I ran into the same problem today and can tell you that it is most
likely the @UiField(provided=true) annotation. I think I see your
problem and you are creating another SimplePager in your constructor
and it is not being assigned to pager1. This is what is giving you the
null pointer exception. I would recommed using the @UiFactory
annotation on a function to create your objects, then you do not need
the provided=true in you @Uifield. It really doesn't matter which
syntax you use but I like to keep my constructors pretty simple. Hope
that helps.
@UiFactory
SimplePager createSimplePager() {
SimplePager simplePager = new SimplePager();
simplePager = new SimplePager(TextLocation.RIGHT);
simplePager.setPageSize(10);
simplePager.setRangeLimited(true);
return simplePager;
}
On Oct 5, 12:52 am, Karzai <[email protected]> wrote:
> Hi I m getting the following error can anyone please help me in
> resolving and getting a proper pagination flow, on clicking of the
> paginate icon. below is the code I have been trying to use and the
> exception I'm getting :
>
> Exception :
> ===========
>
> 11:17:33.939 [ERROR] [myapps] Unable to load module entry point class
> com.apps.app1.client.Myapps (see associated exception for details)
>
> java.lang.NullPointerException: null
> at
> com.google.gwt.user.client.ui.HTMLPanel.addAndReplaceElement(HTMLPanel.java:197)
> at
> com.apps.app1.client.GridData_GridDataUiBinderImpl.createAndBindUi(GridData_GridDataUiBinderImpl.java:
> 37)
> at
> com.apps.app1.client.GridData_GridDataUiBinderImpl.createAndBindUi(GridData_GridDataUiBinderImpl.java:
> 1)
> at com.apps.app1.client.GridData.<init>(GridData.java:61)
> at com.apps.app1.client.Myapps.onModuleLoad(Myapps.java:14)
> 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:
> 396)
> at
> com.google.gwt.dev.shell.OophmSessionHandler.loadModule(OophmSessionHandler.java:
> 200)
> at
> com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:
> 525)
> at
> com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:
> 363)
> at java.lang.Thread.run(Thread.java:619)
>
> The GridData.java file
> ==================
>
> package com.apps.app1.client;
>
> import java.util.ArrayList;
> import java.util.Comparator;
> import java.util.Date;
> import java.util.List;
>
> import com.apps.app1.client.Contact.Category;
> import com.google.gwt.cell.client.CheckboxCell;
> import com.google.gwt.cell.client.DateCell;
> import com.google.gwt.cell.client.EditTextCell;
> import com.google.gwt.cell.client.FieldUpdater;
> import com.google.gwt.cell.client.NumberCell;
> import com.google.gwt.cell.client.SelectionCell;
> import com.google.gwt.core.client.GWT;
> import com.google.gwt.dom.client.Style.Unit;
> import com.google.gwt.event.dom.client.ClickEvent;
> import com.google.gwt.event.dom.client.ClickHandler;
> import com.google.gwt.safehtml.shared.SafeHtmlUtils;
> import com.google.gwt.uibinder.client.UiBinder;
> import com.google.gwt.uibinder.client.UiField;
> import com.google.gwt.user.cellview.client.Column;
> import com.google.gwt.user.cellview.client.DataGrid;
> import com.google.gwt.user.cellview.client.Header;
> import com.google.gwt.user.cellview.client.SafeHtmlHeader;
> import com.google.gwt.user.cellview.client.SimplePager;
> import com.google.gwt.user.cellview.client.TextColumn;
> import
> com.google.gwt.user.cellview.client.ColumnSortEvent.ListHandler;
> import
> com.google.gwt.user.cellview.client.HasKeyboardSelectionPolicy.KeyboardSelectionPolicy;
> import com.google.gwt.user.cellview.client.SimplePager.TextLocation;
> import com.google.gwt.user.client.ui.Button;
> import com.google.gwt.user.client.ui.Composite;
> import com.google.gwt.user.client.ui.DialogBox;
> import com.google.gwt.user.client.ui.VerticalPanel;
> import com.google.gwt.user.client.ui.Widget;
> import com.google.gwt.view.client.ListDataProvider;
> import com.google.gwt.view.client.SelectionChangeEvent;
> import com.google.gwt.view.client.SingleSelectionModel;
>
> public class GridData extends Composite {
>
> private static GridDataUiBinder uiBinder = GWT
> .create(GridDataUiBinder.class);
>
> interface GridDataUiBinder extends UiBinder<Widget, GridData> {
> }
>
> @UiField(provided = true)
> DataGrid<Contact> table;
> @UiField(provided = true)
> SimplePager pager1;
>
> public GridData() {
>
> table = new DataGrid<Contact>();
> SimplePager.Resources pagerResources =
> GWT.create(SimplePager.Resources.class);
> SimplePager pager1 = new SimplePager(TextLocation.CENTER,
> pagerResources, false, 0, true);
> pager1.setDisplay(table);
> initWidget(uiBinder.createAndBindUi(this));
>
> table.setKeyboardSelectionPolicy(KeyboardSelectionPolicy.ENABLED);
> /*DockLayoutPanel mainPanel = new DockLayoutPanel(Unit.EM);
> VerticalPanel panel = new VerticalPanel();
> panel.setBorderWidth(5);
> panel.setTitle("North");
> VerticalPanel panel1 = new VerticalPanel();
> panel.setBorderWidth(5);
> panel1.setTitle("East");
> VerticalPanel panel2 = new VerticalPanel();
> panel.setBorderWidth(5);
> panel2.setTitle("West");
> VerticalPanel panel3 = new VerticalPanel();
> panel.setBorderWidth(5);
> panel2.setTitle("South");
>
> mainPanel.insertNorth(panel, 10.0, null);
> mainPanel.insertWest(panel1, 10.0, null);
> mainPanel.insertEast(panel2, 10.0, null);
> */
>
> table.setWidth("100%");
> final ListDataProvider<Contact> dataProvider = new
> ListDataProvider<Contact>();
> dataProvider.addDataDisplay(table);
>
> String[] categoryArray = new String[]
> {"Jack","Ron","Hermaine","Harry","Voldermort"};
> final Category[] categories = new
> Category[categoryArray.length];
> for(int i = 0 ; i< categoryArray.length; i++)
> {
> categories[i] = new Category(categoryArray[i]);
> }
> List<Contact> CONTACTS = dataProvider.getList();
> Contact contact = new Contact();
> CONTACTS = contact.getContacts();
>
> Column<Contact, Number> ageColumn = new Column<Contact,
> Number>(new
> NumberCell()) {
>
> @Override
> public Integer getValue(Contact object) {
> // TODO Auto-generated method stub
> return object.age;
> }
> };
>
> List<String> categoryName = new ArrayList<String>();
> for(Category category : categories){
>
> categoryName.add(category.getDisplayName());
> }
> SelectionCell selectionCell = new SelectionCell(categoryName);
> Column<Contact, String> categoryColumn = new Column<Contact,
> String>(selectionCell) {
>
> @Override
> public String getValue(Contact object) {
> // TODO Auto-generated method stub
> return object.category.getDisplayName();
> }
> };
> table.setColumnWidth(categoryColumn, 40.0, Unit.PX);
> table.addColumn(categoryColumn, "category", "Category");
> Header<String> ageFooter = new Header<String>(new
> EditTextCell()) {
> @Override
> public String getValue() {
> List<Contact> items = table.getVisibleItems();
> if (items.size() == 0) {
> return "";
> } else {
> int totalAge = 0;
> for (Contact item : items) {
> totalAge += item.age;
> }
> return "Avg: " + totalAge /
> items.size();
> }
> }
> };
> table.setColumnWidth(ageColumn, 40.0, Unit.PX);
> table.addColumn(ageColumn, new
> SafeHtmlHeader(SafeHtmlUtils.fromSafeConstant("Age")), ageFooter);
>
> ListHandler<Contact> sortHandler = new
> ListHandler<Contact>(dataProvider.getList());
> table.addColumnSortHandler(sortHandler);
>
> Column<Contact, String> nameColumn = new Column<Contact,
> String>(new
> EditTextCell()) {
>
> @Override
> public String getValue(Contact object) {
> // TODO Auto-generated method stub
> return object.name;
> }
> };
> nameColumn.setSortable(true);
> sortHandler.setComparator(nameColumn, new
> Comparator<Contact>() {
> public int compare(Contact o1, Contact o2) {
> return -((o1.name).compareTo(o2.name));
> }
> });
>
> table.addColumn(nameColumn, "Name", "Name");
> nameColumn.setFieldUpdater(new FieldUpdater<Contact,
> String>() {
>
> @Override
> public void update(int index, Contact object, String
> value) {
> // TODO Auto-generated method stub
> object.name = value;
> dataProvider.refresh();
> }
> });
> table.setColumnWidth(nameColumn, 60.0, Unit.PX);
> TextColumn<Contact> addressColumn = new TextColumn<Contact>()
> {
>
> @Override
> public String getValue(Contact object) {
> // TODO Auto-generated method stub
> return object.address;
> }
> };
> addressColumn.setSortable(true);
> addressColumn.setFieldUpdater(new FieldUpdater<Contact,
> String>() {
>
> @Override
> public void update(int index, Contact object, String
> value) {
> // TODO Auto-generated method stub
> object.address = value;
> dataProvider.refresh();
> }
> });
> table.setColumnWidth(addressColumn, 70.0, Unit.PX);
> table.addColumn(addressColumn, "Address", "Address");
>
> DateCell dateCell = new DateCell();
> Column<Contact, Date> dateColumn = new Column<Contact,
> Date>(dateCell) {
>
> @Override
> public Date getValue(Contact object) {
> // TODO Auto-generated method stub
> return object.birthday;
>
> }
> };
> table.setColumnWidth(dateColumn, 40.0, Unit.PX);
> table.addColumn(dateColumn, "Date", "Birthday");
> /*final SelectionModel<Contact> selectionModel12 = new
> MultiSelectionModel<Contact>();
> table.setSelectionModel(selectionModel12,
> DefaultSelectionEventManager.<Contact>createCheckboxManager());*/
> final SingleSelectionModel<Contact> selectionModel1 =
> new
> SingleSelectionModel<Contact>();
> table.setSelectionModel(selectionModel1);
> selectionModel1.addSelectionChangeHandler(new
> SelectionChangeEvent.Handler() {
> @Override
> public void onSelectionChange(SelectionChangeEvent
> event) {
> // TODO Auto-generated method stub
> Contact selected =
> selectionModel1.getSelectedObject();
> if(selected != null)
> {
> final DialogBox box = new DialogBox();
> box.setAnimationEnabled(true);
> box.setHTML(selected.name);
> box.setText(selected.name);
> VerticalPanel w = new VerticalPanel();
> //w.setSize("5px", "10px");
> w.setBorderWidth(1);
> /*Image image = new
> Image("D:\\checkout1\\rocro-modularization\
> \rocro-web\\rocro-entrypoint\\target\\rocro-entrypoint\
> \com.subex.rocro.web.app.ROCroApplication\\resources\\common\\icons\
> \ol_close.png");
> image.addClickHandler(new
> ClickHandler() {
>
> @Override
> public void
> onClick(ClickEvent event) {
> // TODO
> Auto-generated method stub
> box.hide();
> }
> });
> image.setSize("50px", "30px");
> w.add(image)*/
> w.add(new Button("Close IT", new
> ClickHandler() {
>
> @Override
> public void
> onClick(ClickEvent event) {
> // TODO
> Auto-generated method stub
> box.hide();
> }
> }));
> w.setTitle(selected.name);
> box.setPopupPosition(350, 100);
> box.add(w);
> box.show();
> }
> }
> });
> Column<Contact, Boolean> checkColumn = new Column<Contact,
> Boolean>(new CheckboxCell(true, false)) {
>
> @Override
> public Boolean getValue(Contact object) {
>
> return selectionModel1.isSelected(object);
> }
> };
> table.addColumn(checkColumn,
> SafeHtmlUtils.fromSafeConstant("<br/>"));
>
> table.setColumnWidth(checkColumn, 40, Unit.PX);
> table.setVisibleRange(0, 13);
> table.setRowCount(CONTACTS.size(), true);
> table.setRowData(0, CONTACTS);
> /*mainPanel.insertSouth(pager, 10.0, null);
> VerticalPanel panel4 = new VerticalPanel();
> panel4.add(table);
> panel4.add(pager);
> mainPanel.add(table); */
> /*RootLayoutPanel.get().add(mainPanel);*/
>
> }
>
> }
>
> the GridData.ui.xml file
> ===================
>
> <!DOCTYPE ui:UiBinder SYSTEM "http://dl.google.com/gwt/DTD/xhtml.ent";>
> <ui:UiBinder xmlns:ui="urn:ui:com.google.gwt.uibinder"
> xmlns:g="urn:import:com.google.gwt.user.client.ui"
> xmlns:c="urn:import:com.google.gwt.user.cellview.client">
>
> <g:DockLayoutPanel
> unit="EM">
> <!-- DataGrid. -->
> <g:center>
> <c:DataGrid
> ui:field="table" />
> </g:center>
>
> <!-- Pager. -->
> <g:south
> size="3">
> <g:HTMLPanel>
> <table
> style="width:100%">
> <tr>
> <td
> align='center'>
> <c:SimplePager ui:field="pager1"/>
> </td>
> </tr>
> </table>
> </g:HTMLPanel>
> </g:south>
> </g:DockLayoutPanel>
> </ui:UiBinder>
>
> the Myapps.java file
> ===================
>
> package com.apps.app1.client;
>
> import com.google.gwt.core.client.EntryPoint;
> import com.google.gwt.user.client.ui.RootLayoutPanel;
>
> /**
> * Entry point classes define <code>onModuleLoad()</code>.
> */
> public class Myapps implements EntryPoint {
>
> @Override
> public void onModuleLoad() {
> GridData data = new GridData();
> RootLayoutPanel.get().add(data);
> }
>
> }
>
> Please help me out in getting the a proper solution for it.
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