java运行时报错。。。谁来帮下。。。

[zqj50]

java运行时报错。。。谁来帮下。。。
用的是Jbuilder
错误代码如下：



Exception in thread "AWT-EventQueue-0" java.lang.UnsupportedClassVersionError: Bad version number in .class file
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
at java.net.URLClassLoader.access$100(URLClassLoader.java:56)
at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:268)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:164)
at dbaccess.DB.<clinit>(DB.java:27)
at dbaccess.UserDAO.getUserIsTrue(UserDAO.java:25)
at ui.FrmLogin.btnLogin_actionPerformed(FrmLogin.java:82)
at ui.FrmLogin_btnLogin_actionAdapter.actionPerformed(FrmLogin.java:107)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1849)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2169)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:420)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:258)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:234)
at java.awt.Component.processMouseEvent(Component.java:5488)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3093)
at java.awt.Component.processEvent(Component.java:5253)
at java.awt.Container.processEvent(Container.java:1966)
at java.awt.Component.dispatchEventImpl(Component.java:3955)
at java.awt.Container.dispatchEventImpl(Container.java:2024)
at java.awt.Component.dispatchEvent(Component.java:3803)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4212)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3892)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3822)
at java.awt.Container.dispatchEventImpl(Container.java:2010)
at java.awt.Window.dispatchEventImpl(Window.java:1774)
at java.awt.Component.dispatchEvent(Component.java:3803)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:463)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)
Exception in thread "AWT-EventQueue-0" java.lang.NoClassDefFoundError
at dbaccess.UserDAO.getUserIsTrue(UserDAO.java:25)
at ui.FrmLogin.btnLogin_actionPerformed(FrmLogin.java:82)
at ui.FrmLogin_btnLogin_actionAdapter.actionPerformed(FrmLogin.java:107)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1849)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2169)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:420)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:258)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:234)
at java.awt.Component.processMouseEvent(Component.java:5488)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3093)
at java.awt.Component.processEvent(Component.java:5253)
at java.awt.Container.processEvent(Container.java:1966)
at java.awt.Component.dispatchEventImpl(Component.java:3955)
at java.awt.Container.dispatchEventImpl(Container.java:2024)
at java.awt.Component.dispatchEvent(Component.java:3803)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4212)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3892)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3822)
at java.awt.Container.dispatchEventImpl(Container.java:2010)
at java.awt.Window.dispatchEventImpl(Window.java:1774)
at java.awt.Component.dispatchEvent(Component.java:3803)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:463)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)
Exception in thread "AWT-EventQueue-0" java.lang.NoClassDefFoundError
at dbaccess.UserDAO.getUserIsTrue(UserDAO.java:25)
at ui.FrmLogin.btnLogin_actionPerformed(FrmLogin.java:82)
at ui.FrmLogin_btnLogin_actionAdapter.actionPerformed(FrmLogin.java:107)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1849)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2169)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:420)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:258)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:234)
at java.awt.Component.processMouseEvent(Component.java:5488)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3093)
at java.awt.Component.processEvent(Component.java:5253)
at java.awt.Container.processEvent(Container.java:1966)
at java.awt.Component.dispatchEventImpl(Component.java:3955)
at java.awt.Container.dispatchEventImpl(Container.java:2024)
at java.awt.Component.dispatchEvent(Component.java:3803)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4212)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3892)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3822)
at java.awt.Container.dispatchEventImpl(Container.java:2010)
at java.awt.Window.dispatchEventImpl(Window.java:1774)
at java.awt.Component.dispatchEvent(Component.java:3803)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:463)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)



谁来帮下哈。。。。

[xlnheapy]

通常这种异常是因为类版本不一样造成的，比如使用高版本jdk（如jdk1.5）编译的类在低版本的jre（比如jre1.4）上运行，就会报这种异常。
建议你检查一下工程中用到的jdk和运行时的jre版本。

[huntor]

1L 正解

[24K純帥]

soga..

[zqj50]

我用的是jbuilder....怎么检查，不会，百度也找不到都是eclipse

[铁匠梁老师]

版本不兼容，编译的JDK版本是运行的JDK版本不一致引起。

[ronniegxq]

[Quote=引用 1 楼 xlnheapy 的回复:]

通常这种异常是因为类版本不一样造成的，比如使用高版本jdk（如jdk1.5）编译的类在低版本的jre（比如jre1.4）上运行，就会报这种异常。
建议你检查一下工程中用到的jdk和运行时的jre版本。
[/Quote]
good

[lhlove271015]

[Quote=引用 1 楼 xlnheapy 的回复:]
通常这种异常是因为类版本不一样造成的，比如使用高版本jdk（如jdk1.5）编译的类在低版本的jre（比如jre1.4）上运行，就会报这种异常。
建议你检查一下工程中用到的jdk和运行时的jre版本。
[/Quote]

正解

[lhlove271015]

看看这个
http://www.21jn.net/html/71/n-571.html

[p2pmm]

通常这种异常是因为类版本不一样造成的

[buzaibeishang4617016]

呵呵，重装jdk吧，楼主别犹豫了

[zqj50]

谁来帮我一下。。。不会哦。。。。就知道我的都是1.5版本的

[zqj50]

我qq249451220

[hellsb]

Bad version number in

[DFDDFEERER]

[Quote=引用 5 楼 foolishdault 的回复:]
版本不兼容，编译的JDK版本是运行的JDK版本不一致引起。
[/Quote]
正确

[wzju64676266]

jdk版本比编译class文件的jdk版本要低，要不重新编译，要不换更高的JDK

[buzaibeishang4617016]

重装jdk，到www.java.sun.com下载最新版本