Question

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:Windowssystem32>CD C:UsersgurukripaDocumentsNetBeansProjectsI-ROOMdist


    C:UsersgurukripaDocumentsNetBeansProjectsI-ROOMdist>java -jar iroom.jAR
    Unable to access jarfile iroom.jAR

    C:UsersgurukripaDocumentsNetBeansProjectsI-ROOMdist>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:UsersgurukripaDocumentsNetBeansProjectsI-ROOMdist>

我用的是:

Netbeans 7.0,
JDK 1.7.0_02,
JRE 7
Windows 7 32-bit Home Premium

当我双击罐子时没有发生任何情况, 但我可以看到任务管理器正在运行 < code>javaaw 。是否有合理的理由?

Answer 1

您的 JAR 编译的 JDK 版本与您试图运行的版本不同。确保 Netbeans 和命令行都使用 JDK 的相同版本。

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