Question

我有一个这样的检票口页面：

public final class Services extends WebPage {
    public Services() {
        super();   
    }

    public Services(PageParameters params) {
        StringValue serviceType = params.get("name");
        if("report".equals(serviceType.toString())) {
            this.getResponse().write("HelloWorld");
        }
    }
}

它的HTML是空的。当我调用此页面的URL时，我看到此错误

Index: 0, Size: 0
java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
    at java.util.ArrayList.rangeCheck(ArrayList.java:604)
    at java.util.ArrayList.get(ArrayList.java:382)
    at java.util.Collections$UnmodifiableList.get(Collections.java:1211)
    at org.apache.wicket.markup.Markup.get(Markup.java:130)
    at org.apache.wicket.Component.internalRender(Component.java:2356)
    at org.apache.wicket.Component.render(Component.java:2307)
    at org.apache.wicket.Page.renderPage(Page.java:1010)
    at org.apache.wicket.request.handler.render.WebPageRenderer.renderPage(WebPageRenderer.java:121)
    at org.apache.wicket.request.handler.render.WebPageRenderer.respond(WebPageRenderer.java:271)
    at org.apache.wicket.core.request.handler.RenderPageRequestHandler.respond(RenderPageRequestHandler.java:165)
    at org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor.respond(RequestCycle.java:861)
    at org.apache.wicket.request.RequestHandlerStack.execute(RequestHandlerStack.java:64)
    at org.apache.wicket.request.cycle.RequestCycle.execute(RequestCycle.java:261)
    at org.apache.wicket.request.cycle.RequestCycle.processRequest(RequestCycle.java:218)
    at org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:289)
    at org.apache.wicket.protocol.http.WicketFilter.processRequestCycle(WicketFilter.java:259)
    at org.apache.wicket.protocol.http.WicketFilter.processRequest(WicketFilter.java:201)
    at org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:282)
...

我不知道我的简单检票页真的出了什么问题。

Answer 1

Wicket曾希望相关HTML模板中的某些标记符合代码。作为您的例外的发起人的行在 Component.class 中参见

private final void internalRender()
{
...
    MarkupElement elem = markup.get(0);
...
}

该代码获取相关标记的“根”元素。没有任何标记的代码在Wicket中是非常的。

提示：如果您只想处理请求，请安装可共享资源或除页面之外的其他一些资源。

尝试在wicket中写入响应时IndexOutOfBoundException

1 个答案: