File APIs for Java Developers
Manipulate DOC, XLS, PPT, PDF and many others from your application.
The moose likes Applets and the fly likes NullPointerException: name can't be null Big Moose Saloon
  Search | Java FAQ | Recent Topics | Flagged Topics | Hot Topics | Zero Replies
Register / Login
JavaRanch » Java Forums » Java » Applets
Bookmark "NullPointerException: name can Watch "NullPointerException: name can New topic

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 Source)
at<init>(Unknown Source)
at java.lang.SecurityManager.checkDelete(Unknown Source)
at javax.comm.CommPortIdentifier.getPortIdentifiers(
at com.amkor.stripmap.ReadWriteC.getPorts(
at com.amkor.stripmap.ReadWriteC.<init>(
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 Source)
at Source)

What is lacking in my code?

Ulf Dittmer

Joined: Mar 22, 2005
Posts: 42965
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 ]
Darren Alexandria
Ranch Hand

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

God bless!
I agree. Here's the link:
subject: NullPointerException: name can't be null
It's not a secret anymore!