#fixed code
                             private void handlePostValidate(UIInput component) {
		BeanValidator beanValidator = getBeanValidator(component);

		if (beanValidator != null) {
			String originalValidationGroups = (String) component.getAttributes().remove(ATTRIBUTE_ORIGINAL_VALIDATION_GROUPS);
			beanValidator.setValidationGroups(originalValidationGroups);
		}
	}
#vulnerable code 
                             private void handlePostValidate(UIInput component) {
		final BeanValidator beanValidator = getBeanValidator(component);
		final String originalValidationGroups = (String) component.getAttributes().remove(ATTRIBUTE_ORIGINAL_VALIDATION_GROUPS);
		beanValidator.setValidationGroups(originalValidationGroups);
	} 
                            #location 4 
                            #vulnerability type NULL_DEREFERENCE