System.ArgumentNullException: Value cannot be null. Parameter name: assemblyName

[Valerio Di Gregorio]

Product name: NServiceBus

Version: 4.7.5

Stacktrace:

System.ArgumentNullException: Value cannot be null.

Parameter name: assemblyName

   at System.Reflection.AssemblyName..ctor(String assemblyName)

   at NServiceBus.Hosting.Helpers.AssemblyScanner.FormatReflectionTypeLoadException(String fileName, ReflectionTypeLoadException e) in c:\BuildAgent\work\1b05a2fea6e4cd32\src\NServiceBus.Core\Hosting\Helpers\AssemblyScanner.cs:line 228

   at NServiceBus.Hosting.Helpers.AssemblyScanner.ScanAssembly(String assemblyPath, AssemblyScannerResults results) in c:\BuildAgent\work\1b05a2fea6e4cd32\src\NServiceBus.Core\Hosting\Helpers\AssemblyScanner.cs:line 167

   at NServiceBus.Hosting.Helpers.AssemblyScanner.GetScannableAssemblies() in c:\BuildAgent\work\1b05a2fea6e4cd32\src\NServiceBus.Core\Hosting\Helpers\AssemblyScanner.cs:line 80

   at NServiceBus.Configure.GetAssembliesInDirectory(String path, String[] assembliesToSkip) in c:\BuildAgent\work\1b05a2fea6e4cd32\src\NServiceBus.Core\Configure.cs:line 423

   at NServiceBus.Configure.With(String probeDirectory) in c:\BuildAgent\work\1b05a2fea6e4cd32\src\NServiceBus.Core\Configure.cs:line 219

   at NServiceBus.Configure.With() in c:\BuildAgent\work\1b05a2fea6e4cd32\src\NServiceBus.Core\Configure.cs:line 201

[...]

08:37:28,927 INFO  EurexEOBIPlayback_Playback1 ->  System.ArgumentNullException: Value cannot be null.

Parameter name: assemblyName

   at System.Reflection.AssemblyName..ctor(String assemblyName)

   at NServiceBus.Hosting.Helpers.AssemblyScanner.FormatReflectionTypeLoadException(String fileName, ReflectionTypeLoadException e) in c:\BuildAgent\work\1b05a2fea6e4cd32\src\NServiceBus.Core\Hosting\Helpers\AssemblyScanner.cs:line 228

   at NServiceBus.Hosting.Helpers.AssemblyScanner.ScanAssembly(String assemblyPath, AssemblyScannerResults results) in c:\BuildAgent\work\1b05a2fea6e4cd32\src\NServiceBus.Core\Hosting\Helpers\AssemblyScanner.cs:line 167

   at NServiceBus.Hosting.Helpers.AssemblyScanner.GetScannableAssemblies() in c:\BuildAgent\work\1b05a2fea6e4cd32\src\NServiceBus.Core\Hosting\Helpers\AssemblyScanner.cs:line 80

   at NServiceBus.Configure.GetAssembliesInDirectory(String path, String[] assembliesToSkip) in c:\BuildAgent\work\1b05a2fea6e4cd32\src\NServiceBus.Core\Configure.cs:line 423

   at NServiceBus.Configure.With(String probeDirectory) in c:\BuildAgent\work\1b05a2fea6e4cd32\src\NServiceBus.Core\Configure.cs:line 219

   at NServiceBus.Configure.With() in c:\BuildAgent\work\1b05a2fea6e4cd32\src\NServiceBus.Core\Configure.cs:line 201

[...]

Description:

            Feature.Enable<Sagas>();

            Configure.Serialization.Xml();

            Bus = Configure.With()

                    .DefaultBuilder()

                    .UseTransport<Msmq>()

                    .UnicastBus()

                    .InMemorySagaPersister()

                    .CreateBus();

Hi all,

I'm quite new with the framework, do you know what's wrong with this error? I can't get rid of it. :(

Thanks for the help!

[Mauro Servienti]

Are you using any tool, such as an Embedded RavenDB version, that dynamically generates assemblies in the bin directory?

.m

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[Valerio Di Gregorio]

Hi Mauro, no I'm not using any tool like that. Actually mine is a simple proof-of-concept that I embedded in our infrastructure, so at the moment I'm using the InMemoryPersistence.

[simon.cropp]

Anything interesting in your log file?

If not can you upload a repro somewhere?

[Valerio Di Gregorio]

I can't get an SSCCE, I'll try to see if I can redirect the NServiceBus log output to our infrastructure logging system, because as of now I don't have access to the NServiceBus output.

[Valerio Di Gregorio]

If this code:

            Feature.Enable<Sagas>();

            Configure.Serialization.Xml();

            Bus = Configure.With()

                    .DefaultBuilder()

                    .UseTransport<Msmq>()

                    .UnicastBus()

                    .InMemorySagaPersister()

                    .CreateBus();

Prints all the logs into AppDomain.CurrentDomain.BaseDirectory as described by http://docs.particular.net/nservicebus/logging/, then I have no nsb_log_*.txt.

[simon.cropp]

That page http://docs.particular.net/nservicebus/logging/ is version 5 specific. 

Here is the doco for v4 http://docs.particular.net/nservicebus/logging/nservicebus4-and-below

V4 has no default log file when self hosting. you need to enable it. This samples http://docs.particular.net/samples/logging/log4net-custom/ has version 4 examples

[Valerio Di Gregorio]

Thanks for the links. This is all I have into the log file:

07:52:01,853 ERROR System.InvalidOperationException: There is an error in XML document (92, 4). ---> System.ArgumentNullException: Value cannot be null.

Parameter name: assemblyName

   at System.Reflection.AssemblyName..ctor(String assemblyName)

   at NServiceBus.Hosting.Helpers.AssemblyScanner.FormatReflectionTypeLoadException(String fileName, ReflectionTypeLoadException e) in c:\BuildAgent\work\1b05a2fea6e4cd32\src\NServiceBus.Core\Hosting\Helpers\AssemblyScanner.cs:line 228

   at NServiceBus.Hosting.Helpers.AssemblyScanner.ScanAssembly(String assemblyPath, AssemblyScannerResults results) in c:\BuildAgent\work\1b05a2fea6e4cd32\src\NServiceBus.Core\Hosting\Helpers\AssemblyScanner.cs:line 167

   at NServiceBus.Hosting.Helpers.AssemblyScanner.GetScannableAssemblies() in c:\BuildAgent\work\1b05a2fea6e4cd32\src\NServiceBus.Core\Hosting\Helpers\AssemblyScanner.cs:line 80

   at NServiceBus.Configure.GetAssembliesInDirectory(String path, String[] assembliesToSkip) in c:\BuildAgent\work\1b05a2fea6e4cd32\src\NServiceBus.Core\Configure.cs:line 423

   at NServiceBus.Configure.With(String probeDirectory) in c:\BuildAgent\work\1b05a2fea6e4cd32\src\NServiceBus.Core\Configure.cs:line 219

   at NServiceBus.Configure.With() in c:\BuildAgent\work\1b05a2fea6e4cd32\src\NServiceBus.Core\Configure.cs:line 201

   at [...].NsbEndpoint..ctor() in c:\Users\[...]\NsbEndpoint.cs:line 28

[Valerio Di Gregorio]

And here is the code of my NsbEndpoint:

namespace [...]

{

    public class NsbEndpoint

    {

        public IStartableBus Bus { get; private set; }

        public NsbEndpoint()

        {

            SetLoggingLibrary.Log4Net(XmlConfigurator.Configure);

            Feature.Enable<Sagas>();

            Configure.Serialization.Xml();

            Bus = Configure.With()

                .DefaultBuilder()

                .UseTransport<Msmq>()

                .UnicastBus()

                .InMemorySagaPersister()

                .Log4Net()

                .CreateBus();

        }

        [...]

    }

}

[Mauro Servienti]

Hi Valerio,

On Tue, Apr 28, 2015 at 8:53 AM, Valerio Di Gregorio <valeriodigr...@gmail.com> wrote:

Thanks for the links. This is all I have into the log file:

07:52:01,853 ERROR System.InvalidOperationException: There is an error in XML document (92, 4). ---> System.ArgumentNullException: Value cannot be null.

What XML document is the exception referring to?

Can you show the config file? What is the content at line 92?

.m

[Valerio Di Gregorio]

Mauro, that's the point. I don't know what XML is that, it's not specified by the exception. The App.config file at line 92 has pre-existing log4net stuff in it which is not NServiceBus related:

91:   <layout type="log4net.Layout.PatternLayout">

92:      <conversionPattern value="%P{log4net:HostName}"/>

93:   </layout>

Moreover the null value is "assemblyName" which comes from an assembly scan. So I'm wondering why System.Reflection.AssemblyName..ctor() is called without a check on assemblyName null/empty values. I'll try to get more info about the error compiling the framework and debugging into it.

[Valerio Di Gregorio]

So the issue is that one dependency uses Google ProtoBuffers version X and a different dependecy uses version Y. So the second one overwrites version X with Y and NServiceBus fails loading them because of the version mismatch. Fusion logs helped me to understand that. Now I either have to fix this everywhere or find a way to tell NServiceBus to not dig into the mess and just do the job it is supposed to do. Any idea?

[Andreas Öhlund]

If those assemblies doesn't contain any message/messagehandlers you could just exclude them from the scanning

http://docs.particular.net/nservicebus/hosting/assembly-scanning#you-can-exclude-specific-assemblies-by-name-

would that work?

On Wed, Apr 29, 2015 at 12:48 PM, Valerio Di Gregorio <valeriodigr...@gmail.com> wrote:

So the issue is that one dependency uses Google ProtoBuffers version X and a different dependecy uses version Y. So the second one overwrites version X with Y and NServiceBus fails loading them because of the version mismatch. Fusion logs helped me to understand that. Now I either have to fix this everywhere or find a way to tell NServiceBus to not dig into the mess and just do the job it is supposed to do. Any idea?

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[simon.cropp]

As Andreas pointed out you should be able to exclude those assemblies to avoid the error. And good work using the Fusion log to diagnose the issue. As for "why NServiceBus not giving helpful logging" is seems we have a bug in our logging code. I have raised an issue to track it here https://github.com/Particular/NServiceBus/issues/2722

[Valerio Di Gregorio]

Thanks for the ticket Simon. I was able to get rid of the issue I had, but this brought me to the next exception. I'll investigate on that and perhaps I'll ask help if I get blocked again for too long time.

[Valerio Di Gregorio]

Yes that solved the issue. Thanks Andreas!

[Valerio Di Gregorio]

Simon, just a suggestion with the fix. I would also change:

07:52:01,853 ERROR System.InvalidOperationException: There is an error in XML document (92, 4). ---> System.ArgumentNullException: Value cannot be null.

With a more descriptive message as there are no XML documents involved into this. Maybe if you print out the assemblyPath variable (or whatever is named) the user can read which DLL caused the issue.