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Java

  • Dropwizard Java web framework
    • Probably better/simpler than Spring Boot
      • At least for APIs
    • Jetty for HTTP
    • Jersey for REST
    • Jackson for JSON
      • Still overly verbose for standard boilerplate getters/setters
    • Hibernate Validator declarative validations of user input
  • Thymeleaf Java HTML templates
    • TAL - template attribute language
      • Just plain HTML with special attributes added
    • Also a new way to write plain HTML, with decoupled (in a separate file) view logic
  • Lombok
    • Annotations to reduce getter/setter boilerplate
    • Has IDE plugins for annotation processing
  • Google Auto
    • AutoValue is an alternative to Lombok
      • Provides more flexibility than Lombok, with fewer annotations, but not nearly as concise
      • Only for value object classes; no setters can be created
      • Implemented via a concrete class subclassed from an abstract class that you write
      • Have to use a builder to instantiate an object
    • AutoFactory creates JSR-330-compatible factories via annotations
    • No IDE plugins for annotation processing
  • Immutables
    • Another Lombok alternative
    • Only for immutable value objects
      • Implemented via a concrete class subclassed from an abstract class that you write
    • Have to use a builder to instantiate an object
    • Has IDE plugins for annotation processing
    • Automatic JSON serialization
    • Repository generation for Mongo
  • AssertJ
    • Newer alternative to Hamcrest
    • Slightly simpler syntax than Hamcrest
    • import static org.assertj.core.api.Java6Assertions.assertThat;
  • Kotlin
    • Data classes create POJO with getters, setters, equals(), hashCode(), toString() and copy() in a single line:
      • data class Customer(val name: String, val email: String, val company: String)
    • Easier-to-user lambdas (with implicit it):
      • val positiveNumbers = list.filter { it > 0 }
    • Easy singletons:
      • object ThisIsASingleton {}
    • Optional semi-colons
    • Improved type signature syntax:
      • var output: String
      • fun main(args: Array<String>) {}
    • Create object Python-style (without the new)
    • String interpolation:
      • println("Hello, $name")
    • Explicit nullable types; protection from NullPointerException
      • val name: String? = null
      • println(name.length()) // Compilation error