在某次更新后, 偶的Debian Sid就无法正常显示 java applet的内容, 因为使用applet的机会并不多, 所以一直没有在意, 前几天打算调一下EMC的存储, 竟然收到了同样的报错, 从Java控制台收到的错误内容如下:

载入：找不到类 com.emc.navisphere.gui.jnfx.JNfxMain.class。 java.lang.ClassNotFoundException: com.emc.navisphere.gui.jnfx.JNfxMain.class         at sun.plugin2.applet.Applet2ClassLoader.findClass(Applet2ClassLoader.java:152)         at java.lang.ClassLoader.loadClass(ClassLoader.java:303)         at java.lang.ClassLoader.loadClass(ClassLoader.java:248)         at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Plugin2ClassLoader.java:447)         at sun.plugin2.applet.Plugin2Manager.createApplet(Plugin2Manager.java:2880)         at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Plugin2Manager.java:1397)         at java.lang.Thread.run(Thread.java:619) Caused by: java.net.ConnectException: Network is unreachable         at java.net.PlainSocketImpl.socketConnect(Native Method)         at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:333)         at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:195)         at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:182)         at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)         at java.net.Socket.connect(Socket.java:525)         at sun.net.NetworkClient.doConnect(NetworkClient.java:161)         at sun.net.www.http.HttpClient.openServer(HttpClient.java:394)         at sun.net.www.http.HttpClient.openServer(HttpClient.java:529)         at sun.net.www.http.HttpClient.<init>(HttpClient.java:233)         at sun.net.www.http.HttpClient.New(HttpClient.java:306)         at sun.net.www.http.HttpClient.New(HttpClient.java:323)         at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:860)         at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:801)         at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:726)         at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1049)         at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:373)         at sun.plugin2.applet.Applet2ClassLoader.getBytes(Applet2ClassLoader.java:458)         at sun.plugin2.applet.Applet2ClassLoader.access$000(Applet2ClassLoader.java:46)         at sun.plugin2.applet.Applet2ClassLoader$1.run(Applet2ClassLoader.java:126)         at java.security.AccessController.doPrivileged(Native Method)         at sun.plugin2.applet.Applet2ClassLoader.findClass(Applet2ClassLoader.java:123)         ... 6 more 异常：java.lang.ClassNotFoundException: com.emc.navisphere.gui.jnfx.JNfxMain.class

这是Debian的一个Bug, 解决办法是将/etc/sysctl.d/bindv6only.conf中的

net.ipv6.bindv6only = 1

改为

net.ipv6.bindv6only = 0

然后重启procps:

invoke-rc.d procps restart

该问题对应的Debian Bug链接如下:

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=560238
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=560056

对应的Sun Bug 链接如下:

http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6342561