I got an OperationNotSupportedException when I tried to create a subcontext. Of course the subcontext I asked for had a bad name; the name was "george" and, not having an equal sign in it, would never pass LDAP rules.

> com.sun.java.naming.OperationNotSupportedException; Remaining Name: 'george'

This exception means that what you tried to do is unsupported; the implication is that creation of a subcontext is unsupported in this situation.

Unfortunately there was no indication that this was not the case. This can be very misleading.