call or reply toward unregistered client

[Yohann Granet]

Hi,

I work with the JSAMP framework (0.3) to implement a package manager in 
Java.

During my tests I found out that a "call" or a "reply" toward an 
unregistered client throws an Exception
(the class involved is org.astrogrid.samp.xmlrpc.XmlRpcHubConnection)

here, the trace for a "call":
org.astrogrid.samp.client.SampException: -9999: 
org.astrogrid.samp.hub.HubServiceException: Client c6 is no longer 
registered
    at 
org.astrogrid.samp.xmlrpc.XmlRpcHubConnection.rawExec(XmlRpcHubConnection.java:187)
    at 
org.astrogrid.samp.xmlrpc.XmlRpcHubConnection.exec(XmlRpcHubConnection.java:170)
    at 
org.astrogrid.samp.xmlrpc.XmlRpcHubConnection.call(XmlRpcHubConnection.java:135)
    ...

and here for a "reply":
org.astrogrid.samp.client.SampException: -9999: 
org.astrogrid.samp.hub.HubServiceException: Client c5 is no longer 
registered
    at 
org.astrogrid.samp.xmlrpc.XmlRpcHubConnection.rawExec(XmlRpcHubConnection.java:187)
    at 
org.astrogrid.samp.xmlrpc.XmlRpcHubConnection.exec(XmlRpcHubConnection.java:170)
    at 
org.astrogrid.samp.xmlrpc.XmlRpcHubConnection.reply(XmlRpcHubConnection.java:153)
    ...

I think that an attempt to call (or reply) an absent client shouldn't 
cause an Exception launching...
Exceptions are not there to manage particular (but "normal") cases

I think that, instead of an Exception, a "null" returned or a specific 
message would be preferable

I don't know how this case is managed by other frameworks...
some ideas or suggestions maybe?


    Yohann Granet