I have a multipart/form-data form. In the form i have a text file and a file element. When i enter - < these two characters in the text field n submit the form. It give the Exception as follows- javax.servlet.ServletException: MultipartIterator: invalid multipart request data, doesn't start with boundary I submit the form through a Java Script function. But if i submit the form directly , i mean by using the Submit button, it does not give me the Exception. I m not getting why the problem is occuring? What is the meaning of boundary? , how to set it and what is the solution for this. Please anyone let me know if u have the solution for this. THanks in advance.    More>>