CloseableIterator<GATKFeature> dbsnpIterator = null;
VariantOverlapAnnotator variantOverlapAnnotator = null;
public void initialize() {
vcfwriter = VariantContextWriterFactory.sortOnTheFly(baseWriter, 40, false);
variantOverlapAnnotator = new VariantOverlapAnnotator(dbsnp.dbsnp, getToolkit().getGenomeLocParser());
}