MapStruct
Lombok
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MapStruct | Lombok | |
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24 | 94 | |
6,797 | 12,597 | |
1.5% | 0.8% | |
7.8 | 8.9 | |
28 days ago | 26 days ago | |
Java | Java | |
Apache License 2.0 | GNU General Public License v3.0 or later |
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
MapStruct
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Is .NET just miles ahead or am I delusional?
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.
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Object mapping libraries
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.
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Feedback on a new annotation processor api
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.
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Mapping in Domain Driven Design sucks
We are using mapstruct but it sucks when you have protobuf :/
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must known frameworks/libs/tech, every senior java developer must know(?)
You all beat me to MapStruct and Testcontainers. Honorable mention to RxJava, which I use in Desktop apps.
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Correct way of exception handling, an optional?
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?
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What next Springboot?
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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Using MapStruct and Lombok with Inheritance
When my pairing partner and I ran into this use case, we were initially stumped. Even our combined Google Fu efforts were not turning up a good solution. However, we eventually discovered a PR for MapStruct that seemed to be the solution to our issues! But, of course, if it were that simple, I would not be writing this now. The SubClassMapping annotation provided by that PR, while quite helpful, requires specific Mapping annotations for every field on the subclass. We wanted a more elegant solution.
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We released a new version of ShapeShift (0.6.0) - A lightweight, modular, performant and extensible object mapping library
Just use MapStruct...
Lombok
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Consuming and Testing third party API's using Spring Webclient
The above class maps the json data to a java object we can work with. We use Lombok to generate constructors, getters and setters for our code and the Jackson Project to handle serialization and deserialization of json to pojo . We know the response is an array of objects representing the coffee and so above data structure is fit for this.
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💻 7 Open-Source DevTools That Save Time You Didn't Know to Exist ⌛🚀
Almost a decade ago, I started reducing my boilerplate (and saving time with Lombok. It made my life much easier, simple as that. Ever since I've been looking into finding the smoothest solutions for saving time rather than handling all of it myself.
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How to prevent NullPointerExceptions in Java
Lombok is a widely used library that simplifies Java code. The @NonNull annotation helps enforce non-null parameters, generating appropriate null checks:
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How to implement GZIP decompression for incoming HTTP requests on the Netty server
Project Lombok
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Feedback on a new annotation processor api
I gotta agree with /u/rzwitserloot I don't see anything in the lombok repo that indicates they have their "own compiler". I see the "reaching into javac internals" but that's it.
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Does any tooling exist for Java to add @NotNull to every parameter, return type, field, etc. by default?
i looked into that and found this: https://github.com/projectlombok/lombok/issues/2310
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Would this OpenJDK proposal make Java easier to learn?
Funny enough; /u/rzwitserloot is the author of Lombok, one of the most widely used Java libraries in the world. So it's not really some kind of random-ass Redditor they're having a discussion with either.
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Kotlin : A Java developer's perspective
This removes the need to add the 'Project Lombok' library (and going through a phase of installing it in your Eclipse IDE; old school devs know what I am talking about) and speeds up development time. Java 14 added a new feature of 'Records' which allows you to do the same, but it doesn't offer a 'copy' method to ease your object creation and also enforces the 'final' keyword for variables making them immutable.
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X-Pipe - A connection manager and remote file explorer. Let me know what you think!
I get the main criticisms of Java, i.e. its verbosity and the requirement for a lot of boilerplate code, and understand why some people switched to Kotlin. But by using libraries such as lombok you can get rid of most of it and suddenly the incentives for switching aren't that big anymore. And in the end it's all JVM bytecode anyways.
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How often do you do/use this in your job?
I usually use this... https://projectlombok.org/
What are some alternatives?
ModelMapper - Intelligent object mapping
JHipster - JHipster, much like Spring initializr, is a generator to create a boilerplate backend application, but also with an integrated front end implementation in React, Vue or Angular. In their own words, it "Is a development platform to quickly generate, develop, & deploy modern web applications & microservice architectures."
JMapper Framework - Elegance, high performance and robustness all in one java bean mapper
Immutables - Annotation processor to create immutable objects and builders. Feels like Guava's immutable collections but for regular value objects. JSON, Jackson, Gson, JAX-RS integrations included
Orika - Simpler, better and faster Java bean mapping framework
manifold - Manifold is a Java compiler plugin, its features include Metaprogramming, Properties, Extension Methods, Operator Overloading, Templates, a Preprocessor, and more.
Dozer - Dozer is a Java Bean to Java Bean mapper that recursively copies data from one object to another.
Auto - A collection of source code generators for Java.
Selma - Selma Java bean mapping that compiles
record-builder - Record builder generator for Java records
AspectJ