Java Lwuit虚拟键盘错误

当我点击键盘上的某个东西时，这个错误就出现了

java.lang.NullPointerException
    at com.sun.lwuit.VirtualKeyboard.actionCommand(+81)
    at com.sun.lwuit.Form.actionCommandImpl(+81)
    at com.sun.lwuit.Button.fireActionEvent(+47)
    at com.sun.lwuit.Button.released(+11)
    at com.sun.lwuit.Button.pointerReleased(+14)
    at com.sun.lwuit.Form.pointerReleased(+186)
    at com.sun.lwuit.Dialog.pointerReleased(+6)
    at com.sun.lwuit.VirtualKeyboard.pointerReleased(+19)
    at com.sun.lwuit.Component.pointerReleased(+10)
    at com.sun.lwuit.Display.handleEvent(+151)
    at com.sun.lwuit.Display.edtLoopImpl(+118)
    at com.sun.lwuit.Display.invokeAndBlock(+84)
    at com.sun.lwuit.Display.invokeAndBlock(+6)
    at com.sun.lwuit.Form.showModal(+416)
    at com.sun.lwuit.Dialog.showModal(+86)
    at com.sun.lwuit.Dialog.show(+89)
    at com.sun.lwuit.Dialog.showPacked(+411)
    at com.sun.lwuit.VirtualKeyboard.show(+7)
    at com.sun.lwuit.Dialog.showDialog(+9)
    at com.sun.lwuit.VirtualKeyboard.showKeyboard(+135)
    at com.sun.lwuit.Display.setShowVirtualKeyboard(+23)
    at com.sun.lwuit.TextArea.pointerReleased(+25)
    at com.sun.lwuit.TextField.pointerReleased(+189)
    at com.sun.lwuit.Form.pointerReleased(+186)
    at com.sun.lwuit.Component.pointerReleased(+10)
    at com.sun.lwuit.Display.handleEvent(+151)
    at com.sun.lwuit.Display.edtLoopImpl(+118)
    at com.sun.lwuit.Display.mainEDTLoop(+208)
    at com.sun.lwuit.RunnableWrapper.run(+245)

它甚至在LWUITDemo.jar中也不起作用……有什么解决方案吗

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或者是否仍要禁用midlet中的虚拟键盘此问题特定于LWUIT designer的当前版本，将在即将进行的更新中修复

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您遇到的编译问题是由于使用了UI项目，而不是使用了适当的端口（例如MIDP/UI项目）。

我在LWUIT演示版和LWUIT的最新SVN中都没有看到这一点。通过将默认VKB设置为null，您始终可以禁用LWUIT VKB，但我们不建议这样做，因为在适用的情况下，它还将禁用本机VKB。如果您可以使用SE端口复制它，并将行号更新为LWUIT代码中的实际行号，则可能会提供更多信息。在svn trunk designer演示中，kvb本身显示错误，我是指trunk/www/designeri compiled/trunk/UI中的资源编辑器，现在使用它。我收到以下错误java.lang.NoClassDefFoundError：com/sun/lwuit/impl/impl/ImplementationFactory位于com.sun.lwuit.Display.init（+28）com.lic.mobile.ui.Main.startApp（+4）javax.microedition.midlet.midleproxy.startApp（+7）com.sun.midp.midlet.Scheduler（+270）com.sun.midp.Main.runLocalClass（+28）com.sun.midp.Main.Main（+80）