Wicketを使っているときによくあるエラーとして次のようなものがある
WicketMessage: Unable to find component with id 'hello' in [Page class = HelloWorld, id = 0, version = 0]. This means that you declared wicket:id=hello in your markup, but that you either did not add the component to your page at all, or that the hierarchy does not match. [markup = file:/***/***/NetBeansProjects/Test/build/web/WEB-INF/classes/HelloWorld.html
これはHTMLのwicket:idに対応するコンポーネントがJavaで追加されていないときに発生する。次のようにコンポーネントを作成したはいいが、追加をしてない場合などである
edit<html>
<head>
<title>Hello World!</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body>
<span wicket:id="hello">Hello World!</span>
</body>
</html>
import org.apache.wicket.markup.html.WebPage;
import org.apache.wicket.markup.html.basic.Label;
public class HelloWorld extends WebPage{
public HelloWorld(){
Label label = new Label("hello", "Hello World!");
}
}
逆にHTMLにwicket:idがないのにコンポーネントを追加した場合は下記のように例外が発生する
WicketMessage: The component(s) below failed to render. A common problem is that you have added a component in code but forgot to reference it in the markup (thus the component will never be rendered). 1. [Component id = hello, page = HelloWorld, path = 6:hello.Label, isVisible = true, isVersioned = true] Root cause: org.apache.wicket.WicketRuntimeException: The component(s) below failed to render. A common problem is that you have added a component in code but forgot to reference it in the markup (thus the component will never be rendered). 1. [Component id = hello, page = HelloWorld, path = 6:hello.Label, isVisible = true, isVersioned = true] at org.apache.wicket.Page.checkRendering(Page.java:1116) at org.apache.wicket.Page.renderPage(Page.java:914) at org.apache.wicket.request.target.component.BookmarkablePageRequestTarget.respond(BookmarkablePageRequestTarget.java:231) at org.apache.wicket.request.AbstractRequestCycleProcessor.respond(AbstractRequestCycleProcessor.java:104) at org.apache.wicket.RequestCycle.processEventsAndRespond(RequestCycle.java:1172) at org.apache.wicket.RequestCycle.step(RequestCycle.java:1243) at org.apache.wicket.RequestCycle.steps(RequestCycle.java:1331) at org.apache.wicket.RequestCycle.request(RequestCycle.java:493) at org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:363) at org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:194) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:390) 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: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.coyote.http11.Http11Processor.process(Http11Processor.java:844) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:584) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447) at java.lang.Thread.run(Thread.java:619)
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LastUpdate: 2008-05-07 11:01:45, ModifiedBy: d-kami
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