问题
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.
回答1:
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.
回答2:
Fixed
I just placed it in a different folder and it worked.
回答3:
[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....
回答4:
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.
回答5:
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.
回答6:
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"
回答7:
This worked for me
java -jar "filename.jar"
回答8:
I had similar problem and i even tried running my CMD with administrator rights, but it did not solved the problem.
The basic thing is that make sure to change the Directory in cmd to current directory where your jar file is.
Do following steps:
1.Copy jar file to Desktop.
Run CMD
type command
cd desktpthen 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
回答9:
This worked for me.
cd /path/to/the/jar/
java -jar ./Calculator.jar
回答10:
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
回答11:
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
回答12:
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
回答13:
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.
回答14:
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.
回答15:
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
回答16:
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"
回答17:
To avoid any permission issues, try to run it as administrator. This worked for me on Win10.
回答18:
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?
回答19:
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.
回答20:
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
回答21:
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!
回答22:
Maybe you have specified the wrong version of your jar.
回答23:
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
回答24:
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"
回答25:
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.
回答26:
first I created a variable %JAVA_HOME% :
When you downloaded the file, make sure to check UNBLOCK TAB in file properties as shown above in "maartencls" post .
c:\users\my user\downloads\location of the file\all> java -jar yourfilename.jar
hope this will resolve the issue :)
回答27:
In my issue to access directory from Command line (in windows) this error
"unnable to access ..."
because wrong file extension
file.jar.jar
! , so change it to correct one
file.jar
:) good luck
来源：https://stackoverflow.com/questions/11943948/what-causes-unable-to-access-jarfile-error