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Javapoet. This helped me a lot, because i wrote two generators, one for one employer, who don't like dynamic generators, so the first was to generate mappers like mapstruct does; from model to pojos and viceversa. The second one was a static testing pojo factory generator; this last one i made public (it's pretty basic and now we have projects like instancio and podam) its name is mother-factory.
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Stream
Stream - Scalable APIs for Chat, Feeds, Moderation, & Video. Stream helps developers build engaging apps that scale to millions with performant and flexible Chat, Feeds, Moderation, and Video APIs and SDKs powered by a global edge network and enterprise-grade infrastructure.
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picocli
Picocli is a modern framework for building powerful, user-friendly, GraalVM-enabled command line apps with ease. It supports colors, autocompletion, subcommands, and more. In 1 source file so apps can include as source & avoid adding a dependency. Written in Java, usable from Groovy, Kotlin, Scala, etc.
Picocli is a pretty good one for writing CLI apps
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Record builder is pretty good for making builders for your Java 17 records
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I like to use AutoService to make using Java's ServiceLoader easier.
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error-prone is good for some extra static analysis.
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JavaCPP and presets for working with JNI
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InfluxDB
InfluxDB – Built for High-Performance Time Series Workloads. InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.
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JavaCPP and presets for working with JNI
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afterburner.fx
The Opinionated Un-Framework For Java FX Applications (by dlsc-software-consulting-gmbh)
Afterburner.fx for FXML loading and dependency injection in JavaFX
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AtlantaFX & CSSFX for styling in JavaFX
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AtlantaFX & CSSFX for styling in JavaFX
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Disruptor for inter-thread messaging
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JMH for benchmarks
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Jackson. Because JSON.
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JOOQ. I love this one; its very very useful when you don't need/like any ORM, and it works with, for example Spring JDBC, so you don't have to write directly the SQL into Strings. The generator helps you with all the DAO layer, and if you want it generates JPA Models too.
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Recently been using JIMFS. Made my tests much faster and cleaner!
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Instancio for generating test data AssertJ Awaitility Quarkus FluentJdbc: a thin wrapper around jdbc, you can use it as an alternative for JPA and I use it in Quarkus
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Aeron for low latency apps and Agrona is you're using Aeron for data structures
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Methanol - Lightweight HTTP extensions for Java: https://github.com/mizosoft/methanol
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives