws.rs.Consumes annotated resource class.

If you want to make the form parameter optional, you can use the required attribute of the @FormParam annotation and set it to false. This will allow the method to be called even if the form parameter is not present in the request.

Here's an example of how to use the @FormParam annotation with the required attribute set to false:

import javax.ws.rs.*;

@Path("/form")
public class FormResource {
    @POST
    @Consumes(MediaType.APPLICATION_FORM_URLENCODED)
    public void submitForm(@FormParam(value = "param1", required = false) String param1,
                           @FormParam("param2") String param2) {
        // Process the form parameters
    }
}

In this example, the submitForm() method is annotated with @Consumes(MediaType.APPLICATION_FORM_URLENCODED) to indicate that it consumes form-encoded data. The param1 and param2 parameters are annotated with the @FormParam annotation to bind them to form parameters with the same name.

The param1 parameter is marked as optional using the required attribute, while the param2 parameter is required. This means that the submitForm() method can be called even if the param1 form parameter is not present in the request, but it must have a param2 form parameter.