问题Wicket RuntimeException

Question

我在Wicket应用程序中找出RuntimeException的原因有困难。我设置了许多断点，但在提交表单时，只有在加载表单时，没有一个断点会触发。这是堆栈：

WicketMessage:未为类定义get方法:类this.is.my.class.WicketDocumentModel表达式: DocumentUpload 根本原因： 没有为类定义get方法:类this.is.my.class.WicketDocumentModel表达式: org.apache.wicket.util.lang.PropertyResolver.getObjectAndGetSetter(PropertyResolver.java:287) at org.apache.wicket.util.lang.PropertyResolver.getObjectAndGetSetter(PropertyResolver.java:287) at org.apache.wicket.util.lang.PropertyResolver.getValue(PropertyResolver.java:90) at org.apache.wicket.model.AbstractPropertyModel.getObject(AbstractPropertyModel.java:117) at org.apache.wicket.Component.getDefaultModelObject中的DocumentUpload( org.apache.wicket.Component$3.compare(Component.java:548) at org.apache.wicket.Component.setDefaultModelObject(Component.java:3049) at org.apache.wicket.markup.html.form.FormComponent.updateModel(FormComponent.java:1168) at org.apache.wicket.markup.html.form.upload.FileUploadField.updateModel(FileUploadField.java:100) at org.apache.wicket.markup.html.form.Form$FormModelUpdateVisitor.component(Form.java:225) at org.apache.wicket.markup ).html.form.FormComponent.visitComponentsPostOrderHelper(FormComponent.java:514) at org.apache.wicket.markup.html.form.FormComponent.visitComponentsPostOrderHelper(FormComponent.java:493) at org.apache.wicket.markup.html.form.FormComponent.visitComponentsPostOrder(FormComponent.java:465) at org.apache.wicket.markup.html.form.Form.internalUpdateFormComponentModels(Form.java:2051) at org.apache.wicket.markup.html.form.Form.updateFormComponentModels(Form.java:2019) at org.apache.wicket.markup.html.form.org.apache.wicket.markup.html.form.Form.process(Form.java:911)，org.apache.wicket.markup.html.form.Form.onFormSubmitted(Form.java:876)，java.lang.reflect.Method.invoke(Method.java:597)，org.apache.wicket.RequestListenerInterface.invoke(RequestListenerInterface.java:182)，org.apache.wicket.request.target.component.listener.ListenerInterfaceRequestTarget.processEvents(ListenerInterfaceRequestTarget.java:73)，org.apache。wicket.request.AbstractRequestCycleProcessor.processEvents(AbstractRequestCycleProcessor.java:92) at org.apache.wicket.RequestCycle.processEventsAndRespond(RequestCycle.java:1250) at org.apache.wicket.RequestCycle.step(RequestCycle.java:1329) at org.apache.wicket.RequestCycle.steps(RequestCycle.java:1428) at org.apache.wicket.RequestCycle.request(RequestCycle.java:545) at org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:456) at org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:263) at org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:190) at org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:283) at org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:767) at org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:697) at org.apache.jk.common.ChannelSocket$SocketConnection.runIt(ChannelSocket.java:889) at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:690) at java.lang.Thread.run(Thread.java:619)

我确实找到了关于类似问题这里的讨论，但我还没有能够将那里提出的建议转化为解决我的情况的方法。我的类不包含名为DocumentUpload的Java变量，但包含以下内容：

fuf = new FileUploadField("DocumentUpload");

Answer 1

我花了几个小时在这个问题上，然后，我再一次，我想出了20分钟后，我发表了这样的消息。修复方法是将upload字段声明转换为提供模型的声明，如下所示：

fuf = new FileUploadField("DocumentUpload", new Model<FileUpload>());

编辑:事实证明，这与1.3-> 1.4迁移有关。根据迁移指南，

FileUploadField -现在需要模型 FileUploadField现在需要一个模型。这意味着，如果以前只使用ID>构造函数(即新FileUploadField("myFileField"))，则需要将其更改为包含>模型(即新的FileUploadField("myFileField"，新的model ()。