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MherBaghinyanMherBaghinyan
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GWT app new branch
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‎google-web-toolkit/pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
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<!-- POM file generated with GWT webAppCreator -->
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<modelVersion>4.0.0</modelVersion>
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<groupId>com.baeldung</groupId>
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<artifactId>google_web_toolkit</artifactId>
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<packaging>war</packaging>
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<version>1.0-SNAPSHOT</version>
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<name>com.baeldung.Google_web_toolkit</name>
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<properties>
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<!-- Setting maven.compiler.source to something different to 1.8
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needs that you configure the sourceLevel in gwt-maven-plugin since
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GWT compiler 2.8 requires 1.8 (see gwt-maven-plugin block below) -->
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<maven.compiler.source>1.8</maven.compiler.source>
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<maven.compiler.target>1.8</maven.compiler.target>
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<!-- Don't let your Mac use a crazy non-standard encoding -->
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
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</properties>
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<dependencyManagement>
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<dependencies>
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<!-- ensure all GWT deps use the same version (unless overridden) -->
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<dependency>
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<groupId>com.google.gwt</groupId>
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<artifactId>gwt</artifactId>
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<version>2.8.2</version>
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<type>pom</type>
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<scope>import</scope>
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</dependency>
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</dependencies>
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</dependencyManagement>
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<dependencies>
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<dependency>
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<groupId>com.google.gwt</groupId>
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<artifactId>gwt-servlet</artifactId>
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<scope>runtime</scope>
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</dependency>
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<dependency>
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<groupId>com.google.gwt</groupId>
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<artifactId>gwt-user</artifactId>
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<scope>provided</scope>
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</dependency>
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<dependency>
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<groupId>com.google.gwt</groupId>
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<artifactId>gwt-dev</artifactId>
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<scope>provided</scope>
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</dependency>
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<dependency>
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<groupId>junit</groupId>
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<artifactId>junit</artifactId>
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<version>4.11</version>
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<scope>test</scope>
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</dependency>
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</dependencies>
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<build>
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<!-- Output classes directly into the webapp, so that IDEs and "mvn process-classes" update them in DevMode -->
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<outputDirectory>${project.build.directory}/${project.build.finalName}/WEB-INF/classes</outputDirectory>
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<plugins>
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<!-- GWT Maven Plugin-->
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<plugin>
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<groupId>net.ltgt.gwt.maven</groupId>
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<artifactId>gwt-maven-plugin</artifactId>
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<version>1.0-rc-8</version>
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<executions>
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<execution>
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<goals>
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<goal>compile</goal>
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<goal>test</goal>
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</goals>
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</execution>
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</executions>
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<configuration>
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<moduleName>com.baeldung.Google_web_toolkit</moduleName>
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<moduleShortName>Google_web_toolkit</moduleShortName>
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<failOnError>true</failOnError>
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<!-- GWT compiler 2.8 requires 1.8, hence define sourceLevel here if you use
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a different source language for java compilation -->
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<sourceLevel>1.8</sourceLevel>
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<!-- Compiler configuration -->
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<compilerArgs>
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<!-- Ask GWT to create the Story of Your Compile (SOYC) (gwt:compile) -->
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<arg>-compileReport</arg>
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<arg>-XcompilerMetrics</arg>
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</compilerArgs>
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<!-- DevMode configuration -->
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<warDir>${project.build.directory}/${project.build.finalName}</warDir>
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<classpathScope>compile+runtime</classpathScope>
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<!-- URL(s) that should be opened by DevMode (gwt:devmode). -->
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<startupUrls>
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<startupUrl>Google_web_toolkit.html</startupUrl>
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</startupUrls>
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</configuration>
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</plugin>
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<!-- Skip normal test execution, we use gwt:test instead -->
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<plugin>
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<artifactId>maven-surefire-plugin</artifactId>
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<version>2.17</version>
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<configuration>
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<skip>true</skip>
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</configuration>
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</plugin>
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</plugins>
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</build>
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</project>

‎google-web-toolkit/src/main/java/com/baeldung/Google_web_toolkit.gwt.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<!--
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When updating your version of GWT, you should also update this DTD reference,
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so that your app can take advantage of the latest GWT module capabilities.
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-->
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<!DOCTYPE module PUBLIC "-//Google Inc.//DTD Google Web Toolkit 2.8.2//EN"
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"http://gwtproject.org/doctype/2.8.2/gwt-module.dtd">
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<module rename-to='google_web_toolkit'>
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<!-- Inherit the core Web Toolkit stuff. -->
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<inherits name='com.google.gwt.user.User'/>
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<!-- Inherit the default GWT style sheet. You can change -->
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<!-- the theme of your GWT application by uncommenting -->
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<!-- any one of the following lines. -->
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<inherits name='com.google.gwt.user.theme.clean.Clean'/>
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<!-- <inherits name='com.google.gwt.user.theme.standard.Standard'/> -->
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<!-- <inherits name='com.google.gwt.user.theme.chrome.Chrome'/> -->
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<!-- <inherits name='com.google.gwt.user.theme.dark.Dark'/> -->
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<!-- Other module inherits -->
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<!-- Specify the app entry point class. -->
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<entry-point class='com.baeldung.client.Google_web_toolkit'/>
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<!-- Specify the paths for translatable code -->
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<source path='client'/>
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<source path='shared'/>
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<!-- allow Super Dev Mode -->
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<add-linker name="xsiframe"/>
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</module>

‎google-web-toolkit/src/main/java/com/baeldung/client/Google_web_toolkit.java‎

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package com.baeldung.client;
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import com.baeldung.shared.MessageService;
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import com.baeldung.shared.MessageServiceAsync;
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import com.google.gwt.core.client.EntryPoint;
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import com.google.gwt.core.client.GWT;
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import com.google.gwt.event.dom.client.ClickEvent;
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import com.google.gwt.event.dom.client.ClickHandler;
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import com.google.gwt.event.dom.client.KeyCodes;
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import com.google.gwt.event.dom.client.KeyUpEvent;
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import com.google.gwt.event.dom.client.KeyUpHandler;
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import com.google.gwt.user.client.rpc.AsyncCallback;
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import com.google.gwt.user.client.ui.Button;
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import com.google.gwt.user.client.ui.DialogBox;
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import com.google.gwt.user.client.ui.HTML;
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import com.google.gwt.user.client.ui.Label;
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import com.google.gwt.user.client.ui.RootPanel;
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import com.google.gwt.user.client.ui.TextBox;
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import com.google.gwt.user.client.ui.VerticalPanel;
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/**
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* Entry point classes define <code>onModuleLoad()</code>.
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*/
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public class Google_web_toolkit implements EntryPoint {
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private final MessageServiceAsync messageServiceAsync = GWT.create(MessageService.class);
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public void onModuleLoad() {
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Button sendButton = new Button("Submit");
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TextBox nameField = new TextBox();
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nameField.setText("Hi there");
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Label warningLabel = new Label();
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sendButton.addStyleName("sendButton");
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RootPanel.get("nameFieldContainer").add(nameField);
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RootPanel.get("sendButtonContainer").add(sendButton);
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RootPanel.get("errorLabelContainer").add(warningLabel);
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Button closeButton = new Button("Thanks");
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closeButton.getElement().setId("closeButton");
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Label textToServerLabel = new Label();
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HTML serverResponseLabel = new HTML();
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VerticalPanel vPanel = new VerticalPanel();
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vPanel.addStyleName("vPanel");
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vPanel.add(new HTML("Sending message to the server:"));
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vPanel.add(textToServerLabel);
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vPanel.add(new HTML("<br><b>Server replies:</b>"));
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vPanel.add(serverResponseLabel);
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vPanel.setHorizontalAlignment(VerticalPanel.ALIGN_RIGHT);
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vPanel.add(closeButton);
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vPanel.setVisible(false);
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RootPanel.get("serverResponseContainer").add(vPanel);
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closeButton.addClickHandler(event -> {
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sendButton.setEnabled(true);
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sendButton.setFocus(true);
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vPanel.setVisible(false);
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});
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class MyHandler implements ClickHandler, KeyUpHandler {
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public void onClick(ClickEvent event) {
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sendMessageToServer();
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}
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public void onKeyUp(KeyUpEvent event) {
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if (event.getNativeKeyCode() == KeyCodes.KEY_ENTER) {
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sendMessageToServer();
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}
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}
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private void sendMessageToServer() {
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warningLabel.setText("");
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String textToServer = nameField.getText();
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if (textToServer == null || textToServer.isEmpty()) {
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warningLabel.setText("Please enter the message");
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return;
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}
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sendButton.setEnabled(false);
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textToServerLabel.setText(textToServer);
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serverResponseLabel.setText("");
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messageServiceAsync.sendMessage(textToServer, new AsyncCallback<String>() {
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public void onFailure(Throwable caught) {
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serverResponseLabel.addStyleName("serverResponseLabelError");
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serverResponseLabel.setHTML("server error occurred");
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closeButton.setFocus(true);
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}
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public void onSuccess(String result) {
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serverResponseLabel.removeStyleName("serverResponseLabelError");
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serverResponseLabel.setHTML(result);
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closeButton.setFocus(true);
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vPanel.setVisible(true);
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}
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});
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}
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}
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// Add a handler to send the name to the server
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MyHandler handler = new MyHandler();
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sendButton.addClickHandler(handler);
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nameField.addKeyUpHandler(handler);
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}
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}

‎google-web-toolkit/src/main/java/com/baeldung/server/MessageServiceImpl.java‎

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package com.baeldung.server;
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import com.baeldung.shared.MessageService;
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import com.google.gwt.user.server.rpc.RemoteServiceServlet;
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import java.time.LocalDateTime;
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/**
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* The server-side implementation of the RPC service.
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*/
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@SuppressWarnings("serial")
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public class MessageServiceImpl extends RemoteServiceServlet implements MessageService {
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public String sendMessage(String message) throws IllegalArgumentException {
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if (message == null) {
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throw new IllegalArgumentException("message is null");
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}
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return "Hello, " + message + "!<br><br> Time received: " + LocalDateTime.now();
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}
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}

‎google-web-toolkit/src/main/java/com/baeldung/shared/MessageService.java‎

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package com.baeldung.shared;
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import com.google.gwt.user.client.rpc.RemoteService;
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import com.google.gwt.user.client.rpc.RemoteServiceRelativePath;
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/**
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* The client-side stub for the RPC service.
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*/
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@RemoteServiceRelativePath("greet")
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public interface MessageService extends RemoteService {
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String sendMessage(String message) throws IllegalArgumentException;
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}

‎google-web-toolkit/src/main/java/com/baeldung/shared/MessageServiceAsync.java‎

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package com.baeldung.shared;
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import com.google.gwt.user.client.rpc.AsyncCallback;
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/**
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* The async counterpart of <code>MessageService</code>.
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*/
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public interface MessageServiceAsync {
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void sendMessage(String input, AsyncCallback<String> callback) throws IllegalArgumentException;
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}

‎google-web-toolkit/src/main/webapp/Google_web_toolkit.css‎

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/** Add css rules here for your application. */
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h1 {
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font-size: 2em;
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font-weight: bold;
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color: #777777;
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margin: 40px 0px 70px;
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text-align: center;
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}
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.sendButton {
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display: block;
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font-size: 16pt;
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}
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/** Most GWT widgets already have a style name defined */
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.gwt-DialogBox {
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width: 400px;
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}
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.vPanel {
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margin: 5px;
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}
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.serverResponseLabelError {
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color: red;
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}
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/** Set ids using widget.getElement().setId("idOfElement") */
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#closeButton {
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margin: 15px 6px 6px;
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}

‎google-web-toolkit/src/main/webapp/Google_web_toolkit.html‎

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<!doctype html>
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<!-- The DOCTYPE declaration above will set the -->
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<!-- browser's rendering engine into -->
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<!-- "Standards Mode". Replacing this declaration -->
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<!-- with a "Quirks Mode" doctype is not supported. -->
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<html>
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<head>
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<link type="text/css" rel="stylesheet" href="Google_web_toolkit.css">
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<title>Sample GWT Application</title>
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<script type="text/javascript" language="javascript" src="google_web_toolkit/google_web_toolkit.nocache.js"></script>
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</head>
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<body>
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<h1>Sample GWT Application</h1>
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<table align="center">
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<tr>
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<td colspan="2" style="font-weight:bold;">Please enter your message:</td>
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</tr>
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<tr>
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<td id="nameFieldContainer"></td>
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<td id="sendButtonContainer"></td>
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</tr>
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<tr>
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<td colspan="2" style="color:red;" id="errorLabelContainer"></td>
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</tr>
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<tr>
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<td colspan="2" style="color:red;" id="serverResponseContainer"></td>
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</tr>
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</table>
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</body>
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</html>

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