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RuntimeException could not be mapped to a response, re-throwing to the HTTP container java.lang.NullPointerException

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I am trying to validate a user record from my database using Spring Framework, RESTful Web Services and Jersey Implementation.
I am using MySQL v5.6.0, Eclipse Galileo, Apache tomcat v6.0
UserAccessWS.java
@Path("/user")
@Service
public class UserAccessWS {
@Autowired
private IUserService userService;
private static Logger LOGGER = Logger.getLogger(UserAccessWS.class);
@POST
@Path("/validateUser")
@Produces({ MediaType.APPLICATION_JSON })
public String getValidateUser(@Context HttpServletRequest request,
        @FormParam("userName") String userName,
        @FormParam("password") String password) throws JSONException {
    LOGGER.info("getValidateUser method");
    Users users = new Users();
    users.setUserName(userName);
    users.setPassword(password);
    List<Users> userList = new ArrayList<Users>();
    userList = userService.validateUser(users);
    JSONObject userInfo = new JSONObject();
    userInfo.put("authorize", true);
    return userInfo.toString();
@POST
@Path("/login")
@Produces({ MediaType.APPLICATION_JSON })
public String userLogin(
        @FormParam("userName") String userName,
        @FormParam("password") String password) 
                throws Exception 
    LOGGER.info("in UserAccessWS::userLogin()");
    JSONObject json = new JSONObject();
    JSONArray jsonArr = new JSONArray();
    List<Users> userList = new ArrayList<Users>();
    userList = userService.userLogin(userName, password);
Null error is being pointed out in this line 
"userList = userService.userLogin(userName, password);"
    //System.out.println(userList);
    if (userList.size() == 0)
        json.put("status", "fail");
        json.put("status", "success");
        jsonArr.add(userList.get(0));
        json.put("data", jsonArr);
     //System.out.println(jsonArr.get(0).userId);
    return json.toString();
IUserService.java
package com.cisco.service.view;
import java.util.List;
import org.json.JSONObject;
import com.cisco.connectivity.rs.mapper.ForgotPassword;
import com.cisco.connectivity.rs.mapper.PasswordChange;
import com.cisco.connectivity.rs.mapper.Registration;
import com.cisco.model.xml.domain.Email;
import com.cisco.model.xml.domain.Users;
public interface IUserService {
public List<Users> validateUser(Users users);
public List<Users> userLogin(String userName, String password);
public String userChangePassword(PasswordChange change);
public List<Email> userForgotPassword(ForgotPassword forgot);
public JSONObject saveData( Registration registration);
public JSONObject check(String userName);
public JSONObject editData( Registration registration);
public JSONObject deleteData( Registration registration);
public JSONObject getData( Registration registration);
public JSONObject getRegistrationFormData(String userName);
applicationContext.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:aop="http://www.springframework.org/schema/aop" xmlns:jee="http://www.springframework.org/schema/jee"
xsi:schemaLocation="http://www.springframework.org/schema/beans 
    http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
    http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd
    http://www.springframework.org/schema/aop http://www.springframework.org/schema/tx/spring-aop-2.5.xsd
    http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd
    http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-2.0.xsd"
default-autowire="byName">
<bean id="applicationProperties"
    class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
    <property name="ignoreResourceNotFound" value="true" />
    <property name="ignoreUnresolvablePlaceholders" value="true" />
    <property name="searchSystemEnvironment" value="true" />
</bean>
<context:component-scan base-package="com.cisco" />
<bean id="dataSource"
    class="org.springframework.jdbc.datasource.DriverManagerDataSource">
    <property name="driverClassName" value="com.mysql.jdbc.Driver" />
    <property name="url" value="jdbc:mysql://localhost:3306/pooler_mgmt" />
    <property name="username" value="root" />
    <property name="password" value="" />
</bean>
<bean id="systemProperties" class="java.util.HashMap"></bean>
<bean id="systemEnvironment" class="java.util.HashMap"></bean>
<?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" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
id="WebApp_ID" version="2.5">
<display-name>CiscoPoolerMgmt</display-name>
<description>CiscoPoolerMgmt</description>
<context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath*:/CiscoPoolerMgmt/config/applicationContext.xml</param-value>
</context-param>
<context-param>
    <param-name>log4jConfigLocation</param-name>
    <param-value>classpath*:/CiscoPoolerMgmt/config/log4j.xml</param-value>
</context-param>
<listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<!-- REST web service -->
<servlet>
    <servlet-name>REST_stat_web_service</servlet-name>
    <servlet-class>com.sun.jersey.spi.spring.container.servlet.SpringServlet</servlet-class>
    <init-param>
        <param-name>com.sun.jersey.config.property.resourceConfigClass</param-name>
        <param-value>com.sun.jersey.api.core.PackagesResourceConfig</param-value>
    </init-param>
    <init-param>
        <param-name>com.sun.jersey.config.property.packages</param-name>
        <param-value>com.cisco.ws</param-value>
    </init-param>
    <init-param>
        <param-name>com.sun.jersey.api.json.POJOMappingFeature</param-name>
        <param-value>true</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
    <servlet-name>REST_stat_web_service</servlet-name>
    <url-pattern>/cisco_BI/rest/*</url-pattern>
</servlet-mapping>
<welcome-file-list>
    <welcome-file>index.html</welcome-file>
</welcome-file-list>
Error which I am get is:
SEVERE: The RuntimeException could not be mapped to a response, re-throwing to the HTTP container
java.lang.NullPointerException
at com.cisco.ws.UserAccessWS.userLogin(UserAccessWS.java:69)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$TypeOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:149)
at com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:67)
at com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:259)
at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:133)
at com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:83)
at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:133)
at com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:71)
at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:990)
at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:941)
at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:932)
at com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:384)
at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:451)
at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:632)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:602)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Unknown Source)
Aug 21, 2013 12:54:21 AM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet REST_stat_web_service threw exception
java.lang.NullPointerException
at com.cisco.ws.UserAccessWS.userLogin(UserAccessWS.java:69)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$TypeOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:149)
at com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:67)
at com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:259)
at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:133)
at com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:83)
at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:133)
at com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:71)
at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:990)
at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:941)
at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:932)
at com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:384)
at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:451)
at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:632)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:602)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Unknown Source)
The database from where it has to validate the details entered by user is NOT empty. It has the records in them. But via this query it always gives a NullPointerException.
Please help me out.
                Sorry, earlier i had not pasted the relevant code. Now i have updated it.Thanks for pin pointing it. I'm new here.
– user2639869
                Aug 20, 2013 at 19:51
                stackoverflow.com/questions/12555707/jax-ws-webservice-does-not-take-spring-bean-from-applicationcontext-hence-throw
– Boris Treukhov
                Aug 20, 2013 at 20:32
                @soulcheck : I havent uploaded the code for IUserService here. As there isnt any error pointing to it.
– user2639869
                Aug 20, 2013 at 20:43
                @BorisTreukhov : I tried out the first answer by editing my file with this line "Service class should extends SpringBeanAutowiringSupport". " But still no success.
– user2639869
                Aug 20, 2013 at 20:49
May be this is a late reply. I am suspecting the userService it self is null. It is not autowired properly. Because here you mentioned default-autowire="byName" in your applicationContext.xml. I couldn't find the bean named userService in your applicationContext.xml. I think you need to add the below line in you applicationContext.xml
 <bean id="userService" class="yourIUserServiceImplClass"></bean>
        Thanks for contributing an answer to Stack Overflow!
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