Re: [jgroups-users] In which case Rsp could be null?

Hi Eugene

MessageDispatcher.cast (which is used by
RpcDispatcher.callRemoteMethods) will return null if
real_dests.isEmpty(). In your case, that would happen if the cluster
has a single member.

Cheers
Dan


On Wed, Apr 6, 2016 at 6:32 PM, Questions/problems related to using
JGroups <[email protected]> wrote:
> Hello,
>
> I use RPC, and getting NullPointerException in very unusual place:
>
> Here is my code example:
>
> -----------------
>
> RspList<Boolean> result = dispatcher.callRemoteMethods(null, "fileExists",
> new Object[] { localFileName }, new Class[] { String.class },
> OPT_ALL_IN_5_SEC);
>
> for (Rsp<Boolean> rsp : result.values()) {
>
> if (rsp.getValue()) {
>
> -------------------
>
> the last line sometimes throws NPE. Looks like rsp is null.
>
> The fileExists method returns primitive boolean, so the result cannot be
> null by definition.
>
> Looks like something went wrong during the cluster communication.
>
> What could it be?
>
>
> Thanks,
>
> Eugene
>
>
> ------------------------------------------------------------------------------
>
> _______________________________________________
> javagroups-users mailing list
> [email protected]
> https://lists.sourceforge.net/lists/listinfo/javagroups-users
>

------------------------------------------------------------------------------