ldap authentication with tomcat

[Astrid Wagner]

Hi,

I am new to the subject:
How can I enforce ldap authentication for certain resources
using tomcat - similar to the

<Directory  toProtectResourcePath >
    Options FollowSymLinks
    AllowOverride None
    AuthType Basic
    AuthName "Authentication"
    AuthLDAPURL ldap://ldapUrl
    require valid-user
</Directory>

for apache in order to be able to get user information via
e.g. getRemoteUser() etc. ?

And by the way: Where is a valuable description of the configuration
with server.xml and web.xml?

Thanks.

Astrid