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FerRory
 Post subject: Check if List is empty without causing an exception.
PostPosted: Fri Jan 08, 2010 7:19 pm 
Newbie

Joined: Fri Oct 05, 2007 7:35 am
Posts: 8
Hi all,

I have a problem with getting size of a list.
I have two objects: Game and Team. The object Game has a List of Team objects.
The first time I add a Game I did not add a Team object. When I go back to my overview page I get an Exception because I call teams.size().
How can I check if the List is not filled without causing an Exception?
I tried is teams == null but that did not worked.

With kind regards,

Rory
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klogger
 Post subject: Re: Check if List is empty without causing an exception.
PostPosted: Sat Jan 09, 2010 6:33 am 
Beginner
Beginner

Joined: Thu Mar 27, 2008 8:49 am
Posts: 27
Do you mean you tried:

Code:
if(teams != null) System.out.println("teams size is [" + teams.size() + "]");


which should work fine. However, if you tried:

Code:
if(teams == null) System.out.println("teams size is [" + teams.size() + "]");


then you would get a null pointer when you called teams.size();

It's not really a Hibernate question either so it may have been better to post it in a general Java forum rather than a specialist one but I'll help if I can.
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FerRory
 Post subject: Re: Check if List is empty without causing an exception.
PostPosted: Sat Jan 09, 2010 7:25 am 
Newbie

Joined: Fri Oct 05, 2007 7:35 am
Posts: 8
I already fixed it. The problem was Lazy fetching I changed it to eager fetching.
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klogger
 Post subject: Re: Check if List is empty without causing an exception.
PostPosted: Sat Jan 09, 2010 8:20 am 
Beginner
Beginner

Joined: Thu Mar 27, 2008 8:49 am
Posts: 27
I thought my answer to your question was probably way too simple - my apologies. Glad you fixed it.
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