Re: [JDBC] JDBC connection problem

Brian,

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

on both your windows box and your linux box.

Both machines have copies of the database locally ?

what does the output of psql -l show on the debian box, and is it listening on a tcpip port ?

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
>>
>> ---------------------------(end of
>> broadcast)---------------------------
>> TIP 7: You can help support the PostgreSQL project by donating at
>>
>> http://www.postgresql.org/about/donate
>>
>
>
Received on Tue Feb 5 10:52:36 2008