Serviio 1.5.2 with MySQL on ReadyNAS Duo/NV+ V2

I've been using Serviio since version 1.0, and have always been impressed. During version 1.2 I created a Serviio package for the ReadyNAS NV+/Duo v2 (ARM architecture) which has always run well, as long as it didn't need to transcode (due to both memory and CPU limitations).

Having recently refreshed my NAS, I decided to refresh my Serviio package to the latest version too. Whilst investigating the configuration options, I found reference to using alternative DBs (thereby possibly moving the DB out of memory, which seems a good idea on a low memory, massive storage device). However, all talk of instruction seems to have died out sometime in 2012-ish.

I've followed the instructions in http://forum.serviio.org/viewtopic.php?f=6&t=15531, less those concerning replacing the SQL files as the Serviio changelog states that mysql interaction has been supported since version 1.4.1-2 (can't remember which). However, when I try and access the console, all REST requests return HTTP 500 Error, as shown in my server log file below.

N.B. If I get rid of the -DdbURL=jdbc:mysql://... option, thereby reverting to Derby, everything works perfectly.

I was wondering two things:

• What do people think might be going wrong?
• If MySQL is a supported alternative to Derby in Serviio, why is there no information concerning using any alternative database software on the wiki?

  Code:

2015-08-12 14:33:49,502 INFO  [MediaServer] ------------------------------------------------------------------------
2015-08-12 14:33:49,524 INFO  [MediaServer] Serviio DLNA media streaming server v 1.5.2 (rev. 4b9ce176daa1)
2015-08-12 14:33:49,525 INFO  [MediaServer] Petr Nejedly 2009-2015
2015-08-12 14:33:49,526 INFO  [MediaServer] http://www.serviio.org
2015-08-12 14:33:49,526 INFO  [MediaServer]
2015-08-12 14:33:49,527 INFO  [MediaServer] Java 1.8.0_51-Oracle Corporation arm
2015-08-12 14:33:49,527 INFO  [MediaServer] OS Linux 2.6.31.8.nv+v2
2015-08-12 14:33:49,529 INFO  [MediaServer] File encoding: UTF-8
2015-08-12 14:33:49,534 INFO  [MediaServer] Headless mode enabled: true
2015-08-12 14:33:49,534 INFO  [MediaServer] User: admin
2015-08-12 14:33:49,534 INFO  [MediaServer] User home dir: /c/home/admin
2015-08-12 14:33:49,534 INFO  [MediaServer] Temp dir: /tmp
2015-08-12 14:33:49,535 INFO  [MediaServer] ------------------------------------------------------------------------
2015-08-12 14:33:51,618 INFO  [WebServer] Socket buffer set to 65535 bytes
2015-08-12 14:33:51,626 INFO  [RestletServer] Starting Restlet server (/rest) exposed on port 23423
2015-08-12 14:33:52,862 INFO  [RestletServer] Starting Restlet server (/cds) exposed on port 23424
2015-08-12 14:33:52,865 INFO  [RestletServer] Starting Restlet server (/mediabrowser) exposed on port 23424
2015-08-12 14:34:35,475 INFO  [DatabaseManager] Using MYSQL database language
2015-08-12 14:34:40,324 WARN  [ServiioStatusService] ExceptionInInitializerError occured. Returning error code 500 to the REST layer. Message: null
2015-08-12 14:34:42,491 WARN  [ServiioStatusService] NoClassDefFoundError occured. Returning error code 500 to the REST layer. Message: Could not initialize class org.serviio.config.Configuration
2015-08-12 14:34:47,016 WARN  [ServiioStatusService] NoClassDefFoundError occured. Returning error code 500 to the REST layer. Message: Could not initialize class org.serviio.config.Configuration
2015-08-12 14:34:47,223 WARN  [ServiioStatusService] NoClassDefFoundError occured. Returning error code 500 to the REST layer. Message: Could not initialize class org.serviio.config.Configuration
2015-08-12 14:34:47,381 WARN  [ServiioStatusService] NoClassDefFoundError occured. Returning error code 500 to the REST layer. Message: Could not initialize class org.serviio.config.Configuration
2015-08-12 14:34:48,408 WARN  [ServiioStatusService] NoClassDefFoundError occured. Returning error code 500 to the REST layer. Message: Could not initialize class org.serviio.config.Configuration
2015-08-12 14:34:48,428 WARN  [ServiioStatusService] PersistenceException occured. Returning error code 500 to the REST layer. Message: Cannot read all AccessGroups
2015-08-12 14:34:48,541 WARN  [ServiioStatusService] NoClassDefFoundError occured. Returning error code 500 to the REST layer. Message: Could not initialize class org.serviio.config.Configuration

If it helps, I'm also attaching the java-level error reporting logs from both the derby and mysql startup process:

serviio-derby-startup-err-log.txt

The start-up error log when using the Derby DB (identical to that of MySQL)

(4.9 KiB) Downloaded 479 times

... and those for console requests in each case:

serviio-derby-console-response-err-log.txt

The server error log when refreshing the Web UI when using the Derby DB

(1.04 KiB) Downloaded 495 times

serviio-mysql-console-response-err-log.txt

The server error log when refreshing the Web UI when using the MySQL DB

(33.14 KiB) Downloaded 474 times

As an update:

All is not well with Derby, just better than with MySQL. My post here http://forum.serviio.org/viewtopic.php?f=5&t=18386#p102125 has the details of other, potentially related issues that my installation seems to have regardless of DB used.