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From Paul Hammant <Paul_Hamm...@yahoo.com>
Subject Re: Altrmi: additional facades not working
Date Wed, 26 Mar 2003 21:04:13 GMT
Peter,

>I'm back to working on Altrmi and I am able to retrieve a remote component
>via Altrmi lookup. I even can use methods of the published interface that
>use only standard Java types such as String etc. But as soon as a I use a
>method of one of the additional facades, that is methods that return or
>take a other custom interface it failes at runtime with a
>NullPointerException.
>
>Setup: Latest and greatest incubator-altri 0.9.2
>Pre-compiled proxy classes in jar, on server side altrmi-server-0.9.2.jar
>on client-side additionally altrmi-client-0.9.2.jar and the proxy classes
>jar.
>
>For testing purpose I added only those additional facades that are
>absolutely necessary because there was then someone mentioning that the
>order in which the facades have to be specified when generating the Altrmi
>proxies might have an influence. But I tried both orders, putting
>inherited interfaces first or last, no difference.
>
>Interface: SIMONDataSource
>Thus I have 3 additional facades:
>  SIMONObject
>  SIMONConnection
>  SIMONMessageGroup (inheriting from SIMONObject)
>  
>
First off, if SIMONMessageGroup is a more derived type of SIMONObject, 
it should be specified first in an array of additional facades.

>These are used in two function that I use in the SIMONDataSource interface.
>
>First interesting a method
>
>  SIMONConnection SIMONDataSource::connect(String user, String passwd)
>
>is called that works!
>The second method in the interface is also simple but does not work:
>
>  SIMONMessageGroup[] SIMONDataSource::getMessageGroups()
>  
>
Hmm, the order looks a good bet.

I have put another debugging line in for the NPE. (ServerMonitor 
called). See if it sheds more light (AltRMI 0.9.3)

- Paul

>Ok it is a array but that works in another case like String[] already.
>Only the combination of Array and custom facade does not work.
>
>Note that the SIMONMessageGroup as well as the SIMONConnection interfaces
>only contain void method() methods so simplizissimo.
>
>The exception follows, please note that is called from Cocoon so some
>non-Altrmi stuff around:
>---
>Caused by: java.lang.NullPointerException: Null pointer exception,
>processing methodgetMessageGroups()
>	at
>org.apache.altrmi.server.impl.adapters.InvocationHandlerAdapter.handleInvocation(InvocationHandlerAdapter.java:232)
>	at
>org.apache.altrmi.server.impl.AbstractServer.handleInvocation(AbstractServer.java:184)
>	at
>org.apache.altrmi.server.impl.rmi.RmiInovcationAdapter.handleInvocation(RmiInovcationAdapter.java:102)
>	at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
>	at
>sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>	at java.lang.reflect.Method.invoke(Method.java:324)
>	at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:261)
>	at sun.rmi.transport.Transport$1.run(Transport.java:148)
>	at java.security.AccessController.doPrivileged(Native Method)
>	at sun.rmi.transport.Transport.serviceCall(Transport.java:144)
>	at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:460)
>	at
>sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:701)
>	at java.lang.Thread.run(Thread.java:536)
>	at
>sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteCall.java:247)
>	at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:223)
>	at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:133)
>	at
>org.apache.altrmi.server.impl.rmi.RmiInovcationAdapter_Stub.handleInvocation(Unknown
>Source)
>	at
>org.apache.altrmi.client.impl.rmi.RmiClientInvocationHandler.handleInvocation(RmiClientInvocationHandler.java:206)
>	at
>org.apache.altrmi.client.impl.DefaultProxyHelper.processObjectRequestGettingFacade2(DefaultProxyHelper.java:192)
>	at
>org.apache.altrmi.client.impl.DefaultProxyHelper.processObjectRequestGettingFacade(DefaultProxyHelper.java:161)
>	at
>AltrmiGeneratedsimonserver_Main.getMessageGroups(AltrmiGeneratedsimonserver_Main.java:200)
>	at com.vodafone.simon.cocoon.SIMONSource.refresh(SIMONSource.java:393)
>	at com.vodafone.simon.cocoon.SIMONSource.toSAX(SIMONSource.java:1097)
>	at
>org.apache.cocoon.generation.FileGenerator.generate(FileGenerator.java:143)
>---
>
>
>A build.xml snipplet:
>
><altrmiproxies genname="simonserver" ...
>interface="com.vodafone.simon.comp.SIMONDataSource"
>additionalfacades="com.vodafone.simon.api.SIMONObject,
>com.vodafone.simon.api.SIMONConnection,
>com.vodafone.simon.api.SIMONMessageGroup">
>  
>



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