Using JAR's

Question

Hi,
i have a large application spread across multiple files. Since the app is to be run from a central server, i would like to put all the class files into 1 jar file. i have managed to create the jar file and it works. however, i get a "cannot find the driver classes" error when i try to access the database.
this is the code that fails:
private String driverName="com.sybase.jdbc2.jdbc.SybDriver";
Connection conn;
Statement stmt;
ResultSet rst;
try{
     Class.forName(driverName);
     //some database stuff
catch(ClassNotFoundException e)
     System.err.println("Cannot find driver classes");
catch(SQLException ex)
     System.err.println("SQL EXception\n" + ex);
its failing at the class.ForName part. how can i fix this? do i need to change the path when using a JAR file? do i need to explicitly set CLASSPATH?

Answer 1

This is not a problem with your Jar file.
It is your command not completed.
There are two ways to do this.
The easy way, find the main running class in your MyJarFile.jar and do this:
java yourPackageName.YourMainRunningClass
(since all the necessary files are in your classpath already)
The long typing way, do this:
java -classpath repeatYourFullClasspathHere -jar MyJarFile.jar
--lichu