Spring 社交版本1.0.3 : Why i've Field or property 'name' cannot be found on null error

Question

我使用 Spring Social 1.0.3 在我的登录页面上添加“使用 Facebook 登录”和“使用 Twitter 登录”。这是我的登录 View 页面:

登录 View :

 <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>

Spring 社交 xml 配置:

<context:property-placeholder location="classpath:application.properties" />

    <bean id="connectionFactoryLocator" 
      class="org.springframework.social.connect.support.ConnectionFactoryRegistry">
    <property name="connectionFactories">
        <list>
            <bean class="org.springframework.social.twitter.connect.TwitterConnectionFactory">
                <constructor-arg value="${twitter.consumerKey}" />
                <constructor-arg value="${twitter.consumerSecret}" />               
            </bean>
            <bean class="org.springframework.social.facebook.connect.FacebookConnectionFactory">
                <constructor-arg value="${facebook.clientId}" />
                <constructor-arg value="${facebook.clientSecret}" />                
            </bean>
        </list>
    </property>
</bean>

<bean id="usersConnectionRepository" 
      class="org.springframework.social.connect.jdbc.JdbcUsersConnectionRepository">
    <constructor-arg ref="dataSource" />
    <constructor-arg ref="connectionFactoryLocator" />
    <constructor-arg ref="textEncryptor" />
</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>

 <bean id="textEncryptor" class="org.springframework.security.crypto.encrypt.Encryptors" 
                factory-method="noOpText">

        </bean>

<bean class="org.springframework.social.connect.web.ConnectController">
    <!-- relies on by-type autowiring for the constructor-args -->
    <property name="applicationUrl" value="${application.url}" />
</bean>
</beans>

应用程序属性文件:

#Facebook
facebook.clientId=ideletetherealvalue
facebook.clientSecret=ideletetherealvalue

#Twitter
twitter.consumerKey=ideletetherealvalue
twitter.consumerSecret=ideletetherealvalue

application.url=http://localhost:8080/myapp

url应用http://localhost:8080/myapp在facebook应用中被授权。

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

1.Twitter 当我提交我的凭据时，另一个页面要求我允许该申请 我允许该应用程序，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

完整的错误在这里http://pastebin.com/hyRicyFu

问题: 据我了解，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“名称”

我需要一些确认: a- 当用户提交时，我是否要在数据库中创建用户？我必须扩展哪个 Controller ？如果有人有一个例子会有所帮助

b- 如果我错了，发生了什么，为什么我收到错误？

Answer 1

是的，您是对的 - 问题在于该配置。

<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>

上面创建了一个连接存储库，其构造函数的参数为​​ request.userPrincipal.name - 这仅在您的用户已经登录时才有效(这是尝试实例化每个请求主要用户的存储库 - 因此需要一个用于绑定(bind)该存储库的 ID)。

查看专门用于处理社交登录的文档:http://docs.spring.io/spring-social/docs/1.0.3.RELEASE/reference/html/signin.html

您将看到社交注册有一种完全不同的方法(与与社交第三方集成的登录用户相比)