Autowiring not working

Пожалуйста, помогите мне с этой ошибкой, я новичок в весне.Autowiring not working

Это трассировки стека:

12:23:16,350 ERROR [STDERR] java.lang.NullPointerException 
    12:23:16,351 ERROR [STDERR]  at igate.service.ProgramsOfferedServiceImpl.retrievePrograms(ProgramsOfferedServiceImpl.java:39) 
    12:23:16,351 ERROR [STDERR]  at org.apache.jsp.programs_jsp._jspService(programs_jsp.java:118) 
    12:23:16,351 ERROR [STDERR]  at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) 
    12:23:16,351 ERROR [STDERR]  at javax.servlet.http.HttpServlet.service(HttpServlet.java:803) 
    12:23:16,351 ERROR [STDERR]  at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:387) 
    12:23:16,351 ERROR [STDERR]  at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320) 
    12:23:16,351 ERROR [STDERR]  at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266) 
    12:23:16,351 ERROR [STDERR]  at javax.servlet.http.HttpServlet.service(HttpServlet.java:803) 
    12:23:16,351 ERROR [STDERR]  at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) 
    12:23:16,351 ERROR [STDERR]  at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 
    12:23:16,351 ERROR [STDERR]  at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:687) 
    12:23:16,351 ERROR [STDERR]  at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:469) 
    12:23:16,351 ERROR [STDERR]  at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:403) 
    12:23:16,351 ERROR [STDERR]  at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:301) 
    12:23:16,351 ERROR [STDERR]  at org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:238) 
    12:23:16,351 ERROR [STDERR]  at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:250) 
    12:23:16,351 ERROR [STDERR]  at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1047) 
    12:23:16,351 ERROR [STDERR]  at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:817) 
    12:23:16,351 ERROR [STDERR]  at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719) 
    12:23:16,351 ERROR [STDERR]  at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644) 
    12:23:16,351 ERROR [STDERR]  at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:549) 
    12:23:16,351 ERROR [STDERR]  at javax.servlet.http.HttpServlet.service(HttpServlet.java:690) 
    12:23:16,351 ERROR [STDERR]  at javax.servlet.http.HttpServlet.service(HttpServlet.java:803) 
    12:23:16,351 ERROR [STDERR]  at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) 
    12:23:16,351 ERROR [STDERR]  at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 
    12:23:16,351 ERROR [STDERR]  at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96) 
    12:23:16,351 ERROR [STDERR]  at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) 
    12:23:16,351 ERROR [STDERR]  at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 
    12:23:16,351 ERROR [STDERR]  at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230) 
    12:23:16,351 ERROR [STDERR]  at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175) 
    12:23:16,351 ERROR [STDERR]  at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:179) 
    12:23:16,351 ERROR [STDERR]  at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84) 
    12:23:16,351 ERROR [STDERR]  at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128) 
    12:23:16,351 ERROR [STDERR]  at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104) 
    12:23:16,352 ERROR [STDERR]  at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157) 
    12:23:16,352 ERROR [STDERR]  at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) 
    12:23:16,352 ERROR [STDERR]  at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:241) 
    12:23:16,352 ERROR [STDERR]  at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844) 
    12:23:16,352 ERROR [STDERR]  at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:580) 
    12:23:16,352 ERROR [STDERR]  at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447) 
    12:23:16,352 ERROR [STDERR]  at java.lang.Thread.run(Unknown Source)

Это код для доступа к данным:

package igate.dao; 
import java.sql.*; 
import java.util.ArrayList; 
import org.springframework.beans.factory.annotation.Autowired; 
import org.springframework.jdbc.core.JdbcTemplate; 
import org.springframework.jdbc.core.RowMapper; 
import org.springframework.stereotype.Component; 

import igate.dto.ProgramsOffered; 
@Component 
public class ProgramsOfferedDataAccessImpl implements ProgramsOfferedDataAccess 
{ 
    @Autowired 
    JdbcTemplate template; 

    public ProgramsOfferedDataAccessImpl() { 
     // TODO Auto-generated constructor stub 
    System.out.println("inside programs offered"); 
    } 

    @Override 
    public boolean DeleteProgramsOffered(String name)throws SQLException 
    { 
     boolean rowsAffected = false; 
     String delete = "DELETE FROM programs_offered WHERE program_name='"+name+"'"; 
     int r = template.update(delete); 
     if(r>0) 
      rowsAffected=true; 
     return rowsAffected; 
    } 

    @Override 
    public ArrayList<ProgramsOffered> retrievePrograms() 
    { 
     RowMapper<ProgramsOffered> row = new RowMapper<ProgramsOffered>() 
     { 

      @Override 
      public ProgramsOffered mapRow(ResultSet rs, int arg1) throws SQLException 
      { 
       ProgramsOffered po = new ProgramsOffered(); 
       po.setProgramName(rs.getString(1)); 
       po.setDescription(rs.getString(2)); 
       po.setApplicantEligibility(rs.getString(3)); 
       po.setDuration(rs.getInt(4)); 
       po.setDegreeCertificateOffered(rs.getString(5)); 
       return po; 
      } 

     }; 
     String sql = "select * from programs_offered"; 
     System.out.println(template); 
     return (ArrayList<ProgramsOffered>)template.query(sql, row); 
    } 

    @Override 
    public boolean insertProgram(ProgramsOffered po) 
    { 
     boolean rowsAffected = false; 
     String insert = "insert into programs_offered values(?,?,?,?,?)"; 
     int r = template.update(insert); 
     if(r>0) 
      rowsAffected=true; 
     return rowsAffected; 
    } 

    @Override 
    public boolean updateProgram(String progName, String colName, String newValue) 
    { 
     return false; 
    } 

    @Override 
    public boolean updateProgram(String progName, String colName, int newValue) 
    { 
     return false; 
    } 

    public JdbcTemplate getTemplate() 
    { 
     return template; 
    } 

    public void setTemplate(JdbcTemplate template) 
    { 
     this.template = template; 
    } 
}

Это мой уровень услуг. Я не могу понять, в чем проблема, поскольку я автоматически подключаю ProgramsOffered poda, но я все еще получаю исключение из null-указателя.

package igate.service; 
import java.sql.SQLException; 
import java.util.ArrayList; 

import org.springframework.beans.factory.annotation.Autowired; 
import org.springframework.stereotype.Component; 

import igate.dao.*; 
import igate.dto.ProgramsOffered; 
@Component("offeredService") 
public class ProgramsOfferedServiceImpl implements ProgramsOfferedService 
{ 
    @Autowired 
    public ProgramsOfferedDataAccess poda; 


    @Override 
    public boolean DeleteProgramsOffered(String name) 
    { 
     boolean rowsaffected=false; 
     try 
     { 
      rowsaffected = poda.DeleteProgramsOffered(name); 

     } 
     catch(SQLException e) 
     { 
      e.printStackTrace(); 
     } 
     catch (Exception e) 
     { 
      e.printStackTrace(); 
     } 
     return rowsaffected; 
    } 
    @Override 
    public ArrayList<ProgramsOffered> retrievePrograms() 
    { 
     ArrayList<ProgramsOffered> al = poda.retrievePrograms(); 
     return al; 
    } 
    @Override 
    public boolean insertProgram(ProgramsOffered po) 
    { 

     return poda.insertProgram(po); 
    } 
    @Override 
    public boolean updateProgram(String progName, String colName, String newValue) 
    { 

     return poda.updateProgram(progName, colName, newValue); 
    } 
    @Override 
    public boolean updateProgram(String progName, String colName, int newValue) 
    { 

     return poda.updateProgram(progName, colName, newValue); 
    } 
    @Override 
    public ArrayList<ProgramsOffered> programDetails(String programName) 
    { 
     ArrayList<ProgramsOffered> list = new ArrayList<ProgramsOffered>(); 
     list = poda.retrievePrograms(); 
     System.out.println("to keep at 0 "+programName); 
     System.out.println("list size:" +list.size()); 
     int size = list.size(); 
     for(int i = 0;i<size;i++) 
     { 
      System.out.println(i); 
      if(!list.get(i).getProgramName().trim().equals(programName)) 
      { 
       System.out.println("removing: "+list.get(i).getProgramName()); 
       //list.remove(i); 
      } 
      else 
      { 
       ProgramsOffered temp = new ProgramsOffered(); 
       temp = list.get(0); 
       list.set(0, list.get(i)); 
       list.set(i, temp); 
       System.out.println("at 0 prog: "+list.get(0)); 
      } 
     } 
     return list; 
    } 


}

Я получаю исключения нулевого указателя на этой линии: ArrayList<ProgramsOffered> al = poda.retrievePrograms();

<?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:mvc="http://www.springframework.org/schema/mvc" 
     xmlns:aop="http://www.springframework.org/schema/aop" 
     xmlns:tx="http://www.springframework.org/schema/tx" 
     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/mvc 
     http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd 
     http://www.springframework.org/schema/aop 
     http://www.springframework.org/schema/aop/spring-aop-3.0.xsd 
     http://www.springframework.org/schema/tx 
     http://www.springframework.org/schema/tx/spring-tx-3.0.xsd"> 

      <mvc:annotation-driven /> 
      <context:annotation-config/> 
      <context:component-scan base-package="igate.dto" /> 
       <context:component-scan base-package="igate.dao" /> 
        <context:component-scan base-package="igate.service" /> 
         <context:component-scan base-package="igate.controller" /> 
       <context:component-scan base-package="igate.logs" /> 
        <context:component-scan base-package="igate.testcases" /> 


      <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> 
        <property name="prefix" value="/"/> 
        <property name="suffix" value=".jsp" /> 
      </bean> 


      <bean id="ds" class="org.springframework.jdbc.datasource.DriverManagerDataSource"> 
       <property name="driverClassName" value="oracle.jdbc.driver.OracleDriver" /> 
       <property name="url" value="jdbc:oracle:thin:@172.21.17.5:1521:oraten" /> 
       <property name="username" value="lab01trg21" /> 
       <property name="password" value="lab01oracle" /> 
      </bean> 

      <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate"> 
       <property name="dataSource" ref="ds"/> 
      </bean> 

</beans>

источник

2013-09-27 Amit

Откуда ты звонишь этот метод? Судя по stacktrace, вы пытаетесь вызвать свою службу с JSP. Судя по тому, что вы создаете экземпляр самостоятельно в JSP и ожидаете, что Spring автоматически выполнит его, вы должны использовать его из контекста приложения. Или даже лучше не делайте такие вещи в своем слое View, которые должны быть оставлены на '(@) Controller'. –

-1

Вы делаете nothave сеттеров и добытчиками для Пода. Без сеттеров и добытчиками Spring не autowire

источник

2013-09-27 07:06:19

добавлены сеттеры и геттеры, все еще получающие ошибку в ArrayList al = poda.retrievePrograms(); – Amit

ли ваш applicationContext.xml (или грузоотправитель-servlet.xml) содержат следующие строки:

<!-- Use annotation based configuration (e.g. @Service, @Component etc.) --> 
<context:annotation-config/> 
<!-- Autowire beans --> 
<context:component-scan base-package="igate.service"/>

источник

2013-09-27 07:44:33

все еще получаю ошибку на той же линии – Amit

Я добавил мой context.xml – Amit

Autowiring not working

ответ

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