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Signed applet issues

I am developing an application that will only perform encryption / decryption on the client side. I am using Spring, jdk 1.6+ and eclipse. I developed an applet that contains cryptographic code that looks like this:

public void accessToken(){
        try{
            File tmpConfigFile = File.createTempFile("pkcs11", "conf");
            tmpConfigFile.deleteOnExit();
            PrintWriter configWriter = new PrintWriter(new FileOutputStream(tmpConfigFile), true);
            configWriter.println("name=eToken");
            configWriter.println("library=" + "C:\\WINDOWS\\system32\\eTPKCS11.dll");
            configWriter.println("slotListIndex=0");
            configWriter.println("showInfo=true");

            this.pkcs11Provider = new SunPKCS11(tmpConfigFile.getAbsolutePath());
            Security.addProvider(this.pkcs11Provider);

            CallbackHandler cbh = new DialogCallbackHandler();
            KeyStore.Builder ksBuilder = KeyStore.Builder.newInstance("PKCS11", null, new KeyStore.CallbackHandlerProtection(cbh));                     
            KeyStore ks = ksBuilder.getKeyStore();
            ks.load(null, null);            
        }catch(Exception e){
            e.printStackTrace();
        }
    }

I created a jar file and signed it, it works well when I run it as “run on Java Applet” on the local computer from eclipse, and it works fine and asks for the password when the page loads, when I open the html page that includes this applet, but when I click on the checkbox that calls the accessToken () applet method, it gives an error in the java console, for example:

java.lang.SecurityException: Unable to create temporary file
    at java.io.File.checkAndCreate(Unknown Source)
    at java.io.File.createTempFile(Unknown Source)
    at java.io.File.createTempFile(Unknown Source)
    at message.MessageApplet.accessToken(MessageApplet.java:49)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at sun.plugin.javascript.JSInvoke.invoke(Unknown Source)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at sun.plugin.javascript.JSClassLoader.invoke(Unknown Source)
    at sun.plugin2.liveconnect.JavaClass$MethodInfo.invoke(Unknown Source)
    at sun.plugin2.liveconnect.JavaClass$MemberBundle.invoke(Unknown Source)
    at sun.plugin2.liveconnect.JavaClass.invoke0(Unknown Source)
    at sun.plugin2.liveconnect.JavaClass.invoke(Unknown Source)
    at sun.plugin2.main.client.LiveConnectSupport$PerAppletInfo$DefaultInvocationDelegate.invoke(Unknown Source)
    at sun.plugin2.main.client.LiveConnectSupport$PerAppletInfo$3.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.plugin2.main.client.LiveConnectSupport$PerAppletInfo.doObjectOp(Unknown Source)
    at sun.plugin2.main.client.LiveConnectSupport$PerAppletInfo$LiveConnectWorker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)

and my html page looks like this:

<SCRIPT LANGUAGE="JavaScript">
            function selectedCity() 
            {
                var elem = document.getElementById('cityRb');

                if(elem.checked)
                {
                    document.messageApplet.accessToken();
                }      
            }
        </SCRIPT></HEAD>
    <BODY >
        <b>This is the Applet</b>
     <script src="http://www.java.com/js/deployJava.js"></script>
    <script>
        <!-- applet id can be used to get a reference to the applet object -->
        var attributes = { id:'messageApplet', code:'message.MessageApplet',  width:1, height:1} ;
        var parameters = {jnlp_href: 'message-applet.jnlp'} ;
        deployJava.runApplet(attributes, parameters, '1.6');
    </script>

    <FORM NAME="CityChoice">
        <input type="radio" id="cityRb" name="City" value="Boston" onClick="selectedCity()"> Boston<br>
    </form>
</BODY >

and my JNLP file looks like this:

<jnlp spec="1.0+" codebase="" href="">
    <information>
        <title>Message Applet</title>
        <vendor>Fountainhead</vendor>
    <offline-allowed/>
    </information>
<update check="background"/>
    <security>
    <all-permissions/>
    </security>
    <resources>
        <!-- Application Resources -->
    <j2se version="1.6+"
              href="http://java.sun.com/products/autodl/j2se"/>
        <jar href="message.jar" main="true" />

    </resources>
    <applet-desc 
         name="Message Applet"
         main-class="message.MessageApplet"
         width="300"
         height="300">
     </applet-desc>
     <update check="background"/>
</jnlp>

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final File myFile = (File) AccessController.doPrivileged(new PrivilegedAction() {
                public Object run(){
                    String fileName = System.getProperty("user.home") +
                      System.getProperty("file.separator") +
                      "pkcs11.conf";                    
                    return new File(fileName);
                }});

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