Bug 211004 Failed to remove temp db directory after running multiple reports
Description: I use Report Engine API to do runAndrender, run and dataextract tasks on multiple reports. Before the Platform started, I change the temp folder(System.setProperty( "java.io.tmpdir", TEMP_HOME )). Each task is closed after it finished and I shutdown the Platform after all the tasks finished. In log I found "Fail to remove one or more file in temp db directory,but it will be removed when the VM exits: D:\BIRT_NG\temp/BIRTSampleDB_1196129572031_10a6ae2". In temp folder the BIRTSampleDB_XXX is still here but not removed. I think it is the issue when remove the Temp sampleDB. Build number: 2.3.0.v20071127-0630
data/org.eclipse.birt.report.data.oda.sampledb/src/org/eclipse/birt/report/data/oda/sampledb/SampleDBJDBCConnectionFactory.java
}
		}
		return derbyDriver;
	}
	
	/**
	 * Class loader to delegate Derby class and resource loading to our loader, and others 
	 * to the default context loader
	 */
	private static class ContextClassLoaderDelegator extends ClassLoader
	{
		private DerbyClassLoader derbyLoader;
		public ContextClassLoaderDelegator( ClassLoader defaultLoader, DerbyClassLoader derbyLoader)
		{
			super(defaultLoader);
			assert derbyLoader != null;
			assert derbyLoader.isGood();
			this.derbyLoader = derbyLoader;
		}
		
		/**
		 * @see java.lang.ClassLoader#loadClass(java.lang.String, boolean)
		 */
		protected synchronized Class loadClass(String name, boolean resolve) throws ClassNotFoundException
		{
			if ( DerbyClassLoader.isDerbyClass(name) )
			{
				
				return derbyLoader.loadClass( name, resolve);
			}