Develop Reference

Code runs but doesn't open when converted to .jar file? [duplicate]

I want to execute my program without using an IDE.
I've created a jar file and an exectuable jar file. When
I double click the exe jar file, nothing happens, and when I try to use the command in cmd it gives me this:
Error: Unable to access jarfile <path>
I use the command: java -jar Calculator.jar
How I created the jar:
Right click on project folder (Calculator)
Select
Click on Java Folder and select "Exectuable Jar File", then select next
Launch Configuration: Main - Calculator
Create Export Destination
Hit "Finish" and profit! Well, not really.

I had encountered this issue when I had run my Jar file as
java -jar TestJar
instead of
java -jar TestJar.jar
Missing the extension .jar also causes this issue.

Fixed
I just placed it in a different folder and it worked.

[Possibly Windows only]
Beware of spaces in the path, even when your jar is in the current working directory. For example, for me this was failing:
java -jar myjar.jar
I was able to fix this by givng the full, quoted path to the jar:
java -jar "%~dp0\myjar.jar"
Credit goes to this answer for setting me on the right path....

I had this issue under CygWin in Windows. I have read elsewhere that Java does not understand the CygWin paths (/cygdrive/c/some/dir instead of C:\some\dir) - so I used a relative path instead: ../../some/dir/sbt-launch.jar.

I had the same issue when trying to launch the jar file. The path contained a space, so I had to place quotes around. Instead of:
java -jar C:\Path to File\myJar.jar
i had to write
java -jar "C:\Path to File\myJar.jar"

Just came across the same problem trying to make a bad USB...
I tried to run this command in admin cmd
java -jar c:\fw\ducky\duckencode.jar -I c:\fw\ducky\HelloWorld.txt -o c:\fw\ducky\inject.bin
But got this error:
Error: unable to access jarfile c:\fw\ducky\duckencode.jar
Solution
1st step
Right click the jarfile in question. Click properties.
Click the unblock tab in bottom right corner.
The file was blocked, because it was downloaded and not created on my PC.
2nd step
In the cmd I changed the directory to where the jar file is located.
cd C:\fw\ducky\
Then I typed dir and saw the file was named duckencode.jar.jar
So in cmd I changed the original command to reference the file with .jar.jar
java -jar c:\fw\ducky\duckencode.jar.jar -I c:\fw\ducky\HelloWorld.txt -o c:\fw\ducky\inject.bin
That command executed without error messages and the inject.bin I was trying to create was now located in the directory.
Hope this helps.

None of the provided answers worked for me on macOS 11 Big Sur. The problem turned out to be that programs require special permission to access the Desktop, Documents, and Downloads folders, and Java breaks both the exception for directly opened files and the permission request popup.
Fixes:
Move the .jar into a folder that isn’t (and isn’t under) Documents, Desktop, or Downloads.
Manually grant the permission. Go to System Preferences → Security and Privacy → Privacy → Files and Folders → java, and check the appropriate folders.

I had a similar problem and I even tried running my CMD with administrator rights, but it did not solve the problem.
The basic thing is to make sure to change the Directory in cmd to the current directory where your jar file is.
Do the following steps:
Copy jar file to Desktop.
Run CMD
Type command cd desktop
Then type java -jar filename.jar
This should work.
Edit: From JDK-11 onwards ( JEP 330: Launch Single-File Source-Code Programs )
Since Java 11, java command line tool has been able to run a single-file source-code directly. e.g.
java filename.java

If you are using OSX, downloaded files are tagged with a security flag that prevents unsigned applications from running.
to check this you can view extended attributes on the file
$ ls -l#
-rw-r--r--# 1 dave staff 17663235 13 Oct 11:08 server-0.28.2-java8.jar
com.apple.metadata:kMDItemWhereFroms 619
com.apple.quarantine 68
You can then clear the attributes with
xattr -c file.jar

It can also happen if you don't properly supply your list of parameters. Here's what I was doing:
java -jar test#gmail.com testing_subject file.txt test_send_emails.jar
Instead of the correct version:
java -jar test_send_emails.jar test#gmail.com testing_subject file.txt

This worked for me.
cd /path/to/the/jar/
java -jar ./Calculator.jar

For me it happens if you use native Polish chars in foldername that is in the PATH.
So maybe using untypical chars was the reason of the problem.

sometime it happens when you try to (run or create) a .jar file under /libs folder by right click it in android studio. you can select the dropdown in top of android stuio and change it to app. This will work

My particular issue was caused because I was working with directories that involved symbolic links (shortcuts). Consequently, trying java -jar ../../myJar.jar didn't work because I wasn't where I thought I was.
Disregarding relative file paths fixed it right up.

In my case the suggested file name to be used was jarFile*.jar in the command line. The file in the folder was jarFile-1.2.3.jar . So I renamed the file to jarFile. Then I used jarFile.jar instead of jarFile*.jar and then the problem got resolved

It can happen on a windows machine when you have spaces in the names of the folder. The solution would be to enter the path between " ".
For example:
java -jar c:\my folder\x.jar -->
java -jar "c:\my folder\x.jar"

To avoid any permission issues, try to run it as administrator. This worked for me on Win10.

I know this thread is years ago and issue was fixed too. But I hope this would helps someone else in future since I've encountered some similar issues while I tried to install Oracle WebLogic 12c and Oracle OFR in which its installer is in .jar format. For mine case, it was either didn't wrap the JDK directory in quotes or simply typo.
Run Command Prompt as administrator and execute the command in this format. Double check the sentence if there is typo.
"C:\Program Files\Java\jdk1.xxxxx\bin\java" -jar C:\Users\xxx\Downloads\xxx.jar
If it shows something like JRE 1.xxx is not a valid JDK Java Home, make sure the System variables for JAVA_HOME in Environment Variables is pointing to the correct JDK directory. JDK 1.8 or above is recommended (2018).
A useful thread here, you may refer it: Why its showing your JDK c:program files\java\jre7 is not a valid JDK while instaling weblogic server?

For me it happen because i run it with default java version (7) and not with compiled java version (8) used to create this jar.
So i used:
%Java8_64%\bin\java -jar myjar.jar
Instead of java 7 version:
java -jar myjar.jar

I had a similar problem where TextMate or something replaced the double quotes with the unicode double quotes.
Changing my SELENIUM_SERVER_JAR from the unicode double quotes to regular double quotes and that solved my problem.

this is because you are looking for the file in the wrong path
1. look for the path of the folder where you placed the file
2. change the directory cd in cmd use the right path

I use NetBeans and had the same issue. After I ran build and clean project my program was executable. The Java documentation says that the build/clean command is for rebuilding the project from scratch basically and removing any past compiles. I hope this helps. Also, I'd read the documentation. Oracle has NetBeans and Java learning trails. Very helpful. Good luck!

Maybe you have specified the wrong version of your jar.

I finally pasted my jar file into the same folder as my JDK so I didn't have to include the paths. I also had to open the command prompt as an admin.
Right click Command Prompt and "Run as administrator"
Navigate to the directory where you saved your jdk to
In the command prompt type: java.exe -jar <jar file name>.jar

Keep the file in same directory where you are extracting it. That worked for me.

This is permission issue, see if the directory is under your User.
That's why is working in another folder!

Rename the jar file and try
Explanation :
yes, I know there are many answers still I want to add one point here which I faced.
I built the jar and I moved it into the server where I deploy (This is the normal process)
here the file name which I moved already existed in the server, here the file will override obviously right. In this case, I faced this issue.
maybe at the time of overriding there can be a permission copy issue.
Hope this will help someone.

Have you tried to run it under administrator privoleges?
meaning, running the command in "Run As" and then select administrator with proper admin credentials
worked for me

I was trying this:
After giving the file read, write, execute priviledges:
chmod 777 java-repl.jar
alias jr="java -jar $HOME/Dev/java-repl/java-repl.jar"
Unable to access bla bla..., this was on Mac OS though
So I tried this:
alias jr="cd $HOME/Dev/java-repl/ && java -jar java-repl.jar"

This did not work "Unable to access jarfile"
"C:\Program Files\java\jdk-13+33-jre\bin\javaw.exe" -jar "C:\Program Files\Maxim Integrated Products\1-Wire Drivers x64\ OneWireViewer.jar"
This does work
"C:\Program Files\java\jdk-13+33-jre\bin\javaw.exe" -jar "C:\Program Files\Maxim Integrated Products\1-Wire Drivers x64\OneWireViewer.jar"
The difference is the single space in front of OneWireViewer.jar not withstanding that it is surrounded with quotes and even has other spaces.

Program does not execute properly when double clicked. "A JNI error has occurred, please check your installation and try again."

I am trying to get a simple guessing game to run when I click the desktop icon. The game prompts the user for inputs in the command window. The program does not have a real user interface aside from one dialogue box. I understand that opening jar files using "javaw.exe" does not open command prompt programs, so I added a dialogue box just to have some indication that it was being opened.
The name of the jar is "guessme.jar"
I have gotten the jar to run properly from the command window by navigating to the proper directory and then issuing the following command :
java -jar guessme.jar
I would expect double clicking the icon would open my dialogue box.
However, when I try to open the jar using a double click, I get the following error:
A JNI error has occurred, please check your installation and try again.
Then I get another dialogue box which says:
A Java Exception has occurred.
I am using JDK 13.0.1.
I made sure that the bin is at the top of the class path. I checked that the system was compiling with the correct version of Java.
Issuing java -version yields 13.0.1.
Issuing javac -version also yields 13.0.1.
I wrote the program in Eclipse. I archived the file using the command prompt.
My package name does not include java or any such keywords. Its just my email.
I have looked around and did not find anyone else who had the same issue. Thank you.

Java Windows. why can I run a jar file on command prompt but not double clicking it

Now on this machine earlier just typing in the command prompt:
java
resulted in the command prompt saying java wasn't recognized.
now the machine does have java installed , so I just added the java home and javahome/bin to path. and now pressing java causes java to be recognized but
by double clicking a jar file, but I am not getting the software to run. But when I go to command prompt and type in the prompt "java -jar nameofJar.jar" the application runs fine. Not sure what is the issue. I added the environment variables to make sure it targets the jar file. I do notice something its not seeing the jar file as a "Executable jar file" simple a "jar file".

You have to tell java to execute your file with javaw.exe as told by #Carcigenicate
Start "Control Panel"
Click "Default Programs"
Click "Associate a file type or protocol with a specific program"
Double click .jar
Browse C:\Program Files\Java\jre7\bin\javaw.exe
Click the button Open
Click the button OK

How to stop a program run to times to times when click on it (java)

Java bin/jar when I double clicked on it first time it opens but again double-clicked on it. it appears the same window like the first one and it open it multiple times how can I stop it. I just want a solution that how can I open a jar like a professional software.
Sorry for my bad english

First check that Java is installed on your machine, by typing "java -version"
If java is installed then you need to goto under that folder where the jar file is present.
Type command "java -jar "
In the above command type your file name in place of

jar file doesn't open upon double click

When I double click the jar file, the GUI program doesn't start by itself. Instead I have to open the Command prompt and then type java -jar abc.jar and only then it starts up. Why is that? What do I need to do to avoid this?
Is it that I have some problem with the default jar file opener? What should be the jar file opener?

if nothing happens, then don't you get any error message like could not find main class or something similar?
I would suggest check your jar file association. On command-line type:
ftype | find "jarfile"
Sometimes, even resetting it works, find out the absolute path of JRE and run the command:
ftype jarfile="C:\Program Files\Java\jre7\bin\javaw.exe" -jar "%1" %*
This would most probably solve your problem.

Maybe you would like to follow the instructions in this post: Running JAR file on Windows.
Just a minor note though. The exact syntax for me to work was in my Windows XP:
C:\Program Files\Java\j2re1.4.2_04\bin\javaw.exe -jar "%1" %

If your jar file opens successfully from the cmd line means its a correct jar and everything is in place. Now you have to associate the correct program with it.
Right click on the jar -> Open With -> Go to JRE/BIN/javaw.exe -> OK
Now all the jar files are associated with the correct program. Try now!

I had this same problem. In my case, I think it was because I was using Scanner(system.in) input.
By default, Windows opens .jar files with javaw.exe (thanks Johnydep), the version of java that runs without a terminal.
In my case, running javaw -jar myJar.jar didn't work either.
I ended up writing a tiny batch file that uses the regular java.exe: java -jar myJar.jar

Which operating system? You need to configure your default applications. In KDE this is under System Settings -> Default Applications. For Gnome, Mac, or Windows you will have to google to find where to set it.

On windows: right click on jar -> open with -> choose programm... -> select "Java (TM) Platform SE binary".
Optionally, check the "Always use the selected programm to open this kind of file".

Navigate to:
File->export->Java->Jar file->Next->use the tree to select the files you want to be included in your jar->Next->Next->
now i guess comes the part you have missed
at the bottom under "Main Class" click "Browse"->selcet the class you want to run when double click->press ok->finish.
should work now.
I couldn't find this answer anywhere and it solved my problem after i had same issue.

I had the same problem in Linux with a jar generated by Intellij, and I find that it's the problem of permission, the jar file's permission is
"-rw-rw-r--", you need to add the permission of execute:
$chmod +x xx.jar, and double click.

Maybe it is because your jar is not an executable jar due to which you cannot execute it directly by double clicking on it.