jsp - LDAP Tomcat implementation -

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i need implement ladp + tomcat plan described here, have given index.jsp.

i believe user needs give username , password , these compared ldap username , password. me, if login successful, has go mainpage.jsp. normally, have action="\loginaction" , in struts-config.xml, mention success on page mainpage.jsp. here action different. how find mainpage.jsp?

also, i'm confused this:

j_username, j_password, action='<%= response.encodeurl("j_security_check") %>'


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