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From Kathey Marsden <kmarsdende...@sbcglobal.net>
Subject Question about using URLClassLoader and Derby
Date Wed, 09 Nov 2005 16:55:58 GMT

My goal is:
I want to use a specific version of Derby which I ship with my app and I
don't  want to interfere with any other derby versions loaded  in the
same JVM or have them interfere with me.   I am creating a new
datasource in a separate URLClassLoader and using that for creating all
my connections.  Are there other things I need to do to meet my goal?  
I have a feeling it all must be more complex than it looks to me right now.


Below is some code showing what I have done in playing with this  so far.

Method to load derby in separate loader and create datasource:
      private static DataSource newDataSource(ClassLoader loader, String
databaseName) throws Exception
        DataSource ds = (DataSource)
        // setDatabaseName with reflection
        Class[] argType = {String.class};
        String[] args = new String[] {databaseName};
        Method sh = ds.getClass().getMethod("setDatabaseName", argType);
        sh.invoke(ds, args);
        return ds;

    // Calling program ....
        URL[] urls =
                  new URL[]{new URL(derbyJarURLString)};
            ClassLoader loader1 =new URLClassLoader(urls);
            DataSource ds = newDataSource(loader1,"mydb;create=true");

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