[LUCENENET-593] NullReferenceException in Linux

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Lucene.Net 4.8.0, Lucene.Net 5.0 PCL
• Fix Version/s: Lucene.Net 4.8.0
• Component/s: Lucene.Net Core

Environment

Linux (ubuntu 64 bit, maybe all linux variants)

• Assignee: Shad Storhaug
• Reporter: Warren Falk
• Created: 10/Aug/17 12:36
• Updated: 19/Oct/17 16:14
• Resolved: 19/Oct/17 16:14

Description

A NullReferenceException on any attempt to query in Linux (ubuntu x64 in my tests)

I was able to track this down to the following line in Constants.cs

public static readonly string OS_ARCH = GetEnvironmentVariable("PROCESSOR_ARCHITECTURE", "x86");

Sure enough, PROCESSOR_ARCHITECTURE is not set by default in ubuntu server x64 and when I set it, there is no failure.

I would fix this, but I'm not sure what this value is used for, so I am not sure what the appropriate behavior should be. Should we try to find the correct architecture here? And what is the correct string, "amd64", "x64", "x86_64"? Or do we really just want to know the value of that if it is actually not set, should we leave it blank? The issue is that the InfoWriter can't write a null, but it could write an empty string.

I'll submit a pull request if anyone can tell me what correct behavior should be.