Can't Generate swagger.json With CXFNonSpringJaxrsServlet

[jeffdavis]

I am attempting to integrate swagger with a legacy REST service implemented
using an older version of CXF.  I've attempted several configurations but
can't get the swagger.json to generate.  Guidance on getting this resolved
is greatly appreciated.  Please see project code below:

*HelloService.java*

package swaggerRest;

import javax.ws.rs.*;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;

@Path("/sample")
@Api(value = "/sample", description = "Sample REST for Swagger Testing")
public class HelloService {
 @GET
 @Path("hello")
 @ApiOperation(value = "Get hello message", response = String.class)
 public String sayHello(){
 return "Hello World";
 }
}

*web.xml*

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
xmlns="http://java.sun.com/xml/ns/javaee";
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"; id="WebApp_ID"
version="3.0">

  <display-name>swaggerRest</display-name>
  
  <context-param>
    <param-name>contextParam</param-name>
    <param-value>contextParamValue</param-value>
  </context-param>
  
  <servlet>
    <servlet-name>CXFServlet</servlet-name>
   
<servlet-class>org.apache.cxf.jaxrs.servlet.CXFNonSpringJaxrsServlet</servlet-class>
    <init-param>
      <param-name>jaxrs.serviceClasses</param-name>
      <param-value>swaggerRest.HelloService</param-value>
    </init-param>
    <init-param>
      <param-name>jaxrs.features</param-name>
      <param-value>org.apache.cxf.jaxrs.swagger.Swagger2Feature
(basePath=/rest)</param-value>
    </init-param>
  </servlet>

  <servlet-mapping>
    <servlet-name>CXFServlet</servlet-name>
    <url-pattern>/rest/*</url-pattern>
  </servlet-mapping>
</web-app>

*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/xsd/maven-4.0.0.xsd";>
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.test</groupId>
  <artifactId>swaggerRest</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>war</packaging>
  
  <dependencies>
    
    <dependency>
         <groupId>org.apache.cxf</groupId>
      <artifactId>cxf-rt-frontend-jaxrs</artifactId>
      <version>2.7.14</version>
    </dependency>
    <dependency>
      <groupId>org.apache.cxf</groupId>
      <artifactId>cxf-rt-transports-http</artifactId>
      <version>2.7.14</version>
    </dependency>
    <dependency>
      <groupId>org.apache.cxf</groupId>
      <artifactId>cxf-rt-rs-extension-providers</artifactId>
      <version>2.7.14</version>
    </dependency>
    <dependency>
      <groupId>org.apache.cxf</groupId>
      <artifactId>cxf-rt-rs-service-description</artifactId>
      <version>3.1.7</version>
    </dependency>
    <dependency>
      <groupId>org.codehaus.jackson</groupId>
      <artifactId>jackson-jaxrs</artifactId>
      <version>1.1.1</version>
    </dependency>  
  
    
    <dependency>
        <groupId>io.swagger</groupId>
        <artifactId>swagger-jaxrs</artifactId>
        <version>1.5.8</version>
    </dependency>
    <dependency>
      <groupId>io.swagger</groupId>
      <artifactId>swagger-annotations</artifactId>
      <version>1.5.9</version>
    </dependency>
    <dependency>
        <groupId>org.webjars</groupId>
        <artifactId>swagger-ui</artifactId>
        <version>2.1.4</version>
    </dependency>
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-api</artifactId>
        <version>1.7.21</version>
    </dependency>
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-simple</artifactId>
        <version>1.7.21</version>
    </dependency> 
    <dependency>
      <groupId>org.apache.cxf</groupId>
      <artifactId>cxf-rt-rs-service-description-swagger</artifactId>
      <version>3.1.7</version>
    </dependency> 
  </dependencies>
 
  <build>
    <sourceDirectory>src</sourceDirectory>
    <plugins>
      <plugin>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.5.1</version>
        <configuration>
          <source>1.8</source>
          <target>1.8</target>
        </configuration>
      </plugin>
      <plugin>
        <artifactId>maven-war-plugin</artifactId>
        <version>2.6</version>
        <configuration>
          <warSourceDirectory>WebContent</warSourceDirectory>
          <failOnMissingWebXml>false</failOnMissingWebXml>
        </configuration>
      </plugin>
    </plugins>
  </build>
</project>



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