Re: need help with jar archiv

Knute Johnson <>
Sun, 08 Apr 2007 10:59:06 -0700
Sunil Pilani wrote:

I need some help with my jar archive.
I need to read a file in my program. I do that with
To locate the file I use getClass().getResource("key/key.txt")
I used the above class.getResource so that teh programme locates the file
in the jar archive. But it doesn't work after getting packed in
jar, otherwise works perfectly alright.

I use the following command to make the jar:
jar cmf caesar/mainClass cipher.jar caesar/c*.class caesar/key/key.txt

Can somebody please help me with that.

I get a error-message as follows
file:\E:\myprogs\Security\cipher.jar!\caesar\key\key.txt ( The syntax for
the filename,
directory and data volume is wrong)
The relevant code lines:
URL fileUrl = getClass().getResource("key/key.txt");

// String filename = fileUrl.getFile();


try {


BufferedReader read =

new BufferedReader

(new FileReader(fileUrl.getFile()));



Probably the simplest solution is to use a different method:

InputStream is = getClass().getResourceAsStream("key/key.txt");

You also need to be careful with the package names. Confirm that your
jar file actually contains key/key.txt and not something else.


Knute Johnson
email s/nospam/knute/

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