Integration

No, it's not. That's what CNF exception is telling you.

Java ignores CLASSPATH environment variable. The right way to add a 3rd party JAR is to use the -classpath option on javac.exe and java.exe.

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I've been testing several possibilities and I've realized I've forgotten a detail: I'm trying to execute a program compressed in a jar file. When I run the connection-part of my code with the main class it doesn't fail, but when I do with the jar file it cannot find the driver class.

The connection-part of my code is:
//////////////////////////////////////////////////////////////////
import java.sql.Driver;
public class prueba {
static String DB_DRIVER = "oracle.jdbc.driver.OracleDriver";
public static void main(String [] args) {
try {
final Driver driver = (Driver) Class.forName(DB_DRIVER).newInstance();
System.out.println("Todo bien");
} catch (final Exception e) {
System.out.println("Se produjo un error al cargar el driver ["
+ DB_DRIVER + "] de la base de datos.");
System.out.println(e.toString() + "\r\n");
}
}
}
//////////////////////////////////////////////////////////////////

And the prompts I'm running are (Windows version):
java -classpath .;"E:\ojdbc14.jar" -jar prueba.jar
java -classpath .;"E:\ojdbc14.jar" prueba

The first one runs correctly, but the last one doesn't. What is the problem?

I've found the solution in other posts. My problem was that I was trying to specify an extra classpath for a jar execution, but jar executions don't recognise any extra classpaths, neither in the environment variable nor the same command-line. The solution is to copy the files needed to include in the classpath to the jre\lib\ext subdirectory from the jdk directory.