异常信息：

04-Aug-2014 15:49:27.894 SEVERE [http-apr-8080-exec-5] org.apache.catalina.core.StandardWrapperValve.invoke Servlet.service() for servlet [cms] in context with path [/cms] threw exception [Request processing failed; nested exception is org.springframework.validation.BindException: org.springframework.validation.BeanPropertyBindingResult: 6 errors Field error in object ''carContractSearchBox'' on field ''createEndDate'': rejected value []; codes [typeMismatch.carContractSearchBox.createEndDate,typeMismatch.createEndDate,typeMismatch.java.util.Date,typeMismatch]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [carContractSearchBox.createEndDate,createEndDate]; arguments []; default message [createEndDate]]; default message [Failed to convert property value of type ''java.lang.String'' to required type ''java.util.Date'' for property ''createEndDate''; nested exception is java.lang.IllegalStateException: Cannot convert value of type [java.lang.String] to required type [java.util.Date] for property ''createEndDate'': no matching editors or conversion strategy found]

先说明一下，我们的项目使用的是 Spring MVC。相应的功能是一个简单的 form 表单查询功能，里面有一些日期字段的查询。

相应的解决办法为：

在对应的 controller 中增加属性编辑器：

@InitBinder
protected void initBinder(WebDataBinder binder) { SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd"); binder.registerCustomEditor(Date.class, new CustomDateEditor(dateFormat, true)); }

注意这块的 new CustomDateEditor(dateFormat, true) 中的 true，查看 CustomDateEditor 源码可以看到：

/**
 * Create a new CustomDateEditor instance, using the given DateFormat
 * for parsing and rendering.
 * <p>The "allowEmpty" parameter states if an empty String should
 * be allowed for parsing, i.e. get interpreted as null value.
 * Otherwise, an IllegalArgumentException gets thrown in that case.
 * @param dateFormat DateFormat to use for parsing and rendering
 * @param allowEmpty if empty strings should be allowed
 */
public CustomDateEditor(DateFormat dateFormat, boolean allowEmpty) { this.dateFormat = dateFormat; this.allowEmpty = allowEmpty; this.exactDateLength = -1; }

当 allowEmpty 字段为 true 的时候 form 表单传递的值可以为空。否则会出现 "" 字符串解析为 date 报错。

public void run() {
  CustomCreateProperty.generateCreateComponentsMethod(myClass);
}

public void run() {
  CustomCreateProperty.generateCreateComponentsMethod(myClass);
}

public void run() {
  CustomCreateProperty.generateCreateComponentsMethod(myClass);
}

public static void groupButtons(final GuiEditor editor,final List<RadComponent> selectedComponents) {
  if (!editor.ensureEditable()) return;
  String groupName = Messages.showInputDialog(editor.getProject(),UIDesignerBundle.message("group.buttons.name.prompt"),UIDesignerBundle.message("group.buttons.title"),Messages.getQuestionIcon(),editor.getRootContainer().suggestGroupName(),new IdentifierValidator(editor.getProject()));
  if (groupName == null) return;
  RadRootContainer rootContainer = editor.getRootContainer();
  RadButtonGroup group = rootContainer.createGroup(groupName);
  for(RadComponent component: selectedComponents) {
    rootContainer.setGroupForComponent(component,group);
  }
  editor.refreshAndSave(true);
}

public static void groupButtons(final GuiEditor editor,group);
  }
  editor.refreshAndSave(true);
}

public static void groupButtons(final GuiEditor editor,group);
  }
  editor.refreshAndSave(true);
}