jar error - could not find or load main class

Question

I tried to put HelloWorld in a  jar file and running it  but it doesn t work  I created the java file and typed in the program  and then wrote in cmd   javac HelloWorld java java HelloWorld   and it worked  Then I entered  echo Main-Class  HelloWorld  gt manifest txt jar cvfm HelloWorld jar manifest txt HelloWorld class   and got the output  added manifest adding  HelloWorld class in   426   out  288  deflated 32     I then entered  java -jar HelloWorld jar HelloWorld jar   and the first line worked  while the second line gave me an error   Error  Could not find or load main class path HelloWorld jar   which is the same output I got  in a rapidly closing window  when I tried to open it with the java exe file in 64 bit jre7 bin  jdk1 7 0 51 bin  jdk1 7 0 51 jre bin  as well as 32 bit jre7 bin  I ve uninstalled and reinstalled both my jre and jdk and recreated my  class and  jar files  but the problem persists  I m on win8   Edit  I tried to do as aetheria suggested  but no luck  I put HelloWorld java in path com stackoverflow user blrp  compiled it  and it worked by entering  java com stackoverflow user blrp HelloWorld   in path  I then created the manifest and jar by    echo Manifest-Version  1 0 echo Class-Path    echo Main-Class  com stackoverflow user blrp HelloWorld   gt manifest txt jar cvfm HelloWorld jar manifest txt com stackoverflow user blrp HelloWorld class   and got the output  added manifest adding  com stackoverflow user blrp HelloWorld class in   454   out  312  deflat ed 31     but still  java -jar HelloWorld jar worked and HelloWorld jar didn t  same error   I also tried not doing the package thing  just the Class-Path in manifest  same result    Also  I solved the problem prior to asking the question by use of a  bat file  but it d still be sweet to get that jar working

User · Answer

I found this question when I was looking for the answer to the above question   But in my case the issue was the use of an  en dash  rather than a  dash    Check which dash you are using  it might be the wrong one   I hope this answer speeds up someone else s search  a comment like this could have saved me a bit of time

User · Answer

Had this problem couldn t find the answer so i went looking on other threads  I found that i was making my app with 1 8 but for some reason my jre was out dated even though i remember updating it  I downloaded the lastes jre 8 and the jar file runs perfectly  Hope this helps

User · Answer

I Faced the same issue while installing a setup using a jar file  Solution thta worked for me is    open command prompt as administrator Go to jdk bin directory  Ex C  Program Files Java jdk1 8 0 73 bin  now execute java -jar  lt  lt jar fully qualified path gt  gt    It worked for me

User · Answer

You can always run this   java -cp HelloWorld jar HelloWorld   -cp HelloWorld jar adds the jar to the classpath  then HelloWorld runs the class you wrote   To create a runnable jar with a main class with no package  add Class-Path    to the manifest   Manifest-Version  1 0 Class-Path    Main-Class  HelloWorld   I would advise using a package to give your class its own namespace  E g   package com stackoverflow user blrp   public class HelloWorld

User · Answer

Thanks jbaliuka for the suggestion  I opened the registry editor  by typing regedit in cmd  and going to HKEY CLASSES ROOT   jarfile   shell   open   command  then opening  Default  and changing the value from   C  Program Files Java jre7 bin javaw exe  -jar   1      to    C  Program Files Java jre7 bin java exe  -jar   1       I just removed the w in javaw exe   After that you have to right click a jar -  open with -  choose default program -  navigate to your java folder and open  jre7 bin java exe  or any other java exe file in you java folder   If it doesn t work  try switching to javaw exe  open a jar file with it  then switch back   I don t know anything about editing the registry except that it s dangerous  so you might wanna back it up before doing this  in the top bar  File Export

[java] .jar error - could not find or load main class

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