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

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)

Answer 1

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

Answer 2

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.