intermittent error: "An Authentication object was not found in the SecurityContext"

[supermoos]

I get this error "An Authentication object was not found in the SecurityContext".

I am logging in using BlazeDS with Spring integration and trying to leverage the Spring Security Framework, but no luck :-(

My security-config.xml looks like:

<?xml version="1.0" encoding="UTF-8"?>
<beans:beans xmlns="http://www.springframework.org/schema/security"
	xmlns:beans="http://www.springframework.org/schema/beans" 
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://www.springframework.org/schema/beans 
						http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
                        http://www.springframework.org/schema/security 
                        http://www.springframework.org/schema/security/spring-security-2.0.4.xsd">

	<beans:bean id="userDetailsService" class="org.springframework.security.userdetails.jdbc.JdbcDaoImpl">
  		<beans:property name="dataSource" ref="dataSource"/>
	</beans:bean>

	<http entry-point-ref="preAuthenticatedEntryPoint" session-fixation-protection="newSession" />
    
    <beans:bean id="preAuthenticatedEntryPoint" class="org.springframework.security.ui.preauth.PreAuthenticatedProcessingFilterEntryPoint" />

	<beans:bean id="preauthAuthProvider"
		class="org.springframework.security.providers.preauth.PreAuthenticatedAuthenticationProvider">
		<beans:property name="preAuthenticatedUserDetailsService">
			<beans:bean id="userDetailsServiceWrapper"
				class="org.springframework.security.userdetails.UserDetailsByNameServiceWrapper">
				<beans:property name="userDetailsService"
					ref="userDetailsService" />
			</beans:bean>
		</beans:property>
	</beans:bean>

	<beans:bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
	  <beans:property name="driverClassName" value="com.mysql.jdbc.Driver"/>
	  <beans:property name="url" value="jdbc:mysql://localhost/consultant_db"/>
	  <beans:property name="username" value="XXXXXXX"/>
	  <beans:property name="password" value="XXXXXXX"/>
	</beans:bean>
	
	<authentication-provider>
		<jdbc-user-service data-source-ref="dataSource" />
	</authentication-provider>
</beans:beans>

And my application-config.xml:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
		xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
		xmlns:flex="http://www.springframework.org/schema/flex" 
		xmlns:security="http://www.springframework.org/schema/security"
		xsi:schemaLocation="http://www.springframework.org/schema/beans 
			http://www.springframework.org/schema/beans/spring-beans-2.5.xsd 
			http://www.springframework.org/schema/flex 
			http://www.springframework.org/schema/flex/spring-flex-1.0.xsd
			http://www.springframework.org/schema/security
			http://www.springframework.org/schema/security/spring-security-2.0.4.xsd">
			
	<!-- Simplest possible message broker -->
	<flex:message-broker>
		<flex:secured />
	</flex:message-broker>

	<!-- Spring Beans’s --> 
	<bean id="myService" class="MyServiceImpl">
		<flex:remoting-destination/>
		<security:intercept-methods>
			<security:protect method="getMyEntities" access="ROLE_USER" />
		</security:intercept-methods>
	</bean>
</beans>

In the FAQ for spring (http://static.springsource.org/sprin...ials-not-found) I read that this error can be ignored, or possibly fixed using AnonymousProcessingFilter, but how?

I cannot login when I get this error, no matter how many times I try it always gives this error - but only once it has been thrown once. Sometimes it works after a little while of inactivity?