错误400错误的请求

Question

I have some problem with making a good request.

@Path("/activitiesGenerator")
public class ActivityResource {

ActivityStub acstub = new ActivityStub();

@GET
@Produces({MediaType.APPLICATION_XML, MediaType.APPLICATION_JSON})
public Collection<Activity> getAllActivities(){

    return acstub.Find_All_Activities();
}


@GET
@Produces({MediaType.APPLICATION_XML, MediaType.APPLICATION_JSON})
@Path("{activityId}") // Will act as parameter that will take value from the browser!
public Response getActivity(@PathParam("activityId") String activityId){

    if(activityId.equals(null) || activityId.length() < 4){

        return Response.status(Status.BAD_REQUEST).build();
    }

    Activity activity  = acstub.FindActivity(activityId);

    if(activity.equals(null)){

        return Response.status(Status.NOT_FOUND).build();
    }

    return Response.ok().entity(activity).build();
}

From here I pass the value!

@Test
public void main() {

    ActivityClient client = new ActivityClient();

    Activity activity = client.get("3204987");

    System.out.println(activity);

    assertNotNull(activity);
}

Here I make the check of response..

public Activity get(String id){

    WebTarget target = client.target("http://localhost:8080/Activities/rest/");
    Response response = target.path("activitiesGenerator/"+id).request(MediaType.APPLICATION_JSON).get(Response.class);

    System.out.println(response.getStatus());

    if(response.getStatus() != 200){

        throw new RuntimeException(response.getStatus()+ ": there was an error on the server");
    }

    return response.readEntity(Activity.class);

}

I got an exception from get method. The response is 400 Bad request. What did I make wrong?

Here is mine web.xml file!

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns="http://xmlns.jcp.org/xml/ns/javaee"
    xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
    id="WebApp_ID" version="3.1">

    <display-name>Activities</display-name>
    <servlet>
        <servlet-name>ActiviteExample</servlet-name>
        <servlet-class>org.glassfish.jersey.servlet.ServletContainer</servlet-class>
        <init-param>
            <param-name>jersey.config.server.provider.packages</param-name>
            <param-value>activity.model</param-value>
        </init-param>
    </servlet>
    <servlet-mapping>
        <servlet-name>ActiviteExample</servlet-name>
        <url-pattern>/rest/*</url-pattern>
    </servlet-mapping>
</web-app>

 Could not get any response
 This seems to be like an error connecting to      http://HTTP://localhost:8080/Activities/rest/activities-generator/3204987.
 Why this might have happened:
 The server couldn't send a response:
 Ensure that the backend is working properly
 SSL connections are being blocked:
 Fix this by importing SSL certificates in Chrome
 Cookies not being sent:

Here is what I got from mine postman. I will appreciate if anybody can explain me more specific about this possible solutions...

Answer 1

Add the Accepts header to the client code. The Accepts header will tell the server that the client making the request is willing to take the particular Mime type. If you are expecting json, specify application/json.

request(MediaType.APPLICATION_JSON) will only tell that the data sent to the server is json. It does not tell what you are willing to accept.

Make the requests in browser and use some browser addons to set the headers and watch the responses.

Read more about the Accept header here