Обсуждение: Error in Programmer's Guide: JDBC
Greetings, In the release version of the Programmer's Guide, the chapter on JDBC (I used the one at http://www.postgresql.org/users-lounge/docs/7.0/programmer/jdbc6424.htm ) has an example of using the class loader to load the Postgres JDBC driver that uses the incorrect driver class name: Class.forName("postgresql.Driver"); This same error is repeated in the example for loading the driver using the command line switch: % java -Djdbc.drivers=postgresql.Driver example.ImageViewer The correct driver class (at least in the latest release with the filename jdbc7.0-1.2.jar, obtained from Peter Mount's site at http://www.retep.org.uk/postgres/download.html) should be org.postgresql.Driver, thus changing the docs to read Class.forName("org.postgresql.Driver"); and % java -Djdbc.drivers=org.postgresql.Driver example.ImageViewer Following the docs will cause the code to throw an exception with the message "java.lang.NoClassDefFoundError: postgresql.Driver". In the future, should we submit SGML diffs? Jeff
You should see the current development docs have this fixed. Sorry we didn't go back and fix 7.0 docs. > Greetings, > > In the release version of the Programmer's Guide, the chapter on JDBC > (I used the one at > http://www.postgresql.org/users-lounge/docs/7.0/programmer/jdbc6424.htm > ) > has an example of using the class loader to load the Postgres JDBC > driver that uses the incorrect driver class name: > > Class.forName("postgresql.Driver"); > > This same error is repeated in the example for loading the driver using > the command line switch: > > % java -Djdbc.drivers=postgresql.Driver example.ImageViewer > > The correct driver class (at least in the latest release with the filename > jdbc7.0-1.2.jar, obtained from Peter Mount's site at > http://www.retep.org.uk/postgres/download.html) should be > org.postgresql.Driver, thus changing the docs to read > > Class.forName("org.postgresql.Driver"); > > and > > % java -Djdbc.drivers=org.postgresql.Driver example.ImageViewer > > Following the docs will cause the code to throw an exception with the > message "java.lang.NoClassDefFoundError: postgresql.Driver". > > In the future, should we submit SGML diffs? > > Jeff > > > -- Bruce Momjian | http://candle.pha.pa.us pgman@candle.pha.pa.us | (610) 853-3000 + If your life is a hard drive, | 830 Blythe Avenue + Christ can be your backup. | Drexel Hill, Pennsylvania 19026
Quoting Jeff Duffy <jduffy@greatbridge.com>: > Greetings, > > In the release version of the Programmer's Guide, the chapter on JDBC > (I used the one at > http://www.postgresql.org/users-lounge/docs/7.0/programmer/jdbc6424.htm > ) > has an example of using the class loader to load the Postgres JDBC > driver that uses the incorrect driver class name: > > Class.forName("postgresql.Driver"); > > This same error is repeated in the example for loading the driver > using > the command line switch: > > % java -Djdbc.drivers=postgresql.Driver example.ImageViewer > > The correct driver class (at least in the latest release with the > filename > jdbc7.0-1.2.jar, obtained from Peter Mount's site at > http://www.retep.org.uk/postgres/download.html) should be > org.postgresql.Driver, thus changing the docs to read > > Class.forName("org.postgresql.Driver"); > > and > > % java -Djdbc.drivers=org.postgresql.Driver example.ImageViewer > > Following the docs will cause the code to throw an exception with the > message "java.lang.NoClassDefFoundError: postgresql.Driver". I'll fix that one shortly (doing another commit this morning anyhow). > In the future, should we submit SGML diffs? For the docs that might be an idea. PS: After 7.1, I'm thinking of rewriting the docs as the current jdbc docs are not that accurate to 7.1. Anyhow my main priority is to get the driver working for 7.1. Peter -- Peter Mount peter@retep.org.uk PostgreSQL JDBC Driver: http://www.retep.org.uk/postgres/ RetepPDF PDF library for Java: http://www.retep.org.uk/pdf/
Hmmm, it seems this has already been done (at least before the begining of last week). Peter Quoting Jeff Duffy <jduffy@greatbridge.com>: > Greetings, > > In the release version of the Programmer's Guide, the chapter on JDBC > (I used the one at > http://www.postgresql.org/users-lounge/docs/7.0/programmer/jdbc6424.htm > ) > has an example of using the class loader to load the Postgres JDBC > driver that uses the incorrect driver class name: > > Class.forName("postgresql.Driver"); > > This same error is repeated in the example for loading the driver > using > the command line switch: > > % java -Djdbc.drivers=postgresql.Driver example.ImageViewer > > The correct driver class (at least in the latest release with the > filename > jdbc7.0-1.2.jar, obtained from Peter Mount's site at > http://www.retep.org.uk/postgres/download.html) should be > org.postgresql.Driver, thus changing the docs to read > > Class.forName("org.postgresql.Driver"); > > and > > % java -Djdbc.drivers=org.postgresql.Driver example.ImageViewer > > Following the docs will cause the code to throw an exception with the > message "java.lang.NoClassDefFoundError: postgresql.Driver". > > In the future, should we submit SGML diffs? > > Jeff > > > -- Peter Mount peter@retep.org.uk PostgreSQL JDBC Driver: http://www.retep.org.uk/postgres/ RetepPDF PDF library for Java: http://www.retep.org.uk/pdf/