• Post Reply Bookmark Topic Watch Topic
  • New Topic
programming forums Java Mobile Certification Databases Caching Books Engineering Micro Controllers OS Languages Paradigms IDEs Build Tools Frameworks Application Servers Open Source This Site Careers Other all forums
this forum made possible by our volunteer staff, including ...
Marshals:
  • Campbell Ritchie
  • Jeanne Boyarsky
  • Bear Bibeault
  • Knute Snortum
  • Liutauras Vilda
Sheriffs:
  • Tim Cooke
  • Devaka Cooray
  • Paul Clapham
Saloon Keepers:
  • Tim Moores
  • Frits Walraven
  • Ron McLeod
  • Ganesh Patekar
  • salvin francis
Bartenders:
  • Tim Holloway
  • Carey Brown
  • Stephan van Hulst

NullPointerException: name can't be null  RSS feed

 
Ranch Hand
Posts: 185
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
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.
 
Rancher
Posts: 42974
76
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
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
Posts: 185
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
thank you for your reply!

God bless!
 
crispy bacon. crispy tiny ad:
Programmatically Create PDF Using Free Spire.PDF with Java
https://coderanch.com/wiki/703735/Programmatically-Create-PDF-Free-Spire
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
Boost this thread!