enctype="multipart/form-data" is not supported to send simple text?

when i m using enctype="multipart/form-data" in jsp form the simple text,date,number are not send to servlet it show null values , when i remove enctype="multipart/form-data" then form work fine....why...how.....

my jsp code....

    <form method="post" action="<%=request.getContextPath()%>/ProfileServlet" enctype="multipart/form-data" >
                                                        <div class="form-group">
                                                            <label class="control-label">First Name</label>
                                                            <input type="text" placeholder="John" name="txtfname" class="form-control"/>
                                                        </div>
                                                        <div class="form-group">
                                                            <label class="control-label">Last Name</label>
                                                            <input type="text" placeholder="Doe" name="txtlname" class="form-control"/>
                                                        </div>
                                                        <div class="form-group">
                                                            <label class="control-label">Birth day</label>
                                                            <input type="date" placeholder="Doe" name="txtdate" class="form-control"/>
                                                        </div>

it show null values in servlet using enctype in jsp ,other wise it work fine.....