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FULL PRODUCT VERSION : All JRE 1.7 (from JRE 1.7.0_01 to JRE 1.7.0_05) ADDITIONAL OS VERSION INFORMATION : Microsoft Windows [version 6.1.7600] Windows 7 64 bits EXTRA RELEVANT SYSTEM CONFIGURATION : All JRE 1.7 (from JRE 1.7.0_01 to JRE 1.7.0_05) Tomcat 6.0.32 (I also tried with Apache and Glassfish) Local network A DESCRIPTION OF THE PROBLEM : In Windows 7 64 bits, with a JRE 1.7, from any browser (Firefox, Internet Explorer 9 at 32 and at 64 bit, Chrome), when we try to run an applet hosted on an http server on a local network, the download of jars starts, but never ends. Via the internet it downloads but not via a local network. For exemple, we tried the applet at "http://java.com/en/download/testjava.jsp", it works. But when we put this applet (TestVM2-test.jar) on a Tomcat under a local network, the applet doesn't load. I spent some time on this issue and found the following : The problem is the communication with IPv6 : if we add the parameter "-Djava.net.preferIPv4Stack=true" to the JRE, the applets do load. I think that in Windows 7 64 bits : - with JRE 1.6, the communication is in IPv4, - with JRE 1.7, via the internet, the communication is in IPv4, - but with JRE 1.7, in a local network the communication is in IPv6 and there is a problem in the java code of the JRE which makes that in this case the applets don't load. I searched in the java code of rt.jar and found the following : In the class java.net.PlainSocketImpl, the parameter preferIPv4Stack is read and if it is true, we use a java.net.TwoStacksPlainSocketImpl object, but if it is false we use a java.net.DualStackPlainSocketImpl that handles both IPv4 and IPV6 through a single file descriptor. May be the problem is here ? REGRESSION. Last worked in version 6u31 STEPS TO FOLLOW TO REPRODUCE THE PROBLEM : Windows 7 64 bits, JRE 1.7.x Take any applet (for exemple the applet that is on http://java.com/en/download/testjava.jsp) and put it on a Tomcat or Apache on your machine with an html page to acces it. Open IE 9 and acces the html page (exemple http://localhost/TestJava/), your applet won't load. EXPECTED VERSUS ACTUAL BEHAVIOR : EXPECTED - The applet should load and display in IE. ACTUAL - The applet does not load. ERROR MESSAGES/STACK TRACES THAT OCCUR : Here is the trace in the java console : Plug-in Java 10.4.0.22 Utilisation de la version JRE 1.7.0_04-b22 Java HotSpot(TM) Client VM R��pertoire d'origine de l'utilisateur = C:\Users\mounir ---------------------------------------------------- c: effacer la fen��tre de la console f: finaliser les objets de la file d'attente de finalisation g: nettoyer la m��moire h: afficher ce message d'aide l: vider la liste des chargeurs de classes m: imprimer le relev�� d'utilisation de la m��moire o: d��clencher la journalisation q: masquer la console r: recharger la configuration des r��gles s: vider les propri��t��s syst��me et de d��ploiement t: vider la liste des threads v: vider la pile des threads x: effacer le cache de chargeurs de classes 0-5: fixer le niveau de trace �� <n> ---------------------------------------------------- security: property package.access value sun.,com.sun.xml.internal.ws.,com.sun.xml.internal.bind.,com.sun.imageio.,com.sun.org.apache.xerces.internal.utils.,com.sun.org.apache.xalan.internal.utils. security: property package.access new value sun.,com.sun.xml.internal.ws.,com.sun.xml.internal.bind.,com.sun.imageio.,com.sun.org.apache.xerces.internal.utils.,com.sun.org.apache.xalan.internal.utils.,com.sun.javaws security: property package.access value sun.,com.sun.xml.internal.ws.,com.sun.xml.internal.bind.,com.sun.imageio.,com.sun.org.apache.xerces.internal.utils.,com.sun.org.apache.xalan.internal.utils.,com.sun.javaws security: property package.access new value sun.,com.sun.xml.internal.ws.,com.sun.xml.internal.bind.,com.sun.imageio.,com.sun.org.apache.xerces.internal.utils.,com.sun.org.apache.xalan.internal.utils.,com.sun.javaws,com.sun.deploy security: property package.access value sun.,com.sun.xml.internal.ws.,com.sun.xml.internal.bind.,com.sun.imageio.,com.sun.org.apache.xerces.internal.utils.,com.sun.org.apache.xalan.internal.utils.,com.sun.javaws,com.sun.deploy security: property package.access new value sun.,com.sun.xml.internal.ws.,com.sun.xml.internal.bind.,com.sun.imageio.,com.sun.org.apache.xerces.internal.utils.,com.sun.org.apache.xalan.internal.utils.,com.sun.javaws,com.sun.deploy,com.sun.jnlp security: property package.definition value null security: property package.definition new value com.sun.javaws security: property package.definition value com.sun.javaws security: property package.definition new value com.sun.javaws,com.sun.deploy security: property package.definition value com.sun.javaws,com.sun.deploy security: property package.definition new value com.sun.javaws,com.sun.deploy,com.sun.jnlp security: property package.access value sun.,com.sun.xml.internal.ws.,com.sun.xml.internal.bind.,com.sun.imageio.,com.sun.org.apache.xerces.internal.utils.,com.sun.org.apache.xalan.internal.utils.,com.sun.javaws,com.sun.deploy,com.sun.jnlp security: property package.access new value sun.,com.sun.xml.internal.ws.,com.sun.xml.internal.bind.,com.sun.imageio.,com.sun.org.apache.xerces.internal.utils.,com.sun.org.apache.xalan.internal.utils.,com.sun.javaws,com.sun.deploy,com.sun.jnlp,org.mozilla.jss security: property package.definition value com.sun.javaws,com.sun.deploy,com.sun.jnlp security: property package.definition new value com.sun.javaws,com.sun.deploy,com.sun.jnlp,org.mozilla.jss preloader: Construct preloader delegate preloader: Setting default preloader and progress monitor for non JNLP applets basic: Processus d'��coute de progression ajout�� : sun.plugin.util.ProgressMonitorAdapter@1176e5c preloader: Installing progress monitor true preloader: Using preloader class: null com.sun.deploy.uitoolkit.impl.awt.AWTAppletAdapter@1a1472d preloader: Using default preloader preloader: Requested to use preloader class: null basic: Plugin2ClassLoader.addURL parent called for http://192.168.0.185/TestJava/applet/TestVM2-test.jar preloader: Skipped all (0) download events prior to null preloader: GrayBox: parent = sun.plugin2.main.client.PluginEmbeddedFrame[frame0,0,0,500x335,layout=java.awt.BorderLayout,title=,resizable,normal] preloader: Delivering: AppletInitEvent[type=CallConstructor] preloader: Start progressCheck thread network: Entr��e de cache introuvable [URL��: http://192.168.0.185/TestJava/applet/TestVM2-test.jar, version��: null] network: Connexion de http://192.168.0.185/TestJava/applet/TestVM2-test.jar avec proxy=DIRECT network: Connexion de http://192.168.0.185:80/ avec proxy=DIRECT preloader: Stop progressCheck thread And after a while : java.net.SocketException: Connection reset at java.net.SocketInputStream.read(Unknown Source) at java.net.SocketInputStream.read(Unknown Source) at java.io.BufferedInputStream.fill(Unknown Source) at java.io.BufferedInputStream.read1(Unknown Source) at java.io.BufferedInputStream.read(Unknown Source) at sun.net.www.MeteredStream.read(Unknown Source) at java.io.FilterInputStream.read(Unknown Source) at sun.net.www.protocol.http.HttpURLConnection$HttpInputStream.read(Unknown Source) at sun.net.www.protocol.http.HttpURLConnection$HttpInputStream.read(Unknown Source) at sun.net.www.protocol.http.HttpURLConnection$HttpInputStream.read(Unknown Source) at sun.net.www.protocol.http.HttpURLConnection$HttpInputStream.close(Unknown Source) at java.io.BufferedInputStream.close(Unknown Source) at sun.plugin.PluginURLJarFileCallBack.downloadJAR(Unknown Source) at sun.plugin.PluginURLJarFileCallBack.access$000(Unknown Source) at sun.plugin.PluginURLJarFileCallBack$1.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at sun.plugin.PluginURLJarFileCallBack.retrieve(Unknown Source) at sun.net.www.protocol.jar.URLJarFile.retrieve(Unknown Source) at sun.net.www.protocol.jar.URLJarFile.getJarFile(Unknown Source) at sun.net.www.protocol.jar.JarFileFactory.get(Unknown Source) at sun.net.www.protocol.jar.JarURLConnection.connect(Unknown Source) at sun.plugin.net.protocol.jar.CachedJarURLConnection.connect(Unknown Source) at sun.plugin.net.protocol.jar.CachedJarURLConnection.getJarFileInternal(Unknown Source) at sun.plugin.net.protocol.jar.CachedJarURLConnection.getJarFile(Unknown Source) at com.sun.deploy.security.DeployURLClassPath$JarLoader.getJarFile(Unknown Source) at com.sun.deploy.security.DeployURLClassPath$JarLoader.access$1000(Unknown Source) at com.sun.deploy.security.DeployURLClassPath$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$2.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at sun.plugin2.applet.Plugin2ClassLoader.findClassHelper(Unknown Source) at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source) at sun.plugin2.applet.Plugin2ClassLoader.loadClass0(Unknown Source) at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source) at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unknown Source) at sun.plugin2.applet.Plugin2Manager.initAppletAdapter(Unknown Source) at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source) at java.lang.Thread.run(Unknown Source) network: Entr��e de cache introuvable [URL��: http://localhost/TestJava/applet/TestVM2-test.jar, version��: null] network: Connexion de http://localhost/TestJava/applet/TestVM2-test.jar avec proxy=DIRECT network: Connexion de http://localhost:80/ avec proxy=DIRECT Then a message box with an exception : java.lang.ClassNotFoundException: testJava2_1.TestVMApplet 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.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$AppletExecutionRunnable.run(Unknown Source) at java.lang.Thread.run(Unknown Source) I made a full thread dump and here is where the applet download blocks : "thread applet-testJava2_1/TestVMApplet-1" prio=4 tid=0x06810800 nid=0x19f8 runnable [0x0805d000] java.lang.Thread.State: RUNNABLE at java.net.SocketInputStream.socketRead0(Native Method) at java.net.SocketInputStream.read(Unknown Source) at java.net.SocketInputStream.read(Unknown Source) at java.io.BufferedInputStream.read1(Unknown Source) at java.io.BufferedInputStream.read(Unknown Source) - locked <0x29b8dd60> (a java.io.BufferedInputStream) at sun.net.www.MeteredStream.read(Unknown Source) - locked <0x29b8dd80> (a sun.net.www.http.KeepAliveStream) at java.io.FilterInputStream.read(Unknown Source) at sun.net.www.protocol.http.HttpURLConnection$HttpInputStream.read(Unknown Source) at java.io.BufferedInputStream.read1(Unknown Source) at java.io.BufferedInputStream.read(Unknown Source) - locked <0x29b8dde0> (a java.io.BufferedInputStream) at java.io.FilterInputStream.read(Unknown Source) at sun.plugin.PluginURLJarFileCallBack.downloadJAR(Unknown Source) at sun.plugin.PluginURLJarFileCallBack.access$000(Unknown Source) at sun.plugin.PluginURLJarFileCallBack$1.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at sun.plugin.PluginURLJarFileCallBack.retrieve(Unknown Source) at sun.net.www.protocol.jar.URLJarFile.retrieve(Unknown Source) at sun.net.www.protocol.jar.URLJarFile.getJarFile(Unknown Source) at sun.net.www.protocol.jar.JarFileFactory.get(Unknown Source) at sun.net.www.protocol.jar.JarURLConnection.connect(Unknown Source) at sun.plugin.net.protocol.jar.CachedJarURLConnection.connect(Unknown Source) at sun.plugin.net.protocol.jar.CachedJarURLConnection.getJarFileInternal(Unknown Source) - locked <0x29b8df48> (a sun.plugin.net.protocol.jar.CachedJarURLConnection) at sun.plugin.net.protocol.jar.CachedJarURLConnection.getJarFile(Unknown Source) - locked <0x29b8df48> (a sun.plugin.net.protocol.jar.CachedJarURLConnection) at com.sun.deploy.security.DeployURLClassPath$JarLoader.getJarFile(Unknown Source) at com.sun.deploy.security.DeployURLClassPath$JarLoader.access$1000(Unknown Source) at com.sun.deploy.security.DeployURLClassPath$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) - locked <0x29a35830> (a com.sun.deploy.security.DeployURLClassPath) at com.sun.deploy.security.DeployURLClassPath.getResource(Unknown Source) at sun.plugin2.applet.Plugin2ClassLoader$2.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at sun.plugin2.applet.Plugin2ClassLoader.findClassHelper(Unknown Source) at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source) at sun.plugin2.applet.Plugin2ClassLoader.loadClass0(Unknown Source) at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source) - locked <0x29a35870> (a sun.plugin2.applet.Applet2ClassLoader) at sun.plugin2.applet.Plugin2ClassLoader.loadClass0(Unknown Source) at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source) - locked <0x29a35910> (a sun.plugin2.applet.Applet2ClassLoader) at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source) - locked <0x29a35910> (a sun.plugin2.applet.Applet2ClassLoader) at java.lang.ClassLoader.loadClass(Unknown Source) at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unknown Source) at sun.plugin2.applet.Plugin2Manager.initAppletAdapter(Unknown Source) at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source) at java.lang.Thread.run(Unknown Source) REPRODUCIBILITY : This bug can be reproduced always. CUSTOMER SUBMITTED WORKAROUND : If we add the parameter "-Djava.net.preferIPv4Stack=true" to the JRE, the applets do load.