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Thread: Java Applet exception when accessing an FTP server

  1. #1
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    Exclamation Java Applet exception when accessing an FTP server

    Hi,

    I'm creating an applet for my website to enable users to upload files to an FTP server. When I run the applet in the browser I get the following exception.

    java.security.AccessControlException: access denied (java.net.SocketPermission ftp.powweb.com resolve)
    at java.security.AccessControlContext.checkPermission (Unknown Source)
    at java.security.AccessController.checkPermission(Unk nown Source)
    at java.lang.SecurityManager.checkPermission(Unknown Source)
    at java.lang.SecurityManager.checkConnect(Unknown Source)
    at sun.plugin2.applet.Applet2SecurityManager.checkCon nect(Unknown Source)
    at java.net.InetAddress.getAllByName0(Unknown Source)
    at java.net.InetAddress.getAllByName(Unknown Source)
    at java.net.InetAddress.getAllByName(Unknown Source)
    at java.net.InetAddress.getByName(Unknown Source)
    at java.net.InetSocketAddress.<init>(Unknown Source)
    at java.net.Socket.<init>(Unknown Source)
    at org.apache.commons.net.DefaultSocketFactory.create Socket(DefaultSocketFactory.java:52)
    at org.apache.commons.net.SocketClient.connect(Socket Client.java:161)
    at org.apache.commons.net.SocketClient.connect(Socket Client.java:249)
    at Main.loginAndConnect(Main.java:83)
    at Main$1.actionPerformed(Main.java:48)
    at javax.swing.AbstractButton.fireActionPerformed(Unk nown Source)
    at javax.swing.AbstractButton$Handler.actionPerformed (Unknown Source)
    at javax.swing.DefaultButtonModel.fireActionPerformed (Unknown Source)
    at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
    at javax.swing.plaf.basic.BasicButtonListener.mouseRe leased(Unknown Source)
    at java.awt.Component.processMouseEvent(Unknown Source)
    at javax.swing.JComponent.processMouseEvent(Unknown Source)
    at java.awt.Component.processEvent(Unknown Source)
    at java.awt.Container.processEvent(Unknown Source)
    at java.awt.Component.dispatchEventImpl(Unknown Source)
    at java.awt.Container.dispatchEventImpl(Unknown Source)
    at java.awt.Component.dispatchEvent(Unknown Source)
    at java.awt.LightweightDispatcher.retargetMouseEvent( Unknown Source)
    at java.awt.LightweightDispatcher.processMouseEvent(U nknown Source)
    at java.awt.LightweightDispatcher.dispatchEvent(Unkno wn Source)
    at java.awt.Container.dispatchEventImpl(Unknown Source)
    at java.awt.Component.dispatchEvent(Unknown Source)
    at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
    at java.awt.EventQueue.access$000(Unknown Source)
    at java.awt.EventQueue$1.run(Unknown Source)
    at java.awt.EventQueue$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.AccessControlContext$1.doIntersectio nPrivilege(Unknown Source)
    at java.security.AccessControlContext$1.doIntersectio nPrivilege(Unknown Source)
    at java.awt.EventQueue$2.run(Unknown Source)
    at java.awt.EventQueue$2.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.AccessControlContext$1.doIntersectio nPrivilege(Unknown Source)
    at java.awt.EventQueue.dispatchEvent(Unknown Source)
    at java.awt.EventDispatchThread.pumpOneEventForFilter s(Unknown Source)
    at java.awt.EventDispatchThread.pumpEventsForFilter(U nknown Source)
    at java.awt.EventDispatchThread.pumpEventsForHierarch y(Unknown Source)
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
    at java.awt.EventDispatchThread.run(Unknown Source)
    Exception in thread "Thread-16" java.lang.NullPointerException
    at org.apache.commons.net.SocketClient.getLocalAddres s(SocketClient.java:441)
    at org.apache.commons.net.ftp.FTPClient._openDataConn ection_(FTPClient.java:447)
    at org.apache.commons.net.ftp.FTPClient.__storeFileSt ream(FTPClient.java:396)
    at org.apache.commons.net.ftp.FTPClient.storeFileStre am(FTPClient.java:1391)
    at FileUploader.run(FileUploader.java:60)

    Im using Apache FTP client and when The code reaches the connect method the exception occurs. Can anyone help me in this please


    Thanks

    Sara


  2. #2
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    Default Re: Java Applet exception when accessing an FTP server

    It's a security issues. The current security policy does not allow you to connect on specified host/port, so you will need to change the security policy. More about how to do this and the topic here (2nd half of the page): Java RMI Tutorial.

    application context
    Last edited by daniel.j2ee; December 13th, 2011 at 04:01 PM.

  3. #3
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    Default Re: Java Applet exception when accessing an FTP server

    Sign the applet. See the following:
    What Applets Can and Cannot Do (The Java™ Tutorials > Deployment > Java Applets)

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