Symfony 1.4:index.php上的Applet问题(在frontend_dev上工作)

I have an own Authentication module which is registered in the settings.yml:

.actions:
  login_module:           auth
  login_action:           index

At indexSuccess in the module auth I have an applet in which I use Java Native Access to have access to dill-libraries. The applet is signed. This is indexSucces:

<?php if ($showApplet): ?>
  <applet code="attribute.class" codebase="/applet/" archive="/applet/attribute.jar, /applet/jna-4.0.0.jar" width="1" height="1">
  <param name="url" value="<?php echo $url ?>" />
</applet>
<?php else: ?>
  <?php include_partial('form', array('form' => $form)) ?>
<?php endif ?>

When I call my project using frontend_dev everything works fine. But when I try to call it using index.php it doesn't work (500 Internal Server Error). Is it because of safety restrictions? If so how could I get it working? Or does this problem have other reasons?

Have you tried to clear the cache ? When an issue happens on prod environment (index.php) but doesn't in dev environment (frontend_dev.php), it is often due to cache.

Just php symfony clear cache in command line when you are in your project root, or just erase the cache folder's content