Develop Reference

How to save Java Project from IntelliJ IDEA to Git repo so it will build on another PC after cloning?

I'm building a simple calculator app from a tutorial/class on Pluralsight (Java Fundamentals class), which starts with a Main.java file, and adds a class file later, MathEquation.java.
I created a Git repo to track my progress, and uploaded to Github: JavaFundamentalsClass. I used GitIgnore.IO to find a Java IntelliJ .gitignore file, and everything seemed to be working fine on the original PC I was using.
However, after switching over to a different PC, with a fresh install of IDEA, I cloned down the repo from Github, and found that the project would not build and/or run. I get this error:
"C:\Program Files\RedHat\java-1.8.0-openjdk-1.8.0.191-1\bin\java.exe" -Dfile.encoding=windows-1252 -jar ""
Error: Unable to access jarfile
Process finished with exit code 1
I suspect that there is something in the .gitigore file that is keeping some of the project, dependency, or build information from being saved in the repo that keeps IDEA from having all the info it needs to build and run the Main.java correctly.
Can anyone help? You should be able to download the project from the repo linked above in it's currently broken state, including the .gitignore file.
Additional Info
I wiped my repo clean and recloned and I forgot, originally it doesn't even give me the run button (it is grayed out). I had to do a procedure with "Add Configuration" from a search I did for that to show up to get the error above.
Also, I did install java from the OpenJDK, rather than oracle. I figured with Oracle cutting off commercial development maybe start the switch now as I'm learning, but maybe that's the issue (normal Java on my other PC).
It's working, but...
First thing - Intellij needs to know where Java is. It appears that if the SDK/JDK is not installed prior to Intellij, you will need to tell it where Java is after installing. Or if you use OpenJDK instead of Oracle Java SDK. You can do that at View/Open Library Settings, under Platform Settings / SDKs (select the JDK home path).
Then, after setting up Java, I am able to get everything working in Intellij IDEA if I find the Main.java file, right-click, and choose "Run main.main()". This runs the program okay, and also creates a Main configuration in the Run/Debug configuration area, and finally the "Run" button becomes available.
So I can get it working, but if I wipe all the files and clone it fresh from the remote repo, I have to go through running the Main.java file directly again to recreate the configuration.
So, this still doesn't answer my original question. Why doesn't this configuration get saved in the repo? What file is this information saved in? Is there something in the .gitignore file that is keeping this information from being saved to the repo?

Look like you have a different java version on your second machine.
First of all, check your java version
Update the configuration of your project, right now it pointing to java 1.8
https://github.com/LightCC/JavaFundamentalsClass/blob/master/.idea/misc.xml

I think it might be because of java not installed on the other PC you were trying. If it is installed just check whether the path mentioned has java executable file.

The first part is ensuring Java is setup, and that Intellij IDEA knows where Java is, per the other answers, comments, and addendums to the question.
The second part is setting up the run/debug configuration, per the "It's working but.." section of the question. This can be created automatically by right-clicking the file that has the main class to be run (usually Main()...), and selecting the "Run Main.main()" option (replacing Main and main() with the file and function which needs to be run)
The final piece is that to get the run/debug configurations to save to the repo, you either need to:
Share the workspace.xml file (i.e. make sure this is not in the .gitignore file). However, there is a lot of user-specific stuff in that file, so it should normally be excluded from the repo.
Or, edit the configuration and checkmark the "Share" box in the upper right-hand corner (just right of the "Name" field). This will put the configuration into a separate folder inside the .idea folder, which should not be excluded from the repo by .gitignore.

Error: Could not find or load main class sample.Main

I tried troubleshooting this problem for about 4 hours. Nothing worked.
I am using Java and Intellij and JavaFX.
What do I want to do?
I have created a JavaFX programm on Windows.
I want to execute this .jar on my Raspberry Pi.
Whenever I want to execute this jar I get this error in the console:
Error: Could not find or load main class sample.Main
sample is the package and Main is my class with the main method.
The programm works JUST FINE under windows. (In and outside of IntelliJ).
What steps did I already do?
Java is up-to-date on my pi. java -version returns 1.8. So we are good here.
I have imported my used libraries (Pi4J) in my project under project-structure -> libraries. & under modules -> dependencies.
I have defined a new artifact. I set a main Class (sample.Main) & under JavaFX I set the application class to sample.Main (both are given to me by Intellij) I then build the project by going to build -> build artifacts.
I checked the MANI-FEST under /src/META-INF/MANI-FEST and it indeed has
Main-Class: sample.Main
On my pi I went to the direction in which the jar file is. Then I ran: sudo java -jar Keimgeraet.jar which should work just fine. But then I get the error.
I probably have done more but forgot it already...
What might work but I don't know how I would to that:
In other threads people mentioned that my specified paths could be wrong on another computer (in this case the pi)
Here are some pictures [imgur] how everything is set up. Maybe that helps.
I will gladly try any answer! I am not the most experienced with java and the pi but I am not a complete starter.
Sidequestion: How can I include all the libraries in one final jar file?
If you need any more details feel free to ask!

How can I create an executable JAR with dependencies using Maven?
This should solve at once your main class declaration (in archive.manifest.mainclass in the maven plugin) and your inclusion of all libraries in the final jar (this will build two JARs: pay attention to take the one "xxx-jar-with-dependencies.jar").
If it still doesn't work with this Maven plugin, let us know.

No LeapJava in java.library.path

I'm encountering a problem with the build of my JavaFX project with the Leap Motion.
When I run the file.jar, the application's window is opening, but when I call the leap motion, it's not working any more.
I have the following error :
Native code library failed to load.
java.lang.UnsatisfiedLinkError: no LeapJava in java.library.path
Yet, I have configured the buildpath. I have added the leapJava.jar, with the native library x64.
I don't understand why it doesn't work ?
Anyone with an idea ?
Thanks

The LeapJava.dll is missing or the Java library path is not set up correctly. Please have a look at the docs - setting up a project:
https://developer.leapmotion.com/documentation/java/devguide/Project_Setup.html

I have followed each step in the Eclipse section. :/

Firstly, since you haven't mentioned any specification about your system, I am answering this in context with a 64 bit Ubuntu machine.
You will posses a libLeap.so and a libLeapJava.so in 'YourDeveloperKitDirectory'/LeapSDK/lib/x64/ . These files should be copied to your /usr/lib and the configuration/bulid path (if using IntelliJ IDE -> 'Edit Configurations'->'Application'->'configuration'->'VM options'->"-Djava.library.path=/usr/lib") should be appropriately stated.
Save and run your application.

I had this problem, what solved it was adding -Djava.library.path=/Path/to/LeapDeveloperKit_2.3.1+31549_mac/LeapSDK/lib to the command line call for the .jar file. (make sure your developer kit is the right version)
So rather than:
java -jar leapMotionProgram.jar
It had to be:
java -jar -Djava.library.path=/Path/to/LeapDeveloperKit_2.3.1+31549_mac/LeapSDK/lib leapMotionProgram.jar

Can't load Java Library

I am very new to Java and I am trying to run a program I got from a friend. I keep getting this error and I'm unsure how to solve the problem.
Application is starting. Fetching data. Please wait... (approx. 10s)
Exception in thread "main" java.lang.UnsatisfiedLinkError: Could not load SWT library. Reasons:
no swt-cocoa-4236 in java.library.path
no swt-cocoa in java.library.path
Can't load library: C:\Users\Andrew.swt\lib\win32\x86_64\swt-cocoa-4236.dll
Can't load library: C:\Users\Andrew.swt\lib\win32\x86_64\swt-cocoa.dll
at org.eclipse.swt.internal.Library.loadLibrary(Library.java:331)
at org.eclipse.swt.internal.Library.loadLibrary(Library.java:240)
at org.eclipse.swt.interal.C.<clinit>(C.java:21)
at org.eclipse.swt.widgets.Display.<clinit>(Display.java:101)
at view.MainWindow.open(MainWindow.java:77)
at view.MainWindow.main(MainWindow.java:65)
Apparently I'm missing the SWT library (swt-cocoa-4236 and/or swt-cocoa?), but I have no idea where to get it. That statement probably reveals my ignorance. If anyone could even point me in the right direction to where I might be able to solve the problem I'd be very grateful. Thanks!

Seems like the program that you are running is not built for your OS. SWT is OS dependant and JVM depedant. All SWT programs will use swt.jar which will be different based on the underlying OS. The one the program is using is built for Mac OS and seems like you are running that on a non-Mac system.
Regarding 'How to solve it', it depends on how the program that you are running is packaged.
Check the java version you are using and download appropriate SWT jar file.

I think Mubin (i.e. the above answer) is correct. here is where you can download the specific version of SWT.jar for your environment http://www.eclipse.org/swt/.
(I am answering your question for "I have no idea where to get it.")

little late to the game, but i just had the same problem and found this solution:
Here's what worked for me:
Right Click on your Project Folder of your HelloWorldSWT Project-> Properties -> Java Build Path -> Tab 'Projects'
Expand the 'org.eclipse.swt.cocoa.macosx.x86_64' folder by clicking on the arrow left to it
Select 'Native library location' and click Edit
Click the Workspace Button and select 'org.eclipse.swt.cocoa.macosx.x86_64', then click ok (serveral times).
That did the trick ... Ma-an

RCP's exec launcher can't find companion shared library on launch, but starts with click on org.eclipse.equinox.launcher_1.2.0.v20110502.jar

I'm building an Eclipse RCP application against Eclipse 3.7.1 and Java 1.6.
I'm also using Tycho to build, and have set up my RCP according to the Tycho tutorial from the EclipseCon 2011, to which I've stuck slavishly, apart from project names.
The application builds fine up until I get to Step 5 (adding a p2 repo, then adding a .product file. Well, it still builds fine, and everything is where it should be, but I cannot start the RCP by clicking on the .exe file from the repository in the workspace.
All I get is the old dreaded "The [RCP] executable launcher was unable to locate its companion shared library" error popup.
First of all I thought I might have set up the CLASS PATH incorrectly, but when I open a console and type javaw or java -version anywhere, it all works.
Also, when I go to the pluginsfolder in the p2 repository for the RCP in the workspace, and double-click on org.eclipse.equinox.launcher_1.2.0.v20110502.jar, the RCP starts, albeit without the splash screen.
This must surely mean my Java set up is correct, and it's not a class path problem?
I'm not sure where this problem might lie (I have a plugin, a feature, a product, a repository, and a parent package with the main pom), so if you let me know your suspicions where the error might come from, I'll be more than happy to post respective XML, build.properties, screenshots and what have you. Unless this is a common error with a common solution.
Many thanks in advance!
Oh yea: Windows 7 (64-bit), JDK and JRE both 64-bit as well, Eclipse EE 3.7.1 (I chose that because it contains the most plugins I'll need later by default).
UPDATE
I'm attaching my CLASS PATH Settings for reference.
User variables
CLASS PATH: C:\Program Files\Java\jdk1.6.0_30;.;
System variables
JAVA_HOME: C:\Program Files\Java\jdk1.6.0_30
Path: %JAVA_HOME%\bin;
UPDATE 2
When I let Tycho create a ZIP file in the p2 repository, and copy that from the repo to another location, unzip it and run the .exe, the application starts without problems. So I guess this query is partially solved, but I'd still be interested to hear why I wouldn't be able to start the application from the repository...

Today I came across the same issue. I guess you could find the solution here: https://bugs.eclipse.org/bugs/show_bug.cgi?id=176084
In short, the problem in my case was, that the org.eclipse.equinox.launcher_1.2.0.v20110502.jar must be unpacked in the plugins folder under the folder name: org.eclipse.equinox.launcher_1.2.0.v20110502
... hope that helps!

In my case the error The [RCP] executable launcher was unable to locate its companion shared library was because my path was too long.

Same issue I was facing from yesterday. Today, I have changed path of project(git clone) and build it and able to run RCP executable.
I think this issue was because of path too long.