spring社交版1.0.3：为什么我'；ve字段或属性'；名称'；在空错误上找不到

我使用SpringSocial1.0.3在我的登录页面上添加“使用Facebook登录”和“使用Twitter登录”。这里是我的登录查看页面：

登录视图：

 <form action="<c:url value="/connect/twitter" />" method="POST">
  <p><button type="submit"><img src="<c:url value="/resources/images/social/twitter/sign-in-with-twitter-d.png" />"/>
    </button></p>
</form>

  <form action="<c:url value="/connect/facebook" />" method="POST">
  <p><button type="submit"><img src="<c:url value="/resources/images/social/facebook/sign-in-with-facebook.png" />"/>
    </button></p>
</form>

url应用程序

http://localhost:8080/myapp

已在facebook应用程序中授权

当我点击“使用Twitter登录”或“使用Facebook登录”时，我会被重定向到Twitter或Facebook以提交我的登录名和密码

1.Twitter当我提交凭据时，另一个页面要求我允许该应用程序 我允许应用程序，然后出现以下错误：

DEBUG [org.springframework.web.servlet.mvc.support.DefaultHandlerExceptionResolver] [] http-bio-8080-exec-10 Resolving exception from handler [public java.lang.String org.springframework.social.connect.web.ConnectController.connectionStatus(java.lang.String,org.springframework.web.context.request.NativeWebRequest,org.springframework.ui.Model)]: org.springframework.beans.factory.BeanExpressionException: Expression parsing failed; nested exception is org.springframework.expression.spel.SpelEvaluationException: EL1007E:(pos 0): Field or property 'name' cannot be found on null
    DEBUG [org.springframework.web.servlet.DispatcherServlet] [] http-bio-8080-exec-10 Could not complete request
    org.springframework.beans.factory.BeanExpressionException: Expression parsing failed; nested exception is org.springframework.expression.spel.SpelEvaluationException: EL1007E:(pos 0): Field or property 'name' cannot be found on null


The complete error is here http://pastebin.com/hyRicyFu

2.Facebook当我提交凭据时，我会出现以下错误：

org.springframework.beans.factory.BeanExpressionException: Expression parsing failed; nested exception is org.springframework.expression.spel.SpelEvaluationException: EL1007E:(pos 0): Field or property 'name' cannot be found on null
DEBUG [org.springframework.web.servlet.mvc.support.DefaultHandlerExceptionResolver] [] http-bio-8080-exec-2 Resolving exception from handler [public java.lang.String org.springframework.social.connect.web.ConnectController.connectionStatus(java.lang.String,org.springframework.web.context.request.NativeWebRequest,org.springframework.ui.Model)]: org.springframework.beans.factory.BeanExpressionException: Expression parsing failed; nested exception is org.springframework.expression.spel.SpelEvaluationException: EL1007E:(pos 0): Field or property 'name' cannot be found on null
DEBUG [org.springframework.web.servlet.DispatcherServlet] [] http-bio-8080-exec-2 Could not complete request
org.springframework.beans.factory.BeanExpressionException: Expression parsing failed; nested exception is org.springframework.expression.spel.SpelEvaluationException: EL1007E:(pos 0): Field or property 'name' cannot be found on null

完全的错误就在这里

问题： 据我所知，这个错误来自

<bean id="connectionRepository" factory-method="createConnectionRepository" 
      factory-bean="usersConnectionRepository" scope="request">
    <constructor-arg value="#{request.userPrincipal.name}" />
    <aop:scoped-proxy proxy-target-class="false" />
</bean>

错误消息：在null上找不到字段或属性“name”

我需要一些确认： 当用户提交时，我必须在数据库中创建用户吗？我必须扩展哪个控制器？如果有人举个例子，这会有所帮助

---

b-如果我错了，发生了什么，为什么我会出错？

是的，你是对的-问题在于配置

<bean id="connectionRepository" factory-method="createConnectionRepository" 
      factory-bean="usersConnectionRepository" scope="request">
    <constructor-arg value="#{request.userPrincipal.name}" />
    <aop:scoped-proxy proxy-target-class="false" />
</bean>

您将看到，对于社交注册，有一种完全不同的方法（相对于与社交第三方集成的登录用户）

<bean id="connectionRepository" factory-method="createConnectionRepository" 
      factory-bean="usersConnectionRepository" scope="request">
    <constructor-arg value="#{request.userPrincipal.name}" />
    <aop:scoped-proxy proxy-target-class="false" />
</bean>

<bean id="connectionRepository" factory-method="createConnectionRepository" 
      factory-bean="usersConnectionRepository" scope="request">
    <constructor-arg value="#{request.userPrincipal.name}" />
    <aop:scoped-proxy proxy-target-class="false" />
</bean>