Submit Acesso negado

Programação Java
#1

Estou recebendo acesso negado nesso código

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<%@page language="java" contentType="text/html; charset=ISO-8859-1"
	pageEncoding="ISO-8859-1"%>
<html>
<head>
<title>adicionaProposta</title>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<meta name="GENERATOR" content="Rational Application Developer">
<link href="css/kit.css" rel="stylesheet" type="text/css">

<script type="text/javascript">
	
	
	
//trata botão de upload	
	function abrir() {   
                var arquivo = document.getElementById("file");   
                arquivo.click();  
               
    }   
               
    function atualizar(campoDe, idPara) {   
    	var fileName = document.getElementById(idPara);   
        fileName.value = campoDe.value;           
    }   
  
    function validarBrowser() {   
  		if(navigator.appName == "Netscape") {   
        	document.getElementById("fileText").style.display = "none";   
        	document.getElementById("fileOpener").style.display = "block";   
        	document.alert("ok");
        }   
    }  
    
    function setPaginas() {
		document.forms[0].pagAtual.value = 1;
		document.forms[0].pagFinal.value = "";
	}
			
	function consultaProposta() {
		//setPaginas();
		window.parent.navegacao.location.href = "mostraproposta.jsp";
		document.forms[0].action = "app?cmd=trataarquivo";  
		document.forms[0].submit();
	}    
    
    function adiciona(){
    	alert(document.getElementById("file").value);
    	//if(document.getElementById("file").value != ""){
    		consultaProposta();
    	//}
    }
	
</script>
	
</head>
<body topmargin="10" rightMargin="0">
	<form target="lista" method="post">
	<input type="hidden" name="cmd" value="">
		<table width="400" border="0" align="center" cellpadding="0" cellspacing="0">
			<tr>
				<td colspan="7">
					<table width="100%" border="0" cellspacing="0" cellpadding="0">
						<tr>
							<td width="2%" height="17" class="img-canto"></td>
							<td width="98%" height="17" class="title-cabeca">Consulta de Propostas para Cancelamento</td>
						</tr>
					</table>				
					<tr  class="cor-tabela">
						<td class="rotulos" align="center">Cod. Proposta</td>
						<td class="rotulos" align="center">Nº Proposta Seg.</td>
						<td></td>
						<td></td>
					</tr>
					<tr class="cor-tabela">
						<td align="center"><input type="text" action="" name="codigoProposta" size="10"></td>
						<td align="center"><input type="text" action="" name="numeroProposta" size="10"></td>
						
						<td align="center"><input type="button" class="botao80" value="adicionar" name="adicionar" id="adicionar" onclick="adiciona()"></td>
						<td align="center"><input type="button" class="botao80" value="upload" name="upload" onclick="abrir()"></td>
						
						<td align="center"><input type="file" id="file" name="uploadArquivo" accept="" style="display: none;"></td>
						<td align="center"></td>
											
						
						
					</tr>					
				</td>	
			</tr>
		</table>		
	</form>

</body>
</html>
#2