Create a Maven project which has the following directory structure:

Here is content of the pom.xml file:

<?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 

    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">

    <modelVersion>4.0.0</modelVersion>

    <groupId>com.acme</groupId>

    <artifactId>action-example</artifactId>

    <version>1.0</version>

    <packaging>jar</packaging>

    

    <properties>

        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

    </properties>

    

    <dependencies>

        <dependency>

            <groupId>org.gatein.portal</groupId>

            <artifactId>exo.portal.webui.core</artifactId>

            <version>3.5.2.Final</version>

            <scope>provided</scope>

        </dependency>

        <dependency>

            <groupId>org.exoplatform.commons</groupId>

            <artifactId>commons-webui-ext</artifactId>

            <version>4.0.0</version>

            <scope>provided</scope>

        </dependency>

        <dependency>

            <groupId>org.exoplatform.ecms</groupId>

            <artifactId>ecms-core-webui-explorer</artifactId>

            <version>4.0.0</version>

        </dependency>

    </dependencies>

</project>

Create a new action and its corresponding listener by editing the ShowNodePathActionComponent class as below:

package com.acme;


import javax.jcr.Node;


import org.exoplatform.ecm.webui.component.explorer.UIJCRExplorer;

import org.exoplatform.ecm.webui.component.explorer.control.listener.UIActionBarActionListener;

import org.exoplatform.web.application.ApplicationMessage;

import org.exoplatform.webui.config.annotation.ComponentConfig;

import org.exoplatform.webui.config.annotation.EventConfig;

import org.exoplatform.webui.core.UIComponent;

import org.exoplatform.webui.event.Event;


@ComponentConfig(

    events = { @EventConfig(listeners = ShowNodePathActionComponent.ShowNodePathActionListener.class) })


public class ShowNodePathActionComponent extends UIComponent {


    public static class ShowNodePathActionListener extends UIActionBarActionListener<ShowNodePathActionComponent> {

        @Override

        protected void processEvent(Event<ShowNodePathActionComponent> event) throws Exception {

            UIJCRExplorer uiJCRExplorer = event.getSource().getAncestorOfType(UIJCRExplorer.class);

            Node node = uiJCRExplorer.getCurrentNode();

            event.getRequestContext()

            .getUIApplication()

            .addMessage(new ApplicationMessage("Node path:" + node.getPath(), null, ApplicationMessage.INFO));

        }

    }

}

Register the new action with UIExtensionManager in the configuration.xml file as below:

<configuration xmlns="http://www.exoplatform.org/xml/ns/kernel_1_2.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.exoplatform.org/xml/ns/kernel_1_2.xsd http://www.exoplatform.org/xml/ns/kernel_1_2.xsd">

    <external-component-plugins>

        <target-component>org.exoplatform.webui.ext.UIExtensionManager</target-component>

        <component-plugin>

            <name>add.action</name>

            <set-method>registerUIExtensionPlugin</set-method>

            <type>org.exoplatform.webui.ext.UIExtensionPlugin</type>

            <init-params>

                <object-param>

                    <name>ShowNodePath</name>

                    <object type="org.exoplatform.webui.ext.UIExtension">

                        <field name="type">

                            <string>org.exoplatform.ecm.dms.UIActionBar</string>

                        </field>

                        <field name="name">

                            <string>ShowNodePath</string>

                        </field>

                        <field name="component">

                            <string>com.acme.ShowNodePathActionComponent</string>

                        </field>

                    </object>

                </object-param>

            </init-params>

        </component-plugin>

    </external-component-plugins>

</configuration>

Some remarks about the Java code and the configuration:

Build your project: mvn clean install

Copy the .jar file (target/action-example-1.0.jar) to the lib folder of eXo Platform.

Restart the server.

Log in as an administrator and go to Content Administration.

Edit a view to add the action to one of tabs of the view. At this step, you will see the ShowNodePath action as below:

Make sure there is a drive that applies the view. For example, you can choose the Admin view and the Collaboration drive.

Go to Sites Explorer and select the drive, then switch to the edited view.

Select any node. The "ShowNodePath" button now displays in Action bar as below: