Re: java.lang.IllegalArgumentException: Only one CENTER widget may be added

[Stefan Bachert]

Hi Kelo,

what is unclear?
The error message clearly states that you tried more than once to set
a center widget.
.. DockPanel.CENTER);

Set breakpoints on both statements which doing this and watch.

Stefan Bachert
http://gwtworld.de

On Jun 11, 5:32 pm, Kelo <mcac...@gmail.com> wrote:
> Clicking on my ant's script
>
> <target name="devmode" depends="javac" description="Run development
> mode">
>     <java failonerror="true" fork="true"
> classname="com.google.gwt.dev.DevMode">
>       <classpath>
>         <pathelement location="src"/>
>         <pathelement location="/Galileo/workspace/Mark5/src"/>
>         <path refid="project.class.path"/>
>       </classpath>
>       <jvmarg value="-Xmx256M"/>
>       <jvmarg value="-Xss16M"/>
>       <arg value="-noserver"/>
>       <arg value="-port"/>
>       <arg value="8080"/>
>       <arg value="-startupUrl"/>
>       <arg value="VCarCli/VCarCli.html"/>
>       <arg value="-logLevel"/>
>       <arg value="DEBUG"/>
>       <!-- Additional arguments like -style PRETTY or -logLevel DEBUG
> -->
>       <arg value="-war"/>
>       <arg value="D:/Galileo/workspace/VCarCli/war"/>
>       <arg value="com.gasban.VCarCli"/>
>     </java>
> </target>
>
> When I launch DevMode so on my GWT DevMode Box, app tab shows this
> errors:
>
> 00:00:50,872 [ERROR] Unable to load module entry point class
> com.gasban.client.VCarCli (see associated exception for details)
> java.lang.IllegalArgumentException: Only one CENTER widget may be
> added
> at com.google.gwt.user.client.ui.DockPanel.add(DockPanel.java:166)
> at com.gasban.client.AbstractApp.mostrar(AbstractApp.java:87)
> at com.gasban.client.VCarCli.changeHistory(VCarCli.java:36)
> at com.gasban.client.VCarCli.changeHistory(VCarCli.java:33)
> at com.gasban.client.AbstractApp.onValueChange(AbstractApp.java:53)
> at
> com.google.gwt.event.logical.shared.ValueChangeEvent.dispatch(ValueChangeEvent.java:
> 128)
> at
> com.google.gwt.event.logical.shared.ValueChangeEvent.dispatch(ValueChangeEvent.java:
> 1)
> at com.google.gwt.event.shared.HandlerManager
> $HandlerRegistry.fireEvent(HandlerManager.java:65)
> at com.google.gwt.event.shared.HandlerManager$HandlerRegistry.access
> $1(HandlerManager.java:53)
> at
> com.google.gwt.event.shared.HandlerManager.fireEvent(HandlerManager.java:
> 178)
> at
> com.google.gwt.user.client.impl.HistoryImpl.fireEvent(HistoryImpl.java:
> 74)
> at
> com.google.gwt.event.logical.shared.ValueChangeEvent.fire(ValueChangeEvent.java:
> 43)
> at
> com.google.gwt.user.client.impl.HistoryImpl.fireHistoryChangedImpl(HistoryImpl.java:
> 81)
> at
> com.google.gwt.user.client.History.fireCurrentHistoryState(History.java:
> 121)
> at com.gasban.client.VCarCli.cargarPanelesSistema(VCarCli.java:77)
> at com.gasban.client.VCarCli.onModuleLoad(VCarCli.java:44)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:
> 39)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:
> 25)
> at java.lang.reflect.Method.invoke(Method.java:597)
> at com.google.gwt.dev.shell.ModuleSpace.onLoad(ModuleSpace.java:369)
> at
> com.google.gwt.dev.shell.OophmSessionHandler.loadModule(OophmSessionHandler.java:
> 185)
> at
> com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:
> 380)
> at
> com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:
> 222)
> at java.lang.Thread.run(Thread.java:619)
>
> SWF:
>
> Galileo 3.5.2
> GWT 2.0.3
> jdk1.6.0_17
> jboss-4.0.5
>
> sources:
>
> public class VCarCli extends AbstractApp {
>     private static VCarCli instance;
>
>     public VCarCli() {
>         instance = this;
>         }
>
>     public static VCarCli getInstance() {
>         if (instance != null) return instance;
>         return new VCarCli();
>     }
>
>     @Override
>     public void changeHistory(String token, boolean afectaHistoria) {
>             PanelEspecialInfo info = list.encontrar(token);
>             if (info == null) {
>               this.changeHistory("Clientes",false);
>               return;
>             }
>             mostrar(info, afectaHistoria);
>     }
>
>         /**
>          * This is the entry point method.
>          */
>         public void onModuleLoad() {
>                 seeds.put("Clientes", (Seed)(new DRSSeed("clientservice")));
>                 cargarPanelesSistema();
>         }
>
>         private void cargarPanelesSistema() {
>         if (RootPanel.get().getWidgetCount()>0)
> RootPanel.get().remove(0);
>             // Carga todos lo Paneles Especiales
>         list.agregar(Clientes.init(), false);
>         list.agregar(PanelCliente.init());
>
>             // Put the sink list on the left, and add the outer dock panel to
> the
>             // root.
>             sinkContainer = new DockPanel();
>             sinkContainer.setStyleName("sv-Contenedor");
>
>             VerticalPanel vp = new VerticalPanel();
>             vp.setWidth("100%");
>             vp.add(description);
>             vp.add(sinkContainer);
>
>             description.setStyleName("sv-Info");
>
>             panel.add(list, DockPanel.WEST);
>             panel.add(vp, DockPanel.CENTER);
>
>             panel.setCellVerticalAlignment(list, HasAlignment.ALIGN_TOP);
>             panel.setCellWidth(vp, "100%");
>
>             // Add history listener
>             History.addValueChangeHandler(this);
>
>             RootPanel.get("panelPrincipal").add(panel);
>
>             // Now that we've setup our listener, fire the initial history
> state.
>             History.fireCurrentHistoryState();
>
>             changeHistory("Clientes",false);
>     }
>
> }
>
> public abstract class AbstractApp implements PanelInterface,
> EntryPoint, ValueChangeHandler<String>, SeedInterface {
>         protected static PanelEspecialInfo curInfo;
>         protected static PanelEspecial curSink;
>         protected HTML description = new HTML();
>         protected ListaPanelEspecial list = new ListaPanelEspecial();
>         protected DockPanel panel = new DockPanel();
>         protected DockPanel sinkContainer;
>
>         protected HashMap<String,Seed> seeds= new HashMap<String,Seed>();
>
>     public Seed getSeed(String seed) {
>            return (Seed)seeds.get(seed);
>         }
>
>     @Override
>     public void onValueChange(ValueChangeEvent<String> event) {
>                 // Ecuentra el PanelEspecialInfo asociado con el contexto de
> historia. Si alguno es
>                 // encontrado, lo muestra (Este puede no ser encontrado, por
> ejemplo, cuando el usuario vincula
>                 // una URL no tipificada, o al comienzo, cuando el contexto seria
> "").
>         this.changeHistory(event.getValue(),false);
>     }
>
>     public abstract void changeHistory(String token,boolean
> afectaHistoria);
>
>     public PanelEspecial mostrar(PanelEspecialInfo info, boolean
> afectaHistoria) {
>             // No hay problema en volver a mostrar el Panel Especial
> existente.
>             // Este puede estar ya registrado en la práctica, porque cuando
> el contexto de historia esta
>             // configurado nuestro evento onHistoryChanged() intentará
> mostrar el Panel Especial
>             // en curso ya visible.
>             if (info == curInfo)
>               return curInfo.getInstance();
>             curInfo = info;
>
>             // Remueve el viejo Panel Especial del area de display.
>             if (curSink != null) {
>               curSink.onHide();
>               sinkContainer.remove(curSink.getWidget());
>             }
>
>             // Toma la nueva instancia Panel Especial, y muestra su
> descripción en la
>             // lista de Paneles Especiales.
>             curSink = info.getInstance();
>             list.fijarSeleccion(info.getName());
>             description.setHTML(info.getDescription());
>
>             // Si afectaHistoria es verdadero, crea un nuevo item en la pila
> de historia. Este
>             // será el último resultado en onHistoryChanged() al que fue
> llamado. De modo que si es
>             // nuevamente invocado con el método mostrar(), nada suceder pues
> este requerira el mismo
>             // Panel Especial al que ya hemos mostrado.
>             if (afectaHistoria)
>               History.newItem(info.getName());
>
>             // Muestra el nuevo Panel Especial.
>             sinkContainer.add(curSink.getWidget(), DockPanel.CENTER);
>             sinkContainer.setCellWidth(curSink.getWidget(), "100%");
>             sinkContainer.setCellHeight(curSink.getWidget(), "100%");
>             sinkContainer.setCellVerticalAlignment(curSink.getWidget(),
> DockPanel.ALIGN_TOP);
>             curSink.onShow();
>             return curSink;
>         }
>
>     public PanelEspecial getPanelEspecial(String nombre) {
>         return ((PanelEspecialInfo)list.encontrar(nombre)).getInstance();
>     }
>
>     public PanelEspecial getPanelEspecial() {
>         return curSink;
>     }
>
>     public PanelEspecialInfo getPanelEspecialInfo(String nombre) {
>         return (PanelEspecialInfo)list.encontrar(nombre);
>     }
>
>     public PanelEspecialInfo getPanelEspecialInfo() {
>         return curInfo;
>     }
>
> }
>
> Anyone can help me ?

[Kelo]

It doesn't stop on my breakpoints, it just displays this error.

On 13 jun, 07:38, Stefan Bachert <stefanbach...@yahoo.de> wrote:
> Hi Kelo,
>
> what is unclear?
> The error message clearly states that you tried more than once to set
> a center widget.
> .. DockPanel.CENTER);
>
> Set breakpoints on both statements which doing this and watch.
>

> Stefan Bacherthttp://gwtworld.de

[Thomas Broyer]

On 13 juin, 16:20, Kelo <mcac...@gmail.com> wrote:
> It doesn't stop on my breakpoints, it just displays this error.

Yes, of course, as you're running DevMode from Ant. Can't you run it
from Eclipse (or you IDE of choice)?

[Kelo]

I feel gwt's plugin is not good to debug my project because it usually
has bugs. Can I debug it from Eclipse without that plugin ?

[Thomas Broyer]

On 14 juin, 01:16, Kelo <mcac...@gmail.com> wrote:
> I feel gwt's plugin is not good to debug my project because it usually
> has bugs. Can I debug it from Eclipse without that plugin ?

Of course. Just launch DevMode with the same arguments and classpath
you are using in your Ant script from a standard "Java application"
launcher.