RequestFactory javax.validation.ValidationException NoClassDefFoundError

Question

I use Guice along with GWT 2.4 but I get a javax.validation.ValidationException NoClassDefFoundError when I run the server. In the pom.xml file I referenced the correct dependency:

    <dependency>
        <groupId>javax.validation</groupId>
        <artifactId>validation-api</artifactId>
        <version>1.0.0.GA</version>
    </dependency>
    <dependency>
        <groupId>javax.validation</groupId>
        <artifactId>validation-api</artifactId>
        <version>1.0.0.GA</version>
        <classifier>sources</classifier>
        <scope>provided</scope>
    </dependency>

but in Eclipse I can't see the validation-api-1.0.0.GA.jar in the Maven Dependencies tree. The behavior is pretty strange:

• I can find validation-api-1.0.0.GA-sources.jar and javax.validation-validation-api-1.0.0.GA-sources.jar under the target directory. I don't understand why it's there.
• In the Maven Dependencies tree of eclipse, I can see a reference to javax.validation-validation-api-1.0.0.GA-sources.jar which contains 5 packages but no classes.

Running the app outside eclipse works. I run it using mvn gwt:run.

Any ideas?

Answer 1

The problem came from the dependency gwt-user, I managed to fix it by excluding the dependency on validation-api:

    <dependency>
        <groupId>com.google.gwt</groupId>
        <artifactId>gwt-user</artifactId>
        <version>${gwt.version}</version>
        <scope>provided</scope>
        <exclusions>
            <exclusion>
                <groupId>javax.validation</groupId>
                <artifactId>validation-api</artifactId>
            </exclusion>
        </exclusions>
    </dependency>