workaround to Principals

PlainRolePrincipal.java

import java.security.Principal;

public class PlainRolePrincipal implements Principal {

	String roleName;
	
	public PlainRolePrincipal(String name) {
		roleName = name;
	}
	public String getName() {
		return roleName;
	}
	
    public String toString() {
        return ("RolePrincipal: " + roleName);
    }

    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj instanceof PlainRolePrincipal) {
        	PlainRolePrincipal other = (PlainRolePrincipal) obj;
            return roleName.equals(other.roleName);
        }
        return false;
    }

    public int hashCode() {
        return roleName.hashCode();
    }
}