GWT UIBinding 找不到零参数构造函数
我正在尝试新的 GWT 2.0 UIBinder 功能，并且我有一个如下所示的 ui XML：
<ui:UiBinder xmlns:ui="urn:ui:com.google.gwt.uibinder" xmlns:g="urn:import:com.google.gwt.user.client.ui" xmlns:my='urn:import:com.mystuff.mypackage'>
<g:VerticalPanel>
<!-- other stuff -->
<my:FileUploadPanel.ValidatingFileUpload styleName="field" ui:field="fileUpload" />
</g:VerticalPanel>
ValidatingFileUpload 是 FileUploadPanel 中包含的非静态内部类，它扩展了 FileUpload GWT 类。它有一个显式的零参数构造函数，只需调用 super()。但是，当 GWT 启动时，我收到此错误：
00:00:18.359 [ERROR] Rebind result 'com.mystuff.mypackage.FileUploadPanel.ValidatingFileUpload' has no default (zero argument) constructors.
java.lang.NoSuchMethodException: com.mystuff.mypackage.FileUploadPanel$ValidatingFileUpload.<init>()
知道这里可能出了什么问题吗？
I'm trying my hand at the new GWT 2.0 UIBinder capability, and I have a ui XML that looks like this:
<ui:UiBinder xmlns:ui="urn:ui:com.google.gwt.uibinder" xmlns:g="urn:import:com.google.gwt.user.client.ui" xmlns:my='urn:import:com.mystuff.mypackage'>
<g:VerticalPanel>
<!-- other stuff -->
<my:FileUploadPanel.ValidatingFileUpload styleName="field" ui:field="fileUpload" />
</g:VerticalPanel>
ValidatingFileUpload is a non-static inner class contained in FileUploadPanel that extends the FileUpload GWT class. It has an explicit zero-arg constructor that simply calls super(). However, when GWT starts up, I get this error:
00:00:18.359 [ERROR] Rebind result 'com.mystuff.mypackage.FileUploadPanel.ValidatingFileUpload' has no default (zero argument) constructors.
java.lang.NoSuchMethodException: com.mystuff.mypackage.FileUploadPanel$ValidatingFileUpload.<init>()
Any idea what might be going wrong here?
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非静态内部类需要在其包含类的实例中实例化。这会阻止 UiBinder 在需要时实例化它。尝试使用静态嵌套类。
A non-static inner class needs to be instantiated within an instance of its containing class. This prohibits UiBinder from instantiating it when needed. Try using a static nested class instead.