pgsql-jdbc and Java

Hello,
I developped my java project with Java NetBeans IDE,
the code connects to a postgreSQL database using the postgresql-8.1dev-400.jdbc3.jar driver, the project builds and executes correctly when using the IDE, however when trying to use the DOS command line as follow:
D:\java -jar projectpath/projectname.jar
the following error is generated:
Class not found !
java.lang.ClassNotFoundException: org.postgresql.Driver
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at logfilerewriter.Main.connectDb(Main.java:235)
at logfilerewriter.Main.main(Main.java:45)
I checked the class path, it is correctly set.
The error disapears if I don't call the method that connects to the database, which means that their is no CLASSPATH problem.

does somebody has the solution, or met this problem before...?

thank you in advance

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