CachedFileLoader fails to save the downloaded resource. It seems to have racing condition, since it breaks in different places for the same test.

java.io.IOException: The handle is invalid
    at java.io.RandomAccessFile.seek(Native Method)
    at sun.plugin.cache.CachedFileLoader.createCacheFiles(CachedFileLoader.java:403)
    at sun.plugin.cache.CachedFileLoader.access$200(CachedFileLoader.java:34)
    at sun.plugin.cache.CachedFileLoader$3.run(CachedFileLoader.java:293)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.plugin.cache.CachedFileLoader.download(CachedFileLoader.java:291)
    at sun.plugin.cache.CachedFileLoader.load(CachedFileLoader.java:103)
    at sun.plugin.cache.FileCache.get(FileCache.java:136)
    at sun.plugin.cache.PluginCacheHandler.get(PluginCacheHandler.java:87)
    at sun.net.www.protocol.http.HttpURLConnection.plainConnect(Unknown Source)
    at sun.net.www.protocol.http.HttpURLConnection.connect(Unknown Source)
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
    at java.net.HttpURLConnection.getResponseCode(Unknown Source)
    at sun.applet.AppletClassLoader.getBytes(Unknown Source)
    at sun.applet.AppletClassLoader.access$100(Unknown Source)
    at sun.applet.AppletClassLoader$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.applet.AppletClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.applet.AppletClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClassInternal(Unknown Source)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Unknown Source)
    at VerifierTest.testVerifierHack(VerifierTest.java:36)
    at VerifierTest.test(VerifierTest.java:48)
    at SecurityTest.paint(SecurityTest.java:63)
    at SecurityTestApplet.paint(SecurityTestApplet.java:98)
    at java.awt.Container.update(Unknown Source)
    at sun.awt.RepaintArea.updateComponent(Unknown Source)
    at sun.awt.RepaintArea.paint(Unknown Source)
    at sun.awt.windows.WComponentPeer.handleEvent(Unknown Source)
    at java.awt.Component.dispatchEventImpl(Unknown Source)
    at java.awt.Container.dispatchEventImpl(Unknown Source)
    at java.awt.Component.dispatchEvent(Unknown Source)
    at java.awt.EventQueue.dispatchEvent(Unknown Source)
    at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source)