Обсуждение: Suggestion for an improvement... ("database" part missing in URI)
Hello list, especially hello developers,
I am new to PostgreSQL and I tried the Postgresql jdbc driver for the
first time today, so please bear with me if the following sounds silly:
I have a suggestion for a small but probably helpful improvement for
the next release:
When I omit the "database" part in the database URI used in
DriverManager.getConnection("jdbc:postgresql://hostname/database", ... )
the error message is not very helpful:
----------------------------- snip -------------------------------------
Something unusual has occured to cause the driver to fail. Please report this exception: Exception:
java.lang.NullPointerException
Stack Trace:
java.lang.NullPointerException
at org.postgresql.Connection.openConnection(Connection.java:155)
at org.postgresql.Driver.connect(Driver.java:149)
at java.sql.DriverManager.getConnection(DriverManager.java:517)
at java.sql.DriverManager.getConnection(DriverManager.java:177)
at testpgsql.main(testpgsql.java:13)
End of Stack Trace
------------------------------------------------------------------------
and on the postmaster's stderr you get
DEBUG: pq_recvbuf: unexpected EOF on client connection
DEBUG: incomplete startup packet
This had me searching for some obscure error in my setup (networking, db
access permissions, and all that) for several hours until I finally
discovered that all that was missing was indeed the database name...
Couldn't this error be caught right at the beginning when the URI is read?
I guess this might be a quite common error and I'd say it would be a lot more
"user-friendly" (well, ok, programmer friendly) if there could be an
exception with a more meaningful message like for example "database name
missing in URI" or at least "invalid URI" instead of a SQLException triggered
by a NullPointerException...
Anyhow, I hope this message might at least be useful for others and
save them some time when they make the same mistake :-)
Cheers
Thomas
--
Thomas Haeberlen
Rechenzentrum Universitaet Stuttgart (RUS)
Abteilung Informationsdienste
Allmandring 30 , D-70569 Stuttgart
Email: haeberlen@rus.uni-stuttgart.de
Phone: +49 711 685 47 19 Fax: +49 711 678 76 26
Yes, you are correct, it shouldn't NPE when you don't put the database
in
Dave
> -----Original Message-----
> From: pgsql-jdbc-owner@postgresql.org
> [mailto:pgsql-jdbc-owner@postgresql.org] On Behalf Of Thomas Haeberlen
> Sent: Tuesday, March 19, 2002 1:43 PM
> To: pgsql-jdbc@postgresql.org
> Subject: [JDBC] Suggestion for an improvement... ("database"
> part missing in URI)
>
>
> Hello list, especially hello developers,
>
> I am new to PostgreSQL and I tried the Postgresql jdbc driver for the
> first time today, so please bear with me if the following
> sounds silly:
>
> I have a suggestion for a small but probably helpful
> improvement for the next release:
>
> When I omit the "database" part in the database URI used in
>
> DriverManager.getConnection("jdbc:postgresql://hostname/databa
> se", ... )
>
> the error message is not very helpful:
>
> ----------------------------- snip
> -------------------------------------
> Something unusual has occured to cause the driver to fail.
> Please report this exception: Exception:
> java.lang.NullPointerException Stack Trace:
>
> java.lang.NullPointerException
> at
> org.postgresql.Connection.openConnection(Connection.java:155)
> at org.postgresql.Driver.connect(Driver.java:149)
> at
> java.sql.DriverManager.getConnection(DriverManager.java:517)
> at
> java.sql.DriverManager.getConnection(DriverManager.java:177)
> at testpgsql.main(testpgsql.java:13)
> End of Stack Trace
>
> --------------------------------------------------------------
> ----------
>
> and on the postmaster's stderr you get
>
> DEBUG: pq_recvbuf: unexpected EOF on client connection
> DEBUG: incomplete startup packet
>
> This had me searching for some obscure error in my setup
> (networking, db access permissions, and all that) for several
> hours until I finally
> discovered that all that was missing was indeed the database name...
>
> Couldn't this error be caught right at the beginning when the
> URI is read?
>
> I guess this might be a quite common error and I'd say it
> would be a lot more "user-friendly" (well, ok, programmer
> friendly) if there could be an
> exception with a more meaningful message like for example
> "database name
> missing in URI" or at least "invalid URI" instead of a
> SQLException triggered
> by a NullPointerException...
>
> Anyhow, I hope this message might at least be useful for
> others and save them some time when they make the same mistake :-)
>
> Cheers
>
> Thomas
>
>
> --
> Thomas Haeberlen
> Rechenzentrum Universitaet Stuttgart (RUS)
> Abteilung Informationsdienste
> Allmandring 30 , D-70569 Stuttgart
> Email: haeberlen@rus.uni-stuttgart.de
> Phone: +49 711 685 47 19 Fax: +49 711 678 76 26
>
> ---------------------------(end of
> broadcast)---------------------------
> TIP 4: Don't 'kill -9' the postmaster
>
>
This should now be fixed in current sources.
thanks,
--Barry
Dave Cramer wrote:
> Yes, you are correct, it shouldn't NPE when you don't put the database
> in
>
> Dave
>
>
>>-----Original Message-----
>>From: pgsql-jdbc-owner@postgresql.org
>>[mailto:pgsql-jdbc-owner@postgresql.org] On Behalf Of Thomas Haeberlen
>>Sent: Tuesday, March 19, 2002 1:43 PM
>>To: pgsql-jdbc@postgresql.org
>>Subject: [JDBC] Suggestion for an improvement... ("database"
>>part missing in URI)
>>
>>
>>Hello list, especially hello developers,
>>
>>I am new to PostgreSQL and I tried the Postgresql jdbc driver for the
>>first time today, so please bear with me if the following
>>sounds silly:
>>
>>I have a suggestion for a small but probably helpful
>>improvement for the next release:
>>
>>When I omit the "database" part in the database URI used in
>>
>>DriverManager.getConnection("jdbc:postgresql://hostname/databa
>>se", ... )
>>
>>the error message is not very helpful:
>>
>>----------------------------- snip
>>-------------------------------------
>>Something unusual has occured to cause the driver to fail.
>>Please report this exception: Exception:
>>java.lang.NullPointerException Stack Trace:
>>
>>java.lang.NullPointerException
>> at
>>org.postgresql.Connection.openConnection(Connection.java:155)
>> at org.postgresql.Driver.connect(Driver.java:149)
>> at
>>java.sql.DriverManager.getConnection(DriverManager.java:517)
>> at
>>java.sql.DriverManager.getConnection(DriverManager.java:177)
>> at testpgsql.main(testpgsql.java:13)
>>End of Stack Trace
>>
>>--------------------------------------------------------------
>>----------
>>
>>and on the postmaster's stderr you get
>>
>>DEBUG: pq_recvbuf: unexpected EOF on client connection
>>DEBUG: incomplete startup packet
>>
>>This had me searching for some obscure error in my setup
>>(networking, db access permissions, and all that) for several
>>hours until I finally
>>discovered that all that was missing was indeed the database name...
>>
>>Couldn't this error be caught right at the beginning when the
>>URI is read?
>>
>>I guess this might be a quite common error and I'd say it
>>would be a lot more "user-friendly" (well, ok, programmer
>>friendly) if there could be an
>>exception with a more meaningful message like for example
>>"database name
>>missing in URI" or at least "invalid URI" instead of a
>>SQLException triggered
>>by a NullPointerException...
>>
>>Anyhow, I hope this message might at least be useful for
>>others and save them some time when they make the same mistake :-)
>>
>>Cheers
>>
>>Thomas
>>
>>
>>--
>>Thomas Haeberlen
>>Rechenzentrum Universitaet Stuttgart (RUS)
>>Abteilung Informationsdienste
>>Allmandring 30 , D-70569 Stuttgart
>>Email: haeberlen@rus.uni-stuttgart.de
>>Phone: +49 711 685 47 19 Fax: +49 711 678 76 26
>>
>>---------------------------(end of
>>broadcast)---------------------------
>>TIP 4: Don't 'kill -9' the postmaster
>>
>>
>
>
>
> ---------------------------(end of broadcast)---------------------------
> TIP 6: Have you searched our list archives?
>
> http://archives.postgresql.org
>