Splunk DB Connect: dbxquery failure; Failure starting process

[graytshirt]

RHEL6, Splunk 7.0, DB Connect 3.1.1, java 1.8, mysql jdbc connector

from the search.log:

11-07-2017 20:52:28.844 INFO  SearchParser - PARSING: | dbxquery query="select 1;" connection="Moog" 
11-07-2017 20:52:28.847 INFO  ISplunkDispatch - Not running in splunkd. Bundle replication not triggered.
11-07-2017 20:52:28.848 INFO  UserManager - Setting user context:  <snip>
11-07-2017 20:52:28.848 INFO  UserManager - Done setting user context: NULL -> <snip>
11-07-2017 20:52:28.848 INFO  ChunkedExternProcessor - Running process: /opt/splunk/etc/apps/splunk_app_db_connect/linux_x86_64/bin/command.sh -Dlogback.configurationFile\=../config/command_logback.xml -DDBX_COMMAND_LOG_LEVEL\=INFO -cp ../jars/command.jar com.splunk.dbx.command.DbxQueryCommand
11-07-2017 20:52:28.851 ERROR ChunkedExternProcessor - Failure starting process

a jdbc connection pool is made though, and the sqlexplorer does populate with data.

[graytshirt]

I did a fresh searchhead cluster install on RHEL7 and I had no issues running queries.

Final install:
RHEL7.1, Splunk 7.0.0, DB Connect 3.1.0, Java 1.8 build 151 (Oracle), Postgres JDBC 42.1.4

Just want to point out I switch from MySQL to PostgreSQL, this is an Architecture iteration, I was testing MySQL due to the previous errors.