Parameter not passed to controller - Spring - spring-mvc

Question

I am at wits end here. This seems a very trivial thing but its not working. I have a jsp page that passes back to the server a Long (tournamentId) and a list of Objects.
When I post the form, the list is passed properly, but the Long member comes back as null, even though I can see it was sent.
The jsp:
<form:form method="post" action="addBets" modelAttribute="gwbCollection">
<c:choose>
<c:when test="${gwbCollection.tournamentState == 'CLOSED_FOR_BETS'}">
<br>
</c:when>
</c:choose>
<input name="tournamentId" value="${gwbCollection.tournamentId}" type="hidden"/>
<table>
<tr>
<td>Side A:</td>
<td>Score A:</td>
<td>Side B:</td>
<td>Score B:</td>
</tr>
<c:forEach var="gwb" items="${gwbCollection.games}" varStatus="status">
<tr>
<td><input name="games[${status.index}].game.gameId" value="${gwb.game.gameId}" type="hidden"/>
<input name="games[${status.index}].userId" value="${gwb.userId}" type="hidden"/>
<input name="games[${status.index}].game.tournamentId" value="${gwb.game.tournamentId}" type="hidden"/>
<input name="games[${status.index}].bet.betId" value="${gwb.bet.betId}" type="hidden"/>
${gwb.game.sideA}</td>
<td><input name="games[${status.index}].bet.scoreA" value="${gwb.bet.scoreA}"/></td>
<td>${gwb.game.sideB}</td>
<td><input name="games[${status.index}].bet.scoreB" value="${gwb.bet.scoreB}"/></td>
</tr>
</c:forEach>
</table>
<c:choose>
<c:when test="${gwbCollection.tournamentState == 'OPEN_FOR_BETS'}">
<input type="submit" />
</c:when>
</c:choose>
</form:form>
The Controller:
#Controller
#SessionAttributes
public class BetController {
...
#RequestMapping(value = "/addBets", method = RequestMethod.POST)
public String addBet(#ModelAttribute("gwbCollection") GamesWithBetsCollection gwbCollection) {
List<Bet> bets = gwbUtil.getBets(gwbCollection);
...
}
And finally, GamesWithBetsCollection:
public class GamesWithBetsCollection {
private TournamentState tournamentState;
private Long tournamentId;
private List<GameWithBet> games;
public GamesWithBetsCollection() {
}
public List<GameWithBet> getGames() {
return games;
}
public void setGames(List<GameWithBet> games) {
this.games = games;
}
public TournamentState getTournamentState() {
return tournamentState;
}
public void setTournamentState(TournamentState tournamentState) {
this.tournamentState = tournamentState;
}
public Long getTournamentId() {
return tournamentId;
}
public void setTournamentId(long tournamentId) {
this.tournamentId = tournamentId;
}
}

Answer 1

Nickdos - WOW! That is the answer! Beautiful catch!
To recap - the field "tournamentId" is defined as Long (object), but the setter has long (primitive) as parameter. Changing it to Long(object) did the trick.
Thanks again Nickdos!