@Autowired給我NPE

源代碼是@Autowired給我NPE

public class MailSenzer { 
@Autowired 
private JavaMailSender mailSender; 

public void setMailSender(JavaMailSender mailSender) { this.mailSender = mailSender; } 

public static void send(MailForm mail) { 
    new MailSenzer().senz(mail); 
} 

private void senz(MailForm mail) { 
    MimeMessage msger = mailSender.createMimeMessage(); 

    try { 
     MimeMessageHelper msg = new MimeMessageHelper(msger, mail.getEncoding()); 
     msg.setSubject(mail.getSubject()); 
     msg.setText(mail.getContent(), true); 
     msg.setFrom(new InternetAddress(mail.getFrom())); 
     msg.setTo(new InternetAddress(mail.getTo(), mail.getTo_name(), mail.getEncoding())); 

     if(mail.getAttachment() != null) { 
      msg.addAttachment(MimeUtility.encodeText(mail.getAttachment_name(), "euc-kr", "B"), mail.getAttachment()); 
     } 
    } catch(Exception ex) { System.out.println(ex); } 

    try { 
     mailSender.send(msger); 
    } catch(Exception ex) { System.out.println(ex); } 
}

}

這是我寫的代碼。我在控制器中精確地測試了相同的代碼，但是，當我試圖以靜態方法運行時，它給了我一個錯誤。

java.lang.NullPointerException 
at kr.co.ubplay.utility.mail.MailSenzer.senz(MailSenzer.java:25) 
at kr.co.ubplay.utility.mail.MailSenzer.send(MailSenzer.java:21) 
at kr.co.ubplay.service.b2biz.controller.CoopEmailController.coop_send(CoopEmailController.java:116) 
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) 
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 
at java.lang.reflect.Method.invoke(Method.java:597) 
at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:213) 
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:126) 
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:96) 
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:617) 
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:578) 
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80) 
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:923) 
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:852) 
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882) 
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:789) 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:647) 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728) 
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305) 
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) 
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88) 
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76) 
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243) 
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) 
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222) 
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123) 
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472) 
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171) 
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99) 
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:936) 
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) 
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407) 
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1004) 
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589) 
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:1822) 
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) 
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) 
at java.lang.Thread.run(Thread.java:662)

而且具有NPE線路

MimeMessage msger = mailSender.createMimeMessage();

我有一個名爲com.ubis掃描一個共同的包，所有的包都到該域下。

這發生在jsp 2.0中的自定義標籤庫中。我試圖訪問一個工作的道，但這也給自動裝配的sqlSession帶來了麻煩。想不出有什麼不對這些問題:(

來源

2013-02-21 Steve Gom

在春天定義「mailSender」bean嗎？ – Jason 2013-02-21 06:16:46

@jason我做了..但沒有工作 – 2013-02-21 06:38:23

使用'new'關鍵字創建的對象永遠不會被spring自動裝配。你需要從應用程序上下文獲取bean。 – Affe 2013-02-21 06:43:18

。

如果想要使用Autowired，然後使用任何註釋使它成爲spring bean。

來源

2013-02-21 08:56:08

這讓我想起了Spring如何工作:)感謝這個主意！ – 2013-02-25 04:26:05

讓MailSenzer是一個Spring bean，並JavaMailSender將自動有線。Spring不會自動線豆與new（由@Affe提及）創建的對象。嘗試建立更多的「春天像」系統，如果你開始當您使用新的，那麼你必須處理它，同樣不能被裝配一個bean使用它IoC容器:)

@Service 
public class MailSender { 

@Autowired 
private JavaMailSender mailSender; 

// other stuff 

} 

public class SomeBusinessLogicClass { 

@Autowired 
private MailSender mailSender; 

// other stuff 

}

來源

2013-02-21 06:57:37 udalmik

@Autowired給我NPE

回答

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