WebSphere Application Server & Liberty

Hi all

I have a JAX-RS application running on Websphere Application Server 9.0.5 (Java 1.8). I would like to make use of spring for the backing business classes and hence was attempting to inject Spring (Core – version 5.3.27) beans into the JAX-RS application

I understand that theIBM JAX-RS  implementation relies on the com.ibm.websphere.jaxrs.server.IBMRestServlet for its initialization. Following post at http://www.javavillage.in/spring-ioc-on-servlets.php ,  I tried  creating a custom servlet extending the IBMRestServlet and adding Spring autowiring to its init method

package org.my.example;




import org.springframework.beans.factory.annotation.Configurable;
import org.springframework.web.context.support.SpringBeanAutowiringSupport;

import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import com.ibm.websphere.jaxrs.server.IBMRestServlet;
@Configurable
public class MyHttpServlet extends IBMRestServlet {

    @Override
    public void init(ServletConfig config) throws ServletException {

        super.init(config);
        SpringBeanAutowiringSupport.processInjectionBasedOnCurrentContext(this);

    }

}

This required, the IBM Websphere jars ( From "Websphere installation folder/Dev")  to be added to my POM along with spring-web, aspectjweaver, spring-aspects , spring-context-support, spring-context etc as mentioned in link

<dependency>
                <groupId>com.ibm.websphere</groupId>
                <artifactId>j2ee</artifactId>
                <version>1.0.0</version>
                <scope>system</scope>
                <systemPath>C:/IBM/WebSphere/AppServer/dev/JavaEE/j2ee.jar</systemPath>
</dependency>


<dependency>
                <groupId>com.ibm.websphere.appserver.api</groupId>
                <artifactId>com.ibm.websphere.appserver.api.jaxrs</artifactId>
                <version>1.0.80</version>
</dependency>
<dependency>
                <groupId>org.apache.wink</groupId>
                <artifactId>wink-server</artifactId>
                <version>1.4</version>
</dependency>
<dependency>
                <groupId>com.ibm.websphere.appserver</groupId>
                <artifactId>was_public</artifactId>
                <version>9.0.0</version>
</dependency>

Following was added to web.xml

<listener>
                <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<context-param>
                <param-name>contextConfigLocation</param-name>
                <param-value>/WEB-INF/applicationContext.xml</param-value>
</context-param>



<servlet>
       <servlet-name>JAXRSConfiguration</servlet-name>
       <servlet-class> org.my.example.MyHttpServlet </servlet-class>
       <init-param>
           <param-name>javax.ws.rs.Application</param-name>
           <param-value> org.my.example.RestConfig </param-value>
       </init-param>
       <load-on-startup>1</load-on-startup>

Note: org.my.example.RestConfig is my class that extends javax.ws.rs.core.Application

Unfortunately the build fails with following error which I am unable to resolve with any dependencies

java: cannot access com.ibm.ws.ras.instrument.annotation.InjectedFFDC

  class file for com.ibm.ws.ras.instrument.annotation.InjectedFFDC not found

As an alternate approach, I tried injecting spring to Rest Resource

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.stereotype.Component;

@Component

@Path("/mypath")

public class MyResource {
  
                @Autowired
                TestClass testClass;

private static final Logger LOGGER = LoggerFactory.getLogger(MyResource.class);

                @POST

                @Path("/subpath")

                @Consumes(MediaType.APPLICATION_JSON)

                @Produces(MediaType.APPLICATION_JSON)

                public Response getMyResourceList(MyRequest request) {

                                ApplicationContext applicationContext = new ClassPathXmlApplicationContext("applicationContext.xml");

                                TestClass tClass = applicationContext.getBean(TestClass.class);

                                if(tClass!=null){

                                                LOGGER.debug("TestClass not null");

                                }

                                LOGGER.debug("tClass-------->-"+tClass.testMethod());

                                LOGGER.debug("testClass------>"+testClass.testMethod());

                }

The Web.xml was modified as below

<listener>
                <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<context-param>
                <param-name>contextConfigLocation</param-name>
                <param-value>/WEB-INF/applicationContext.xml</param-value>
</context-param>

<listener>
                <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<context-param>
                <param-name>contextConfigLocation</param-name>
                <param-value>/WEB-INF/applicationContext.xml</param-value>
</context-param>

With servlet still pointing to IBMRestServlet as in original JAX-RS application

<servlet>
       <servlet-name>JAXRSConfiguration</servlet-name>
       <servlet-class>com.ibm.websphere.jaxrs.server.IBMRestServlet</servlet-class>
       <init-param>
           <param-name>javax.ws.rs.Application</param-name>
           <param-value> org.my.example.RestConfig</param-value>
       </init-param>
       <load-on-startup>1</load-on-startup>
   </servlet>

My Bean looks as follows

@Component
public class TestService {
    public String testMethod(){
        return "spring class";
    }
}

Here I am successfully able to get the bean instance but since the Application context is created per resource, I do not think it's a good way.

Request your help and suggestions

Thanks in Advance

------------------------------
Sibi Vaithara
------------------------------