Used by the {@link Authorizer Authorizer} implementation methods to ensure that the {@link #setRealms realms}
has been set. The default implementation ensures the property is not null and not empty.
@throws IllegalStateException if the <tt>realms</tt> property is configured incorrectly.
Used by the {@link Authorizer Authorizer} implementation methods to ensure that the {@link #setRealms realms} has been set. The default implementation ensures the property is not null and not empty.
@throws IllegalStateException if the <tt>realms</tt> property is configured incorrectly.