Deal with mails with / without attachments

Question

My codes actually can save the image attachment of emails from email server. But, one problem I have is the codes don't work for mails with no attachment. How can solve this? I have added the structure of how I coded it. I am not sure if I can modify the 2nd part of the codes such that mails without attachment can work too. Pls advise. thank.
My code pattern is like this:
1st part : Connection.
2nd part:
if (contentType.startswith("image/")){
//get the image and save to folder and insert path to image table of database
if (contentType.startswith("text/plain")){
// insert image id and text to another table of database
3rd part: Delete email.

Answer 1

I don' have the demo folder currently. Any sample code that can be posted here?
I tried
if(disposition == null){
//do this for emails with no attachment
else if (disp.equalsIgnoreCase(Part.ATTACHMENT)){
//do this with attachments
else{
out.println("invalid");
But it still can't work. The (disp == null) seems to pass in all values for both emails with attachments or no attachments....Why??