春天社會applicationURL設置例外

Question

春天社交版1.1.0.RELEASE，我需要建立applicationUrl爲ProviderSignInController，我的應用程序（一個Tomcat應用程序）在代理（Apache Web服務器）託管。根據Spring Social document，我將它設置如下：

<bean id="providerSignInController" 
    class="org.springframework.social.connect.web.ProviderSignInController"> 
    <property name="signInUrl" value="/accounts/login" /> 
    <property name="signUpUrl" value="/accounts/signup" /> 
    <property name="postSignInUrl" value="/accounts/profile" /> 
    <property name="applicationUrl" value="${applicationUrl}" /> 
</bean> 

但是，部署應用程序時，我得到在Tomcat中的異常catalina.out中說：

PropertyAccessException 1: 
org.springframework.beans.MethodInvocationException: Property 
'applicationUrl' threw exception; nested exception is 
java.lang.NullPointerException>org.springframework.beans.factory.BeanCreationException: 
Error creating bean with name 
'org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping#0' 
defined in ServletContext resource [/WEB-INF/spring-servlet.xml]: 
Initialization of bean failed; nested exception is 
org.springframework.beans.factory.BeanCreationException: Error creating 
bean with name 'providerSignInController' defined in ServletContext 
resource [/WEB-INF/spring-servlet.xml]: Error setting property values; 
nested exception is 
org.springframework.beans.PropertyBatchUpdateException; nested 
PropertyAccessExceptions (1) are: 
PropertyAccessException 1: 
org.springframework.beans.MethodInvocationException: Property 
'applicationUrl' threw exception; nested exception is 
java.lang.NullPointerException 
     at 
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:527) 

任何建議嗎？謝謝。

Answer 1

它應該是Spring Social version 1.1.0.RELEASE中的類ProviderSignInController的一個bug。在類ProviderSignInController，connectSupport被屬性被設置之後創建的：

public void afterPropertiesSet() throws Exception { 
    this.connectSupport = new ConnectSupport(sessionStrategy); 
    this.connectSupport.setUseAuthenticateUrl(true); 
}; 

因此被調用方法setApplicationUrl時，connectSupport仍然是空。

現在，當我按照下面所示的方式進行配置時，它可以工作。或者，如果我恢復到版本1.0.3.RELEASE，它也可以正常工作。

<bean id="providerSignInController" 
    class="org.springframework.social.connect.web.ProviderSignInController"> 
    <property name="signInUrl" value="/accounts/login" /> 
    <property name="signUpUrl" value="/accounts/signup" /> 
    <property name="postSignInUrl" value="/accounts/profile" /> 
</bean> 
<bean 
    class="org.springframework.beans.factory.config.MethodInvokingFactoryBean"> 
    <property name="targetObject" ref="providerSignInController" /> 
    <property name="targetMethod" value="setApplicationUrl" /> 
    <property name="arguments"> 
     <list> 
      <bean class="java.lang.String"> 
       <constructor-arg value="${applicationUrl}" /> 
      </bean> 
     </list> 
    </property> 
</bean> 

後續

這個問題已經在社會春季版1.1.3.RELEASE解決。在課堂上ProviderSignInController，方法afterPropertiesSet方法已經更新到：

public void afterPropertiesSet() throws Exception { 
    this.connectSupport = new ConnectSupport(sessionStrategy); 
    this.connectSupport.setUseAuthenticateUrl(true); 
    if (this.applicationUrl != null) { 
     this.connectSupport.setApplicationUrl(applicationUrl); 
    } 
}; 

其結果是，上面給出的配置的解決辦法，現在（順便說一下，不會與春天社會1.1.3.RELEASE版本更多的工作）可以簡化爲：

<bean id="providerSignInController" 
    class="org.springframework.social.connect.web.ProviderSignInController"> 
    <property name="signInUrl" value="/accounts/login" /> 
    <property name="signUpUrl" value="/accounts/signup" /> 
    <property name="postSignInUrl" value="/accounts/profile" /> 
    <property name="applicationUrl" value="${applicationUrl}" /> 
</bean>