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Is there a clean way to fix files path issue whether the program is launched from console or Eclipse?

I'm currently working on a Java project in which I have to open files I stored in a data directory next to src.
When I launch my program from Eclipse, to access these files: I type "data/fileName" whereas when I use console I have to type "../data/fileName".
(I couldn't manage to execute java src/Main from project directory and got the error :
Error: Could not find or load main class src.Main.java
Caused by: java.lang.ClassNotFoundException: src.Main.java )
Is there a way to make my program runnable on both console and Eclipse?
To give some context: I usually intended to run only on Eclipse but I encountered issues launching nano from Eclipse ($TERM variable , redirecting pipes to dev/tty also) so console execution has become a requirement.
I can't change my Eclipse configuration since this project won't be run on my computer and if it doesn't run because of default Eclipse settings, well...
Thank you for your replies.
Cordially.

Yes. Don't put those files there. There are 2 broad categories:
Read-only data that is as much a part of your app as your class files are. Think 'list of US states for the 'state' dropdown', 'an icon png to be shown on my user interface', 'a file containing a bunch of SQL to be used to initialize an empty database', and more.
For this, the proper way to go is YourClass.class.getResourceAsStream("foo.txt"), which will give you an input stream for reading the file "foo.txt", which is in the same place "YourClass.class" is. Even if it is in a jar file, for example.
This does mean that as part of your build, these files need to be in the jar. eclipse's limited build system does this. If you level up as a programmer and use a build system (you should be levelling up here), put them in src/main/resources and the build system should take care of it.
Or, the second category: Files that the user is supposed to edit, or files that need to be modified by your app.
These don't go anywhere near your jar file; executable and user-editable stuff should be nowhere near each other. These should be in the user home dir, you can fetch it with System.getProperty("user.home").
Note that to run java stuff, 'src' shouldn't be part of the story at all, java can't run source files, only class files. Also, the argument isn't a dir, it's a class name. java -cp path/to/your/app.jar com.foo.pkg.YourClass is how you run java code, not java src/Main.

runnable .jar file runs on my windows device but won't on others(windows too)

So I've made up a little programm for my mom to use. I exported it into a runnable .jar, which is a first for me, so I obviously screwed it up.
Actually the file works just fine on my computer. But when I try it on hers, double clicking on the file just gives me an error : "could not find Main class : controller.Main". And the programm won't start
I used eclipse GUI to export it (right click on projet -> export -> runnable JAR), and it gave out a file working well on my computer.
If it is of any help, my programm uses a bunch of resources files, but I included them in the right place in the folder that I gave to my mother so it should not be the problem (besides, it would glitch out when trying to use the images, but not stop it from launching, according to some personnal tests)
What can be the Reason for it to work on my device, but not another one (both Windows) ? And how to fix this ?
N.B: I have included a MANIFEST.MS file in my project before exporting, but Eclipse didn't make any explicit mention to it when exporting, so I think it didn't take it into account. Besides, I reffered to my main class as Main (and not controller.Main as in the error message I got on my mother's computer). This was probably wrong of me, but I think it shows that Eclipse didn't care much for my manifest and kinda made his own.
Thanks in advance !
If you want a link to download the folder, to check it out yourself, let me know ! (it's a bit heavy though, there's quite a lot of images)
EDIT : I get different error messages with different computer. One computer would give me this first message :
first computer error
Another computer gives me those 2 error messages (one after another)
2nd computer error (1/2)
2nd computer error 2/2
And of course, it still runs fine on mine, just with a double click !
My .jar file (opened as an archive) contains :
3 folders corresponding to my packages : controller, model, view
1 folder META-INF containing the MANIFEST.MF generated by eclipse, looking like so :
Manifest-Version: 1.0
Main-Class: controller.Main
Class-Path: .

Ok ! I could figure it out. So there were actually 2 problems on top of each other :
first, I think Martin's suggestion was correct. After researches on the new error message, it became clear that native calls had probably had Something to do with the problem, although I have no idea what native Library I was using. I could solve this first part of the problem by selecting another option to handle libraries in the eclipse export feature : I chose the option "package required libraries into genereated JAR" (instead of "extract required libraries into generated JAR" before), and it make the error message go away !
Even though the message disappeared, the app would still not launch. But the problem was more obvious this time; I Simply compiled and exported the file with a java 9 JDK for eclipse, while trying to run it on a java 8 software (I think java 9 is only available in its developper version to this day). So I just downloaded java 8 JDK, configured the build path to use the latter, and it finally worked on the other computer.
Thanks to Martin who helped me get on track with the right questions !

Can't find the path specified of a font

Firstly i'm 99% certain my path isn't wrong since it's the copied qualified path of the font file. I have no clue why java can't find the file, please help?
Picture of the error code and my code to load up the font
http://i.imgur.com/uEcAIxd.png

The problem is likely that the 1game project isn't on the classpath for your Eclipse run configuration.
Since you're using Eclipse: Click on the little triangle next to the debug symbol or run circle. Then click on Debug Configurations/Run Configurations. Select the run configuration you've been using. Go to Classpath, select User Entries, and then click Advanced. Add folders, then select the root folder for your project (1game). Try running the run configuration again.
It should be noted that this is only a solution to get your code to run provided that the folder where the file in question exists will also exist at the same path after you've deployed your code. Since you've hard-coded the path in, I'm assuming this is the case. However, you might want to confirm. If the resources will be packaged in the jar with the rest of your code, you'll want to use Assets.class.getResourceAsStream instead of a File (Thanks to MadProgrammer for pointing this out).

Can't run Spring Tool Suite installer on Mac OS mavericks?

Whenever I unpack dmg installer I see image containing launcher something like - "Installer - spring-tool-suite-3.6.0.CI-B1808453-e4 ". After I try to launch this installer the loading indicator hangs a little, disappears and nothing happens. I am being forced to migrate to Mac OS due to work environment. I can't even launch the installer.
I suspect this is due to default Apple Java (whatever that means I am not OS X expert) being deleted on this laptop and JDK8 is on the home path.
ALE:~$ echo ${JAVA_HOME}
/Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home/
Well, this forces me to migrate to IntelliJ, but I can't just believe that because of someone else fashion I can't do the work usual way...
Any hint? I don't even get error message..

Had the same issue - download .tar.gz instead of .dmg distribution. There (sts-bundle/sts-3.X.X.RELEASE/STS.app) you'll have STS.app it should run.

Since there is an interest around the question I will post the valid solution. Now what I did which caused an error - deleted default mac os java, and installed java 8 as HOME. Now Eclipse (STS, JasperSoftStudio or whatever) which was installed using dmg will look up the java not anywhere near your HOME directory. (even if it is inside Library as it should be).
Solution: Go to eclipse distribution directory (typically under applications) find the launcher, right click on the launcher, "show package contents", go to MacOS folder, open the .ini file(will have different name for different distributions) and locate -vim entry which statically points to some mac os location attempting to find java lib which is not there and never should be. Make sure your java home path is set, as now it will start to behave normally and look up home path.
If this still did not fix the issue, attempt to delete workspace folder if left from previous installation(or rename it) and play with Locked/Unlocked on the launcher properties. However the last two options are rather dances around the fire to summon spirits. The first suggestion should work 100%.
Make sure the error we are solving is something like: "Unable to locate plugin bla bla" in the error log.
All the best.

Eclipse will not run programs or detect errors

My eclipse seems to be pretty screwed on my laptop. Whenever I load a program up from College, it does not detect the errors or anything. Also now when I attempt to run the program, it won't allow it; i'm given the message
unable to find an ant file to run
Anyone able to help me out?

1-Create a new project in Eclipse
2-After the project is created, look in the package explorer window pane on the left and right click on the src folder.
3-There are two methods for the next step, you could either add a New > Class, and then copy and paste everything from your old java file to the new class (make sure the class name is the same), or the better route would be to Import.
4-After clicking Import, select File System under the general folder. Click Next.
5-Browse for the java folder where your source files are located. Once you click ok, it will add all of the source files to the right pane.
6-Select which files you want to add and click Finish.
7-Now if you look at your Package Explorer window you should see the source files. Now just
compile them, and the error shouldn't appear and you can run them just like before.
By creating the new project, you're making sure Eclipse knows where your source files are located (in ./src) so that it can compile your code in that location.