Wildfly swarm - Page not found error - maven

Question

This is the pom.xml file that I have
<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>hu.javacity.app.buildingsofcities</groupId>
<artifactId>city</artifactId>
<name>WildFly Swarm Example</name>
<version>1.0.0-SNAPSHOT</version>
<packaging>war</packaging>
<properties>
<version.wildfly.swarm>2018.4.1</version.wildfly.swarm>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
<failOnMissingWebXml>false</failOnMissingWebXml>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.wildfly.swarm</groupId>
<artifactId>bom-all</artifactId>
<version>${version.wildfly.swarm}</version>
<scope>import</scope>
<type>pom</type>
</dependency>
</dependencies>
</dependencyManagement>
<build>
<finalName>demo</finalName>
<plugins>
<plugin>
<groupId>org.wildfly.swarm</groupId>
<artifactId>wildfly-swarm-plugin</artifactId>
<version>${version.wildfly.swarm}</version>
<executions>
<execution>
<goals>
<goal>package</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
<dependencies>
<!-- Java EE 7 dependency -->
<dependency>
<groupId>javax</groupId>
<artifactId>javaee-api</artifactId>
<version>7.0</version>
<scope>provided</scope>
</dependency>
<!-- WildFly Swarm Fractions -->
</dependencies>
</project>
And this would be HelloWorldEndpoint.java
package hu.javacity.app.buildingsofcities.city.rest;
import javax.ws.rs.Path;
import javax.ws.rs.core.Response;
import javax.ws.rs.GET;
import javax.ws.rs.Produces;
#Path("/hello")
public class HelloWorldEndpoint {
#GET
#Produces("text/plain")
public Response doGet() {
return Response.ok("Hello from WildFly Swarm!").build();
}
}
After running Maven, It says: "WildFly Swarm is ready" and I get no errors So im trying to write the following URL in: localhost:8080/hello The result is the following message: "not found" I tried using Edge, Firefox or Chrome, but to no success.

Answer 1

So there are a few problems here. First, you are missing the JAX-RS Swarm Fraction. This means that the dependencies in your pom.xml need to look like:
<dependencies>
<!-- Java EE 7 dependency -->
<dependency>
<groupId>javax</groupId>
<artifactId>javaee-api</artifactId>
<version>7.0</version>
<scope>provided</scope>
</dependency>
<!-- WildFly Swarm Fractions -->
<dependency>
<groupId>org.wildfly.swarm</groupId>
<artifactId>jaxrs</artifactId>
</dependency>
</dependencies>
Now the second problem. In the 2018.4.1 version of Wildfly Swarm the swarm team removed the automatic generation of the javax.ws.rs.core.Application that is required for standard JAX-RS applications (see this blog for more information). If you try to start your code in 2018.4.1 you'll get a warning:
WFLYRS0015: No Servlet declaration found for JAX-RS application. In
demo.war either provide a class that extends
javax.ws.rs.core.Application or declare a servlet class in web.xml.
And your application doesn't work. So you have two choices to fix that issue. The first is to just use 2018.3.1 as it does do the auto generation. However, that's a poor fix as, going forward, Swarm will likely continue the behavior of the 2018.4.1 release. So to fix it you need to add your own javax.ws.rs.core.Application that could look something like:
package hu.javacity.app.buildingsofcities.city.rest;
import javax.ws.rs.ApplicationPath;
import javax.ws.rs.core.Application;
#ApplicationPath("/")
public class RestApplication extends Application {
// intentionally empty
}
This sets up your JAX-RS path to be /. A common pattern is to use something like /rest or /svc but for now this will work fine for you.