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POIntegrating both spring mvc and Jersey, getting a null pointer when viewing a jersey endpoint
 

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  1. POIntegrating both spring mvc and Jersey, getting a null pointer when viewing a jersey endpoint
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    <p>My simple jersey endpoint:</p> <pre><code>@Component @Path("/v1/user") public class UserService { @Autowired com.myapp.core.service.UserService userService; @GET @Path("/get") public Response getUser() { User user = userService.getUser(1); String result = user.getUsername(); return Response.status(200).entity(result).build(); } } </code></pre> <p>(BTW, since this is restful, will this be an xml or json output??)</p> <p>My spring mvc pages working fine (that hit hibernate), but when I visit localhost:8080/api/v1/user/get I see:</p> <pre><code>java.lang.NullPointerException com.myapp.api.UserService.getUser(UserService.java:30) sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) java.lang.reflect.Method.invoke(Method.java:597) com.sun.jersey.spi.container.JavaMethodInvokerFactory$1.invoke(JavaMethodInvokerFactory.java:60) com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$ResponseOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:205) com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:75) com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:288) com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147) com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:108) com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147) com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:84) com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1469) com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1400) com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1349) com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1339) com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:416) com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:537) com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:699) javax.servlet.http.HttpServlet.service(HttpServlet.java:717) </code></pre> <p>My web.xml:</p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;web-app version="2.5" 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_2_5.xsd"&gt; &lt;display-name&gt;myapp&lt;/display-name&gt; &lt;description&gt;myapp&lt;/description&gt; &lt;context-param&gt; &lt;param-name&gt;contextConfigLocation&lt;/param-name&gt; &lt;param-value&gt; /WEB-INF/spring/applicationContext.xml /WEB-INF/spring/myapp-servlet.xml &lt;/param-value&gt; &lt;/context-param&gt; &lt;servlet&gt; &lt;servlet-name&gt;myapp&lt;/servlet-name&gt; &lt;servlet-class&gt;org.springframework.web.servlet.DispatcherServlet&lt;/servlet-class&gt; &lt;init-param&gt; &lt;param-name&gt;contextConfigLocation&lt;/param-name&gt; &lt;param-value&gt;/WEB-INF/spring/myapp-servlet.xml&lt;/param-value&gt; &lt;/init-param&gt; &lt;load-on-startup&gt;1&lt;/load-on-startup&gt; &lt;/servlet&gt; &lt;servlet-mapping&gt; &lt;servlet-name&gt;myapp&lt;/servlet-name&gt; &lt;url-pattern&gt;/&lt;/url-pattern&gt; &lt;/servlet-mapping&gt; &lt;!-- jersey --&gt; &lt;listener&gt; &lt;listener-class&gt; org.springframework.web.context.ContextLoaderListener &lt;/listener-class&gt; &lt;/listener&gt; &lt;!--&lt;listener&gt;--&gt; &lt;!--&lt;listener-class&gt;org.springframework.web.context.request.RequestContextListener&lt;/listener-class&gt;--&gt; &lt;!--&lt;/listener&gt;--&gt; &lt;servlet&gt; &lt;servlet-name&gt;jersey-servlet&lt;/servlet-name&gt; &lt;servlet-class&gt; com.sun.jersey.spi.spring.container.servlet.SpringServlet &lt;/servlet-class&gt; &lt;init-param&gt; &lt;param-name&gt;com.sun.jersey.config.property.packages&lt;/param-name&gt; &lt;param-value&gt;com.myapp.api&lt;/param-value&gt; &lt;/init-param&gt; &lt;load-on-startup&gt;2&lt;/load-on-startup&gt; &lt;/servlet&gt; &lt;servlet-mapping&gt; &lt;servlet-name&gt;jersey-servlet&lt;/servlet-name&gt; &lt;url-pattern&gt;/api/*&lt;/url-pattern&gt; &lt;/servlet-mapping&gt; &lt;!-- /jersey --&gt; &lt;/web-app&gt; </code></pre> <p>My application context has beans for:</p> <p>dataSource, sessionFactory and userDao.</p> <p>My myapp-servlet.xml has:</p> <pre><code>&lt;context:component-scan base-package="com.myapp" /&gt; </code></pre> <p>(both applicationContext and myapp-servlet.xml have the same xml header node etc. in case that is an issue?)</p>
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