How to make Java work with SQL Server?

Question

I know this is a basic question, but I can\'t seem to find an answer and I apologize, if this question is way too stupid, but here we go:

I am supposed to work with

Answer 1

Do not put both the old sqljdbc.jar and the new sqljdbc4.jar in your classpath - this will make it (more or less) unpredictable which classes are being used, if both of those JARs contain classes with the same qualified names.

You said you put sqljdbc4.jar in your classpath - did you remove the old sqljdbc.jar from the classpath? You said "it didn't work", what does that mean exactly? Are you sure you don't still have the old JAR in your classpath somewhere (maybe not explicitly)?