Authorization using posgtgresql

Hello,
I'm quite new to xmpp but as an experienced Java programmer I chose Tigase for my XMPP server because it's Java. Now I'm having some problem getting it to authenticate using postgresql.

When I reconfigure it with derby, it works perfectly (BTW, I'm connecting with Psi client on Ubuntu) but when I change the configuration to authenticate with postgresql, it just reports 'not-authorized'. I've monitored the XML Console and discovered that connection breaks when it try to provide to the server's . Connection is via Digest-MD5 mechanism. I also checked-up the server log and discovered that no error was reported, that is, it connects to the database successfully.

I need to use it with postgresql so that it can integrate perfectly with my current project which is beign built on postgres. Please I'll really love a step-by-step process.

Thanks in advance. :D