How come the form in the JSP page does not work if user hits "ENTER"

When I use the following code for loginpage.jsp
If the user hits ENTER on the keyboard it just displays the same form with nothing in the username box.
It works if the user clicks the button.
<HTML>
<BODY>
<%
String submit = request.getParameter("submit");
if(submit == null){
%>
<FORM METHOD=POST ACTION=loginpage.jsp>
Please enter your username: <INPUT TYPE=TEXT NAME=username SIZE=20>
<INPUT TYPE=SUBMIT NAME=submit VALUE='Go!'>
</FORM>
<%
else {
String user = request.getParameter("username");
if(user == null) {
// display same page
} else {
// foward to next page
%>
</BODY>
</HTML>

I adjusted my code but it still does nto work when hitting the ENTER keyboard button.
<HTML>
<BODY onload="document.form1.left.focus();">
<%
String submit = request.getParameter("submit");
if(submit == null){
%>
<FORM METHOD=POST ACTION=loginpage.jsp>
Please enter your username: <INPUT TYPE=TEXT NAME=username SIZE=20>
<INPUT TYPE="button" name="left" value="LEFT" onlick="alert(this.name)">
<INPUT TYPE="button" NAME="right" VALUE="RIGHT" onclick="alert(this.name)">
</FORM>
<%
else {
String user = request.getParameter("username");
if(user == null) {
// display same page
} else {
// foward to next page
%>
</BODY>
</HTML>
If I do this
<FORM METHOD=POST ACTION=nextpage.jsp>
And use ENTER keyboard button it works, but not when I have ACTION to teh same page.
Why is that?
Is this JSP related or HTML? I thought JSP had something to do with it since it's JSP file.

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Name Firefox
Version 33.0.1
Update History
User Agent Mozilla/5.0 (Windows NT 6.1; WOW64; rv:33.0) Gecko/20100101 Firefox/33.0
Profile Folder
Enabled Plugins about:plugins
Build Configuration about:buildconfig
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Crash Reports for the Last 3 Days
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