H2
Lombok
Our great sponsors
H2 | Lombok | |
---|---|---|
11 | 94 | |
4,048 | 12,597 | |
1.3% | 0.8% | |
9.1 | 8.9 | |
6 days ago | 23 days ago | |
Java | Java | |
GNU General Public License v3.0 or later | 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.
H2
-
H2 Database – CVE getting flagged by automated scans
The URL should point to a particular comment, but HN removes fragments: https://github.com/h2database/h2database/issues/3686#issueco...
-
“Our paying customers need X, when will you fix it?”
This sounds very much like the idiocy of "infosec" lunkheads who know nothing about what they're "fixing" but if an automated system tells them a CVE exists, they've absolutely got to have it "patched". They don't look into what the claims of the CVE are, or whether their specific use case is vulnerable. They don't know, they don't care, they're not even programmers. All they know is a box needs ticking.
A similar thing happened with h2database - a "security researcher" found that if you do something you're told not to do, then bad things happen.. but they demanded and got a CVE allocated anyway. Anyone who looks at it realises it's bullshit, but the mere existence of a CVE is all that matters to these idiots.
What the h2database developer said about it: https://github.com/h2database/h2database/issues/3686#issueco...
> I struggle to understand why I should feel the slightest shred of sympathy for "major corporations" that are using a volunteer-developed open-source project. Feel free to get your corporation to pay someone to deal with this, or pay for a similar commercial library.
-
SQLite Internals: How the Most Used Database Works
> ...than it would be to learn the exact syntax and quirks and possibly bugs of someone else's implementation...
Yup. Also, having deep knowledge of the language is required.
SQLite's grammar is neat. Creating a compatible parser would make a fun project. Here's a pretty good example: https://github.com/bkiers/sqlite-parser (Actual ANTLR 4 grammar: https://github.com/bkiers/sqlite-parser/blob/master/src/main... )
Postgres, which tries to be compliant with the latest standards, however...
SQL-2016 is a beast. Not to mention all the dialects.
I'm updating my personal (soon to be FOSS) grammar from ANTLR 3 LL(k) to ANTLR 4 ALL().
I've long had a working knowledge of SQL-92, with some SQL-1999 (eg common table expressions).
But the new structures and extensions are a bit overwhelming.
Fortunately, ANTLR project has ~dozen FOSS grammars to learn from. https://github.com/antlr/grammars-v4/tree/master/sql
They mostly mechanically translate BNFs to LL(k) with some ALL(). Meaning few take advantage of left-recursion. https://github.com/antlr/antlr4/blob/master/doc/left-recursi...
Honestly, I struggled to understand these grammars. Plus, not being conversant with the SQL-2016 was a huge impediment. Just finding a succinct corbis of test cases was a huge hurdle for me.
Fortunately, the H2 Database project is a great resource. https://github.com/h2database/h2database/tree/master/h2/src/...
Now for the exciting conclusion...
My ANTLR grammar which passes all of H2's tests looks nothing like any of the official or product specific BNFs.
Further, I found discrepancy between the product specific BNFs and their implementations.
So a lot of trial & error is required for a "real world" parser. Which would explain why the professional SQL parsing tools charge money.
I still think creating a parser for SQLite is a great project.
-
Database of Databases
H2 - Free, Embedded & Open source
-
🎀 Spring Boot 2.7.0 Released
H2 2.1
-
How is the market for Kotlin developers where you live?
H2 for mocking relational database connections
- Ask HN: Who wants to be hired? (December 2021)
-
Best Database option for a Swing application
It's open-source and written in Java, so you can even create custom procedures and register them straight in your application!
-
Reliable WebSockets-based pub/sub with Spring Boot
Firstly, let's set up a basic Spring Boot application. We can use the Spring Initializr with Spring Data JPA, H2 Database, Lombok added. H2 Database will provide us with a simple database, and Spring Data JPA will allow us to easily interact with it using Hibernate. Lombok will make it easier to write concise and readable classes.
-
Why are tar.xz files 15x smaller when using Python's tar compared to macOS tar?
Sorting chunks by similarity: commonly used tools don't do that. Most archive tools only sort by file type.
I wrote a tool that chunks the data (into variable-sized blocks, to re-sync if there are multiple files that have different length prefixes, but that's another story), and then sorts the chunks by LSH (locality sensitive hash). LSH is used by search engines to detect similar text. It can compress directories that contain multiple version of e.g. source code very well (e.g. trunk, branches). https://github.com/h2database/h2database/blob/master/h2/src/...
I discussed this approach with a researcher in this area in January 2020. AFAIK there is active research in this area, specially to compress DNA sequences. But he also wasn't aware of papers or research in this area for general-purpose data compression.
So, I think this area is largely uncharted. I would be interested (as a hobby side project) to help, if somebody is interested.
Lombok
-
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.
-
💻 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.
-
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:
-
How to implement GZIP decompression for incoming HTTP requests on the Netty server
Project Lombok
-
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.
-
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
-
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.
-
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.
-
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.
-
How often do you do/use this in your job?
I usually use this... https://projectlombok.org/
What are some alternatives?
MapDB - MapDB provides concurrent Maps, Sets and Queues backed by disk storage or off-heap-memory. It is a fast and easy to use embedded Java database engine.
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."
HikariCP - 光 HikariCP・A solid, high-performance, JDBC connection pool at last.
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
MariaDB4j - MariaDB Embedded in Java JAR
manifold - Manifold is a Java compiler plugin, its features include Metaprogramming, Properties, Extension Methods, Operator Overloading, Templates, a Preprocessor, and more.
Flyway - Flyway by Redgate • Database Migrations Made Easy.
Auto - A collection of source code generators for Java.
JetBrains Xodus - Transactional schema-less embedded database used by JetBrains YouTrack and JetBrains Hub.
record-builder - Record builder generator for Java records
Chronicle Map - Replicate your Key Value Store across your network, with consistency, persistance and performance.
AspectJ