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GWT not loading * .nocache.js

I have a Maven project built using the gwt-maven archetype. Although it works fine for the purpose of mvn gwt:run , however, when I try to run it in the tomcat7 container either mvn tomcat:run or mvn gwt:compile && mvn tomcat:run , it does not load dynamically created GWT widgets.

According to the Google Chrome console, it cannot find the *.nocache.js file, although it is exactly where it should be in the /target/ folder.

I'm currently trying to display a simple "Hello" label in the entry point module:

GWT Entry Point

 public class Hello implements EntryPoint { public void onModuleLoad() { Label hello = new Label("TESTESTSTSTS"); RootPanel.get("helloContainer").add(hello); } }

*. HTML

 <html> <head> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <link type="text/css" rel="stylesheet" href="veltisto.css"> <title>Web Application Starter Project</title> <script type="text/javascript" language="javascript" src="veltisto/veltisto.nocache.js"></script> </head> <body> <iframe src="javascript:''" id="__gwt_historyFrame" tabIndex='-1' style="position:absolute;width:0;height:0;border:0"></iframe> <noscript> <div style="width: 22em; position: absolute; left: 50%; margin-left: -11em; color: red; background-color: white; border: 1px solid red; padding: 4px; font-family: sans-serif"> Your web browser must have JavaScript enabled in order for this application to display correctly. </div> </noscript> <div id="helloContainer"></div> </body> </html>

pom.xml

 <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"> <!-- POM file generated with GWT webAppCreator --> <modelVersion>4.0.0</modelVersion> <groupId>gr.veltisto</groupId> <artifactId>web</artifactId> <packaging>war</packaging> <version>1.0-SNAPSHOT</version> <name>GWT Maven Archetype</name> <properties> <!-- Convenience property to set the GWT version --> <gwtVersion>2.4.0</gwtVersion> <!-- GWT needs at least java 1.5 --> <webappDirectory>${project.build.directory}/${project.build.finalName}</webappDirectory> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> </properties> <dependencies> <dependency> <groupId>com.google.gwt</groupId> <artifactId>gwt-servlet</artifactId> <version>${gwtVersion}</version> <scope>runtime</scope> </dependency> <dependency> <groupId>com.google.gwt</groupId> <artifactId>gwt-user</artifactId> <version>${gwtVersion}</version> <scope>provided</scope> </dependency> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.7</version> <scope>test</scope> </dependency> <dependency> <groupId>javax.validation</groupId> <artifactId>validation-api</artifactId> <version>1.0.0.GA</version> <scope>test</scope> </dependency> <dependency> <groupId>javax.validation</groupId> <artifactId>validation-api</artifactId> <version>1.0.0.GA</version> <classifier>sources</classifier> <scope>test</scope> </dependency> <dependency> <groupId>com.github.gwtbootstrap</groupId> <artifactId>gwt-bootstrap</artifactId> <version>2.0.4.0</version> </dependency> </dependencies> <build> <!-- Generate compiled stuff in the folder used for developing mode --> <outputDirectory>${webappDirectory}/WEB-INF/classes</outputDirectory> <plugins> <!-- Copy static web files before executing gwt:run --> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-war-plugin</artifactId> <version>2.1.1</version> <executions> <execution> <phase>compile</phase> <goals> <goal>exploded</goal> </goals> </execution> </executions> <configuration> <webappDirectory>${webappDirectory}</webappDirectory> </configuration> </plugin> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <version>2.3.2</version> <configuration> <source>1.5</source> <target>1.5</target> </configuration> </plugin> <plugin> <groupId>org.apache.tomcat.maven</groupId> <artifactId>tomcat7-maven-plugin</artifactId> <version>2.0</version> <configuration> <path>/veltisto</path> </configuration> </plugin> <!-- GWT Maven Plugin --> <plugin> <groupId>org.codehaus.mojo</groupId> <artifactId>gwt-maven-plugin</artifactId> <version>2.4.0</version> <executions> <execution> <goals> <goal>compile</goal> </goals> </execution> </executions> <!-- Plugin configuration. There are many available options, see gwt-maven-plugin documentation at codehaus.org --> <configuration> <runTarget>veltisto.html</runTarget> <hostedWebapp>${webappDirectory}</hostedWebapp> </configuration> </plugin> </plugins> </build> </project>

*. GWT.XML

 <module rename-to='veltisto'> <!-- Inherit the core Web Toolkit stuff. --> <inherits name='com.google.gwt.user.User' /> <inherits name="com.google.gwt.uibinder.UiBinder" /> <!-- We need the JUnit module in the main module, --> <!-- otherwise eclipse complains (Google plugin bug?) --> <inherits name='com.google.gwt.junit.JUnit' /> <!-- Inherit the default GWT style sheet. You can change --> <!-- the theme of your GWT application by uncommenting --> <!-- any one of the following lines. --> <inherits name='com.google.gwt.user.theme.standard.Standard' /> <!-- <inherits name='com.google.gwt.user.theme.chrome.Chrome'/> --> <!-- <inherits name='com.google.gwt.user.theme.dark.Dark'/> --> <!-- Other module inherits --> <inherits name="com.google.gwt.uibinder.UiBinder" /> <inherits name="com.github.gwtbootstrap.Bootstrap" /> <!-- Specify the app entry point class. --> <entry-point class='gr.veltisto.web.client.Hello' /> <!-- Specify the paths for translatable code --> <source path='client' /> <source path='shared' /> </module>
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2 answers

tomcat7:run uses only src/main/webapp . You want to use tomcat7:run-war (which package will do) or tomcat7:run-war-only (if you already have a war:exploded ).

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Using the firebug or chrome inspector, do you see that the .nocache.js and .cache.html file .nocache.js loaded correctly? Or is there an error, for example, 404? If there is 404, look in the path indicated in your military directory - is the file there?

If the .nocache.js file .nocache.js missing or in the wrong place, it most likely means that the path from the *.html page that you specified in the compiled JS is incorrect.

If the .cache.html file is missing, this often means that gwt: compilation was skipped, or that gwt: run or gwt: debug was executed during or after compilation. Do not run gwt:compile , followed by gwt:run or :debug: as the last two will delete the compiled files.

One final thought: the tomcat:run phase may try to capture the completed .war file, and your war:exploded will not create it. In addition, when you run gwt:compile this may not lead to the creation of a completed compiled military directory. To handle all this, consider creating your own assembly to create a war file first, and then trying to make tomcat:run behavior. The first step here is to display gwt:compile in the prepare-package phase, and then make sure that the resulting war contains the .nocache.js and .cache.html files as expected.

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Source: https://habr.com/ru/post/926634/

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