java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at sun.plugin.protocol.jdk12.http.HttpURLConnection.getInputStream(UnknownSource)
at sun.plugin.protocol.jdk12.http.HttpURLConnection.checkCookieHeader(UnknownSource)
at sun.plugin.protocol.jdk12.http.HttpURLConnection.getInputStream(UnknownSource)
at java.net.HttpURLConnection.getResponseCode(Unknown Source)
at sun.applet.AppletClassLoader.getBytes(Unknown Source)
at sun.applet.AppletClassLoader.access$100(Unknown Source)
at sun.applet.AppletClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)

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