MapStruct
jackson-databind
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MapStruct | jackson-databind | |
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24 | 11 | |
6,797 | 3,454 | |
1.5% | 0.7% | |
7.8 | 9.7 | |
25 days ago | 6 days ago | |
Java | Java | |
Apache License 2.0 | Apache License 2.0 |
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...
jackson-databind
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The Bogus CVE Problem
Jackson had this problem a few months back, where someone reported a critical CVE against the project and broke builds all around the planet https://github.com/FasterXML/jackson-databind/issues/3972
Basically the programmer (not the attacker) had to write code where an object contained itself
HashMap map=new HashMap<>();
map.put("recursive",map);
After this, Jackson would indeed stack overflow if you asked it to wrap the object to JSON. Then again, half the build-in Java functions (e.g. getting an object hashcode for the map object) also fail for a recursive structure.
The issue remains open 3 months later, Mitre still thinks it's hella serious, and people have yet again learned to just ignore their CI warning about CVEs
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Now it's PostgreSQL's turn to have a bogus CVE
jackson-databind maintainer responds to a similar occurrence few weeks ago: https://github.com/FasterXML/jackson-databind/issues/3972#is...
- Disputed Jackson-databind CVE Causing Disruption
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Serverless Speed: Rust vs. Go, Java, and Python in AWS Lambda Functions
As to Jackson itself see https://github.com/FasterXML/jackson-databind/issues/1970 for example on startup issues. There are others.
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"Shaping JSON" in Jackson without creating an object
after reading https://github.com/FasterXML/jackson-databind/issues/2239 but setting JsonCreator and adding the JsonFormat didn't work.
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Deserializing /Serializing immutable fields and the fields within the fields which are immutable and not changeable with Jackson
Jackson should support records out of the box https://github.com/FasterXML/jackson-databind/issues/2709
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`int('1' * 4301)` will raise ValueError starting with Python 3.10.7
Its not like this vulnerability is something new. Similar issues have been public knowledge for at least four years and discussed widely. The fact that str to int and int to str conversions are slow for huge ints is hardly news.
- Ômicron preocupa por ter respaldo de um modelo Bayesiano para prever o final do ano
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How to write reflection for C++
In C#, Newtonsoft Json has similar functionality, and in Java — Jackson2 ObjectMapper.
- Método put com problema em campo DATE
What are some alternatives?
ModelMapper - Intelligent object mapping
simdjson - Parsing gigabytes of JSON per second : used by Facebook/Meta Velox, the Node.js runtime, ClickHouse, WatermelonDB, Apache Doris, Milvus, StarRocks
JMapper Framework - Elegance, high performance and robustness all in one java bean mapper
fastjson2 - 🚄 FASTJSON2 is a Java JSON library with excellent performance.
Orika - Simpler, better and faster Java bean mapping framework
Hibernate - Hibernate's core Object/Relational Mapping functionality
Dozer - Dozer is a Java Bean to Java Bean mapper that recursively copies data from one object to another.
record-builder - Record builder generator for Java records
Selma - Selma Java bean mapping that compiles
infobip-spring-data-querydsl - Infobip Spring Data Querydsl provides new functionality that enables the user to leverage the full power of Querydsl API on top of Spring Data repository infrastructure.
boost - My personal boost mirror to be submoduled by my projects