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This code增加的getBean（）方法，我們使用的是類：MissingMethodException：法無簽名：getBean（）方法重新編譯後
clazz.metaClass.getBean = { String name ->
return VaadinUtils.getBean(name)
}
clazz.metaClass.getBean = { Class type ->
return VaadinUtils.getBean(type)
}
當應用程序啓動時它的工作原理沒有問題，它也存活數重新編譯。重新編譯完成like this：
def reloadedClass = application.classLoader.loadClass(vaadinGrailsClass.clazz.name)
幾個重新編譯後，它說的getBean（）方法缺失和異常被拋出（所以一個個有重新啓動和重新部署正在開發的應用程序）。
Caused by MissingMethodException: No signature of method:
com.myapp.SaveIssueDetailListener.getBean() is applicable for argument types:
(java.lang.Class) values: [class agiletool.core.IssueService]
Possible solutions: getClass(), getForm(), getAt(java.lang.String)
->> 30 buttonClick in com.myapp.SaveIssueDetailListener$$ENRHmYFM
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
512 receiveEvent in com.vaadin.event.ListenerMethod
164 fireEvent . . . . . in com.vaadin.event.EventRouter
1219 fireEvent in com.vaadin.ui.AbstractComponent
550 fireClick . . . . . in com.vaadin.ui.Button
217 changeVariables in ''
1451 changeVariables . . in com.vaadin.terminal.gwt.server.AbstractCommunicationManager
1399 handleVariableBurst in ''
1318 handleVariables . . in ''
763 doHandleUidlRequest in ''
296 handleUidlRequest . in com.vaadin.terminal.gwt.server.CommunicationManager
501 service in com.vaadin.terminal.gwt.server.AbstractApplicationServlet
191 service . . . . . . in com.vaadin.terminal.gwt.server.GrailsAwareApplicationServlet
886 runTask in java.util.concurrent.ThreadPoolExecutor$Worker
908 run . . . . . . . . in ''
680 run in java.lang.Thread
這就是我們稱之爲的getBean（）方法：
public void buttonClick(ClickEvent event) {
UserService userService = getBean(UserService) //...
任何想法可能是錯誤的？