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JAR File is not Executing

I am Cleaning and Building a project, which is creating its .jar file in its "dist" folder. However the issue is that, I'm not able to run it. I double click on it and nothing happens.
I have set up "bin" folder of JDK in "Path" option in environment variables.
Is there is anything that I am missing? I am new to all this and help is really appreciated.

Suggested
Learn how to make executable file yourself , rather than depending on auto generated jar file
Here is a tutorial.
In case of default jar file ,
most likely you have to execute
java -jar MY_AWESOME_JAR_FILE_NAME.jar

There are 3 common reasons for this:
On windows, and using sysin/sysout
Windows, because apparently microsoft is not capable of fixing ancient silliness, forces upon apps that they either have a terminal in which case an ugly black box always pops up, or they don't, and can't later make one. That means that on windows only, there are 2 java executables: java.exe and javaw.exe, with as only difference that javaw doesn't get a box. But, it doesn't get a box - sysin and sysout do pretty much completely nothing.
By default, double clicking a jar starts it with javaw, which means if your app's only interaction is reading from System.in and writing to System.out or System.err, you won't see anything.
There is no fix to this, other than to make a GUI app, or make a batch file (a windows only concept) that explicitly runs java.exe.
This doesn't apply to linux or macs.
jar file broken
A runnable jar file is one that has three properties:
There is a class inside the jar that has a public static void main(String[] args) method inside.
That class is named (fully qualified) in the manifest of the jar, under key Main-Class
Any deps needed are either baked into the jar, or in another jar, and those other jars are named, space-separated and relative to the dir that the jar you're double clicking lives in, in the manifest, under key Class-Path. Note that the global environment variable CLASSPATH does nothing when double clicking jars.
You can check all this; jars are just zip files. Also, the jar tool in your JDK can unpack them, and the manifest is just a file named META-INF/MANIFEST.MF inside. You can open it up, have a look if it's properly configured.
java install broken
Check any random runnable jar first. Maybe you installed a headless java. Note that these days (since JDK9 and up), an 'end user' wouldn't even install a java and the notion of double clicking a jar to run it is basically obsolete. To make 'desktop' java applications, you'd ship an entire JRE (treeshaken if you want) and you're responsible for an installer. There are some limited tools in the JDK (since 9) that help you out (such as jlink).

Use the CLI to see whether your Java is set up properly, the jar is corrupted, or the jar is incompatible with installed Java version.
Ensure the jar file is properly associated with Java binary. The instruction can be found here

Just edit manifest file adding main method in there. If you have any additional reference libraries simply put them into class path there.
Manifest specificatin is located here:
https://docs.oracle.com/javase/tutorial/deployment/jar/manifestindex.html

Running .jar File Java 8

I've run .jar files before, but I've encountered a "different" situation, and I'm not sure what to do. I'd appreciate if someone could help me out.
Previously, I programmed with Java 6 and Eclipse Juno exported all my programs to runnable jar files. I'd get a .jar file that I could run by just double clicking on it. The files always looked something like this (note the jar file icon):
Recently, I wrote a program in Java 8 with Eclipse Luna (Release 4.4.0) and exported it to a runnable jar file, and I got something different (note the different file icon):
It no longer runs when I double click it. Instead, my computer uncompresses the jar, as it would a zip file. I tried running it from terminal. I cd'd to the directory and typed
java -jar graph3D.jar
I got the following error message:
Error: Unable to access jarfile graph3D.jar
After uncompressing the jar file, I found a folder named META-INF with the manifest file, MANIFEST.MF in it. It was the only file that seemed to resemble an executable file. Do I have to do something with that?
Could someone explain how I can run the second jar file graph3D.jar? Is it something new with Java 8, or something different about Eclipse Luna, or something else?
(Both programs run fine in Eclipse, by the way)
Thanks for your time and help.
Edit:
Below was the dialog box Eclipse displayed if anyone is interested.
Selecting "Use .jar;.zip" makes the filename "graph3D.jar;.jar;*.zip" .
Selecting "Use .zip" makes the filename "graph3D.jar;*.zip"
Selecting "Cancel" doesn't let you go forward.
You'd have to manually delete the extra file extension.

Somehow when you exported the file, the filters for the file dialog box (*.jar;*.zip) got attached to the filename, which is graph3D.jar;*.jar;*.zip, not graph3D.jar. Java can't find it because it doesn't have the name you supplied. Rename the file and pay close attention next time you export; either you fat-fingered something, or you're triggering a significant bug that needs fixing.

I recommend that you will access the build folder after you've built your project on the IDE under your project folder (in your workspace) and copy both the libraries folder and the .jar and post them wherever you want the program to be "installed", you'll then have an executable jar that should run smoothly without problems, just as I said don't forget the lib folder.

I think there is nothing new in Java 8 related with the running jar, I guess you need to check the the Eclipse export issues, it seems your classes are missing from your second jar file.

Netbeans created Jar does not work, but inside IDE program works

The Netbeans created Jar does not work, but inside the IDE program it works perfectly.
I believe that the main class is set, so I'm not sure what the problem is, I think it might have something to do with the txt files I'm using, in the IDE they are in C:\Users\J\Documents\NetBeansProjects\PointOfSale\src\pointofsale (the text files are with my java files). After building the dist/ jar though the text files are inside the jar with no folders or anything (Jar is in C:\Users\J\Documents\NetBeansProjects\PointOfSale\dist). I this this might be the problem, if its helpful, I access the files using
File file = new File(System.getProperty("user.dir")+"\\src\\pointofsale\\list.txt");

You need to use Class.getResourceAsStream() to load the file. It searches from inside the classpath (and therefore from inside the jar). Now you can't load the list.txt because it doesn't exist in the directory you're specifying, it's inside your jar.
Something along the lines of
getClass().getResourceAsStream("list.txt"); // Or "/list.txt"
Will give you an InputStream you can use to load the file contents.

Running an internal exe in java

Im able to run exe's in runtime via Runtime.getRuntime().exec(filePath), but this only seems to work for external exe's outside of the jar. I want to run an exe that I've packaged inside of the jar. How would I do this? I'd believe theres a jar load function, because I've seen code that loads it the same way using the name of the file in the jar, but that returns an IO error for me.

You can copy it to a temporary location outside the jar file, I think that is possible.

getResourceAsStream works in Eclipse IDE but not in JAR format

This is a really common error, because there are tons of threads about it, but I'm not sure if since my situation is slightly different from all of them the solutions don't work?
Basically, I'm in eclipse. I have a source folder called src, then I have a package that goes down three folders, then the class in question. The class uses the code:
BufferedImage im = ImageIO.read(Thread.currentThread().getContextClassLoader().getResourceAsStream(filenames[x].concat(extension)));
surrounded by a try/catch. filenames is an array of all the file names I am loading (this code is run multiple times in a for loop) and extension is ".PNG". The pictures are located in another source folder called EngineTextures.
Running this program works fine in Eclipse! All textures are loaded and all my other code runs! However, I export it as a runnable jar and run it in command prompt to recieve input == null errors on all of them, pointing to the line that has ImageIO.read(Thread.currentThread() in it.
The kicker is this whole thing worked in a separate project before, and when I even tried re-exporting that project, I recieve the same errors on completely unchanged code. This leads me to believe I have some obscure Eclipse setting changed wrongly.
Opening the jar, my MANIFEST.MF has a version of 1.0 and a classpath of just plain ., which I thought was correct for this kind of thing? The Main-Class points to the right place, and all my pictures are right there next to the META-INF folder.
Solutions I've looked at unsuccessfully:
getResourceAsStream working in eclipse, but not when run as applet in browser
Why does getResourceAsStream() work in the IDE but not the JAR?
Java IDE - Eclipse, Importing resources
Audio file in jar made by Eclipse IDE
getResourceAsStream() returning null in jar but fine in eclipse
Additionally, I completely deleted the workspace and recopied my pictures and code into the same state, thinking maybe some .metadata thing was wrong, to no avail.
Thank you, in advance, for any and all help. I hate to make a repeat like this but no solutions have worked thus far. Please let me know if I have not given any crucial information.

Opening the jar, my MANIFEST.MF has a version of 1.0 and a classpath of just plain ., which I thought was correct for this kind of thing?
No. The Class-Path entry in a JAR file names other JAR files, relative to the location of this jar file. It doesn't name directories:
"The value of this attribute specifies the relative URLs of the extensions or libraries that this application or extension needs."
That in turn implies that resources to be loaded via getResourceAsStream() must be in JAR files.