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NullPointerException: name can't be null

Darren Alexandria
Ranch Hand

Joined: Aug 17, 2007
Posts: 185
Good day!
I have this code which I want to implement in an Applet and put in on a JSP page after.



But after running this program, I get this error:

java.lang.NullPointerException: name can't be null
at java.io.FilePermission.init(Unknown Source)
at java.io.FilePermission.<init>(Unknown Source)
at java.lang.SecurityManager.checkDelete(Unknown Source)
at javax.comm.CommPortIdentifier.getPortIdentifiers(CommPortIdentifier.java:70)
at com.amkor.stripmap.ReadWriteC.getPorts(ReadWriteC.java:38)
at com.amkor.stripmap.ReadWriteC.<init>(ReadWriteC.java:78)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at java.lang.Class.newInstance0(Unknown Source)
at java.lang.Class.newInstance(Unknown Source)
at sun.applet.AppletPanel.createApplet(Unknown Source)
at sun.applet.AppletPanel.runLoader(Unknown Source)
at sun.applet.AppletPanel.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)


What is lacking in my code?

Thanks.
Ulf Dittmer
Marshal

Joined: Mar 22, 2005
Posts: 39576
    
  27
In order to perform socket I/O applets generally need to be signed; is that the case?

As an aside, you should remove the constructor, and move everything that's in it into an init() method.
[ October 19, 2007: Message edited by: Ulf Dittmer ]

Ping & DNS - updated with new look and Ping home screen widget
Darren Alexandria
Ranch Hand

Joined: Aug 17, 2007
Posts: 185
thank you for your reply!

God bless!
 
I agree. Here's the link: http://aspose.com/file-tools
 
subject: NullPointerException: name can't be null
 
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