On 12-11-2020 20:31, Rob Sargent wrote:
> thinking these forums like bottom posting
>
> From my war file (which I explode)
>
> WEB-INF/lib/postgresql-42.2.18.jar
If the JDBC driver is included in the WAR, then you need to explicitly
load the driver with `Class.forName("org.postgresql.Driver")`, because
automatic driver loading doesn't work when the driver is on an web
application classpath; it will only work if the driver is on the initial
classpath (ie in Tomcats lib folder).
The second attempt likely works because you or your code did something
that triggered the driver to load (ie directly or indirectly loading the
org.postgresql.Driver class).
That said, using `DriverManager.getConnection` in a web application is
generally not a good idea. For performance it is usually better to use a
connection pool (eg the one built-in in Tomcat, or a third-party lib
like HikariCP).
Mark
--
Mark Rotteveel
