Why can't find the servlet?

Question

Java

The first example I get 404 does not find, how do I change it to this code (1.bottom) + web.xml ..

There is a call to: localhost:8080/Testing/register/get when loading the server .. I

use IDEA - I give an example settings:




mine web.xml:

<servlet>
        <servlet-name>register</servlet-name>
        <servlet-class>org.glassfish.jersey.servlet.ServletContainer</servlet-class>

    <init-param>
        <param-name>jersey.config.server.provider.packages</param-name>
        <param-value>demo.JerseyDemo</param-value>
    </init-param>

    </servlet>

    <servlet-mapping>
        <servlet-name>register</servlet-name>
        <url-pattern>/register/*</url-pattern>
    </servlet-mapping>

one.

@Path("/register")
public class JerseyDemo {


    @GET
    @Path("/get")
   public String getValue(@QueryParam("value") String value){

        System.out.println("The Value is: "+value); // will have output null ! 

       return value;
   }
}

The second example works, I don't create web.xml There is a call to: localhost:8080/Testing/register
2.

@WebServlet(urlPatterns = "/register")
public class JerseyDemo extends HttpServlet{

     @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
       // code working
    }
}

Tomcat localhost log:

at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
  at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616)
  at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
  at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:528)
  at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1100)
  at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:687)
  at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1520)
  at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1476)
  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
  at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
  at java.lang.Thread.run(Thread.java:745)

Changed to: when starting the server access to the URL: localhost:8080/Testing/jersey/register/get

public class ApplTest {

    public static void main(String[] args) {

       Client client = ClientBuilder.newClient();

        Response request = client.target("http://localhost:8080/Testing/jersey/register/get").request().get();

        System.out.println(request);
    }
}

InboundJaxrsResponse{context=ClientResponse{method=GET, uri= localhost:8080/Testing/jersey/register/get , status=404, reason=Not Found}}

@Path("/register")
 public class JerseyDemo {
    @Context
    HttpServletResponse httpServletResponse;

    @GET
    @Path("/get")
   public void testServlet() throws IOException {
        httpServletResponse.getWriter().print("Hello");
        System.out.println("Hello!");
    }
}

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
         version="3.1">
    <servlet>
        <servlet-name>register</servlet-name>
        <servlet-class>org.glassfish.jersey.servlet.ServletContainer</servlet-class>
    <init-param>
        <param-name>jersey.config.server.provider.packages</param-name>
        <param-value>demo</param-value>
    </init-param>
    </servlet>
    <servlet-mapping>
        <servlet-name>register</servlet-name>
        <url-pattern>/jersey/*</url-pattern>
    </servlet-mapping>
</web-app>

Answer 1

1) Be defined, or mapping on web.xml or annotations in servlets.
It is impossible to bind one servlet to one address from annotations and web.xml at the same time, which he cursed about.
2) Annotations Path("/register") and Path("/get")
say about the url: @[email protected]/register/get
how magically Tomcat should decide about jersey appearance?
3) web.xml with jersey describes url: /jersey/get, not /jersey/register/get