Liferay doesn't catch form in portlet, and doesn't process

I have .jsp in liferay, and use javascript with applet, but after the form sent to the portlet, on the server side, portlet doesn't catch the form, and do not show in logs additional messages.

jsp page's snippet:

<script type="text/javascript">
    function processSigning(){
        var applet = document.applets["SignApplet"];
        var path_to_certificate = document.getElementById("certificate").value;
        var pass = document.getElementById("password").value;
        var filePath = document.getElementById("documentSign").value;
        applet.filePath = document.getElementById("documentSign").value;
        applet.profileTestPKCS12(path_to_certificate, pass);

        document.getElementById("file").value = applet.getDocumentString(filePath);
        document.getElementById("sign").value = applet.getSignString();
        document.getElementById("cert").value = applet.getCertificateString();


<form id="mainForm" action="<portlet:actionURL>
          <portlet:param name="COMMAND" value="LOAD"/>

    <hidden id="file" value="asdf"></hidden>
    <hidden id="cert" value="asdf"></hidden>
    <hidden id="sign" value="asdf"></hidden>
    <input type="button" onClick="processSigning();" value="click here!" >

portlets snippet:

public void processAction(ActionRequest request, ActionResponse response) throws PortletException {
    session = request.getPortletSession(true);
    String command = request.getParameter("COMMAND");
    System.out.println("command=" + command);"command=" + command);

if ("LOAD".equals(command)) {

String fileBase64 = request.getParameter("file");


Check your portlet.xml if the portlet-class is pointing to MVCPortlet or your custom portlet class. It should point to the custom portlet class.

Try this form and see if it works for you:

<portlet:actionURL var="myActionURL"></portlet:actionURL>

<form id="mainForm" action="${myActionURL}" method="post">
    <input type="hidden" name="COMMAND" id="COMMAND" value="LOAD" />
    <input type="hidden" name="file" id="file" value="asdf" />
    <input type="hidden" name="cert" id="cert" value="asdf" />
    <input type="hidden" name="sign" id="sign" value="asdf" />
    <input type="button" onClick="processSigning();" value="click here!" >

Hope this helps.

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