Derby making connection

Question

hello,
I need to have a JDBC connection with derby.
I use this code:
            // define the driver to use             String driver = "org.apache.derby.jdbc.EmbeddedDriver";             // the database name             String dbName="deliverDB";             // define the Derby connection URL to use             DeliverFileManager deliverFileManager = new DeliverFileManager();             boolean oldDB = deliverFileManager.deliverExist("\\" + dbName);             String connectionURL;             if (oldDB == true)                 connectionURL = "jdbc:derby:" + dbName; // + ";create=false";             else                 // jdbc:derby:support/bugsdb;create=true                 connectionURL = "jdbc:derby:" + dbName  + ";create=true";                         try {                 //  Load the Derby driver.                 //  when the embedded Driver is used this action start the Derby engine.  // V.I.                 //  Catch an error and suggest a CLASSPATH problem                 Class.forName(driver);                 System.out.println(driver + " loaded. ");             } catch(java.lang.ClassNotFoundException e)    {                 System.err.print("ClassNotFoundException: ");                 System.err.println(e.getMessage());                 System.out.println("\n    >>> Please check your CLASSPATH variable  <<<\n");             }                         //  Beginning of Primary DB access section ...BOOT DATABASE             try {                 dbconn = DriverManager.getConnection(connectionURL);  // V.I. too                 System.out.println("Connected to database " + dbName);             } catch (SQLException ex) {                 JOptionPane.showMessageDialog(null, ex.getMessage());                             } catch ( Exception excp ) {              // process remaining Exceptions here                 excp.printStackTrace();             }          
the connection fail when the line
Class.forName(driver);
it is executed.
The mistake come for the CLASSPATH, and I tried to set it in the control
panel but am not able to set it good for my purpose...
How it is possible to indicate the CLASSPATH, looking for to the future problem of install the program
in other computers too ?
In this moment the program it is run in the IDE of NetBeans 6.1.
thank you
regards
tonyMrsangelo

Answer 1

ViKARLL wrote:
Hi Tony,
Have you found a solution ? The Following worked for me.
1) Copy and past derby.jar to your <your drive>\Program Files\Java\jdk <your version>\jre\lib\ext folder.
For me it was on Widows XP;
C:\Program Files\Java\jdk1.6.0_06\jre\lib\ext\derby.jar;2) Set the CLASSPATH in your environmental Variable as you did earlier, but this time point to the above location.
Hope this helps.
ViKARLLWrong approach. Don't do that. If you upgrade JDK after one month, your applications won't work anymore.
Just specify the path to the JAR file in the -classpath (or -cp) parameter of java.exe. To shorten the command you have to enter everytime, write a .bat file with the complete command (or a .sh file in case of *NIX).