Java-JDBC-MySQL Error
- by LeonardPeris
I'm trying to get my java program to talk to a MySQL DB.
So i did some reading and downloaded MySQL Connector/J. I've extracted it into my home directory ~. Here are the contents.
user@hamster:~$ ls
LoadDriver.class LoadDriver.java mysql-connector-java-5.1.18-bin.jar
The contents of LoadDriver.java are
user@hamster:~$ cat LoadDriver.java
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
// Notice, do not import com.mysql.jdbc.*
// or you will have problems!
public class LoadDriver {
public static void main(String[] args) {
try {
// The newInstance() call is a work around for some
// broken Java implementations
Class.forName("com.mysql.jdbc.Driver").newInstance();
} catch (Exception ex) {
System.out.println(ex);
}
}
}
The contents are the same from http://dev.mysql.com/doc/refman/5.1/en/connector-j-usagenotes-basic.html#connector-j-usagenotes-connect-drivermanager with the only change that the Exception is being printed to console in the catch block.
I compile it as follows
leonard@hamster:~$ javac LoadDriver.java
When I try to execute it, the following is the ouput.
leonard@hamster:~$ java LoadDriver
java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
This output is consistent with the executing command, but when trying to run it with the prescribed CLASSPATH method I run into the following issue.
leonard@hamster:~$ java -cp /home/leonard/mysql-connector-java-5.1.18-bin.jar LoadDriver
Exception in thread "main" java.lang.NoClassDefFoundError: LoadDriver
Caused by: java.lang.ClassNotFoundException: LoadDriver
at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
Could not find the main class: LoadDriver. Program will exit.
Am I missing something? How do I get MySQL's own code samples running.
