java.lang.NullPointerException на @autowired интерфейсе

Я пытаюсь создать веб-сервис для отдыха на Java (Джерси) с помощью Spring и MongoDB. Однако я столкнулся с ошибкой, которую я не могу исправить.java.lang.NullPointerException на @autowired интерфейсе

Мой проект содержит слой RESOURCE, SERVICE и REPOSITORY. Эти слои содержат 1 интерфейс и 1 класс, который реализует интерфейс.

Я бегу в следующее сообщение об ошибке:

ОШИБКА:

Oct 02, 2014 10:49:39 AM com.sun.jersey.spi.spring.container.servlet.SpringServlet getContext 
INFO: Using default applicationContext 
Oct 02, 2014 10:49:39 AM com.sun.jersey.server.impl.application.WebApplicationImpl _initiate 
INFO: Initiating Jersey application, version 'Jersey: 1.18 11/22/2013 01:21 AM' 
Oct 02, 2014 10:49:43 AM com.sun.jersey.spi.container.ContainerResponse mapMappableContainerException 
SEVERE: The RuntimeException could not be mapped to a response, re-throwing to the HTTP container 
java.lang.NullPointerException 
    at rest.Resource.AircraftResource.findAllAircraft(AircraftResource.java:44) 
    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.spi.container.JavaMethodInvokerFactory$1.invoke(JavaMethodInvokerFactory.java:60) 
    at com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$TypeOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:185) 
    at com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:75) 
    at com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:302) 
    at com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:108) 
    at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147) 
    at com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:84) 
    at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1542) 
    at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1473) 
    at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1419) 
    at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1409) 
    at com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:409) 
    at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:540) 
    at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:715) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:725) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219) 
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106) 
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505) 
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142) 
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) 
    at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:610) 
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88) 
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:534) 
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1081) 
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:658) 
    at org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:222) 
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1566) 
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1523) 
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) 
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) 
    at java.lang.Thread.run(Unknown Source) 

Oct 02, 2014 10:49:43 AM com.sun.jersey.spi.container.ContainerResponse mapMappableContainerException 
SEVERE: The RuntimeException could not be mapped to a response, re-throwing to the HTTP container 
java.lang.NullPointerException 
    at rest.Resource.AircraftResource.findAllAircraft(AircraftResource.java:44) 
    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.spi.container.JavaMethodInvokerFactory$1.invoke(JavaMethodInvokerFactory.java:60) 
    at com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$TypeOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:185) 
    at com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:75) 
    at com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:302) 
    at com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:108) 
    at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147) 
    at com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:84) 
    at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1542) 
    at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1473) 
    at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1419) 
    at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1409) 
    at com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:409) 
    at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:540) 
    at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:715) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:725) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219) 
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106) 
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505) 
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142) 
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) 
    at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:610) 
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88) 
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:534) 
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1081) 
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:658) 
    at org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:222) 
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1566) 
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1523) 
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) 
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) 
    at java.lang.Thread.run(Unknown Source)

ЛИНИЯ 46:

List<Aircraft> results = aircraftService.findAllAircraft();

aircraftService является NULL. Однако я autowire это следующим образом в моем классе ресурсов:

ресурсов класса

@Component 
@Path("/aircraft") 
public class AircraftResource implements IAircraftResource 
{ 

    static final Logger logger = LoggerFactory.getLogger(AircraftResource.class); 

    @Autowired 
    IAircraftService aircraftService; 

    @Override 
    @GET 
    @Produces({MediaType.APPLICATION_JSON}) 
    public List<Aircraft> findAllAircraft() 
    { 
    List<Aircraft> results = aircraftService.findAllAircraft(); 
    return results; 
    }

Мой ApplicationContext для использования @autowire:

<?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:context="http://www.springframework.org/schema/context" 
        xmlns:mongo="http://www.springframework.org/schema/data/mongo" 
     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 
      http://www.springframework.org/schema/data/mongo 
    http://www.springframework.org/schema/data/mongo/spring-mongo-1.0.xsd 
     http://www.springframework.org/schema/data/jpa 
    http://www.springframework.org/schema/data/jpa/spring-jpa.xsd 
     "> 

    <context:component-scan base-package="rest"> 
     <context:exclude-filter type="annotation" expression="org.springframework.context.annotation.Configuration"/> 
    </context:component-scan> 

    <bean id="mongoTemplate" class="org.springframework.data.mongodb.core.MongoTemplate"> 
    <constructor-arg name="mongo" ref="mongo"/> 
    <constructor-arg name="databaseName" value="iffdb"/> 
    </bean> 

    <bean id="mongo" class="org.springframework.data.mongodb.core.MongoFactoryBean"> 
    <property name="host" value="localhost"/> 
    </bean> 

    <bean class="org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor"/> 

</beans>

Интерфейс IAircraftService, который используется:

public interface IAircraftService 
{ 
public List<Aircraft> findAllAircraft(); 
}

Воздух craftService класс, который реализует этот интерфейс:

@Service 
@Scope("singleton") 
public class AircraftService implements IAircraftService 
{ 

    static final Logger logger = LoggerFactory.getLogger(AircraftService.class); 

    @Autowired private IAircraftRepository aircraftRepository; 

    @Override 
    public List<Aircraft> findAllAircraft() 
    { 
     List<Aircraft> results = aircraftRepository.findAllAircraft(); 
     return results; 
    } 
}

web.xml:

<!DOCTYPE web-app PUBLIC 
"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" 
"http://java.sun.com/dtd/web-app_2_3.dtd" > 

<web-app> 

    <display-name>projectPiranha</display-name> 

    <context-param> 
     <param-name>contextConfigLocation</param-name> 
     <param-value>classpath*:applicationContext*.xml</param-value> 
    </context-param> 

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

    <servlet> 
    <servlet-name>JerseyWebApplication</servlet-name> 
    <servlet-class>com.sun.jersey.spi.spring.container.servlet.SpringServlet</servlet-class> 
     <init-param> 
      <param-name>com.sun.jersey.config.property.packages</param-name> 
      <param-value>rest</param-value> 
     </init-param> 
     <init-param> 
      <param-name>com.sun.jersey.api.json.POJOMappingFeature</param-name> 
      <param-value>true</param-value> 
     </init-param> 
    </servlet> 

    <servlet-mapping> 
    <servlet-name>JerseyWebApplication</servlet-name> 
    <url-pattern>/v1/*</url-pattern> 
    </servlet-mapping> 

    <welcome-file-list> 
    <welcome-file>index.html</welcome-file> 
    <welcome-file>index.htm</welcome-file> 
    <welcome-file>index.jsp</welcome-file> 
    </welcome-file-list> 

    </web-app>

я боролся с этой ошибкой в течение нескольких часов в настоящее время и был бы весьма признателен любой вход по поводу этой ошибки. Заранее спасибо.

источник

2014-10-02 HelpMeFigureThisOut

Можете ли вы вставить конфигурацию сервлета (web.xml или конфигурацию Java)? – luboskrnac

Можете ли вы попытаться добавить @Qualifier («AircraftService») в объявление сервиса и '@ Autovire'? – Jens

Я добавил квалификаторы, но все равно не повезло. Я разместил свой web.xml выше. – HelpMeFigureThisOut

Я не уверен, но чувствую, что вы не вводите какие-либо бобы для AicraftService. Однако ошибка не в этом, поэтому я могу ошибаться.

источник

2014-10-02 11:05:20 Rufi

java.lang.NullPointerException на @autowired интерфейсе

ответ

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