Re: JDBC connection problem - Mailing list pgsql-jdbc

Brian,

So my guess is that you can connect to the lowercase_test database on that machine.

if so, rename the RW_GEO to lower case. UPPER CASE really is an impedance mismatch on postgresql ( in other words don't do it) .

Dave

On 5-Feb-08, at 11:02 AM, Brian Tomaszewski wrote:

Dave,

Thanks for the reply, answers below:

On Feb 5, 2008 10:39 AM, Dave Cramer <pg@fastcrypt.com> wrote:

Brian,

So to be clear you are using jdbc:postgresql://localhost:5432/dbname 

on both your windows box and your linux box.

yes - it works on windows but not on linux. I even tried adding useSSL=true to the connection string and that didn't make a difference

Both machines have copies of the database locally ?

yes
 

what does the output of psql -l show on the debian box,

          List of databases
      Name      |  Owner   | Encoding
----------------+----------+----------
 RW_GEO         | postgres | UTF8
 lowercase_test | postgres | UTF8
 postgres       | postgres | LATIN1
 template0      | postgres | LATIN1
 template1      | postgres | LATIN1
(5 rows)

and is it listening on a tcpip port ?

Does "it" refer to the postgres server? if so, how do I check that it is listening on a TCPIP port? (sorry if this sounds trivial, I am relatively new to postgres on linux)

Thanks!

Brian

 

Dave 

On 5-Feb-08, at 9:31 AM, Brian Tomaszewski wrote:

Dave,

Thanks for the quick reply.

I am using java code like what you show to connect to postresql in my app

And that's part of the weird thing - java connect code with postgres database on windows is fine, same java code trying to connect to to a postgres database  on debian, can't connect or even see the database for that matter

Could it be a driver version issue?

Thanks again for your time

Brian



On Feb 5, 2008 8:47 AM, Dave Cramer <pg@fastcrypt.com> wrote:

Brian, 

I have no idea why you can't connect but I have comments about running tomcat and pg below

write a very small program which attempts to connect outside of tomcat

ie 

main

class.forName("org.postgresql.Driver")

Driver.getConnection(....

and see if that connects

see below for more comments

On 5-Feb-08, at 8:17 AM, Brian Tomaszewski wrote:

Guy,

Thanks for the response. See below for clarifications:

On Feb 5, 2008 1:05 AM, Guy Rouillier <guyr-ml1@burntmail.com> wrote:

Brian Tomaszewski wrote:
> I am having trouble connecting to a psql database running on  Debian
> GNU/Linux system
>
> The version of psql I am using in the system is 8.2.6.
>
> No matter what I do, I continually am getting the error:
>
> /Backend start-up failed: FATAL:  database "RW_GEO" does not exist
>
> /when my JDBC component tries to connect using a URL like this:
>
> jdbc:postgresql://localhost:5432/RW_GEO
>
> from a tomcat app
>
> I have confirmed that the database RW_GEO does in fact exist as I can
> see/query tables from it from psql.
>
> Also, when I run my app on my development machine (windows), I can
> connect via tomcat with no problems to my local psql server.

I'm trying to follow your runtime environment, but some pieces are
missing.  When you say you can query the database running on Debian
using psql, is that psql running on your Windows box or on the Debian
box?

I can run psql (the command line tool) on Debian and using the psql tool on Debian see/query the database that is always being reported as not existing when the app connects.

On my Windows box, I use pgAdmin interface. I also develop the Java Code for the app on windows and then upload it to the server to run/tes. Also, I built the inital database on the windows box, and then uploaded and restored it to the debian postgres running there


 

 I don't think this has anything to do with JDBC.  The URL you show
above has "localhost" as the server for the DB.  That's probably not
right, is it?  I wouldn't think you'd have Tomcat running on your
database server.

yes, we do have tomcat running on the database server (i.e the debian server), is that a bad thing?

It's not good, since tomcat and postgresql both like memory. However you may not have a choice. 

My thought with using localhost on the debain is that is that is how the tomcat could easily connect

So, run psql from whatever box is running Tomcat, and figure out how to
connect it to your DB server.  

I have done this on windows. Every thing for my app on windows is on the same box (tomcat, postgres etc). When I port the app up to the debian server, the connection fails

 

Once you've done that, you should be able
to just transfer the connection settings to JDBC.  I'm anticipating once
you attempt to do that, you'll encounter a connection error.  That's
because you need to update pg_hba.conf to allow access to your database
from remote hosts.

Ok, so is the real issue then having tomcat and postgres on the same server? Should they be physically separate? If they are not, what do you need to consider in terms of configuration

No, it's no real issue, other than a resource sharing problem.

Dave

Thank you for your time

Brian
 

--
Guy Rouillier

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