Table of Contents

Introduction
Web Frameworks
Authentication Framework
ETL Libraries
Maven Plugins
Relational Data Persistence
Testing Libraries
Utilities Libraries
Supplementary Libraries
Noteworthy Libraries
Reference

Introduction

List of java libraries which I had used over the years. Especially those which are unable to make it to Skill

Web Frameworks

Spring Boot - which I have been a loyal follower since version 1.2.1
VueJS or Angular

Authentication Framework

Spring Security
Apache Shiro - easier to extend for fine grained ACLs
Love to try : OACC - one of the most extensive java security framework I ever come across

ETL Libraries

Maven Plugins

eclipselink-maven-plugin - Eclipselink static weaving and canonical model generation made simple
Git-Flow Maven Plugin - one of the nice tools to use if you want to practise GitFlow in the Jenkins setup

Relational Data Persistence

Spring Data JPA with Hibernate/Eclipselink
Mybatis - in a way it can support multiple databases...
Mybatis-PageHelper - mybatis plugin for pagination

Spring Data JPA and Mybatis can actually coexists together.

Testing Libraries

Junit 5 - my current default choice
Spock Framework - my default choice before JUnit 5
Spring JUnit 5 Testing Support - JUnit Jupiter testing support in conjunction with Spring Framework 4.3.x

Thanks to this library, I can use Junit5 in Spring 4.3.X... https://t.co/q3mXadDvAL
— Ian Lim (@mallim) July 3, 2019

Utilities Libraries

Supplementary Libraries

Convert HTML To PDF using wkhtmltopdf: Java WkHtmlToPdf Wrapper
CORS for those without Spring: CORS Filter - @Cors alternative
Cron expression parser: cron-utils - Cron utils for parsing, validations and human readable descriptions as well as date/time interoperability. http://cron-utils.com
Database source control: Liquibase
DDD, CQRS: AxonFramework allows you to do @Command, CQRS, EventStore
Embedded monitoring: Java Melody - for embedded monitoring
Excel Import/Export via annotations: easy-poi
Fake data generator: java-faker - quite a nice test data generator
Filter Support for Spring MVC & Spring Data JPA: specification-arg-resolver
Generate dynamic Sql based on hibernate session: NativeCriteria
Java Bean Mapping: MapStruct, Orika
Templating: JMustache preferred over Apache Velocity and Handlebars.java
Parser: univocity-parser one of the best java based CSV parser around, if you cannot use an ETL tool. Able to work with CSV, TSV, fixed width columns
XPath equivalent for JSON: JsonPath

Noteworthy Libraries

This means good to know and I never use...

datasource-proxy provide proxy classes for JDBC API to intercept executing queries and methods.
database-rider integrates DBUnit and JUnit in order to make database testing a breeze! Can work with Spring Boot !
Easy Batch can try if really dun want to use Apache Camel or Pentaho Data Integration - Kettle
Eclipse Collections looks interesting to have a dab with it one day
JOOQ - interested to try iff targetted db is kept to open source
XDocReport - DocReport means XML Document reporting. It's Java API to merge XML document created with MS Office (docx) or OpenOffice (odt), LibreOffice (odt) with a Java model to generate report and convert it if you need to another format (PDF, XHTML...).

DTO Mapper in Java

State Machines in Java

Events in Java

Guava EventBus
guava-eventbus-spring
simpleeventbus
MBassador
spring-event old example of using Spring application context to publish events
Myclila Event EventBus system for publish and subscribe to events within an application
spring-events

Annotate a singleton bean method to be notified of the event only when the transaction has been committed

 @Component
 private class InvoiceArchiver {
     @Observes(when = EventMoment.AFTER_COMMIT)
     @Async
     public void archiveInvoice(InvoiceCreated event) {
         ...
     }
 }

Reference