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Asked: 2026-06-17T02:27:43+00:00

I want to create a gwt maven project with multiple gwt modules. some of

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I want to create a gwt maven project with multiple gwt modules. some of them are just utility modules means they have no entry point. Basically I have already a gwt project with multiple gwt modules in it and I have converted it to maven but while compilation its giving me following exception :

[ERROR] Unable to find type
‘in.appops.showcase.web.gwt.uploadservice.client.UploadService’ [INFO]
[ERROR] Hint: Previous compiler errors may have made this type
unavailable [INFO] [ERROR] Hint: Check the inheritance chain
from your module; it may not be inheriting a required module or a
module may not be adding its source path entries properly

My project has core and dispath modules which are utility modules without entry point and other uploadservice module which has entry point which is inheriting the core module .

So I put core.gwt.xml ,dispatch.get.xml in their packages i.e in src/main/java itself and uploadservice.gwt.xml in resources folder of maven.
also in pom.xml I am providing the modules to compile:

<configuration>
                    <lifecycleMappingMetadata>
                        <pluginExecutions>
                            <pluginExecution>
                                <pluginExecutionFilter>
                                    <groupId>org.codehaus.mojo</groupId>
                                    <artifactId>gwt-maven-plugin</artifactId>
                                    <version>2.4.0</version>
                                    <goals>
                                        <goal>clean</goal>
                                        <goal>resources</goal>
                                        <goal>compile</goal>
                                        <goal>i18n</goal>
                                        <goal>generateAsync</goal>
                                    </goals>
                                    <configuration>
                                        <runTarget>Index.html</runTarget>
                                        <hostedWebapp>${webappDirectory}</hostedWebapp>
                                         <modules>
                                            <!-- <module>platform.bindings.web.gwt.dispatch.Dispatch</module>
                                             <module>platform.core.Core</module>   -->
                                            <module>showcase.web.gwt.addressbook.AddressBook</module>
                                            <module>showcase.web.gwt.uploadservice.UploadService</module>
                                        </modules> 
                                    </configuration>
                                </pluginExecutionFilter>
                                <action>
                                    <execute />
                                </action>
                            </pluginExecution>
                        </pluginExecutions>
                    </lifecycleMappingMetadata>
                </configuration>

can anybody help me to get out of this exception. Is it neccessary that I need to provide the order to compile the modules or anything else?

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1 Answer

  1. Editorial Team

    Note 1 –
    When using gwt standard approach your folder structure

        src/main/java/showcase/web/gwt/yourmodule/yourmodule.gwt.xml
    src/main/java/showcase/web/gwt/yourmodule/client 
    src/main/java/showcase/web/gwt/yourmodule/public 

Your pom references 
    <module>showcase.web.gwt.addressbook.AddressBook</module>
    <module>showcase.web.gwt.uploadservice.UploadService</module>

Your .gwt.xml file location
    src/main/java/showcase/web/gwt/addressbook/AddressBook.gwt.xml
    src/main/java/showcase/web/gwt/uploadservice/UploadService.gwt.xml

    Note 2 – <lifecycleMappingMetadata> is for your m2e = maven eclipse plugin. For clear example of GWT MAVEN POM example – http://code.google.com/p/google-web-toolkit/source/browse/trunk/samples/validation/pom.xml

    Note 3 – Exactly follow the extremely simple example of gwt maven sample project – http://code.google.com/p/google-web-toolkit/source/browse/trunk/samples/validation/

    DO NOT CHANGE FOLDER LOCATION. *FOLLOW THE NAMING CONVENTION.* even folder names like public, client are picked by “name” in GWT.

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