PIT Exception "JavaWebStartSecurity: couldn't find JNLPClassLoaderIf" coming during HTTPS tests exec

Exception "JavaWebStartSecurity: couldn't find JNLPClassLoaderIf" coming during HTTPS tests execution on all platforms. It is a regression, previos build 11 are fine
To reproduce:

- install jre1.6.0_10 (build 12 - pit build)
- run test:
http://nicole1.sfbay.sun.com:8080/JavawsMustangIntegTest/https/https_always.jnlp

Exception coming:

STATUS: HTTPS_ALWAYS START
Attempting to make connection to: https://nicole1.sfbay.sun.com:8443/
java.lang.Exception: JavaWebStartSecurity: couldn't find JNLPClassLoaderIf
        at com.sun.javaws.security.JavaWebStartSecurity.currentJNLPClassLoader(Unknown Source)
        at com.sun.javaws.security.JavaWebStartSecurity.checkAwtEventQueueAccess(Unknown Source)
        at java.awt.Toolkit.getSystemEventQueue(Unknown Source)
        at javax.swing.SystemEventQueueUtilities$SystemEventQueue.get(Unknown Source)
        at javax.swing.SystemEventQueueUtilities$SystemEventQueue.get(Unknown Source)
        at javax.swing.SystemEventQueueUtilities.addRunnableCanvas(Unknown Source)
        at javax.swing.JRootPane.addNotify(Unknown Source)
        at java.awt.Container.addNotify(Unknown Source)
        at java.awt.Window.addNotify(Unknown Source)
        at java.awt.Dialog.addNotify(Unknown Source)
        at java.awt.Window.pack(Unknown Source)
        at com.sun.deploy.ui.DialogTemplate.setSecurityContent(Unknown Source)
        at com.sun.deploy.ui.UIFactory$1.execute(Unknown Source)
        at com.sun.javaws.ui.JavawsSysRun$SecureThread.doWork(Unknown Source)
        at com.sun.javaws.ui.JavawsSysRun$SecureThread.run(Unknown Source)
Total line number: 152