I have a class in a seperate dll which I want to remote. I have referenced
the class and registered it using a simple exe. I can connect to the class's
interface using Activator.GetOb ject and call it's methods. However, when I
use soapsuds to extract meta data, I get the following error:
Error: Unable to retrieve schema from url: http://localhost:1234/RemoteObject.soap?WSDL, The remote server returned an
error: (500) Internal Server Error.
Browser response is below. What am I doing wrong? Thanks.
System.NullRefe renceException: Object reference not set to an instance of an
object. at
System.Runtime. Remoting.Metada taServices.Real SchemaType.Reso lve(StringBuild e
r sb) at System.Runtime. Remoting.Metada taServices.XMLN amespace.Resolv e() at
System.Runtime. Remoting.Metada taServices.Wsdl Generator.Resol ve() at
System.Runtime. Remoting.Metada taServices.Wsdl Generator.Gener ate() at
System.Runtime. Remoting.Metada taServices.SUDS Generator.Gener ate() at
System.Runtime. Remoting.Metada taServices.Meta Data.ConvertTyp esToSchemaToStr e
am(ServiceType[] serviceTypes, SdlType sdlType, Stream outputStream) at
System.Runtime. Remoting.Metada taServices.SdlC hannelSink.Gene rateSdl(SdlType
sdlType, IServerResponse ChannelSinkStac k sinkStack, ITransportHeade rs
requestHeaders, ITransportHeade rs responseHeaders , Stream& outputStream) at
System.Runtime. Remoting.Metada taServices.SdlC hannelSink.Proc essMessage(ISer v
erChannelSinkSt ack sinkStack, IMessage requestMsg, ITransportHeade rs
requestHeaders, Stream requestStream, IMessage& responseMsg,
ITransportHeade rs& responseHeaders , Stream& responseStream) at
System.Runtime. Remoting.Channe ls.Http.HttpSer verTransportSin k.ServiceReques t
(Object state) at
System.Runtime. Remoting.Channe ls.SocketHandle r.ProcessReques tNow() 8  2700 
Hi, using soapsuds is not good idea. There are a lot of problems with
this. I'd recomend you to use abstract class or interface approach.
Sunny
In article <eW************ *@TK2MSFTNGP11. phx.gbl>, ri******@rogge. co.uk
says... I have a class in a seperate dll which I want to remote. I have referenced
the class and registered it using a simple exe. I can connect to the class's
interface using Activator.GetOb ject and call it's methods. However, when I
use soapsuds to extract meta data, I get the following error:
Error: Unable to retrieve schema from url:
http://localhost:1234/RemoteObject.soap?WSDL, The remote server returned an
error: (500) Internal Server Error.
Browser response is below. What am I doing wrong? Thanks.
System.NullRefe renceException: Object reference not set to an instance of an
object. at
System.Runtime. Remoting.Metada taServices.Real SchemaType.Reso lve(StringBuild e
r sb) at System.Runtime. Remoting.Metada taServices.XMLN amespace.Resolv e() at
System.Runtime. Remoting.Metada taServices.Wsdl Generator.Resol ve() at
System.Runtime. Remoting.Metada taServices.Wsdl Generator.Gener ate() at
System.Runtime. Remoting.Metada taServices.SUDS Generator.Gener ate() at
System.Runtime. Remoting.Metada taServices.Meta Data.ConvertTyp esToSchemaToStr e
am(ServiceType[] serviceTypes, SdlType sdlType, Stream outputStream) at
System.Runtime. Remoting.Metada taServices.SdlC hannelSink.Gene rateSdl(SdlType
sdlType, IServerResponse ChannelSinkStac k sinkStack, ITransportHeade rs
requestHeaders, ITransportHeade rs responseHeaders , Stream& outputStream) at
System.Runtime. Remoting.Metada taServices.SdlC hannelSink.Proc essMessage(ISer v
erChannelSinkSt ack sinkStack, IMessage requestMsg, ITransportHeade rs
requestHeaders, Stream requestStream, IMessage& responseMsg,
ITransportHeade rs& responseHeaders , Stream& responseStream) at
System.Runtime. Remoting.Channe ls.Http.HttpSer verTransportSin k.ServiceReques t
(Object state) at
System.Runtime. Remoting.Channe ls.SocketHandle r.ProcessReques tNow()
I would recommend switching to an abstract class or interface based
approach. See examples in my article here http://www.glacialcomponents.com/Art...D=RemoteObject
Allen Anderson http://www.glacialcomponents.com
mailto: allen@put my website url here.com
On Tue, 18 May 2004 08:44:27 +0100, "Richard Bell"
<ri******@rogge .co.uk> wrote: I have a class in a seperate dll which I want to remote. I have referenced
the class and registered it using a simple exe. I can connect to the class's
interface using Activator.GetOb ject and call it's methods. However, when I
use soapsuds to extract meta data, I get the following error:
Error: Unable to retrieve schema from url:
http://localhost:1234/RemoteObject.soap?WSDL, The remote server returned an
error: (500) Internal Server Error.
Browser response is below. What am I doing wrong? Thanks.
System.NullRef erenceException : Object reference not set to an instance of an
object. at
System.Runtime .Remoting.Metad ataServices.Rea lSchemaType.Res olve(StringBuil de
r sb) at System.Runtime. Remoting.Metada taServices.XMLN amespace.Resolv e() at
System.Runtime .Remoting.Metad ataServices.Wsd lGenerator.Reso lve() at
System.Runtime .Remoting.Metad ataServices.Wsd lGenerator.Gene rate() at
System.Runtime .Remoting.Metad ataServices.SUD SGenerator.Gene rate() at
System.Runtime .Remoting.Metad ataServices.Met aData.ConvertTy pesToSchemaToSt re
am(ServiceTy pe[] serviceTypes, SdlType sdlType, Stream outputStream) at
System.Runtime .Remoting.Metad ataServices.Sdl ChannelSink.Gen erateSdl(SdlTyp e
sdlType, IServerResponse ChannelSinkStac k sinkStack, ITransportHeade rs
requestHeaders , ITransportHeade rs responseHeaders , Stream& outputStream) at
System.Runtime .Remoting.Metad ataServices.Sdl ChannelSink.Pro cessMessage(ISe rv
erChannelSinkS tack sinkStack, IMessage requestMsg, ITransportHeade rs
requestHeaders , Stream requestStream, IMessage& responseMsg,
ITransportHead ers& responseHeaders , Stream& responseStream) at
System.Runtime .Remoting.Chann els.Http.HttpSe rverTransportSi nk.ServiceReque st
(Object state) at
System.Runtime .Remoting.Chann els.SocketHandl er.ProcessReque stNow()
Thanks for your comments, but I want to use the 'new' operator and configure
remoting using the standard framework. The reason it was failing is that my
object exposed an interface which was contained in a separate dll. I have
moved the interface to the server dll and it all works fine. However, I have
2 questions for the group
1) I understood from the Soapsuds docs that classes for the assembly and
referenced assemblies would be imported. This does not appear to be the
case. Can this be forced?
2) Attributes assigned to the objects are not exported in the output
assembly/code. Is it possible to enforce this?
Thanks.
Hi Richard,
as a general, I do not recomend to use soapsuds. It's the less scalable
method. Try using abstract classes or interfaces in a separate assembly.
Sunny
In article <#1************ **@TK2MSFTNGP10 .phx.gbl>, ri******@rogge. co.uk
says... Thanks for your comments, but I want to use the 'new' operator and configure
remoting using the standard framework. The reason it was failing is that my
object exposed an interface which was contained in a separate dll. I have
moved the interface to the server dll and it all works fine. However, I have
2 questions for the group
1) I understood from the Soapsuds docs that classes for the assembly and
referenced assemblies would be imported. This does not appear to be the
case. Can this be forced?
2) Attributes assigned to the objects are not exported in the output
assembly/code. Is it possible to enforce this?
Thanks.
Why is it less scaleable?
Lets say, that you find some problem in the server object. You have to
correct this. And now you have a new class. All remoting clients will
fail to use it, unless you recompile them with the new meta data,
extracted from the new class. Even replacing only 50 clients can be a
lot of pain.
And if to search in the newsgroups, you will find a lot of problems
experienced by people, using soapsuds.
Using interfaces, if you do not change the interface assembly, clients
does not have to be touched, they will work with every class which
implements the well known interface.
Or, let's say, you are ready for version 2. You create a new interface,
which extends the previous one. And your server object implements it as
well. Now, the old clients will continue to work using the old
interface, and the new clients, with richer functionality, will use the
new one.
I think that only these 2 reasons are enough.
Sunny
In article <#8************ **@TK2MSFTNGP12 .phx.gbl>, ri******@rogge. co.uk
says... Why is it less scaleable?
OK, thanks, but I do not think that your comments relate to saleability but
to deployment. Even so, I am not sure that I entirely agree with you.
1. You can control how versioning is implemented in the serialization of
calls using the 'includeVersion s' and 'strictBinding' attributes of the
formatter element. As long as you do not change the signature of the method
and configure versioning correctly, server rebuilds need not break the
client. The server side execution of Invoke should continue to work. You
only have issues with strongly named assemblies where versioning appears to
be enforced for the binary formatter, but you can get round this, if you
want to (but should you?).
2. Using the 'new' operator does not preclude you from using
interfaces/abstract classes on the client. The issue relates to how the
reference to the remote proxy is obtained. In the 'interface only case', the
location of the 'CoClass' is either hardcoded into the app or obtained by
some custom method. In the case of soapsuds, it is obtained by the framework
method.
3. You are not precluded from implementing a v2 interface type framework
using soapsuds. However, using the 'interface only method' can cause
problems in deployment. You cannot force 'old' clients to use the 'old'
assembly since the 'new' assembly will be listening on the same socket the
'old' client is talking to, and, you might want to (ie back to DLL hell).
The Soapsuds framework does allow you to control versioning precisely. In
fact I believe that it was designed with that intent in mind.
So there are pros and cons. However, it seems to me that soapsuds satisfies
the "location transparency" goal of a remoting framework in that neither the
server nor client objects need to know whether they are being remoted or in
fact whether they are being called by a remote object at all.
Its more of a deployment issue as opposed to a scalability issue isnt it ;)
Sunny wrote: Lets say, that you find some problem in the server object. You have to
correct this. And now you have a new class. All remoting clients will
fail to use it, unless you recompile them with the new meta data,
extracted from the new class. Even replacing only 50 clients can be a
lot of pain.
And if to search in the newsgroups, you will find a lot of problems
experienced by people, using soapsuds.
Using interfaces, if you do not change the interface assembly, clients
does not have to be touched, they will work with every class which
implements the well known interface.
Or, let's say, you are ready for version 2. You create a new interface,
which extends the previous one. And your server object implements it as
well. Now, the old clients will continue to work using the old
interface, and the new clients, with richer functionality, will use the
new one.
I think that only these 2 reasons are enough.
Sunny
In article <#8************ **@TK2MSFTNGP12 .phx.gbl>, ri******@rogge. co.uk
says...
Why is it less scaleable?
--
Regards,
Dilip Krishnan
MCAD, MCSD.net
dilipdotnet at apdiya dot com This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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