When plugin try to load password protected source or through password protected proxy server using HttpURLConnection, NullPointerException is thrown.

java.lang.NullPointerException
        at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:555)
        at sun.plugin.net.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:298)
        at sun.net.www.protocol.http.HttpURLConnection.getHeaderField(HttpURLConnection.java:1092)
        at sun.plugin.net.protocol.http.HttpURLConnection.checkCookieHeader(HttpURLConnection.java:276)
        at sun.plugin.net.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:296)
at sun.net.www.protocol.http.HttpURLConnection.getHeaderField(HttpURLConnection.java:1120)
at sun.net.www.protocol.http.HttpURLConnection.getResponseCode(HttpURLConnection.java:1134)
at sun.applet.AppletClassLoader.getBytes(AppletClassLoader.java:224)
at sun.applet.AppletClassLoader.access$100(AppletClassLoader.java:42)
at sun.applet.AppletClassLoader$1.run(AppletClassLoader.java:143)
at java.security.AccessController.doPrivileged(Native Method)
at sun.applet.AppletClassLoader.findClass(AppletClassLoader.java:140)
at sun.plugin.security.PluginClassLoader.findClass(PluginClassLoader.java:191)
at java.lang.ClassLoader.loadClass(ClassLoader.java:309)
at sun.applet.AppletClassLoader.loadClass(AppletClassLoader.java:114)
at java.lang.ClassLoader.loadClass(ClassLoader.java:265)
at sun.applet.AppletClassLoader.loadCode(AppletClassLoader.java:470)
at sun.applet.AppletPanel.createApplet(AppletPanel.java:551)
at sun.plugin.AppletViewer.createApplet(AppletViewer.java:1610)
at sun.applet.AppletPanel.runLoader(AppletPanel.java:480)
at sun.applet.AppletPanel.run(AppletPanel.java:293)
at java.lang.Thread.run(Thread.java:539)