Troubleshooting HelloKeytab.java

Common Exception Messages:

No CallbackHandler available to garner authentication

* Confirm that the keytab file exists
* Confirm principal is correct in login.conf file

No LoginModule configured for...

* Confirm that the LoginModule name between login.conf and HelloKeytab.java match.

Pre-authentication information was invalid (24)

* Check if miss-typed password or wrong password during creation of keytab.

Links:
pre-flight checklist
install guide - tomcat
install guide - jboss
install guide - glassfish
install guide - spring boot 2.x
install guide - spring boot 3.x
enable authZ with LDAP
get user group info from LDAP
reference docs
api docs
download

Troubleshooting:
HelloKDC.java
hello_spnego.jsp
HelloKeytab.java
hello_delegate.jsp
SpnegoHelloClient.java
ExampleSpnegoAuthenticatorValve.java

Examples:
create keytab for client
create keytab for app server
credential delegation
protected SOAP Web Service
tomcat authenticator valve
jboss authenticator valve
authZ for standalone apps
protecting edit button on page

Licensing:
GNU LGPL