#vulnerable code 
                             private void handlePreValidate(UIInput component) {
		final BeanValidator beanValidator = getBeanValidator(component);
		final String newValidationGroups = disabled ? NoValidationGroup.class.getName() : validationGroups;
		final String originalValidationGroups = beanValidator.getValidationGroups();

		if (originalValidationGroups != null) {
			component.getAttributes().put(ATTRIBUTE_ORIGINAL_VALIDATION_GROUPS, originalValidationGroups);
		}

		beanValidator.setValidationGroups(newValidationGroups);

		if (LOGGER.isLoggable(Level.FINER)) {
			LOGGER.finer(String.format(LOG_VALIDATION_GROUPS_OVERRIDDEN,
				component.getClientId(), originalValidationGroups, newValidationGroups));
		}
	} 
                            #location 4 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                             private void handlePreValidate(UIInput component) {
		BeanValidator beanValidator = getBeanValidator(component);

		if (beanValidator == null) {
			return;
		}

		String newValidationGroups = disabled ? NoValidationGroup.class.getName() : validationGroups;
		String originalValidationGroups = beanValidator.getValidationGroups();

		if (originalValidationGroups != null) {
			component.getAttributes().put(ATTRIBUTE_ORIGINAL_VALIDATION_GROUPS, originalValidationGroups);
		}

		beanValidator.setValidationGroups(newValidationGroups);

		if (LOGGER.isLoggable(Level.FINER)) {
			LOGGER.finer(String.format(LOG_VALIDATION_GROUPS_OVERRIDDEN,
				component.getClientId(), originalValidationGroups, newValidationGroups));
		}
	}