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Apache Wicket - How to retrieve the selected value from DropdownChoice in java

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Java class : This is the method where i created the dropdownchoice object for select menu and add it to the form. In this method adding the projects list to the billableProjectsList

public class ReportCriteria implements Serializable {
    private static final long serialVersionUID = xxxxxxxxxL;
   
    private ReportCriteria selectedBillableProject;


    public ReportCriteria getSelectedBillableProject() {
        return selectedBillableProject;
    }

    public void setSelectedBillableProject(ReportCriteria selectedBillableProject) {
        this.selectedBillableProject = selectedBillableProject;
    }
}

private Form<ReportCriteria> createCriteriaPanel(String id, 
                                         IModel<ReportCriteria> model) {
  SelectionForm form = new SelectionForm(id, model);
  ReportCriteria criteria = (ReportCriteria) getDefaultModelObject();
  List<Project> billableProjects = ProjectUtil.filterBillable(allProjects);
  IModel<Project> dropdownModel =   new 
                    PropertyModel<Project(criteria,"selectedBillableProject");
  DropDownChoice<Project> billableProjectsList = new DropDownChoice<>(
                    "projectsList",
                    dropdownModel,
                    billableProjects,
                    new ChoiceRenderer<Project>("fullNameWithCustomer"));
   billableProjectsList.setLabel(new ResourceModel("printMonth.billable"));
   form.add(billableProjectsList);
   System.out.println("selectedBillableProject --- >"
                                  +billableProjectsList.getModelObject()
                                  +"value is --->"
                                  +criteria.getSelectedBillableProject());
    }

Html file code : This html file is for select menu display .

<td style="padding-left: 5px">
   <strong>
       <wicket:message key="printMonth.billable"/>
   </strong><br/>
   <p style="border-top: solid 1px white;margin:0 0 5px 0;padding:0">
      <select wicket:id="projectsList"></select>
    </p>
</td>

Error : This error is resulted once i select the dropdown value from the list . I have created the variable selectedBillableObject in ReportCriteria class and have added the setter and getter. But i am unable to convert it in this method to add it to form since it is type casting issue . But when i tried to print the value in selectedBillablePorject , its is null .

<pre>11-19@16:52:50 ERROR org.apache.wicket.DefaultExceptionMapper - Unexpected error occurred
org.apache.wicket.WicketRuntimeException: Method onFormSubmitted of interface org.apache.wicket.markup.html.form.IFormSubmitListener targeted at 
[SelectionForm [Component id = criteriaForm]] on component [SelectionForm [Component id = criteriaForm]] threw an exception
    at org.apache.wicket.RequestListenerInterface.internalInvoke(RequestListenerInterface.java:268)
    at org.apache.wicket.RequestListenerInterface.invoke(RequestListenerInterface.java:216)
    at org.apache.wicket.core.request.handler.ListenerInterfaceRequestHandler.invokeListener(ListenerInterfaceRequestHandler.java:243)
    at org.apache.wicket.core.request.handler.ListenerInterfaceRequestHandler.respond(ListenerInterfaceRequestHandler.java:236)
    at org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor.respond(RequestCycle.java:890)
    at org.apache.wicket.request.RequestHandlerStack.execute(RequestHandlerStack.java:64)
    at org.apache.wicket.request.cycle.RequestCycle.execute(RequestCycle.java:261)
    at org.apache.wicket.request.cycle.RequestCycle.processRequest(RequestCycle.java:218)
    at org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:289)
    at org.apache.wicket.protocol.http.WicketFilter.processRequestCycle(WicketFilter.java:259)
    at org.apache.wicket.protocol.http.WicketFilter.processRequest(WicketFilter.java:201)
    at org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:282)
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1484)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
    at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:87)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:192)
    at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:160)
    at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)
    at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:262)
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1484)
    at org.springframework.orm.hibernate4.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:151)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1476)
    at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:501)
    at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)
    at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:557)
    at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)
    at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1086)
    at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:429)
    at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193)
    at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1020)
    at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)
    at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:255)
    at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:154)
    at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
    at org.eclipse.jetty.server.Server.handle(Server.java:370)
    at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:494)
    at org.eclipse.jetty.server.AbstractHttpConnection.content(AbstractHttpConnection.java:982)
    at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.content(AbstractHttpConnection.java:1043)
    at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:865)
    at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:240)
    at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82)
    at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:696)
    at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:53)
    at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)
    at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543)
    at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.apache.wicket.RequestListenerInterface.internalInvoke(RequestListenerInterface.java:258)
    ... 47 more
Caused by: org.apache.wicket.util.convert.ConversionException: Could not convert value: net.rrm.ehour.domain.Project[----] to type: net.rrm.ehour.report.criteria.ReportCriteria. Could not find compatible converter.
    at org.apache.wicket.ConverterLocator$DefaultConverter.convertToObject(ConverterLocator.java:121)
    at org.apache.wicket.core.util.lang.PropertyResolverConverter.convert(PropertyResolverConverter.java:95)
    at org.apache.wicket.core.util.lang.PropertyResolver$MethodGetAndSet.setValue(PropertyResolver.java:1194)
    at org.apache.wicket.core.util.lang.PropertyResolver$ObjectAndGetSetter.setValue(PropertyResolver.java:651)
    at org.apache.wicket.core.util.lang.PropertyResolver.setValue(PropertyResolver.java:151)
    at org.apache.wicket.model.AbstractPropertyModel.setObject(AbstractPropertyModel.java:132)
    at org.apache.wicket.Component.setDefaultModelObject(Component.java:3052)
    at org.apache.wicket.markup.html.form.FormComponent.setModelObject(FormComponent.java:1577)
    at org.apache.wicket.markup.html.form.FormComponent.updateModel(FormComponent.java:1098)
    at org.apache.wicket.markup.html.form.Form$FormModelUpdateVisitor.component(Form.java:230)
    at org.apache.wicket.markup.html.form.Form$FormModelUpdateVisitor.component(Form.java:200)
    at org.apache.wicket.util.visit.Visits.visitPostOrderHelper(Visits.java:274)
    at org.apache.wicket.util.visit.Visits.visitPostOrderHelper(Visits.java:262)
    at org.apache.wicket.util.visit.Visits.visitPostOrder(Visits.java:245)
    at org.apache.wicket.markup.html.form.FormComponent.visitComponentsPostOrder(FormComponent.java:424)
    at org.apache.wicket.markup.html.form.Form.internalUpdateFormComponentModels(Form.java:1860)
    at org.apache.wicket.markup.html.form.Form.updateFormComponentModels(Form.java:1825)
    at org.apache.wicket.markup.html.form.Form.process(Form.java:955)
    at org.apache.wicket.markup.html.form.Form.onFormSubmitted(Form.java:788)
    at org.apache.wicket.markup.html.form.Form.onFormSubmitted(Form.java:721)
    ... 52 more
11-19@16:53:18 ERROR org.apache.wicket.DefaultExceptionMapper - Unexpected error occurred
org.apache.wicket.WicketRuntimeException: Method onFormSubmitted of interface org.apache.wicket.markup.html.form.IFormSubmitListener targeted at [SelectionForm [Component id = criteriaForm]] on component [SelectionForm [Component id = criteriaForm]] threw an exception
    at org.apache.wicket.RequestListenerInterface.internalInvoke(RequestListenerInterface.java:268)
    at org.apache.wicket.RequestListenerInterface.invoke(RequestListenerInterface.java:216)
    at org.apache.wicket.core.request.handler.ListenerInterfaceRequestHandler.invokeListener(ListenerInterfaceRequestHandler.java:243)
    at org.apache.wicket.core.request.handler.ListenerInterfaceRequestHandler.respond(ListenerInterfaceRequestHandler.java:236)
    at org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor.respond(RequestCycle.java:890)
    at org.apache.wicket.request.RequestHandlerStack.execute(RequestHandlerStack.java:64)
    at org.apache.wicket.request.cycle.RequestCycle.execute(RequestCycle.java:261)
    at org.apache.wicket.request.cycle.RequestCycle.processRequest(RequestCycle.java:218)
    at org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:289)
    at org.apache.wicket.protocol.http.WicketFilter.processRequestCycle(WicketFilter.java:259)
    at org.apache.wicket.protocol.http.WicketFilter.processRequest(WicketFilter.java:201)
    at org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:282)
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1484)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
    at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:87)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:192)
    at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:160)
    at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)
    at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:262)
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1484)
    at org.springframework.orm.hibernate4.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:151)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1476)
    at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:501)
    at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)
    at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:557)
    at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)
    at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1086)
    at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:429)
    at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193)
    at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1020)
    at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)
    at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:255)
    at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:154)
    at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
    at org.eclipse.jetty.server.Server.handle(Server.java:370)
    at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:494)
    at org.eclipse.jetty.server.AbstractHttpConnection.content(AbstractHttpConnection.java:982)
    at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.content(AbstractHttpConnection.java:1043)
    at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:865)
    at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:240)
    at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82)
    at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:696)
    at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:53)
    at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)
    at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543)
    at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.apache.wicket.RequestListenerInterface.internalInvoke(RequestListenerInterface.java:258)
    ... 47 more
Caused by: org.apache.wicket.util.convert.ConversionException: Could not convert value: net.rrm.ehour.domain.Project@328849ff[]] to type: net.rrm.ehour.report.criteria.ReportCriteria. 
ould not find compatible converter.
    at org.apache.wicket.ConverterLocator$DefaultConverter.convertToObject(ConverterLocator.java:121)
    at org.apache.wicket.core.util.lang.PropertyResolverConverter.convert(PropertyResolverConverter.java:95)
    at org.apache.wicket.core.util.lang.PropertyResolver$MethodGetAndSet.setValue(PropertyResolver.java:1194)
    at org.apache.wicket.core.util.lang.PropertyResolver$ObjectAndGetSetter.setValue(PropertyResolver.java:651)
    at org.apache.wicket.core.util.lang.PropertyResolver.setValue(PropertyResolver.java:151)
    at org.apache.wicket.model.AbstractPropertyModel.setObject(AbstractPropertyModel.java:132)
    at org.apache.wicket.Component.setDefaultModelObject(Component.java:3052)
    at org.apache.wicket.markup.html.form.FormComponent.setModelObject(FormComponent.java:1577)
    at org.apache.wicket.markup.html.form.FormComponent.updateModel(FormComponent.java:1098)
    at org.apache.wicket.markup.html.form.Form$FormModelUpdateVisitor.component(Form.java:230)
    at org.apache.wicket.markup.html.form.Form$FormModelUpdateVisitor.component(Form.java:200)
    at org.apache.wicket.util.visit.Visits.visitPostOrderHelper(Visits.java:274)
    at org.apache.wicket.util.visit.Visits.visitPostOrderHelper(Visits.java:262)
    at org.apache.wicket.util.visit.Visits.visitPostOrder(Visits.java:245)
    at org.apache.wicket.markup.html.form.FormComponent.visitComponentsPostOrder(FormComponent.java:424)
    at org.apache.wicket.markup.html.form.Form.internalUpdateFormComponentModels(Form.java:1860)
    at org.apache.wicket.markup.html.form.Form.updateFormComponentModels(Form.java:1825)
    at org.apache.wicket.markup.html.form.Form.process(Form.java:955)
    at org.apache.wicket.markup.html.form.Form.onFormSubmitted(Form.java:788)
    at org.apache.wicket.markup.html.form.Form.onFormSubmitted(Form.java:721)
    ... 52 more
    </pre>
java html wicket dropdownchoice
Original Q&A
2

There are 2 answers

13
martin-g On BEST ANSWER

What is

 new PropertyModel<Test>(this," ");

?

PropertyModel is used to read/write object's member fields. I am pretty sure Java syntax does not allow to name a member field as " ", i.e. a space character.

In addition the method that you should use is dropDownChoice.getModelObject(), not getObject().

Update:

public class ReportCriteria implements Serializable {
private static final long serialVersionUID = xxxxxxxxxL;

private ReportCriteria selectedBillableProject;

selectedBillableProject has to be a Project, not ReportCriteria.

5
Acasmol On

Lest go by parts:

1.- Why are you trying to use a property model to handle DropBox selected option? You are defining a Property Model like this:

IModel<Test> dropdownModel =   new PropertyModel<Test>(this," ");

Property Model is used to tied the fields of yout POJO with the model object, doing the "binging" between your POJO's and Wicket componentes automitically. In your sintax this should be a model object that handles a POJO, and instead of " " you should put the name of the property of the POJO that will be tied to that Property Model. Maybe this is the reason of why you are getting "No get Method defined because this doesnt have a POJO with a property called "selectedBillableItem", remember, Property Models use 'getters' and 'setters' for seeking the POJO's properties.

2.- I have used DropDownChoice as follows:

DropDownChoice myDropDownChoice = new DropDownChoice<String>("myDropDownChoiceWicketId", new Model<String>(), List<String> object);

3.- Recovering the selected item of DropDownChoice as follows:

anyModelObject.getObject().setToAnyProperty(myDropDownChoice.getModelObject());

Hoping you get any hints from this.

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