MapStruct

An annotation processor for generating type-safe bean mappers (by mapstruct)

MapStruct Alternatives

Similar projects and alternatives to MapStruct

NOTE: The number of mentions on this list indicates mentions on common posts plus user suggested alternatives. Hence, a higher number means a better MapStruct alternative or higher similarity.

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MapStruct reviews and mentions

Posts with mentions or reviews of MapStruct. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2024-06-09.
  • A single ChatGPT mistake cost us $10k
    8 projects | news.ycombinator.com | 9 Jun 2024
    > You don't need to make DTOs when you don't have to, using AutoMapper is considered a bad practice and is heavily discouraged (if you do have to use a tool like that, there are alternatives like Mapperly which are zero-cost to use and will give you built-time information on what doesn't map without having to run the application).

    The thing is, that you'll probably have entities mapped against the database schema with data that must only conditionally be shown to the users. For example, when an admin user requests OrderDetails then you'll most likely want to show all of the fields, but when an external user makes that request, you'll only want to show some of the fields (and not leak that those fields even exist).

    DTOs have always felt like the right way to do that, however this also means that for every distinct type of user you might have more than one object per DB table. Furthermore, if you generate the EF entity mappings from the schema (say, if you handle migrations with a separate tool that has SQL scripts in it), then you won't make separate entities for the same table either. Ergo, it must be handled downstream somewhere.

    Plus, sometimes you can't return the EF entities for serialization into JSON anyways, since you'd need to introduce some additional parsing logic, to get them into a shape that the front end wants (e.g. if you have a status field or something, the current value of which is calculated based on 5-10 database fields or other stuff).

    Not to say that some of those can't be worked around, but I can't easily handwave those use cases away either. In Java, MapStruct works and does so pretty well: https://mapstruct.org/ I'd rather do something like that, than ask ChatGPT to transpose stuff from DDL or whatever, or waste time manually doing that.

  • Which tricks do you use to write less code?
    2 projects | news.ycombinator.com | 10 May 2024
    I found some "tricks" to write less code, hence less code to maintain if there are any changes. Also less code with bugs just by changing the inputs.

    For example, OpenAPI spec file + OpenAPI generator (https://github.com/OpenAPITools/openapi-generator). Any changes in the OpenAPI spec are reflected in the final code with a build step.

    Another example: MapStruct (https://mapstruct.org/) to avoid passing data from Entity classes to DTO and back. Saves looots of boilerplate code.

    Which are your tricks?

  • Is .NET just miles ahead or am I delusional?
    4 projects | news.ycombinator.com | 13 Apr 2024
    Currently using .NET and ASP.NET for the API of a project that I'm working on, overall it's a pretty lovely experience, especially with the JetBrains Rider as my IDE. Having worked with Java in the enterprise in the past, it feels like a more focused and sometimes more coherent experience (vs the more decentralized nature of Java), that now thankfully runs fine on Linux as well, don't even need to hope that Mono is good enough anymore.

    Entity Framework Core is great, the way how they fetch related data is straightforwards: https://learn.microsoft.com/en-us/ef/core/querying/related-d...

    I also really like the ability to use split queries, when needed: https://learn.microsoft.com/en-us/ef/core/querying/single-sp...

    You can even scaffold your entity mappings from an existing database and manage database migrations separately (which I feel is a must unless you want to pour hours upon hours into learning yet another JPA-like), it's nice when something like that exists in a given ecosystem: https://blog.jetbrains.com/dotnet/2022/01/31/entity-framewor...

    Some of the stuff in the ecosystem is also really nice, like using ActionBlocks from Dataflow for simple queues and task scheduling is very easy to get started with and pretty pleasant: https://learn.microsoft.com/en-us/dotnet/api/system.threadin...

    Honestly, most of the docs that I've come across are rather pleasant and there's plenty of code examples to be had and even LLMs have enough codebases out there to be trained on and give decent output, in addition to the regular autocomplete in the IDE.

    Even some third party stuff like CsvHelper is really well put together: https://joshclose.github.io/CsvHelper/getting-started/#insta...

    That said, I've had issues where trying to deserialize incoming JSON requests ([FromBody]) lead to the whole object being null, due to it not matching the fields 1:1 or violating some nullability constraint, however that happened without a clear error message or as much as a warning in the logs, which felt insane and wasn't very discoverable. Now I just use JObject as the parameter and deserialize at the top of the controller method.

    I've also run into some ecosystem issues where the OpenAPI codegen was a bit lacking and wouldn't actually generate code that works, but maybe that's because the spec was bad: https://openapi-generator.tech/docs/generators/csharp

    I could also not get AutoMapper (https://docs.automapper.org/en/stable/index.html) working satisfactorily, so for now I'm stuck writing mappers by hand with said autocomplete sometimes doing it for me. There were issues with the runtime being unable to register the mappers or something like that, it was a while ago. Overall it felt like the MapStruct library in Java did everything better: https://mapstruct.org/

    On the other hand, I haven't had any of the Spring Boot DI related headaches (needing @Lazy sometimes) with ASP.NET, things there seem way more straightforwards and you clearly define whether something should be a Singleton or Scoped and the rest... just gets out of your way and works.

    Sadly, there have been very hard to track down cases where I try to do a _dbContext.Add(someEntity) and then when I do a save with just the fields in that one entity changed, the performance absolutely seems to slow down to a crawl. Adding _dbContext.ChangeTracker.AutoDetectChangesEnabled = false seemed to help, but I am still not entirely sure what lead to that behavior, the temp directory on my Linux box also started filling up very rapidly, yet the logs had nothing of use, definitely seems like something I'd need to investigate properly.

    Overall, .NET and its ecosystem is pretty good in most cases. And .NET being used in gamedev is also cool, for those who care about that sort of thing, I wonder why jMonkeyEngine never really took off.

  • Object mapping libraries
    1 project | /r/Python | 18 Sep 2023
    In Java (woof..) we have MapStruct (https://mapstruct.org/). Anything like that in Python? I think maybe the Sqlalchemy mapping in Litestar2 is the closest I've seen.
  • Feedback on a new annotation processor api
    9 projects | /r/java | 20 May 2023
    Done right i can look something like mapstruct for example. But like any other feature you need to get a feeling for when it's a good idea to use it.
  • Mapping in Domain Driven Design sucks
    1 project | /r/javahelp | 6 Feb 2023
    We are using mapstruct but it sucks when you have protobuf :/
  • must known frameworks/libs/tech, every senior java developer must know(?)
    6 projects | /r/java | 9 Dec 2022
    You all beat me to MapStruct and Testcontainers. Honorable mention to RxJava, which I use in Desktop apps.
  • Correct way of exception handling, an optional?
    1 project | /r/javahelp | 30 Nov 2022
    For the mapping, I'm using Mapstruct, I got the instance example from their examples they use INSTANCE as constant.
  • Ask HN: What are your “scratch own itch” projects?
    34 projects | news.ycombinator.com | 13 Nov 2022
  • What next Springboot?
    1 project | /r/javahelp | 1 Oct 2022
    Now update your code so that no entities are passed to/from the domain layer and that no objects are passed to/from the domain layer. You'll look at me as though I'm nuts, but you will thank me later. Look at things like http://immutables.github.io/ and https://mapstruct.org/
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