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Re: rmi vs cajo
From: |
Andrew Haley |
Subject: |
Re: rmi vs cajo |
Date: |
Tue, 13 Sep 2005 15:03:52 +0100 |
Mark Wielaard writes:
>
> While playing a bit with Cajo
> (http://wiki.java.net/bin/view/Communications/ProxyUsage) I got the
> following error:
>
> java.lang.NullPointerException
> at gnu.cajo.invoke.Remote.hashCode (Remote.java:510)
> at java.util.Hashtable.hash (Hashtable.java:822)
> at java.util.Hashtable.put (Hashtable.java:432)
> at gnu.java.rmi.server.UnicastServer.exportObject (UnicastServer.java:66=
> )
> at gnu.java.rmi.server.UnicastServerRef.exportObject (UnicastServerRef.j=
> ava:110)
> at java.rmi.server.UnicastRemoteObject.exportObject (UnicastRemoteObject=
> .java:83)
> at java.rmi.server.UnicastRemoteObject.<init> (UnicastRemoteObject.java:=
> 69)
> at gnu.cajo.invoke.Remote.<init> (Remote.java:486)
> at gnu.cajo.utils.ItemServer.bind (ItemServer.java:206)
> at ProxyTest.main (ProxyTest.java:38)
>
> It seems we are to eager to export the Remote object immediately (from
> the constructor). We want to put it in a Hashtable and call hasCode(),
> but for the cajo Remote object the item field used to calculate the
> hashCode() hasn't been set yet so that gives a NullPointerException.
Isn't this a simple failure by gnu.cajo.invoke.Remote to satisfy the
contract for hashCode()? As I understand it, hashCode() should not
throw any exception.
Andrew.
- rmi vs cajo, Mark Wielaard, 2005/09/11
- Re: rmi vs cajo,
Andrew Haley <=