Debug output related to JGSS/Kerberos, including those for the JAAS `Krb5LoginModule`, the JGSS framework, and the Kerberos 5 and SPNEGO mechanisms (whether implemented in pure Java or through a native bridge), is now directed to the standard error output stream (`System.err`) instead of the standard output stream (`System.out`). Additionally, debug output is now prefixed with a category tag, such as `krb5loginmodule`, `jgss`, `krb5`, and others.