thank you for reply.

here is an example (if someone else has the same problem... )

client:

 try {

 System.setProperty("java.security.auth.login.config", "...pathtoauthconf\\auth.conf");
 org.jboss.security.auth.callback.UsernamePasswordHandler handler = new org.jboss.security.auth.callback.UsernamePasswordHandler(userid, password.toCharArray());
 final javax.security.auth.login.LoginContext lc = new javax.security.auth.login.LoginContext("testPolicy", handler);
 lc.login();
 }
 catch (Exception ex) {
 // login failed
 }

testPolicy {
 org.jboss.security.ClientLoginModule required;
 org.jboss.security.auth.spi.LdapLoginModule required
 java.naming.factory.initial="com.sun.jndi.ldap.LdapCtxFactory"
 java.naming.provider.url="ldap://localhost:389/"
 java.naming.security.authentication="simple";
 rolesCtxDN="ou=Roles,dc=eactAG,dc=ch"
 matchOnUserDN="true"
 principalDNSuffix=",ou=People,dc=eactAG,dc=ch"
 principalDNPrefix="uid="
 uidAttributeID="userid"
 roleAttributeID="roleName"
 roleAttributeIsDN="false"
};