How to get URL of REST endpoint?

393
July 29, 2017, at 2:16 PM

Can someone explain why this URL returns 404?

http://localhost:8080/HelloWorld-1.0-SNAPSHOT/rest/hat

How should I be passing this so the parameter hat is passed in and see Hello hat! on the output

HelloService.java

package com.sentiment360.helloworld;
public class HelloService {
    String createHelloMessage(String name) {
        return "Hello " + name + "!";
    }
}

HelloWorld.java

package com.sentiment360.helloworld;
/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
import javax.inject.Inject;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
/**
 * A simple REST service which is able to say hello to someone using HelloService Please take a look at the web.xml where JAX-RS
 * is enabled
 *
 * @author gbrey@redhat.com
 *
 */
@Path("/")
public class HelloWorld {
    @Inject
    HelloService helloService;
    @GET
    @Path("/json")
    @Produces({ "application/json" })
    public String getHelloWorldJSON() {
        return "{\"result\":\"" + helloService.createHelloMessage("World") + "\"}";
    }
    @GET
    @Path("/xml")
    @Produces({ "application/xml" })
    public String getHelloWorldXML() {
        return "<xml><result>" + helloService.createHelloMessage("World") + "</result></xml>";
    }
}

JAXActivator.java

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package com.sentiment360.helloworld;
import javax.ws.rs.ApplicationPath;
import javax.ws.rs.core.Application;
/**
 * JAXActivator is an arbitrary name, what is important is that javax.ws.rs.core.Application is extended
 * and the @ApplicationPath annotation is used with a "rest" path.  Without this the rest routes linked to
 * from index.html would not be found.
 */
@ApplicationPath("rest")
public class JAXActivator extends Application {
    // Left empty intentionally
}

web.xml

<?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">
    <session-config>
        <session-timeout>
            30
        </session-timeout>
    </session-config>
</web-app>

My directory structure:

Answer 1

You should change your endpoints like this:

@GET
@Path("/rest/{name}")
@Consumes("application/json")
@Produces("application/json")
public String getHelloWorldJSON(@PathParam("name") String name) {
    return "{\"result\":\"" + helloService.createHelloMessage(name) + "\"}";
}
@GET
@Path("/rest/{name}")
@Consumes("application/xml")
@Produces("application/xml")
public String getHelloWorldJSON(@PathParam("name") String name) {
    return "<xml><result>" + helloService.createHelloMessage(name) + "</result></xml>";
}

The @Consumes is the right way to change from json and xml input. The @Path("rest/{name}") is doing the binding of this endpoint to /rest/something, and the @PathParam("name") is binding the variable path value to the variable name

This will work if your server is correctly deployed in http://localhost:8080/HelloWorld-1.0-SNAPSHOT

Answer 2

The url you are using does not match your configuration.

Given your configuration you have 2 possible resources to request:

  1. http://your_server/rest/json
  2. http://your_server/rest/xml

which basically differ in the produced contenttype.

Edit: Ok, i will post necessary changes so that you have exactly the output you asked for given the exact query you wanted to use:

public class HelloWorld {
    @Inject
    HelloService helloService;
    @GET
    @Path("/{helloSuffix}")
    public String getHello(@PathParam("helloSuffix") String helloSuffix) {
        return helloService.createHelloMessage(helloSuffix);
    }
}

JAXActivator.java ...

@ApplicationPath("HelloWorld-1.0-SNAPSHOT/rest")
public class JAXActivator extends Application {
}
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