Spring не может связывать класс DAOImpl java.lang.NullPointerException

Question

У меня есть моя конечная точка обслуживания, вызывающая метод get() в моем DAO, но с ошибкой с java.lang.NullPointerException. в то время отладки, кажется, весна не может найти реализацию моего DAO

ContactEndoint

package com.spring.contacts; 

@Endpoint 
@Configuration 
@ComponentScan(basePackages="com.spring.contacts") 
@EnableWebMvc 
public class ContactEndpoint { 
private static final String NAMESPACE_URI = "http://spring.io/guides/gs-producing-web-service"; 

@Autowired 
private ContactDAO contactDAO; 

//Default constructor 
public ContactEndpoint(){ 
} 

@Autowired 
public ContactEndpoint(ContactDAO contactDAO) { 
this.contactDAO = contactDAO; 
} 

@Cacheable(cacheName="imageCache", keyGenerator=@KeyGenerator(name="StringKeyCache")) 
@PayloadRoot(namespace = NAMESPACE_URI, localPart = "getContactRequest") 
@RequestMapping(value = "/editContact", method = RequestMethod.GET) 
@ResponsePayload 
public GetContactResponse getContact(@RequestPayload GetContactRequest request){ 
    GetContactResponse response = new GetContactResponse(); 
    response.setContact(contactDAO.get(request.getId())); 
    return response; 
} 

ContactDAO

package com.spring.contacts.dao; 


public interface ContactDAO { 

public Contact get(int contactId); 

ContactDAOImpl

package com.spring.contacts.dao; 

@Repository("contactDAO") 
public class ContactDAOImpl implements ContactDAO { 

private JdbcTemplate jdbcTemplate; 

//default constructor 
public ContactDAOImpl(){ 
} 

public ContactDAOImpl(DataSource dataSource) { 
    jdbcTemplate = new JdbcTemplate(dataSource); 
} 

@Override 
public Contact get(int contactId) { 
    String sql = "SELECT * FROM contact WHERE contact_id=" + contactId; 
    return jdbcTemplate.query(sql, new ResultSetExtractor<Contact>() { 

     @Override 
     public Contact extractData(ResultSet rs) throws SQLException, 
       DataAccessException { 
      if (rs.next()) { 
       Contact contact = new Contact(); 
       contact.setId(rs.getInt("contact_id")); 
       contact.setName(rs.getString("name")); 
       contact.setEmail(rs.getString("email")); 
       contact.setAdress(rs.getString("address")); 
       contact.setTelephone(rs.getString("telephone")); 
       return contact; 
      } 

      return null; 
     } 

    }); 
} 

WebServiceConfig

package com.spring.contacts; 

@EnableWs 
@Configuration 
@ComponentScan("com.spring") 
public class WebServiceConfig extends WsConfigurerAdapter { 
@Bean 
public ServletRegistrationBean messageDispatcherServlet(ApplicationContext applicationContext) { 
    MessageDispatcherServlet servlet = new MessageDispatcherServlet(); 
    servlet.setApplicationContext(applicationContext); 
    servlet.setTransformWsdlLocations(true); 
    return new ServletRegistrationBean(servlet, "/ws/*"); 
} 

@Bean(name = "countries") 
public DefaultWsdl11Definition defaultWsdl11Definition(XsdSchema countriesSchema) { 
    DefaultWsdl11Definition wsdl11Definition = new DefaultWsdl11Definition(); 
    wsdl11Definition.setPortTypeName("CountriesPort"); 
    wsdl11Definition.setLocationUri("/ws"); 
    wsdl11Definition.setTargetNamespace("http://spring.io/guides/gs-producing-web-service"); 
    wsdl11Definition.setSchema(countriesSchema); 
    return wsdl11Definition; 
} 

@Bean(name = "contacts") 
public DefaultWsdl11Definition defaultContactsWsdl11Definition(XsdSchema contactsSchema){ 
    DefaultWsdl11Definition wsdl11Definition = new DefaultWsdl11Definition(); 
    wsdl11Definition.setPortTypeName("ContactsPort"); 
    wsdl11Definition.setLocationUri("/ws/JDBC"); 
    wsdl11Definition.setTargetNamespace("http://spring.io/guides/gs-producing-web-service"); 
    wsdl11Definition.setSchema(contactsSchema); 
return wsdl11Definition; 

    } 


@Bean 
public XsdSchema countriesSchema() { 
    return new SimpleXsdSchema(new ClassPathResource("countries/countries.xsd")); 
} 

@Bean 
public XsdSchema contactsSchema(){ 
    return new SimpleXsdSchema(new ClassPathResource("contacts/contact.xsd")); 
} 

StackTrace

java.lang.NullPointerException: null 
at com.spring.contacts.dao.ContactDAOImpl.get(ContactDAOImpl.java:85) ~[ContactDAOImpl.class:na] 
at com.spring.contacts.dao.ContactDAOImpl$$FastClassBySpringCGLIB$$f0feb335.invoke(<generated>) ~[spring-core-4.1.6.RELEASE.jar:na] 
at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204) ~[spring-core-4.1.6.RELEASE.jar:4.1.6.RELEASE] 
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:717) ~[spring-aop-4.1.6.RELEASE.jar:4.1.6.RELEASE] 
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157) ~[spring-aop-4.1.6.RELEASE.jar:4.1.6.RELEASE] 
at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:136) ~[spring-tx-4.1.6.RELEASE.jar:4.1.6.RELEASE] 
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.1.6.RELEASE.jar:4.1.6.RELEASE] 
at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:653) ~[spring-aop-4.1.6.RELEASE.jar:4.1.6.RELEASE] 
at com.spring.contacts.dao.ContactDAOImpl$$EnhancerBySpringCGLIB$$5f3048d3.get(<generated>) ~[spring-core-4.1.6.RELEASE.jar:na] 
at com.spring.contacts.ContactEndpoint.getContact(ContactEndpoint.java:45) ~[ContactEndpoint.class:na] 
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.7.0_25] 
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) ~[na:1.7.0_25] 
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.7.0_25] 
at java.lang.reflect.Method.invoke(Method.java:606) ~[na:1.7.0_25] 
at org.springframework.ws.server.endpoint.MethodEndpoint.invoke(MethodEndpoint.java:134) ~[spring-ws-core-2.2.1.RELEASE.jar:2.2.1.RELEASE] 
at org.springframework.ws.server.endpoint.adapter.DefaultMethodEndpointAdapter.invokeInternal(DefaultMethodEndpointAdapter.java:291) ~[spring-ws-core-2.2.1.RELEASE.jar:2.2.1.RELEASE] 
at org.springframework.ws.server.endpoint.adapter.AbstractMethodEndpointAdapter.invoke(AbstractMethodEndpointAdapter.java:55) ~[spring-ws-core-2.2.1.RELEASE.jar:2.2.1.RELEASE] 
at org.springframework.ws.server.MessageDispatcher.dispatch(MessageDispatcher.java:236) [spring-ws-core-2.2.1.RELEASE.jar:2.2.1.RELEASE] 
at org.springframework.ws.server.MessageDispatcher.receive(MessageDispatcher.java:176) [spring-ws-core-2.2.1.RELEASE.jar:2.2.1.RELEASE] 
at org.springframework.ws.transport.support.WebServiceMessageReceiverObjectSupport.handleConnection(WebServiceMessageReceiverObjectSupport.java:89) ~[spring-ws-core-2.2.1.RELEASE.jar:2.2.1.RELEASE] 
at org.springframework.ws.transport.http.WebServiceMessageReceiverHandlerAdapter.handle(WebServiceMessageReceiverHandlerAdapter.java:61) ~[spring-ws-core-2.2.1.RELEASE.jar:2.2.1.RELEASE] 
at org.springframework.ws.transport.http.MessageDispatcherServlet.doService(MessageDispatcherServlet.java:293) ~[spring-ws-core-2.2.1.RELEASE.jar:2.2.1.RELEASE] 
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:966) ~[spring-webmvc-4.1.6.RELEASE.jar:4.1.6.RELEASE] 
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:868) ~[spring-webmvc-4.1.6.RELEASE.jar:4.1.6.RELEASE] 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:648) ~[servlet-api.jar:na] 
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842) ~[spring-webmvc-4.1.6.RELEASE.jar:4.1.6.RELEASE] 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729) ~[servlet-api.jar:na] 
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291) ~[catalina.jar:8.0.21] 
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) ~[catalina.jar:8.0.21] 
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) ~[tomcat-websocket.jar:8.0.21] 
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) ~[catalina.jar:8.0.21] 
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) ~[catalina.jar:8.0.21] 
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219) ~[catalina.jar:8.0.21] 
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106) ~[catalina.jar:8.0.21] 
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502) ~[catalina.jar:8.0.21] 
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142) ~[catalina.jar:8.0.21] 
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) ~[catalina.jar:8.0.21] 
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:610) ~[catalina.jar:8.0.21] 
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88) ~[catalina.jar:8.0.21] 
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:518) ~[catalina.jar:8.0.21] 
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1091) ~[tomcat-coyote.jar:8.0.21] 
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:668) ~[tomcat-coyote.jar:8.0.21] 
at org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:223) ~[tomcat-coyote.jar:8.0.21] 
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1517) ~[tomcat-coyote.jar:8.0.21] 
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1474) ~[tomcat-coyote.jar:8.0.21] 
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) ~[na:1.7.0_25] 
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) ~[na:1.7.0_25] 
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) ~[tomcat-util.jar:8.0.21] 
at java.lang.Thread.run(Thread.java:724) ~[na:1.7.0_25] 

Answer 1

Я установил ее, вводя в источник данных DAOImpl с использованием @Autowired

@Autowired 
public ContactDAOImpl(DataSource dataSource) { 
    jdbcTemplate = new JdbcTemplate(dataSource); 
}