Reporting a bug on NtlmPasswordAuthentication when using Android

Hello,
I hope this is the right way to report a bug, if not my apologies.
The problem is related with the implementation of the string.indexOf('@') method on Android API.

In the function NtlmPasswordAuthentication in the jcifs.smb.NtlmPasswordAuthentication.java class. when creating and authentication without the username or password ( = null) then the indexOf was generating the NullPointerException.
To solve the following issue i included a simple check on the username against null.

If im not mistaking this is needed when a GUEST connection is needed to the server.

/**
 * Create an <tt>NtlmPasswordAuthentication</tt> object from a
 * domain, username, and password. Parameters that are <tt>null</tt>
 * will be substituted with <tt>jcifs.smb.client.domain</tt>,
 * <tt>jcifs.smb.client.username</tt>, <tt>jcifs.smb.client.password</tt>
 * property values.
 */
    public NtlmPasswordAuthentication( String domain, String username, String password ) {
        int ci;

        if(username != null){
        	ci = username.indexOf('@');
        	if (ci > 0) {
        		domain = username.substring(ci + 1);
        		username = username.substring(0, ci);
        	} else {
        		ci = username.indexOf('\\');
        		if (ci > 0) {
        			domain = username.substring(0, ci);
        			username = username.substring(ci + 1);
        		}
        	}
        }
        	
        this.domain = domain;
        this.username = username;
        this.password = password;

        initDefaults();

        if( domain == null ) this.domain = DEFAULT_DOMAIN;
        if( username == null ) this.username = DEFAULT_USERNAME;
        if( password == null ) this.password = DEFAULT_PASSWORD;
    }

--Paulo Louro