0
をスローは、Wicketの1.4.7
のためにそして例に書かれている：なぜ（（整数）weightModel.getObject（））。intValue（）; book.It "ウィケットによるWeb開発を楽しむ" ことで、私は自動改札を勉強例外
int weight = ((Integer) weightModel.getObject()).intValue();
が使用されています。 それは予期しないのRuntimeException最初の行スローボタンSubmitをクリックした場合：
WicketMessage：コンポーネントをターゲットorg.apache.wicket.markup.html.form.IFormSubmitListenerインタフェースのメソッドonFormSubmittedを[MarkupContainer [部品ID =フォームを]投げ例外
根本的な原因：
java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Integer*
おそらくweightModel.getObject（）がStringにを変換できませんでした。
完全例外メッセージが下部にあります。
しかしにコードを変更した後：それは正常に動作します
int weight=Integer.parseInt((String) weightModel.getObject());
。それはうまく動作するはずです。例外をスローする理由はとは何ですか？
フルコード：
GetRequest.java
package myapp.postage;
import java.util.HashMap;
import java.util.Map;
import org.apache.wicket.markup.html.WebPage;
import org.apache.wicket.markup.html.form.Form;
import org.apache.wicket.markup.html.form.TextField;
import org.apache.wicket.model.Model;
@SuppressWarnings("unchecked")
public class GetRequest extends WebPage {
private Model weightModel=new Model();
private Model patronCodeModel=new Model();
private Map patronCodeToDiscount;
public GetRequest(){
patronCodeToDiscount=new HashMap();
patronCodeToDiscount.put("p1", new Integer(90));
patronCodeToDiscount.put("p2", new Integer(95));
Form form=new Form("form"){
@Override
protected void onSubmit(){
int weight = ((Integer) weightModel.getObject()).intValue();
Integer discount=(Integer)patronCodeToDiscount.get(patronCodeModel.getObject());
int postagePerKg=10;
int postage=weight*postagePerKg;
if(discount!=null){
postage=postage*discount.intValue()/100;
}
ShowPostage showPostage=new ShowPostage(postage);
setResponsePage(showPostage);
}
};
TextField weight=new TextField("weight",weightModel);
form.add(weight);
TextField patronCode=new TextField("patronCode",patronCodeModel);
form.add(patronCode);
add(form);
}
}
HTMLファイルGetRequest.html：
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<form wicket:id="form">
<table>
<tr>
<td>Weight</td>
<td><input type="text" wicket:id="weight"/></td>
</tr>
<tr>
<td>Patron code:</td>
<td><input type="text" wicket:id="patronCode"/></td>
</tr>
<tr>
<td></td>
<td><input type="submit"/></td>
</tr>
</table>
</form>
</html>
例外メッセージ： WicketMessage：コンポーネントをターゲットorg.apache.wicket.markup.html.form.IFormSubmitListenerインタフェースのメソッドonFormSubmitted [MarkupContainer [部品ID =フォームは]例外
根本原因投げ：
java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Integer
at myapp.postage.GetRequest$1.onSubmit(GetRequest.java:26)
at org.apache.wicket.markup.html.form.Form.delegateSubmit(Form.java:1538)
at org.apache.wicket.markup.html.form.Form.process(Form.java:934)
at org.apache.wicket.markup.html.form.Form.onFormSubmitted(Form.java:896)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.wicket.RequestListenerInterface.invoke(RequestListenerInterface.java:182)
at org.apache.wicket.request.target.component.listener.ListenerInterfaceRequestTarget.processEvents(ListenerInterfaceRequestTarget.java:73)
at 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:479)
at org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:312)
at 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:191)
at com.springsource.insight.collection.tcserver.request.HttpRequestOperationCollectionValve.invoke(HttpRequestOperationCollectionValve.java:60)
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:293)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:849)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:379)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)
Complete stack:
org.apache.wicket.WicketRuntimeException: Method onFormSubmitted of interface org.apache.wicket.markup.html.form.IFormSubmitListener targeted at component [MarkupContainer [Component id = form]] threw an exception
at org.apache.wicket.RequestListenerInterface.invoke(RequestListenerInterface.java:193)
at org.apache.wicket.request.target.component.listener.ListenerInterfaceRequestTarget.processEvents(ListenerInterfaceRequestTarget.java:73)
at 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:479)
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.wicket.RequestListenerInterface.invoke(RequestListenerInterface.java:182)
at org.apache.wicket.request.target.component.listener.ListenerInterfaceRequestTarget.processEvents(ListenerInterfaceRequestTarget.java:73)
at 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:479)
あなたはどのバージョンのWicketを使用していますか？ 1.4以降、ジェネリックを使用することができます。また、フォームフィールドを追加するコードを表示できますか？ – bert
ああ、コードを見る、申し訳ありません。私は自分の電話から投稿していて、スクロールできませんでした。 – bert