Mongo java.lang.IllegalArgumentException: can't serialize class java.lang.Class

I'm using Java+Spring+MongoTemplate+MongoDB. If I wanna to insert object into my MongoDB then I've got error:

 java.lang.IllegalArgumentException: can't serialize class java.lang.Class

Here is my mongo-context.xml:

    <mongo:mongo id="mongoLocal" host="${local.mongo.host}" port="${local.mongo.port}">
    <mongo:options
            connections-per-host="700"
            threads-allowed-to-block-for-connection-multiplier="100"
            connect-timeout="15000"
            auto-connect-retry="true"
            socket-timeout="60000"
            write-number="1"/>
</mongo:mongo>

<mongo:db-factory id="mongoDbFactoryLocal" dbname="${local.mongo.db}" mongo-ref="mongoLocal"/>

<bean id="mongoConverterLocal" class="org.springframework.data.mongodb.core.convert.MappingMongoConverter">
    <constructor-arg index="0" ref="mongoDbFactoryLocal" />
    <constructor-arg index="1">
        <bean class="org.springframework.data.mongodb.core.mapping.MongoMappingContext" />
    </constructor-arg>
    <property name="mapKeyDotReplacement" value="\+"/>
</bean>

<bean id="mongoTemplateLocal" class="org.springframework.data.mongodb.core.MongoTemplate">
    <constructor-arg name="mongoDbFactory" ref="mongoDbFactoryLocal"/>
    <constructor-arg name="mongoConverter" ref="mongoConverterLocal"/>
</bean>

mongo-context.xml I imported to spring-context.xml and use it like:

   <bean id="statusDao" class="com.status.StatusDAOImpl">
   </bean>

   <bean id="BasicDAO" class="com.status.PreparableDAO">
          <property name="daos">
                 <list>
                        <ref bean="statusDao"/>
                 </list>
          </property>
          <property name="template" ref="mongoTemplateLocal"/>              
   </bean>

And finally class (SimpleMessage) that I'm trying to insert into Mongo:

public abstract class Message implements Serializable {

@Id
private String id;

public Message() {super();}

public Message(String id) {
    this.id = id;
}

public String getId() {
    return id;
}

public void setId(String id) {
    this.id = id;
}

}

and

    @Document

public class SimpleMessage extends Message {

private Date arriveDateTime;

public SimpleMessage() {
    super("unknown");
    this.arriveDateTime = new Date();
}

public SimpleMessage(String id) {
    super(id);
    this.arriveDateTime = new Date();
}    

public Date getArriveDateTime() {
    return arriveDateTime;
}

public void setArriveDateTime(Date arriveDateTime) {
    this.arriveDateTime = arriveDateTime;
}    

@Override
public String toString() {
    return new StringBuffer("EmlFile: [")
            .append("id: ")
            .append(getId())                
            .append("; date: ")
            .append(arriveDateTime)
            .append("]")
            .toString();
}

@Override
public int hashCode() {
    int hash = ThreadLocalRandom.current().nextInt(1000);
    hash = hash * 31 + (getId() == null ?
            "".hashCode() : getId().hashCode());       
    hash = hash
            + (arriveDateTime == null ? 0 : arriveDateTime.hashCode());

    return hash;
}

@Override
public boolean equals(Object obj) {
    if (this == obj)
        return true;

    if (!(obj instanceof EmlMessage))
        return false;

    SimpleMessage otherA = (SimpleMessage) obj;
    return getId().equals(otherA.getId());
}

}

Any idea? I know that I can extends BasicDBObject, but why I need to do it if I implemented MongoMappingConverter.