private static CustomHessianSerializer getCustomSerializer(Object obj) {
        if (obj == null) {
            return null;
        }
        return CustomHessianSerializerManager.getSerializer(obj.getClass());
    }
Gets serializer factory.

@param multipleClassLoader the multiple class loader
@param generic             the generic
@return the serializer factory
codec/codec-sofa-hessian/src/main/java/com/alipay/sofa/rpc/codec/sofahessian/SofaHessianSerializer.java