Have problem with deploytool,help,Tx!!!

Hi:
I use deploytool to package ConverterApp followed the J2ee tutorial. But after Compile the file, i New a
new jar in Converter app , add the 3 classes to the Content,I get a error that deploytool told me "Cannot load the class convert.ConvertHome ...........",Why??? I confushed about it, Who can Help me???

I really find the Exception in the log file:
---------------- (DEBUG) Exception ---------------------------------------------
[NewEjbWizard.verifyAddedClasses:716]
Error loading class: converter.Converter
java.lang.UnsupportedClassVersionError: converter/Converter (Unsupported major.minor version 49.0)
java.lang.UnsupportedClassVersionError: converter/Converter (Unsupported major.minor version 49.0)
     at java.lang.ClassLoader.defineClass0(Native Method)
     at java.lang.ClassLoader.defineClass(ClassLoader.java:537)
     at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)
     at com.sun.enterprise.tools.deployment.ui.utils.J2EEClassLoader.findClass(J2EEClassLoader.java:529)
     at com.sun.enterprise.tools.deployment.ui.utils.DTClassLoader.findClass(DTClassLoader.java:424)
     at java.lang.ClassLoader.loadClass(ClassLoader.java:289)
     at com.sun.enterprise.tools.deployment.ui.utils.DTClassLoader._loadClass(DTClassLoader.java:381)
     at com.sun.enterprise.tools.deployment.ui.utils.DTClassLoader.loadClass(DTClassLoader.java:399)
     at java.lang.ClassLoader.loadClass(ClassLoader.java:235)
     at com.sun.enterprise.tools.deployment.ui.utils.DTClassLoader.loadClass(DTClassLoader.java:345)
     at com.sun.enterprise.tools.deployment.ui.ejb.NewEjbWizard.verifyAddedClasses(NewEjbWizard.java:712)
     at com.sun.enterprise.tools.deployment.ui.ejb.NewEjbWizard.validateComponent(NewEjbWizard.java:980)
     at com.sun.enterprise.tools.deployment.ui.utils.Wizard._performValidation(Wizard.java:711)
     at com.sun.enterprise.tools.deployment.ui.utils.Wizard._goForward(Wizard.java:724)
     at com.sun.enterprise.tools.deployment.ui.utils.Wizard$1.actionPerformed(Wizard.java:177)
     at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1786)
     at javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(AbstractButton.java:1839)
     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:245)
     at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:231)
     at java.awt.Component.processMouseEvent(Component.java:5100)
     at java.awt.Component.processEvent(Component.java:4897)
     at java.awt.Container.processEvent(Container.java:1569)
     at java.awt.Component.dispatchEventImpl(Component.java:3615)
     at java.awt.Container.dispatchEventImpl(Container.java:1627)
     at java.awt.Component.dispatchEvent(Component.java:3477)
     at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:3483)
     at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3198)
     at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3128)
     at java.awt.Container.dispatchEventImpl(Container.java:1613)
     at java.awt.Window.dispatchEventImpl(Window.java:1606)
     at java.awt.Component.dispatchEvent(Component.java:3477)
     at java.awt.EventQueue.dispatchEvent(EventQueue.java:456)
     at com.sun.enterprise.tools.deployment.ui.utils.UIEventQueue.dispatchEvent(UIEventQueue.java:168)
     at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:201)
     at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)
     at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:141)
     at java.awt.Dialog$1.run(Dialog.java:540)
     at java.awt.Dialog.show(Dialog.java:561)
     at com.sun.enterprise.tools.deployment.ui.utils.UIDialog._showDialog(UIDialog.java:373)
     at com.sun.enterprise.tools.deployment.ui.utils.UIDialog.show(UIDialog.java:432)
     at com.sun.enterprise.tools.deployment.ui.utils.Wizard.show(Wizard.java:621)
     at com.sun.enterprise.tools.deployment.ui.utils.Wizard.show(Wizard.java:584)
     at com.sun.enterprise.tools.deployment.ui.ejb.NewEjbWizard.show(NewEjbWizard.java:558)
     at com.sun.enterprise.tools.deployment.ui.ejb.NewEjbWizard._showWizard(NewEjbWizard.java:282)
     at com.sun.enterprise.tools.deployment.ui.ejb.NewEjbWizard.newModule(NewEjbWizard.java:265)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:324)
     at com.sun.enterprise.tools.deployment.ui.utils.UIActionDispatcher.invoke(UIActionDispatcher.java:371)
     at com.sun.enterprise.tools.deployment.ui.shared.ModuleManagerImpl.createNewModule(ModuleManagerImpl.java:229)
     at com.sun.enterprise.tools.deployment.ui.DeployToolWindow.createNewModule(DeployToolWindow.java:1811)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:324)
     at com.sun.enterprise.tools.deployment.ui.utils.UIActionDispatcher.invoke(UIActionDispatcher.java:371)
     at com.sun.enterprise.tools.deployment.ui.utils.UIActionDispatcher.invoke(UIActionDispatcher.java:393)
     at com.sun.enterprise.tools.deployment.ui.utils.UIActionDispatcher.actionPerformed(UIActionDispatcher.java:476)
     at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1786)
     at com.sun.enterprise.tools.deployment.ui.utils.UIMenu$UIMenuItem.fireActionPerformed(UIMenu.java:436)
     at javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(AbstractButton.java:1839)
     at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:420)
     at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:258)
     at javax.swing.AbstractButton.doClick(AbstractButton.java:289)
     at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:1113)
     at javax.swing.plaf.basic.BasicMenuItemUI$MouseInputHandler.mouseReleased(BasicMenuItemUI.java:943)
     at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:231)
     at java.awt.Component.processMouseEvent(Component.java:5100)
     at java.awt.Component.processEvent(Component.java:4897)
     at java.awt.Container.processEvent(Container.java:1569)
     at java.awt.Component.dispatchEventImpl(Component.java:3615)
     at java.awt.Container.dispatchEventImpl(Container.java:1627)
     at java.awt.Component.dispatchEvent(Component.java:3477)
     at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:3483)
     at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3198)
     at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3128)
     at java.awt.Container.dispatchEventImpl(Container.java:1613)
     at java.awt.Window.dispatchEventImpl(Window.java:1606)
     at java.awt.Component.dispatchEvent(Component.java:3477)
     at java.awt.EventQueue.dispatchEvent(EventQueue.java:456)
     at com.sun.enterprise.tools.deployment.ui.utils.UIEventQueue.dispatchEvent(UIEventQueue.java:168)
     at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:201)
     at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)
     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:145)
     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:137)
     at java.awt.EventDispatchThread.run(EventDispatchThread.java:100)
[Wizard._goForward:727] Validation failed, 'goForward' ignored.

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