[Struts2+Maven+Hibernete] problema sul file pom.xml

[DarthSandr]

Salve a tutti.
Sto provando a realizzare un'applicazione web usando Struts2, maven e hibernate ma sto avendo dei problemi sul file pom.xml.

Il mio file è così configurato:

<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">
  <modelVersion>4.0.0</modelVersion>
  <groupId>it.telecomitalia.testmaven</groupId>
  <artifactId>Struts2TutorialWeb</artifactId>
  <packaging>war</packaging>
  <version>0.0.1-SNAPSHOT</version>
  <name>Struts2TutorialWeb Maven Webapp</name>
  <url>http://maven.apache.org</url>
  <dependencies>
    
   <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version>
    </dependency>
    
    <dependency>
              <groupId>junit</groupId>
              <artifactId>junit</artifactId>
              <version>3.8.1</version>
              <scope>test</scope>
    </dependency>
   <!-- Struts 2 -->
   <dependency>
              <groupId>org.apache.struts</groupId>
              <artifactId>struts2-core</artifactId>
              <version>2.3.1.2</version>
   </dependency>
   
   <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-core</artifactId>
            <version>4.0.1.Final</version>
   </dependency>
   <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-validator</artifactId>
            <version>4.2.0.Final</version>
   </dependency>
   <dependency>
            <groupId>org.hibernate.common</groupId>
            <artifactId>hibernate-commons-annotations</artifactId>
            <version>4.0.1.Final</version>
            <classifier>tests</classifier>
   </dependency>
   <dependency>
            <groupId>org.hibernate.javax.persistence</groupId>
            <artifactId>hibernate-jpa-2.0-api</artifactId>
            <version>1.0.1.Final</version>
   </dependency>
   <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-entitymanager</artifactId>
            <version>4.0.1.Final</version>
   </dependency>
   
   <dependency>
            <groupId>javax.validation</groupId>
            <artifactId>validation-api</artifactId>
            <version>1.0.0.GA</version>
            <scope>provided</scope>
   </dependency>
   <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>1.6.4</version>
   </dependency>
   <dependency>
            <groupId>org.jboss.logging</groupId>
            <artifactId>jboss-logging</artifactId>
            <version>3.1.0.CR2</version>
   </dependency>
   <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>1.6.4</version>
   </dependency>
 
   <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.10</version>
   </dependency>
      
  </dependencies>
  <build>
    <finalName>Struts2TutorialWeb</finalName>
    <plugins>
            <plugin>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>2.3.2</version>
                <configuration>
                    <source>1.6</source>
                    <target>1.6</target>
                </configuration>
            </plugin>
    </plugins>
  </build>
</project>

ma mi da un errore del tipo

Missing artifact xml-apis:xml-apis:jar:1.0.b2

Che sparisce se tolgo tutte le dipendenze per hibernate, quindi il problema sembra legato a questo specifico componente.
Ho cercato un pò su internet ma non ho trovato nulla a riguardo.
Qualcuno mi saprebbe dare qualche info utile?

Ciao, grazie
Sandro