Обсуждение: pgsql jdbc db connection weird behaviour
Hello PGSQL Community,
Venkateswar Reddy Melachervu
"...dare to dream, care to win..."
Love pgsql. But facing this weird problem (detailed below) for past couple of days with pgsql jdbc41 driver with tomcat 8 connection pooling on on jvm1.8 (all on x64 windows 8) with no resolution in sight for casting a jdbc db tomcat pooled connection to PGConnection hitting the wall.
I am sure not sure if I am doing something silly or it is the limitation of pgsql jdbc41 driver. Did any one face any such issue? Does any one know some way out for this?
Problem:
When I try to cast a DB Connection obtained using tomcat jdbc resource (pooled) to org.postgresql.PGConnection, of course after unwrapping it, execution is running into exception with the message: (java.lang.ClassCastException) java.lang.ClassCastException: org.postgresql.jdbc4.Jdbc4Connection cannot be cast to org.postgresql.PGConnection
Gotcha
Weird enough, if I do not use a pooled connection but create a single db stand-alone connection in the java code - dbCon = .getConnection(...) and cast this to org.postgresql.PGConnection - to my surprise - it's successful. Feels weird!
Environment
OS : WIndows 8 x64
JRE : java version "1.7.0_51"
Tomcat : 8.0 (x64)
Connection pooling : Tomcat jdbc connection pooling with database as JDBC resource (org.apache.tomcat.jdbc.pool.DataSourceFactory)
PostgreSQL server : v9.3 x64
Pgsql JDBC version : JDBC41 Postgresql Driver, Version 9.3-1101 (stored in Tomcat lib dir and linked from there to my project)
--
Regards,Venkateswar Reddy Melachervu
"...dare to dream, care to win..."
On Mar 30, 2014, at 12:10 AM, Venkateswar Reddy Melachervu <vmelachervu@gmail.com> wrote: > Hello PGSQL Community, > Love pgsql. But facing this weird problem (detailed below) for past couple of days with pgsql jdbc41 driver with tomcat8 connection pooling on on jvm1.8 (all on x64 windows 8) with no resolution in sight for casting a jdbc db tomcat pooledconnection to PGConnection hitting the wall. > > I am sure not sure if I am doing something silly or it is the limitation of pgsql jdbc41 driver. Did any one face any suchissue? Does any one know some way out for this? > > Problem: > When I try to cast a DB Connection obtained using tomcat jdbc resource (pooled) to org.postgresql.PGConnection, of courseafter unwrapping it, execution is running into exception with the message: (java.lang.ClassCastException) java.lang.ClassCastException:org.postgresql.jdbc4.Jdbc4Connection cannot be cast to org.postgresql.PGConnection Almost always this is caused by having more than one driver jar file available in your class path. In particular, bundlinga driver in the Tomcat lib/ directory as well as within your application itself is sure to cause problems. That’s where I would look first. Hope that helps, Steven
Steve,
I've checked it - appears no duplicate jdbc drivers..:-(
On Sun, Mar 30, 2014 at 10:59 AM, Steven Schlansker <stevenschlansker@gmail.com> wrote:
Almost always this is caused by having more than one driver jar file available in your class path. In particular, bundling a driver in the Tomcat lib/ directory as well as within your application itself is sure to cause problems.
On Mar 30, 2014, at 12:10 AM, Venkateswar Reddy Melachervu <vmelachervu@gmail.com> wrote:
> Hello PGSQL Community,
> Love pgsql. But facing this weird problem (detailed below) for past couple of days with pgsql jdbc41 driver with tomcat 8 connection pooling on on jvm1.8 (all on x64 windows 8) with no resolution in sight for casting a jdbc db tomcat pooled connection to PGConnection hitting the wall.
>
> I am sure not sure if I am doing something silly or it is the limitation of pgsql jdbc41 driver. Did any one face any such issue? Does any one know some way out for this?
>
> Problem:
> When I try to cast a DB Connection obtained using tomcat jdbc resource (pooled) to org.postgresql.PGConnection, of course after unwrapping it, execution is running into exception with the message: (java.lang.ClassCastException) java.lang.ClassCastException: org.postgresql.jdbc4.Jdbc4Connection cannot be cast to org.postgresql.PGConnection
That’s where I would look first.
Hope that helps,
Steven
Regards,
Venkateswar Reddy Melachervu
"...dare to dream, care to win..."
Even if there was a duplicate the Jdbc4Connection should be able to be cast.
On Sun, Mar 30, 2014 at 2:47 AM, Venkateswar Reddy Melachervu <vmelachervu@gmail.com> wrote:
Steve,I've checked it - appears no duplicate jdbc drivers..:-(On Sun, Mar 30, 2014 at 10:59 AM, Steven Schlansker <stevenschlansker@gmail.com> wrote:Almost always this is caused by having more than one driver jar file available in your class path. In particular, bundling a driver in the Tomcat lib/ directory as well as within your application itself is sure to cause problems.
On Mar 30, 2014, at 12:10 AM, Venkateswar Reddy Melachervu <vmelachervu@gmail.com> wrote:
> Hello PGSQL Community,
> Love pgsql. But facing this weird problem (detailed below) for past couple of days with pgsql jdbc41 driver with tomcat 8 connection pooling on on jvm1.8 (all on x64 windows 8) with no resolution in sight for casting a jdbc db tomcat pooled connection to PGConnection hitting the wall.
>
> I am sure not sure if I am doing something silly or it is the limitation of pgsql jdbc41 driver. Did any one face any such issue? Does any one know some way out for this?
>
> Problem:
> When I try to cast a DB Connection obtained using tomcat jdbc resource (pooled) to org.postgresql.PGConnection, of course after unwrapping it, execution is running into exception with the message: (java.lang.ClassCastException) java.lang.ClassCastException: org.postgresql.jdbc4.Jdbc4Connection cannot be cast to org.postgresql.PGConnection
That’s where I would look first.
Hope that helps,
Steven--Regards,
Venkateswar Reddy Melachervu
"...dare to dream, care to win..."
Hi All, I have the same problem. Did you managed to solve it? Can you give some advice? -- View this message in context: http://postgresql.nabble.com/pgsql-jdbc-db-connection-weird-behaviour-tp5797924p5901547.html Sent from the PostgreSQL - jdbc mailing list archive at Nabble.com.
Hi All, I have the same problem. Did you managed to solve it? Can you give some advice? -- View this message in context: http://postgresql.nabble.com/pgsql-jdbc-db-connection-weird-behaviour-tp5797924p5901547.html Sent from the PostgreSQL - jdbc mailing list archive at Nabble.com.
On 03/05/16 07:30, peter.penzov wrote: > Hi All, > I have the same problem. Did you managed to solve it? Can you give some > advice? > > > > -- > View this message in context: http://postgresql.nabble.com/pgsql-jdbc-db-connection-weird-behaviour-tp5797924p5901547.html > Sent from the PostgreSQL - jdbc mailing list archive at Nabble.com. > > Hi Peter, It is a very good idea to quote the relevant part of the email you are referring to, as others may have had the same problem, but your email is insufficient to identify the problem - referring to another web site is bad etiquette (except when the other web site is the topic!). Cheers, Gavin
On 03/05/16 07:30, peter.penzov wrote: > Hi All, > I have the same problem. Did you managed to solve it? Can you give some > advice? > > > > -- > View this message in context: http://postgresql.nabble.com/pgsql-jdbc-db-connection-weird-behaviour-tp5797924p5901547.html > Sent from the PostgreSQL - jdbc mailing list archive at Nabble.com. > > Hi Peter, It is a very good idea to quote the relevant part of the email you are referring to, as others may have had the same problem, but your email is insufficient to identify the problem - referring to another web site is bad etiquette (except when the other web site is the topic!). Cheers, Gavin