Class<? extends VariantStratifier> c = classMap.get(module);
try {
VariantStratifier vs = c.newInstance();
vs.setVariantEvalWalker(variantEvalWalker);
vs.initialize();
strats.add(vs);
} catch (InstantiationException e) {
throw new GATKException("Unable to instantiate stratification module '" + c.getSimpleName() + "'");
} catch (IllegalAccessException e) {