why Spring security getPrincipal is giving NullPointer

Question

i'm trying to get the logged in user to show its informations in jsf index page which you need to be logged in to access it , i can't access the login page because the exception preventing the project from working, like the title says i'm getting nullpointer exception , i'm using spring 4 , java 7 .

Managed bean :

    @PostConstruct
public void init() {
    Object principal = SecurityContextHolder.getContext().getAuthentication().getPrincipal();
    if (principal instanceof UserDetails) {
       login = ((UserDetails)principal).getUsername();
    } else {
       login = principal.toString();
    }

web xml :

         <listener>
        <listener-class>
            org.springframework.web.context.ContextLoaderListener
        </listener-class>
      </listener>
      <listener>
        <listener-class>
            org.springframework.web.context.request.RequestContextListener
        </listener-class>
      </listener>
        <!-- CONTEXT  -->
            <context-param>
                    <param-name>contextConfigLocation</param-name>
                    <param-value>/WEB-INF/ApplicationContext.xml , /WEB-INF/spring-security.xml</param-value>
      
            </context-param>   

   <filter>
        <filter-name>springSecurityFilterChain</filter-name>
        <filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>springSecurityFilterChain</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

Spring security xml :

  <http 
    authentication-manager-ref="jdbc-auth"
      use-expressions="true" >   
                      <intercept-url pattern="/loggedout.xhtml" access="permitAll" />     
            <intercept-url pattern="/login.xhtml" access="permitAll" />
            <intercept-url pattern="/denied.xhtml" access="isAuthenticated()" />             
            <intercept-url pattern="/member/**" access="isAuthenticated()" />
            <intercept-url pattern="/admin/**" access="Administrateur-portail" />  
               
             <form-login  login-page="/login.xhtml" login-processing-url="/j_spring_security_check"
              username-parameter="username" password-parameter="password" authentication-failure-url="/denied.xhtml" />
    <csrf disabled="true"/>

    </http>

why Spring security getPrincipal is giving NullPointer

0 Answers0