Improve exception messages in URLPermission

One of CAP member's customer receive the follow error after an update to Java
8u25 and 8u31 on a citrix terminal server. However, they have a problem to
reproduce it.

 CAP member ask if it is possible to improve the exception and add the
invalid actions strings to the exception?


Check the screenshot and error message with Java 1.8.25 und 1.8.31.

java.lang.IllegalArgumentException: invalid actions string
            at java.net.URLPermission.init(Unknown Source)
            at java.net.URLPermission.<init>(Unknown Source)
            at sun.net.www.protocol.http.HttpURLConnection.URLtoSocketPermission(Unknown Source)
            at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
            at com.sun.deploy.net.HttpUtils.followRedirects(Unknown Source)
            at com.sun.deploy.net.BasicHttpRequest.doRequest(Unknown Source)
            at com.sun.deploy.net.BasicHttpRequest.doGetRequestEX(Unknown Source)
            at com.sun.deploy.cache.ResourceProviderImpl.checkUpdateAvailable(Unknown Source)
            at com.sun.deploy.cache.ResourceProviderImpl.isUpdateAvailable(Unknown Source)
            at com.sun.deploy.cache.DeployCacheHandler.get(Unknown Source)
            at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(Unknown Source)
            at sun.net.www.protocol.http.HttpURLConnection$6.run(Unknown Source)
            at sun.net.www.protocol.http.HttpURLConnection$6.run(Unknown Source)
            at java.security.AccessController.doPrivileged(Native Method)
            at java.security.AccessController.doPrivileged(Unknown Source)
            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.getInputStream0(Unknown Source)
            at sun.net.www.protocol.http.HttpURLConnection.access$200(Unknown Source)
            at sun.net.www.protocol.http.HttpURLConnection$9.run(Unknown Source)
            at sun.net.www.protocol.http.HttpURLConnection$9.run(Unknown Source)
            at java.security.AccessController.doPrivileged(Native Method)
            at java.security.AccessController.doPrivileged(Unknown Source)
            at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
            at sun.security.provider.certpath.URICertStore.engineGetCRLs(Unknown Source)
            at java.security.cert.CertStore.getCRLs(Unknown Source)
            at sun.security.provider.certpath.DistributionPointFetcher.getCRL(Unknown Source)
            at sun.security.provider.certpath.DistributionPointFetcher.getCRLs(Unknown Source)
            at sun.security.provider.certpath.DistributionPointFetcher.getCRLs(Unknown Source)
            at sun.security.provider.certpath.DistributionPointFetcher.getCRLs(Unknown Source)
            at com.sun.deploy.security.RevocationChecker.checkCRLs(Unknown Source)
            at com.sun.deploy.security.RevocationChecker.check(Unknown Source)
            at com.sun.deploy.security.TrustDecider.checkRevocationStatus(Unknown Source)
            at com.sun.deploy.security.TrustDecider.getValidationState(Unknown Source)
            at com.sun.deploy.security.TrustDecider.validateChain(Unknown Source)
            at com.sun.deploy.security.TrustDecider.isAllPermissionGranted(Unknown Source)
            at sun.plugin2.applet.Plugin2ClassLoader.isTrustedByTrustDecider(Unknown Source)
            at sun.plugin2.applet.Plugin2ClassLoader.getTrustedCodeSources(Unknown Source)
            at com.sun.deploy.security.CPCallbackHandler$ParentCallback.strategy(Unknown Source)
            at
com.sun.deploy.security.CPCallbackHandler$ParentCallback.openClassPathElement(
Unknown Source)
            at
com.sun.deploy.security.DeployURLClassPath$JarLoader.getJarFile(Unknown
Source)
            at
com.sun.deploy.security.DeployURLClassPath$JarLoader.access$800(Unknown
Source)
            at
com.sun.deploy.security.DeployURLClassPath$JarLoader$1.run(Unknown Source)
            at java.security.AccessController.doPrivileged(Native Method)
            at
com.sun.deploy.security.DeployURLClassPath$JarLoader.ensureOpen(Unknown
Source)
            at
com.sun.deploy.security.DeployURLClassPath$JarLoader.<init>(Unknown Source)
            at com.sun.deploy.security.DeployURLClassPath$3.run(Unknown
Source)
            at java.security.AccessController.doPrivileged(Native Method)
            at com.sun.deploy.security.DeployURLClassPath.getLoader(Unknown
Source)
            at com.sun.deploy.security.DeployURLClassPath.getLoader(Unknown
Source)
            at com.sun.deploy.security.DeployURLClassPath.getResource(Unknown
Source)
            at sun.plugin2.applet.Plugin2ClassLoader$2.run(Unknown Source)
            at sun.plugin2.applet.Plugin2ClassLoader$2.run(Unknown Source)
            at java.security.AccessController.doPrivileged(Native Method)
            at sun.plugin2.applet.Plugin2ClassLoader.findClassHelper(Unknown
Source)
            at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown
Source)
            at sun.plugin2.applet.Plugin2ClassLoader.loadClass0(Unknown
Source)
            at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown
Source)
            at sun.plugin2.applet.Plugin2ClassLoader.loadClass0(Unknown
Source)
            at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown
Source)
            at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown
Source)
            at java.lang.ClassLoader.loadClass(Unknown Source)
            at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unknown Source)
            at sun.plugin2.applet.Plugin2Manager.initAppletAdapter(Unknown
Source)
            at
sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
            at java.lang.Thread.run(Unknown Source)