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How to read a file packaged in a jar file

Rajani Gummadi
Ranch Hand

Joined: Dec 17, 2010
Posts: 48
Hi All,

I have this embarssing problem, in reading a file which is packaged in a jar file.

I have a project in eclipse, say sample. My project structure is as below



Under this setup, I can simply access the file in Sample.java, as below


and it works like a gem .

Now I exported this project as a runnable jar file and when I looked into the jar file, sample.properties is missing, as expected.

So, in order to have this file available in jar file, I moved sample.properties into src folder. But this time, FileReader fails, as it could not find the file for apparent reasons.

Exception Caused: The property file sample.properties could not be resolv
ed java.io.FileNotFoundException: file:\C:\Projects\Sample.jar!\Sample.properties (The filename, directory name, or volume label syntax is incorrect)
at java.io.FileInputStream.open(Native Method)

I know that the way, I'm accessing the file in FileReader is the problem, but not able to fix it. How can access the file when that is the part of the jar file, to which class belongs. This is apparently the most common way of doing where everything is jar'ed together.
Wouter Oet
Saloon Keeper

Joined: Oct 25, 2008
Posts: 2700

That is because once it is packaged in a jar it is no longer a file. You can load resources with a class object which will provide the resource as a stream or URL.


"Any fool can write code that a computer can understand. Good programmers write code that humans can understand." --- Martin Fowler
Please correct my English.
 
It is sorta covered in the JavaRanch Style Guide.
 
subject: How to read a file packaged in a jar file