Java communication with JavaDB classNotFoundException

Question

I'm trying to make a Java program that can communicate with JavaDB. I've made the Database class, started a server and made a tiny client program to check if they would communicate.

The program crashes when i try to run it, giving a class not found exception at the line where i try to set the database driver. I googled it and found that this error appears if derbyclient.jar and derby.jar are not found in the classpath. I also read that the scripts setNetworkClientCP and setNetworkServerCP found in the db directory would set these in the classpath. I found the scripts, ran them, and checked to make sure the classpath got updated, but i still get the same error. Does anyone know what the problem might be?

EDIT: SOLVED - i just realized that i need to include the derbyclient.jar in the NetBeans project library.

Are you using any IDE to run your code? How are you setting the classpath? Also, please paste the error your getting(the trace). — Aninda Bhattacharyya
– Aninda Bhattacharyya, Commented Mar 11, 2015 at 17:25

User892313 · Accepted Answer · 2015-03-11 17:36:52Z

I'm using NetBeans and the built in JavaDB. I set the classpath by using the scripts that i mentioned above, and upon checking the classpath i found these entries:

%DERBY_INSTALL%\lib\derbyclient.jar;
%DERBY_INSTALL%\lib\derby.jar;
%DERBY_INSTALL%\lib\derbytools.jar;
%DERBY_INSTALL%\lib\derbynet.jar;

The Error:

java.lang.ClassNotFoundException: org.apache.derby.jdbc.ClientDriver
at java.net.URLClassLoader$1.run(URLClassLoader.java:372)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:360)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:260)
at Database.<init>(Database.java:14)
at TestKlient.main(TestKlient.java:8)

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