Can't view any project data due to missing .fnm file in index folder

[Bill McBride]

Jira users could not view any projects data due to following error:

> org.apache.commons.lang.exception.NestableRuntimeException: java.io.FileNotFoundException: C: Jira index issues segments (The system cannot find the file specified)

> I copied the segments file from last backup and now the following error is reported in the C: Windows system32 Atlassian log

> org.apache.commons.lang.exception.NestableRuntimeException: java.io.FileNotFoundException: C: Jira index issues _5zd.fnm (The system cannot find the file specified)

> This missing file is not found in any backups. Please advise on a fix or recovery method

[Faisal · Accepted solution]

Hi Bill,

It looks like the Lucene file may have been corrupted, hence the mentioned error occured. Please note that it shouldn't be possible for you to copy the indexes data from one JIRA instance, to be used by another instance.

Anyway as an attemp to fix the problem, can you kindly try the following:
- Shut down JIRA
- Go to $JIRA_HOME/caches directory
- Remove the indexes folder and it's content
- Startup JIRA
- Perform full reindexing by going to Administration > Indexing

I hope that this will help!