Palette, NullPointer
--------------------
Key: WICKET-2442
URL: https://issues.apache.org/jira/browse/WICKET-2442
Project: Wicket
Issue Type: Bug
Components: wicket-extensions
Affects Versions: 1.4.1
Reporter: Ulrik Hagberg
Fix For: 1.4.2
When I try to add a Palette to a Page, I get an NullPointerException.
Stacktrace:
WicketMessage: Error attaching this container for rendering: [MarkupContainer
[Component id = palette]]
Root cause:
java.lang.NullPointerException
at
org.apache.wicket.extensions.markup.html.form.palette.component.Recorder.initIds(Recorder.java:99)
at
org.apache.wicket.extensions.markup.html.form.palette.component.Recorder.onBeforeRender(Recorder.java:86)
at org.apache.wicket.Component.internalBeforeRender(Component.java:1061)
at org.apache.wicket.Component.beforeRender(Component.java:1095)
at
org.apache.wicket.MarkupContainer.onBeforeRenderChildren(MarkupContainer.java:1751)
at org.apache.wicket.Component.onBeforeRender(Component.java:3863)
at
org.apache.wicket.extensions.markup.html.form.palette.Palette.onBeforeRender(Palette.java:191)
at org.apache.wicket.Component.internalBeforeRender(Component.java:1061)
at org.apache.wicket.Component.beforeRender(Component.java:1095)
at
org.apache.wicket.MarkupContainer.onBeforeRenderChildren(MarkupContainer.java:1751)
at org.apache.wicket.Component.onBeforeRender(Component.java:3863)
at org.apache.wicket.Component.internalBeforeRender(Component.java:1061)
at org.apache.wicket.Component.beforeRender(Component.java:1095)
at
org.apache.wicket.MarkupContainer.onBeforeRenderChildren(MarkupContainer.java:1751)
at org.apache.wicket.Component.onBeforeRender(Component.java:3863)
at org.apache.wicket.Page.onBeforeRender(Page.java:1501)
at org.apache.wicket.Component.internalBeforeRender(Component.java:1061)
at org.apache.wicket.Component.beforeRender(Component.java:1095)
at org.apache.wicket.Component.prepareForRender(Component.java:2232)
at org.apache.wicket.Component.prepareForRender(Component.java:2269)
at org.apache.wicket.Page.renderPage(Page.java:893)
at
org.apache.wicket.request.target.component.BookmarkablePageRequestTarget.respond(BookmarkablePageRequestTarget.java:262)
at
org.apache.wicket.request.AbstractRequestCycleProcessor.respond(AbstractRequestCycleProcessor.java:105)
at
org.apache.wicket.RequestCycle.processEventsAndRespond(RequestCycle.java:1258)
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.java:289)
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 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$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:454)
at java.lang.Thread.run(Thread.java:619)
Code:
public class HomePage extends WebPage {
public HomePage() {
Form _form = new Form("form");
add(_form);
List<ChoiceModelObject> _availableChoices = new
ArrayList<ChoiceModelObject>();
_availableChoices.add(new ChoiceModelObject(0, "a"));
_availableChoices.add(new ChoiceModelObject(1, "b"));
_availableChoices.add(new ChoiceModelObject(2, "c"));
_availableChoices.add(new ChoiceModelObject(3, "d"));
ChoiceRenderer<ChoiceModelObject> _choiceRenderer = new
ChoiceRenderer<ChoiceModelObject>() {
@Override
public Object getDisplayValue(ChoiceModelObject choiceModelObject) {
return choiceModelObject.getName();
}
@Override
public String getIdValue(ChoiceModelObject modelObject, int i) {
return String.valueOf(modelObject.getId());
}
};
_form.add(new Palette("palette", new ListModel(), new
CollectionModel(_availableChoices), _choiceRenderer, 10, true));
}
class ChoiceModelObject implements Serializable {
private int id;
private String name;
public ChoiceModelObject() {
}
private ChoiceModelObject(int id, String name) {
this.id = id;
this.name = name;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
}
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