servlets and JDBC (postgresql 7.2)

I would like to establish a postgresql database
connection from within a Java Servlet, using
the Apache Tomcat server.
Unfortunately, I get the error: "No suitable driver
found"
When trying to connect a Java application to the
same database (same settings (same classpath)),
everything works fine.
Is there something special about JDBC and servlets,
that might have caused this error?

Thanks,
Frederick



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