Convert multiple securiy http configuration from xml to java configuration

Question

I have multiple security:http configurations in my xml with different entry-point-ref. I am trying to convert this config to java config.

I have read that this is possible using multiple sub classes extending WebSecurityConfigurerAdapter.

How should I configure the entry-point-ref for each of these in java config?

follwing is the xml config.

<security:http request-matcher-ref="preReqMatcher" auto-config="false" use-expressions="false" entry-point-    ref="preAuthenticatedProcessingFilterEntryPoint">
    <custom-filter position="PRE_AUTH_FILTER" ref="preAuthFilter" />
    <custom-filter after="CAS_FILTER" ref="attrFilter" />
    <intercept-url pattern="/**" access="ROLE_USER" />  
    <csrf disabled="true"/> 
</security:http> 

<security:http auto-config="true" entry-point-ref="casEntryPoint" use-expressions="false" disable-url-rewriting="false">
    <custom-filter position="CAS_FILTER" ref="casFilter" />
    <custom-filter after="CAS_FILTER" ref="attrFilter" />
    <intercept-url pattern="/**" access="ROLE_USER" />
    <custom-filter ref="testFilter" before="CAS_FILTER" />
    <csrf disabled="true"/>
</security:http>

Answer 1

Following is the way I figured out to configure the entry-point.

http.httpBasic().authenticationEntryPoint(preAuthenticatedProcessingFilterEntryPoint);