RESTEasy + Spring 3 + Maven

Question

I'm having some issues trying to configure an app to use RESTEasy + Spring 3 + Maven. So far this is what I have:

Service interface:

package com.test.service;
public interface ProcessRequestService {
    String test();
}

Service Implementation:

package com.test.service;
import org.springframework.stereotype.Service;

@Service
public class ProcessRequestServiceImpl implements ProcessRequestService {
    @Override
    public String test() {
        return "Resteasy Test";
    }
}

Component:

package com.test.web;

@Component
@Path("/message")
public class Main {

    @Autowired
    private ProcessRequestService processRequestService;

    public void setService(ProcessRequestService processRequestService) {
        this.processRequestService = processRequestService;
    }

    @GET
    @Path("/example")
    public Response example() {
        String result = processRequestService.test();
        return Response.status(200).entity(result).build();
    }
}

My 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>com</groupId>
    <artifactId>test</artifactId>
    <packaging>war</packaging>
    <version>0.0.1-SNAPSHOT</version>
    <name>test</name>
    <url>http://maven.apache.org</url>

    <properties>
        <spring.version>3.2.8.RELEASE</spring.version>
        <resteasy.version>3.0.4.Final</resteasy.version>
    </properties>

    <repositories>
        <repository>
            <id>JBoss repository</id>
            <url>https://repository.jboss.org/nexus/content/groups/public-jboss/</url>
        </repository>
    </repositories>

    <dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.jboss.resteasy</groupId>
            <artifactId>resteasy-jaxrs</artifactId>
            <version>${resteasy.version}</version>
            <scope>provided</scope>
        </dependency>
    </dependencies>

    <build>
        <finalName>client</finalName>
    </build>

</project>

web.xml:

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

    <context-param>
        <param-name>resteasy.scan</param-name>
        <param-value>true</param-value>
    </context-param>

    <context-param>
        <param-name>resteasy.servlet.mapping.prefix</param-name>
        <param-value>/api</param-value>
    </context-param>

    <listener>
        <listener-class>org.jboss.resteasy.plugins.server.servlet.ResteasyBootstrap</listener-class>
    </listener>

    <servlet>
        <servlet-name>resteasy-servlet</servlet-name>
        <servlet-class>org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher</servlet-class>
    </servlet>

    <servlet-mapping>
        <servlet-name>resteasy-servlet</servlet-name>
        <url-pattern>/api/*</url-pattern>
    </servlet-mapping>

    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>/WEB-INF/mvc-dispatcher-servlet.xml</param-value>
    </context-param>

</web-app>

And finally mvc-dispatcher.servlet.xml

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans     
        http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
        http://www.springframework.org/schema/context 
        http://www.springframework.org/schema/context/spring-context-3.0.xsd">

    <context:component-scan base-package="com.test" />
    <context:annotation-config />

</beans>

What I'm trying to avoid is to declare many beans in an xml file by using the @Service annotation.

When I deploy this application to jboss 6.1 I get a NullPointerException. I guess it is because Spring is not able to Autowire the service to the Component but I'm not sure why this is happening.

I was able to achieve this by making some modifications to this tutorial but it is using Spring's RequestMapping instead of RESTEasy.

Any help will be appreciated.

You can use Apache CXF implementation of JAX-RS which supports Spring. There probably will not be any code changes. — Ostap Maliuvanchuk

Raphael Raphael · Accepted Answer · 2015-09-10T11:12:09

I had the same issue.please try this.

In POM file add the below dependency:

<dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>resteasy-spring</artifactId>
<version>3.0.4.Final</version>
</dependency>

And in mvc-dispatcher.servlet.xml add the bean definition above component-scan

<bean class="org.jboss.resteasy.plugins.spring.SpringBeanProcessorServletAware"/>

This will solve the null pointer exception.Hope this helps.

RESTEasy + Spring 3 + Maven

2 Answers