Create a "Hello World" Widget

1. Create a new java class for your widget. For example HelloWorldWidget. This class should extend org.orienteer.core.widget.AbstractWidget or one of its child classes.
2. Create an html file with the same name as your class in the same java package. For example HelloWorldWidget.html. Fill the file as shown below.
3. Annotate your class with @Widget annotation and specify required characteristics of the widget.
4. Ensure that the package with your widget is enabled for scanning in a module. For example: registerWidgets("com.mycompany.mypackage");

Example:

HelloWorldWidget.html

<wicket:extend>
<h1>Hello World!</h1>
</wicket:extend>

HelloWorldWidget.java

package org.orienteer.examples.component.widget;

import org.apache.wicket.model.IModel;
import org.apache.wicket.model.Model;
import org.orienteer.core.component.FAIcon;
import org.orienteer.core.component.FAIconType;
import org.orienteer.core.widget.AbstractWidget;
import org.orienteer.core.widget.Widget;

import com.orientechnologies.orient.core.record.impl.ODocument;

@Widget(domain="schema", tab="hello", id="hello-world", autoEnable=true)
public class HelloWorldWidget extends AbstractWidget<Void> {

    public HelloWorldWidget(String id, IModel<Void> model, IModel<ODocument> widgetDocumentModel) {
        super(id, model, widgetDocumentModel);
    }

    @Override
    protected FAIcon newIcon(String id) {
        return new FAIcon(id, FAIconType.exclamation);
    }

    @Override
    protected IModel<String> getDefaultTitleModel() {
        return Model.of("Hi!");
    }

}

For creating more complex widgets you should be familiar with Apache Wicket.