Error: invalid file 'java/lang/Object.class' (wrong version: 48, expected 4

hi all
ive installed jdk1.4.1 from jdk1.3 .
When i try to compile a java file i get this error.
Error: invalid file 'java/lang/Object.class' (wrong version: 48, expected 45)
anyone has any idea abt this.
im stuck :( pls help.
thanks
Jan

Did you uninstall 1.3 completely? Completely in the sense both jdk and jre.
You may get this error if you use javac of one version and the rt.jar of another version.
Sudha

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My PATH: %SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\Wbem;c:\Program Files\ATI Technologies\ATI.ACE\Core-Static;C:\Program Files\Java\jdk1.6.0_11\bin;C:\Program Files\MySQL\MySQL Server 5.1\bin;C:\JAVA DOCUMENTATION\BasicJava1\Code;C:\Program Files\Mysql Connector J\mysql-connector-java-5.1.7\mysql-connector-java-5.1.7-bin.jar
MY CLASSPATH: C:\Program Files\Mysql Connector J\mysql-connector-java-5.1.7\;C:\Program Files\Mysql Connector J\mysql-connector-java-5.1.7-bin
Before I set the ABOVE Path's I received the "com.mysql.jdbc.Driver" error. After adding the CLASS PATH as above I got the following Error
"com.mysql.jdbc.Driver"
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Exception in thread "main" java.lang.NoClassDefFoundError: connect (wrong name:
Connect)
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at java.lang.ClassLoader.loadClass(Unknown Source)
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at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
Could not find the main class: connect. Program will exit.
THIS IS MY CODE.....
import java.sql.*;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
public class Connect
public static void main (String[] args)
Connection conn = null;
try
String userName = "sampadm";
String password = "secret";
String url = "jdbc:mysql://localhost/sampdb";
Class.forName ("com.mysql.jdbc.Driver").newInstance ();
conn = DriverManager.getConnection (url, userName, password);
System.out.println ("Database connection established");
catch (Exception e)
System.err.println ("Cannot connect to database server");
System.err.println("Exception: " + e.getMessage());
finally
if (conn != null)
try
conn.close ();
System.out.println ("Database connection terminated");
catch (Exception e) { /* ignore close errors */ }
PLEASE PLEASE HELP, AS I NEED TO GET PASSED THIS ERROR NOW. I NEED TO PROGRESS !!
THANKS TO ANYBODY THAT CAN ASSIST
FYI
JUDY

Java is case sensitive. Connect != connect

Error: invalid file 'java/lang/Object.class' (wrong version: 48, expected 4

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