Re: Cannot compile gtw maven plugin example from mojo.codehaus.org

[Thomas Broyer]

See https://code.google.com/p/google-web-toolkit/wiki/WorkingWithMaven

Don't use the gwt-maven-plugin archetype as a starting point.

On Thursday, December 27, 2012 6:59:04 PM UTC+1, Anatoly Chervyakov wrote:

Hello folks

I am interested in learning GWT and I'd like to use Maven as a build tool so I navigated to http://mojo.codehaus.org/gwt-maven-plugin/user-guide/archetype.html and created a test project.

I am using OSX 10.6.8, Eclipse 3.6.2, GWT Eclipse plugin 2.5.0 and here is my pom.xml
<?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">

    <!-- POM file generated with GWT webAppCreator -->
    <modelVersion>4.0.0</modelVersion>
    <groupId>se.anatoly.test</groupId>
    <artifactId>test</artifactId>
    <packaging>war</packaging>
    <version>1.0-SNAPSHOT</version>
    <name>GWT Maven Archetype</name>

    <properties>
        <!-- Convenience property to set the GWT version -->
        <gwtVersion>2.5.0</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>
    </dependencies>

    <build>
        <!-- Generate compiled stuff in the folder used for developing mode -->
        <outputDirectory>${webappDirectory}/WEB-INF/classes</outputDirectory>

        <plugins>

            <!-- GWT Maven Plugin -->
            <plugin>
                <groupId>org.codehaus.mojo</groupId>
                <artifactId>gwt-maven-plugin</artifactId>
                <version>2.5.0</version>
                <executions>
                    <execution>
                        <goals>
                            <goal>compile</goal>
                            <goal>test</goal>
                            <goal>i18n</goal>
                            <goal>generateAsync</goal>
                        </goals>
                    </execution>
                </executions>
                <!-- Plugin configuration. There are many available options, see gwt-maven-plugin
                    documentation at codehaus.org -->
                <configuration>
                    <runTarget>test.html</runTarget>
                    <hostedWebapp>${webappDirectory}</hostedWebapp>
                    <i18nMessagesBundle>se.anatoly.test.client.Messages</i18nMessagesBundle>
                </configuration>
            </plugin>

            <!-- 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>1.6</source>
                    <target>1.6</target>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

The problem:
when I execute "mvn package" the printout ends with "BUILD SUCCESS" but it also contains this weird line (Ignored 80 units with compilation errors in first pass.):
....
[INFO] --- gwt-maven-plugin:2.5.0:compile (default) @ test ---
[INFO] auto discovered modules [se.anatoly.test.test]
[INFO] Compiling module se.anatoly.test.test
[INFO]    Validating units:
[INFO]       Ignored 80 units with compilation errors in first pass.
[INFO] Compile with -strict or with -logLevel set to TRACE or DEBUG to see all errors.
....

I tried "mvn package -Dgwt.logLevel=TRACE" and then I see a thousand of lines like below, which I don't understand what it is (what's this validation? and why all these errors?):
....
[INFO]    Validating units:
[INFO]       Errors in 'com/google/gwt/editor/client/EditorDriver.java'
[INFO]          Line 20: The import javax.validation.ConstraintViolation cannot be resolved
[INFO]          Line 97: ConstraintViolation cannot be resolved to a type
[INFO]       Errors in 'com/google/gwt/editor/client/impl/AbstractSimpleBeanEditorDriver.java'
[INFO]          Line 28: Name clash: The method setConstraintViolations(Iterable<ConstraintViolation<?>>) of type BaseEditorDriver<T,E> has the same erasure as setConstraint
....

Could anybody explain to me what is going on and how I get rid of these errors?

Best regards,
Anatoly