Sometimes this ClassCastException is thrown while running JUnit tests on jdk8u-cpu.
Sometimes it appears during manual testing of JNLP applets although it is not 100% reproducible (in most cases applet run but 2 or 3 times I got this exception thrown).


network: Connecting http://ocsp.thawte.com/ with proxy=HTTP @ www-proxy.us.oracle.com/148.87.19.20:80
basic: exception: User has denied the privileges to the code.
com.sun.deploy.security.BlockedException: User has denied the privileges to the code
at sun.plugin2.applet.Plugin2ClassLoader.getTrustedCodeSources(Plugin2ClassLoader.java:1239)
at com.sun.deploy.security.CPCallbackHandler$ParentCallback.strategy(CPCallbackHandler.java:232)
at com.sun.deploy.security.CPCallbackHandler$ParentCallback.openClassPathElement(CPCallbackHandler.java:195)
at com.sun.deploy.security.DeployURLClassPath$JarLoader.getJarFile(DeployURLClassPath.java:823)
at com.sun.deploy.security.DeployURLClassPath$JarLoader.access$1000(DeployURLClassPath.java:727)
at com.sun.deploy.security.DeployURLClassPath$JarLoader$1.run(DeployURLClassPath.java:764)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.deploy.security.DeployURLClassPath$JarLoader.ensureOpen(DeployURLClassPath.java:758)
at com.sun.deploy.security.DeployURLClassPath$JarLoader.<init>(DeployURLClassPath.java:747)
at com.sun.deploy.security.DeployURLClassPath$3.run(DeployURLClassPath.java:432)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.deploy.security.DeployURLClassPath.getLoader(DeployURLClassPath.java:422)
at com.sun.deploy.security.DeployURLClassPath.getLoader(DeployURLClassPath.java:396)
at com.sun.deploy.security.DeployURLClassPath.getResource(DeployURLClassPath.java:254)
at sun.plugin2.applet.Plugin2ClassLoader$1.run(Plugin2ClassLoader.java:1085)
at java.security.AccessController.doPrivileged(Native Method)
at sun.plugin2.applet.Plugin2ClassLoader.findClassHelper(Plugin2ClassLoader.java:1075)
at sun.plugin2.applet.Applet2ClassLoader.findClass(Applet2ClassLoader.java:158)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass0(Plugin2ClassLoader.java:273)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Plugin2ClassLoader.java:203)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass0(Plugin2ClassLoader.java:263)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Plugin2ClassLoader.java:203)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Plugin2ClassLoader.java:184)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Plugin2ClassLoader.java:838)
at sun.plugin2.applet.Plugin2Manager.initAppletAdapter(Plugin2Manager.java:2506)
at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Plugin2Manager.java:1628)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ClassCastException: com.sun.deploy.security.X509CertificateWrapper cannot be cast to sun.security.x509.X509CertImpl
at sun.security.provider.certpath.OCSPResponse.verify(Unknown Source)
at sun.security.provider.certpath.OCSP.check(Unknown Source)
at sun.security.provider.certpath.OCSP.check(Unknown Source)
at sun.security.provider.certpath.OCSP.check(Unknown Source)
at com.sun.deploy.security.RevocationChecker.checkOCSP(RevocationChecker.java:193)
at com.sun.deploy.security.RevocationChecker.check(RevocationChecker.java:142)
at com.sun.deploy.security.TrustDecider.checkRevocationStatus(TrustDecider.java:668)
at com.sun.deploy.security.TrustDecider.getValidationState(TrustDecider.java:510)
at com.sun.deploy.security.TrustDecider.validateChain(TrustDecider.java:338)
at com.sun.deploy.security.TrustDecider.isAllPermissionGranted(TrustDecider.java:987)
at sun.plugin2.applet.Plugin2ClassLoader.isTrustedByTrustDecider(Plugin2ClassLoader.java:596)
at sun.plugin2.applet.Plugin2ClassLoader.getTrustedCodeSources(Plugin2ClassLoader.java:1232)
... 27 more