PushErrorHandling.java example

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framework-master
package com.vaadin.tests.push;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

import com.vaadin.server.ErrorHandler;
import com.vaadin.server.VaadinRequest;
import com.vaadin.server.VaadinSession;
import com.vaadin.shared.communication.PushMode;
import com.vaadin.tests.components.AbstractReindeerTestUI;
import com.vaadin.ui.Button;
import com.vaadin.ui.Button.ClickEvent;
import com.vaadin.ui.Label;
import com.vaadin.v7.data.util.AbstractInMemoryContainer;
import com.vaadin.v7.data.util.BeanContainer;
import com.vaadin.v7.event.ItemClickEvent;
import com.vaadin.v7.event.ItemClickEvent.ItemClickListener;
import com.vaadin.v7.ui.Table;

public class PushErrorHandling extends AbstractReindeerTestUI {

    @Override
    protected void setup(VaadinRequest request) {
        getPushConfiguration().setPushMode(PushMode.AUTOMATIC);

        VaadinSession.getCurrent().setErrorHandler(new ErrorHandler() {

            @Override
            public void error(com.vaadin.server.ErrorEvent event) {
                addComponent(new Label(
                        "An error! " + event.getThrowable().getMessage()));
                System.err.println(
                        "An error! " + event.getThrowable().getMessage());
            }
        });

        final Button button = new Button("Click for NPE!",
                new Button.ClickListener() {
                    @Override
                    public void buttonClick(ClickEvent event) {
                        ((String) null).length(); // Null-pointer exception
                    }
                });
        button.setId("npeButton");
        addComponent(button);

        final Table view = new Table("testtable");
        view.setId("testtable");
        view.setSelectable(true);
        view.setMultiSelect(false);
        view.setImmediate(true);
        view.setSizeFull();

        view.addItemClickListener(new ItemClickListener() {

            @Override
            public void itemClick(ItemClickEvent event) {
                BeanContainer<String, AbstractInMemoryContainer> metaContainer = new BeanContainer<String, AbstractInMemoryContainer>(
                        AbstractInMemoryContainer.class) {
                    @Override
                    public Collection<String> getContainerPropertyIds() {
                        List<String> cpropIds = new ArrayList<>(
                                super.getContainerPropertyIds());
                        cpropIds.add("testid");
                        return cpropIds;
                    }

                    @Override
                    public Class<?> getType(Object propertyId) {
                        ((Object) null).hashCode();
                        return super.getType(propertyId);
                    }
                };
                view.setContainerDataSource(metaContainer);

            }
        });
        view.addContainerProperty("Column", String.class, "Click for NPE");
        view.addItem(new Object());

        addComponent(view);

    }

    @Override
    protected String getTestDescription() {
        return "Error handling should still work w/ push enabled. (Button can be handled properly, table causes internal error)";
    }

    @Override
    protected Integer getTicketNumber() {
        return 11882;
    }
}