| Pls make my eclipse to look for images [message #20874] |
Tue, 13 May 2003 11:21  |
Eclipse User |
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Originally posted by: appzworm.hotmail.com
Hi all,
I am just experimenting with eclipse. I developed a simple JFrame using
eclipse and my project structure is like this
MyProject
|-src
|-mypackage.ui
|-MainFrame.java
|-images
|-doc
Now i have put the frmae icon and other label image files under /images
folder and I access the images thru the URL object
getClass().getClassLoader().getresource("images/file1.gif");
But when I run the program I am getting a NullPointerException and the
program just exits. But I exported the same project into a jar file with a
manifest with the full mainclass name(myackage.ui.MainFrame). When I run
this jar file, voila, it simple runs wothout any problem. Pls help me in
correcting the mistake which I am overlooking somewhere. Thanks a lot
friends
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| Re: Pls make my eclipse to look for images [message #21360 is a reply to message #20874] |
Tue, 13 May 2003 13:41  |
| Eclipse User |
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Originally posted by: wegener.cboenospam.com
appzworm wrote:
> Hi all,
> I am just experimenting with eclipse. I developed a simple JFrame using
> eclipse and my project structure is like this
> MyProject
> |-src
> |-mypackage.ui
> |-MainFrame.java
> |-images
> |-doc
> Now i have put the frmae icon and other label image files under /images
> folder and I access the images thru the URL object
> getClass().getClassLoader().getresource("images/file1.gif");
> But when I run the program I am getting a NullPointerException and the
> program just exits. But I exported the same project into a jar file with a
> manifest with the full mainclass name(myackage.ui.MainFrame). When I run
> this jar file, voila, it simple runs wothout any problem. Pls help me in
> correcting the mistake which I am overlooking somewhere. Thanks a lot
> friends
You need to get the images directory on the classpath. In Eclipse 2.1,
you can add it as a Class Folder on the Properties->Java Build
Path->Libraries tab
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| Re: Pls make my eclipse to look for images [message #21390 is a reply to message #21360] |
Tue, 13 May 2003 14:23 |
| Eclipse User |
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But you need to put images under another directory too. That is because
if you made "images" a class folder, you can't access it using
"images/xyz.gif", you would need to use just "xyz.gif". This is because
the "images" directory becomes a root in the classpath.
Rich
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| Re: Pls make my eclipse to look for images [message #22251 is a reply to message #21390] |
Wed, 14 May 2003 09:42 |
| Eclipse User |
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Originally posted by: appzworm.hotmail.com
Richard L. Kulp wrote:
> But you need to put images under another directory too. That is because
> if you made "images" a class folder, you can't access it using
> "images/xyz.gif", you would need to use just "xyz.gif". This is because
> the "images" directory becomes a root in the classpath.
> Rich
Thanks. Its working now. But can you please explain me the classpath
mechanism in eclipse, which led to this anomaly? Is there anyway I can use
the images folder as such rather than putting it under another folder and
adding that to the buildpath? Now why the jar file created was working
without any hitch in the first instance? TIA
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| Re: Pls make my eclipse to look for images [message #22920 is a reply to message #22251] |
Wed, 14 May 2003 14:58 |
| Eclipse User |
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Because when you created the jar file, you were running outside of
eclipse, and so you created your own classpath. When you exported into
the jar, did you in addition copy the images directory into the jar?
If you did, then you essentially added the images directory to the
classpath.
Look in the help for Eclipse under Java Development User Guide->Getting
Started->Project Configuration Tuturial
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