Inside one of my Netbeans projects, as jar is built and run perfectly.
However, when the same project is cleaned & built, the lib folder is absent from dist
and the generated jar does not run and produces the following CMD prompt message:
Microsoft Windows [Version 6.1.7600]
Copyright (c) 2009 Microsoft Corporation. All rights reserved.
C:\Windows\system32>CD C:\Users\gurukripa\Documents\NetBeansProjects\I-ROOM\dist
C:\Users\gurukripa\Documents\NetBeansProjects\I-ROOM\dist>java -jar iroom.jAR
Unable to access jarfile iroom.jAR
C:\Users\gurukripa\Documents\NetBeansProjects\I-ROOM\dist>java -jar I-ROOM.jar
Exception in thread "main" java.lang.UnsupportedClassVersionError: i/room/Essent
ials (Unsupported major.minor version 51.0)
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:539)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:12
3)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:251)
at java.net.URLClassLoader.access$100(URLClassLoader.java:55)
at java.net.URLClassLoader$1.run(URLClassLoader.java:194)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:187)
at java.lang.ClassLoader.loadClass(ClassLoader.java:289)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:274)
at java.lang.ClassLoader.loadClass(ClassLoader.java:235)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302)
C:\Users\gurukripa\Documents\NetBeansProjects\I-ROOM\dist>
I am using:
- Netbeans 7.0,
- JDK 1.7.0_02,
- JRE 7
- Windows 7 32-bit Home Premium
When I double-click on the jar nothing happens, but I can see javaaw is running in task manager. Is there a valid reason for this?