导出时Java App出现意外行为

Question

I have a very strange problem, that I can't figure out, the thing is that my aplication runs perfectly on the IDE (Eclipse), but not when exported, when I run the jar (double click) the aplication start but some functionality is missing (loading from a template file, but this does not happend when loading from a normal file), when I try to run it from console (java - jar my.jar) in order to see any error message it turns out that my aplication works perfectly fine! :S ...

Some more info:

My app is running over windows 7

I start the task manager, and I noticed that when I start my aplication using double click its under the name java.exe *32, and when I do it from command line its under the name java.exe (without "*32"), as far as I know I programmed nothing related to a 32 or 64 bits functionallity.

"Solved"

Well I was not able to solve it the way I wanted, as far as I was able to find, i found that there were a problem between the 2 java versions I was running x32 & x64, I deleted the 32 bit version and it start working as a charm, but I'm still not sure about what happend, I give my thanks to @Sajal Dutta one of its comments help me to understand part of the problem, thanks to all of you anyway, I'll keep searching until I find the problem...

Answer 1

When you create a jar from Eclipse, your assets don't get copied over to jar or location is not preserved. Open the jar and check if you have your templates in the right location or you have it at all.

To have the exported jar include your assets/resources-

1. Right click on your project in Eclipse. Then New -> Source Folder.
2. Name the source folder anything. eg template_src.
3. Copy or drag the entire directory of your template to template_src. Then make the jar.

Answer 2

Since it works via the command line but not when double-clicking the jar, it is likely that the working directory is different (and that you're loading the template with a relative path). When you run an executable jar by double-clicking, on some operating systems, the working directory is the home directory whereas when you run from the command line, it's the directory you're currently in.

Answer 3

The "files" in the jar are not handled by File, but are resources;

URL url = getClass().getResource("...");
InputStream in = getClass().getResourceAsStream("...");

Then, the file paths inside a jar, or on a non-Windows platform are case-sensitive .

"Template_A.xml"

is not

"template_a.xml"

Also you might inspect the jar with 7zip or WinZip.