JRE 1.7.0u21: access denied ("java.lang.RuntimePermission" "accessClassInPackage.com.sun.javafx.scene.control.skin")

[Tom Eugelink]

Since the release of 1.7.0u21 the Ensemble demo application that we're providing on the JFXtras website crashes with security exceptions. The first problem was that it is no longer is allowed to read system properties (not even user.home). So I've commented out all the accessing of the system properties as first quick patch, but it ain't getting any prettier, as the next exception shows:

SEVERE: javafx.scene.control.Control loadSkinClass Failed to load skin 'StringProperty [bean: CalendarPicker at 6573f3[styleClass=CalendarPicker], name: skinClassName, value: jfxtras.labs.internal.scene.control.skin.CalendarPickerControlSkin]' for control CalendarPicker at 6573f3[styleClass=CalendarPicker]
java.security.AccessControlException: *access denied ("java.lang.RuntimePermission" "accessClassInPackage.com.sun.javafx.scene.control.skin")*
     at java.security.AccessControlContext.checkPermission(Unknown Source)
     at java.security.AccessController.checkPermission(Unknown Source)
     at java.lang.SecurityManager.checkPermission(Unknown Source)
     at java.lang.SecurityManager.checkPackageAccess(Unknown Source)
     at sun.plugin2.applet.SecurityManagerHelper.checkPackageAccessHelper(Unknown Source)
     at sun.plugin2.applet.FXAppletSecurityManager.checkPackageAccess(Unknown Source)
     at java.lang.ClassLoader$1.run(Unknown Source)
     at java.lang.ClassLoader$1.run(Unknown Source)
     at java.security.AccessController.doPrivileged(Native Method)
     at java.lang.ClassLoader.checkPackageAccess(Unknown Source)
     at java.lang.ClassLoader.defineClass1(Native Method)
     at java.lang.ClassLoader.defineClass(Unknown Source)
     at java.security.SecureClassLoader.defineClass(Unknown Source)
     at java.net.URLClassLoader.defineClass(Unknown Source)
     at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
     at java.lang.reflect.Method.invoke(Unknown Source)
     at sun.plugin2.applet.Plugin2ClassLoader.defineClassHelper(Unknown Source)
     at sun.plugin2.applet.Plugin2ClassLoader.access$100(Unknown Source)
     at sun.plugin2.applet.Plugin2ClassLoader$2.run(Unknown Source)
     at java.security.AccessController.doPrivileged(Native Method)
     at sun.plugin2.applet.Plugin2ClassLoader.findClassHelper(Unknown Source)
     at sun.plugin2.applet.JNLP2ClassLoader.findClass(Unknown Source)
     at sun.plugin2.applet.Plugin2ClassLoader.loadClass0(Unknown Source)
     at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
     at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at java.lang.ClassLoader.defineClass1(Native Method)
     at java.lang.ClassLoader.defineClass(Unknown Source)
     at java.security.SecureClassLoader.defineClass(Unknown Source)
     at java.net.URLClassLoader.defineClass(Unknown Source)
     at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
     at java.lang.reflect.Method.invoke(Unknown Source)
     at sun.plugin2.applet.Plugin2ClassLoader.defineClassHelper(Unknown Source)
     at sun.plugin2.applet.Plugin2ClassLoader.access$100(Unknown Source)
     at sun.plugin2.applet.Plugin2ClassLoader$2.run(Unknown Source)
     at java.security.AccessController.doPrivileged(Native Method)
     at sun.plugin2.applet.Plugin2ClassLoader.findClassHelper(Unknown Source)
     at sun.plugin2.applet.JNLP2ClassLoader.findClass(Unknown Source)
     at sun.plugin2.applet.Plugin2ClassLoader.loadClass0(Unknown Source)
     at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
     at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at javafx.scene.control.Control.loadClass(Control.java:120)
     at javafx.scene.control.Control.loadSkinClass(Control.java:1021)
     at javafx.scene.control.Control.access$500(Control.java:70)
     at javafx.scene.control.Control$12.invalidated(Control.java:972)
     at javafx.beans.property.StringPropertyBase.markInvalid(StringPropertyBase.java:127)
     at javafx.beans.property.StringPropertyBase.set(StringPropertyBase.java:161)
     at com.sun.javafx.css.StyleableStringProperty.set(StyleableStringProperty.java:71)
     at javafx.scene.control.Control$12.set(Control.java:964)
     at com.sun.javafx.css.StyleableStringProperty.applyStyle(StyleableStringProperty.java:59)
     at com.sun.javafx.css.StyleableStringProperty.applyStyle(StyleableStringProperty.java:31)
     at com.sun.javafx.css.StyleableProperty.set(StyleableProperty.java:70)
     at com.sun.javafx.css.StyleHelper.transitionToState(StyleHelper.java:902)
     at javafx.scene.Node.impl_processCSS(Node.java:7415)
     at javafx.scene.Parent.impl_processCSS(Parent.java:1146)
     at javafx.scene.control.Control.impl_processCSS(Control.java:1154)
     at javafx.scene.Parent.impl_processCSS(Parent.java:1153)
     at javafx.scene.Parent.impl_processCSS(Parent.java:1153)
     at javafx.scene.Parent.impl_processCSS(Parent.java:1153)
     at javafx.scene.Parent.impl_processCSS(Parent.java:1153)
     at javafx.scene.Parent.impl_processCSS(Parent.java:1153)
     at javafx.scene.Parent.impl_processCSS(Parent.java:1153)
     at javafx.scene.Parent.impl_processCSS(Parent.java:1153)
     at javafx.scene.Parent.impl_processCSS(Parent.java:1153)
     at javafx.scene.control.Control.impl_processCSS(Control.java:1154)
     at javafx.scene.Parent.impl_processCSS(Parent.java:1153)
     at javafx.scene.Parent.impl_processCSS(Parent.java:1153)
     at javafx.scene.Parent.impl_processCSS(Parent.java:1153)
     at javafx.scene.control.Control.impl_processCSS(Control.java:1154)
     at javafx.scene.Node.processCSS(Node.java:7383)
     at javafx.scene.Node.processCSS(Node.java:7377)
     at javafx.scene.Node.processCSS(Node.java:7377)
     at javafx.scene.Node.processCSS(Node.java:7377)
     at javafx.scene.Node.processCSS(Node.java:7377)
     at javafx.scene.Node.processCSS(Node.java:7377)
     at javafx.scene.Node.processCSS(Node.java:7377)
     at javafx.scene.Node.processCSS(Node.java:7377)
     at javafx.scene.Scene.doCSSPass(Scene.java:446)
     at javafx.scene.Scene.access$3800(Scene.java:170)
     at javafx.scene.Scene$ScenePulseListener.pulse(Scene.java:2202)
     at com.sun.javafx.tk.Toolkit.firePulse(Toolkit.java:363)
     at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:460)
     at com.sun.javafx.tk.quantum.QuantumToolkit$9.run(QuantumToolkit.java:329)
     at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
     at com.sun.glass.ui.win.WinApplication.access$100(WinApplication.java:29)
     at com.sun.glass.ui.win.WinApplication$3$1.run(WinApplication.java:73)
     at java.lang.Thread.run(Unknown Source)

It's not allowed to read the Skin base clas...