JDBC help needed ; java.lang.NoClassDefFoundError:test1

Question

hi, everyone, i had a problem when i run my own app to connect javadb in embedded mode
i ve added the ~/javadb/lib/derby.jar to CLASSPATH
and ~/javadb/lib/derby.jar:~/javadb/lib/derbytools.jar to DERBY_HOME
but there is a problem said my own application class cannot be found.
here is my code:
import java.sql.*;
class test1
  public static void main (String args [])
       throws SQLException
       try {
        Class.forName("org.apache.derby.jdbc.EmbeddedDriver");
    } catch (Exception e) {
        System.out.println("ERROR: failed to load javadb JDBC driver.");
        e.printStackTrace();
        return;
      Connection conn = DriverManager.getConnection("jdbc:derby:testdb");
  try{
     Statement stmt1 = conn.createStatement();
        ResultSet rset1 = stmt1.executeQuery( "SELECT * FROM PART" );
     long counter1 = 0;
        double price1;
     while ( rset1.next() )
         price1 = rset1.getDouble(8);
         if (price1 == 1306.4)
          counter1++;
     System.out.println( counter1 );
     stmt1.executeQuery("SHUTDOWN");
     conn.close();
   catch (SQLException e )
     String errmsg = e.getMessage();
     System.out.println( errmsg );
}and i ve followed one Derby JDBC tutorial on the internet,
* AutoLoadJdbcDriver.java
* Copyright (c) 2007 by Dr. Herong Yang. All rights reserved.
import java.sql.*;
import java.util.*;
public class AutoLoadJdbcDriver {
  public static void main(String [] args) {
    Connection con = null;
    try {
      listDrivers();
// Find the driver for a given URL
      Driver driverClass = (Driver) DriverManager.getDriver(
        "jdbc:derby://somehost/somedb");
      System.out.println("\nDriver for jdbc:derby://somehost/somedb");
      System.out.println("   "+driverClass.getClass().getName());
      listDrivers();
    } catch (Exception e) {
      System.err.println("Exception: "+e.getMessage());
  private static void listDrivers() {
    Enumeration driverList = DriverManager.getDrivers();
    System.out.println("\nList of drivers:");
    while (driverList.hasMoreElements()) {
      Driver driverClass = (Driver) driverList.nextElement();
      System.out.println("   "+driverClass.getClass().getName());
The output below confirms that the DriverManager class is able to load any JDBC driver classes as long as their JAR files are included in the classpath.
C:\>javac AutoLoadJdbcDriver.java
C:\>java -cp .;\local\javadb\lib\derbyclient.jar AutoLoadJdbcDriver
List of drivers:
sun.jdbc.odbc.JdbcOdbcDriver
org.apache.derby.jdbc.ClientDriver
Driver for jdbc:derby://somehost/somedb
org.apache.derby.jdbc.ClientDriver
List of drivers:
sun.jdbc.odbc.JdbcOdbcDriver
org.apache.derby.jdbc.ClientDriver
but on my machine , it keep telling me the massage
Exception in thread "main" java.lang.NoClassDefFoundError: SimpleApp
Exception in thread "main" java.lang.NoClassDefFoundError: test1
Exception in thread "main" java.lang.NoClassDefFoundError: AutoLoadJdbcDriver
the ij works well
and the other java app(without jdbc) works well.
anybody can help me to solve this problem?
Edited by: Xiao on Jan 18, 2008 6:19 PM

Answer 1

but on my machine , it keep telling me the massage
Exception in thread "main" java.lang.NoClassDefFoundError: SimpleApp
Exception in thread "main" java.lang.NoClassDefFoundError: test1
Exception in thread "main" java.lang.NoClassDefFoundError: AutoLoadJdbcDriverI assume you get these messages when you try and run the three programs mentioned (SimpleApp, test1 and AutoLoadJdbcDriver).
What commands do you use to do this? What does the command line report the CLASSPATH to be (using the echo command)?
The simplest cause would be that you have the derby jar mentioned as part of CLASSPATH, but not the current directory.