Hello world of RESTful based on Jersey and Jetty - rest

Question

I'm following this guide to build my hello world web service and get kind of stuck, here are my codes:
MyResource.java:
package com.example;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
#Path("myresource")
public class MyResource {
#GET
#Produces("text/plain")
public String getIt() {
return "Got it!";
}
}
pom.xml:
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>ts</groupId>
<artifactId>mtest</artifactId>
<packaging>war</packaging>
<version>1.0-SNAPSHOT</version>
<name>mtest Maven Webapp</name>
<url>http://maven.apache.org</url>
<dependencies>
<dependency>
<groupId>org.glassfish.jersey.containers</groupId>
<artifactId>jersey-container-jetty-http</artifactId>
<version>2.19</version>
</dependency>
<dependency>
<groupId>org.glassfish.jersey.containers</groupId>
<artifactId>jersey-container-jetty-servlet</artifactId>
<version>2.19</version>
</dependency>
</dependencies>
<build>
<finalName>mtest</finalName>
<plugins>
<plugin>
<groupId>org.eclipse.jetty</groupId>
<artifactId>jetty-maven-plugin</artifactId>
<version>9.3.0.M1</version>
</plugin>
</plugins>
</build>
web.xml:
<web-app version="3.0"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<!-- Servlet declaration can be omitted in which case
it would be automatically added by Jersey -->
<servlet>
<servlet-name>javax.ws.rs.core.Application</servlet-name>
</servlet>
<servlet-mapping>
<servlet-name>javax.ws.rs.core.Application</servlet-name>
<url-pattern>/myresource/*</url-pattern>
</servlet-mapping>
Now my problems are:
After launching Jetty, I can get a hello world of my jsp from http://localhost:8080/, but http://localhost:8080/myresource returns 404
Intellij complains Element web-app must be declared

Answer 1

Add your servlet declaration in the web.xml like this
<servlet>
<servlet-name>javax.ws.rs.core.Application</servlet-name>
<servlet-class>org.glassfish.jersey.servlet.ServletContainer</servlet-class>
<init-param>
<param-name>jersey.config.server.provider.packages</param-name>
<param-value>com.example</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
that should work. And sometimes the path needs a bar like this.
#Path("/myresource")
And see that, if you put
<url-pattern>/myresource/*</url-pattern>
you have to hit
http://localhost:8080/myresource/myresource
one by your web configuration, and another by the path of your resource.
but, if you are trying this in tomcat, you need to include the artifactId too, like this:
http://localhost:8080/mtest/myresource/myresource
I hope that this help you.