null value in map not allowed?

[aweber1nj]

Forgive me if it's somehow my implementation, but I get a
NullPointerException if I attempt to add a null value to a map (with a
valid, non-null key).

I don't think this is a general restriction of ConcurrentMap, but it
IS a limitation of a ConcurrentHashMap.

So maybe just a comment to add this in the documentation of Hazelcast
Maps if it is not there already? (I may have overlooked it, and if so
I apologize in advance for taking-up space in peoples' mailboxes.)

Thanks,
AJ

[Talip Ozturk]

Agreed. It is not impossible to support NULL values but for now it is not.

http://twitter.com/oztalip

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[Vladimir Dolzhenko]

according to contract of java.util.Map :
http://download.oracle.com/javase/6/docs/api/java/util/Map.html#put(K,
V)

NullPointerException - if the specified key or value is null and this
map does not permit null keys or values

I think it's enough to add to documentation that map doesn't permit
nulls (as Hashtable, ConcurrentHashMap etc do)