Custom Authentication is Broken

[alparslanavci]

When we try to use custom authentication with UsernamePasswordCredentials class, we can only configure it by using XML configuration as below:

<security> 
    <credentials>com.hazelcast.security.UsernamePasswordCredentials</credentials> 
    <login-credentials> 
        <username>User</username> 
        <password>usrPassword</password> 
    </login-credentials> 
</security>

It doesn't allow to configure programmatically since the UsernamePasswordCredentials is internal. It is a public class in Java client.