https://bz.apache.org/bugzilla/show_bug.cgi?id=59423

            Bug ID: 59423
           Summary: amend "No LoginModules configured for ..."
           Product: Tomcat 8
           Version: 8.5.x-trunk
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: Catalina
          Assignee: dev@tomcat.apache.org
          Reporter: hau...@acm.org

After migrating to tomcat8, could no longer do client certificate login with
the following error

SEVERE: Unexpected error
javax.security.auth.login.LoginException: No LoginModules configured for
*yourServiceName*
        at javax.security.auth.login.LoginContext.init(LoginContext.java:264)
        at javax.security.auth.login.LoginContext.<init>(LoginContext.java:512)
        at org.apache.catalina.realm.JAASRealm.authenticate(JAASRealm.java:395)
        at org.apache.catalina.realm.JAASRealm.getPrincipal(JAASRealm.java:491)
        at
org.apache.catalina.realm.RealmBase.getPrincipal(RealmBase.java:1252)
        at org.apache.catalina.realm.RealmBase.authenticate(RealmBase.java:450)
        at
org.apache.catalina.authenticator.SSLAuthenticator.authenticate(SSLAuthenticator.java:110)
        at
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:581)

It turns out that while the entire service has 
clientAuth="true"

in the web.xml the url-pattern-based

<security-constraint>
...        <auth-constraint>
            <role-name>*</role-name>
        </auth-constraint>
    </security-constraint>
    <login-config>
        <auth-method>CLIENT-CERT</auth-method>
    </login-config>
...
war ignored in tomcat 7, with tomcat 8, it produced the above error.

==> suggestion: amend the LoginException with a hint on web.xml and
"login-config" element

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