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https://issues.apache.org/jira/browse/LUCENENET-324?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12788244#action_12788244
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Robert Jordan commented on LUCENENET-324:
-----------------------------------------
Mono does not throw an exception in this case. At least not in an version
released in the last 2 years.
> System.TypeInitializationException on linux
> -------------------------------------------
>
> Key: LUCENENET-324
> URL: https://issues.apache.org/jira/browse/LUCENENET-324
> Project: Lucene.Net
> Issue Type: Bug
> Environment: debian, vbnc, Visual Basic
> Reporter: Johannes von Drachenfels
> Priority: Minor
> Attachments: Constants.patch, Constants.patch
>
>
> Problem:
> When the environment variable "OS" is not present a failure occurs when
> initializing an Lucene.Net.Store.FSDirectory
> --------------------------------------------------------------------
> Exception:
> --------------------------------------------------------------------
> > ################################
> >
> > System.TypeInitializationException: An exception was thrown by the
> > type initializer for Lucene.Net.Store.FSDirectory --->
> > System.TypeInitializationException: An exception was thrown by the
> > type initializer for Lucene.Net.Util.Constants --->
> > System.NullReferenceException: Object reference not set to an instance
> > of an object
> >
> > at Lucene.Net.Util.Constants..cctor () [0x00000]
> >
> > --- End of inner exception stack trace ---
> >
> > at Lucene.Net.Store.FSDirectory..cctor () [0x00000]
> >
> > --- End of inner exception stack trace ---
> >
> > at ConsoleApplication1.Module1.Main () [0x00000]
> Solution:
> --------------------------------------------------------------------
> This is probably caused by this line in Lucene.Net.Util.Constants.cs:
> public static readonly System.String OS_NAME =
> System.Environment.GetEnvironmentVariable("OS");
> Try to assign some value to the env var "OS":
> OS=foo mono yourapp.exe
> Robert
> Workarround:
> --------------------------------------------------------------------
> 'bugfix:
> Dim OSSTRING As String = ""
> Try
> OSSTRING = System.Environment.GetEnvironmentVariable("OS")
> Catch ex As Exception
> OSSTRING = ""
> End Try
> If OSSTRING.Trim.Length = 0 Then
> System.Environment.SetEnvironmentVariable("OS", "linux")
> End If
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