how to run or install a *.jar file in windows?

Question

I have downloaded jbpm-installer-3.2.7.jar but I don't know how to install or run the file.

If I double click on it, it opens in winrar. I tried installing through command prompt, but I got the following errors:

C:\Documents and Settings\ccuser\Desktop\manoj>java -jar jbpm-installer-3.2.7.jar

Exception in thread "main" java.lang.UnsupportedClassVersionError: com/izforge/izpack/installer/Installer (Unsupported major.minor version 49.0)
    at java.lang.ClassLoader.defineClass0(Native Method)
    at java.lang.ClassLoader.defineClass(Unknown Source)
    at java.security.SecureClassLoader.defineClass(Unknown Source)
    at java.net.URLClassLoader.defineClass(Unknown Source)
    at java.net.URLClassLoader.access$100(Unknown Source)
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClassInternal(Unknown Source)

Here is something useful: https://gist.github.com/djangofan/4144970 — djangofan, Mar 12 '13 at 20:57

score 26 · Answer 1 · answered Aug 18 '10 at 14:37

26

Have you tried (from a command line)

java -jar jbpm-installer-3.2.7.jar

or double clicking it with the mouse ?

Found this and this by googling.

Hope it helps

answered Aug 18 '10 at 14:37

Tom

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if i double click it, it is opening in winrar!. wrong file association, i guess. – brainless Aug 18 '10 at 14:41
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A jar file equivilent to a zip file, which is why winrar will have opened it, the association is not *wrong* per se, just in this case you want to execute the code within the jar – Jon Freedman Aug 18 '10 at 14:45
@brainless Try looking at the first link I posted. – Tom Aug 18 '10 at 14:45
Running with the -jar option in a console opened as admin worked for me! – Marcell Nov 22 '16 at 08:24

score 11 · Accepted Answer · answered Aug 18 '10 at 15:12

The UnsupportedClassVersionError means that you are probably using (installed) an older version of Java as used to create the JAR.
Go to java.sun.com page, download and install a newer JRE (Java Runtime Environment).
if you want/need to develop with Java, you will need the JDK which includes the JRE.

Dean · Answer 3 · 2010-08-18T14:46:58.503

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To run usually click and it should run, that is if you have java installed. If not get java from here Sorry thought it was more general open a command prompt and type java -jar jbpm-installer-3.2.7.jar

edited Aug 18 '10 at 14:46

answered Aug 18 '10 at 14:38

Dean

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score 1 · Answer 4 · answered Aug 18 '10 at 19:22

If double-clicking on it brings up WinRAR, you need to change the program you are running it with. You can right-click on it and click "Open with". Java should be listed in there.

However, you must first upgrade your Java version to be compatible with that JAR.

score 0 · Answer 5 · answered Aug 18 '10 at 14:43

0

Open up a command prompt and type java -jar jbpm-installer-3.2.7.jar

answered Aug 18 '10 at 14:43

mocybin

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How does that differ from @Tom's earlier answer? – Kalle Richter Dec 26 '16 at 18:23

how to run or install a *.jar file in windows?

5 Answers5