When I try to save a new store with a PostGIS connection I get this error:
Error creating data store, check the parameters. Error message: Unable to obtain connection: Cannot create PoolableConnectionFactory (Something unusual has occurred to cause the driver to fail. Please report this exception.)
I know it's connecting to the server since it recognises right/wrong passwords and databases that are on it (entering wrong data gives errors connecting or finding the database). When everything is entered correctly it gives the error above. I've added the Tomcat error log for this as well. I hope you can fix this, if any additional information is needed let me know.
Debian Wheezy with Tomcat 8 and Oracle Java 1.8.0