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
{
		boolean isGood = false;
		public DerbyClassLoader( ) 
		{
			super( new URL[0], DerbyClassLoader.class.getClassLoader() );
			
			
			Bundle derbyBundle = Platform.getBundle( "org.apache.derby.core" );
			if ( derbyBundle == null )
			{
				
				logger.severe( "Failed to find plugin org.apache.derby.core" );
			}