[MapDB] should just create a default directory and data store if it doesn't already exist

[rkoshak]

Expected Behavior

When using MapDB on a new openHAB 2 install it should create missing parent folders for the path to its persistence files instead of throwing an error in the logs.

Current Behavior

When migrating to a brand new openHAB 2 install and first starting up MapDB persistence an error gets thrown in the logs complaining about the parent directory not existing.

2016-09-24 12:14:59.335 [ERROR] [org.openhab.persistence.mapdb ] - [org.openhab.persistence.mapdb(194)] The activate method has thrown an exception java.io.IOError: java.io.IOException: Parent folder does not exist: /opt/openhab2/userdata/persistence/mapdb/storage.mapdb

To correct the error one need only manually create the persistence/mapdb folder.

This may primarily be a problem with openHAB 2 manual installs only as I saw it when setting up openHAB 2 in Docker and this thread is using paths that imply a manual install.

Possible Solution

Have the binding create missing parent directories if they are missing.

Steps to Reproduce (for bugs)

1. Stop openHAB 2
2. Move or remove the userdata/persistence/mapdb folder
3. Start openHAB 2

Context

Initial setup and configuration of openHAB 2. It was an unexpected, if easily manually mitigated error.

Your Environment

• Version used: openHAB 2, latest snapshot on Docker image, linked to thread above is using some openHAB 2 apparently manually installed
• Official Docker Image, not sure about linked to thread
• Ubuntu 16.1 based OS

[9037568]

As far as I can tell this feature has existed at least since 1.7.

Anyone have a good debug log?

See referenced issue.

[9037568]

I have a code change ready that should fix this. Would someone like to try out this test jar?

The code change is in my fork. If someone can verify the fix, I'll create a PR.