eclipse ignoring xml annotation

I generated a Dynamic Web Project in Eclipse with the target runtime Apache Tomcat v8.0 and Dynamic web module version 3.1 and Default Configuration for Apache Tomcat v8.0.

I wrote the following Java class:

 @XmlRootElement
 @XmlAccessorType(XmlAccessType.FIELD)
 public class Account implements Serializable {
   @XmlElement(name="InternalId")
   public String InternalId;
   @XmlElement(name="FirstLineName")
   public String FirstLineName;
   @XmlElement(name="MatchCode", required=false)
   public String MatchCode;
   @XmlElement(name="contacts", required=false)
   public Contact[] contacts;

   @Override
  public String toString() {
      String text = "InternalId <" + InternalId + 
                     "> FirstLineName <" + FirstLineName + 
                     "> MatchCode <" + MatchCode + ">\n";
      for(Contact c : contacts) {
        text = text + "contact " + c.toString() + "\n";
      }
      return text;
  }
}

If I am going to create the WebService the wsdl generated looks like:

<complexType name="Account">
 <sequence>
  <element name="InternalId" nillable="true" type="xsd:string"/>
  <element name="FirstLineName" nillable="true" type="xsd:string"/>
  <element name="MatchCode" nillable="true" type="xsd:string"/>
  <element name="contacts" nillable="true" type="impl:ArrayOfContact"/>
 </sequence>
</complexType>

The match code is not required, so there should be something like minOccurs="1"

Kind Regards, Lukas