Java

General

Java versions
Recommended version -> aligned with production. LTS?
- https://www.oracle.com/java/technologies/java-se-support-roadmap.html
Vendor(s)
- openjdk [Has to be supported by alpine, can change in the future]

Code style

Formatting
Following the Google Java Style Guide
Any deviations??
(Anti-)patterns
TODO (requires reference & motivation) [Guideline]
- Exception handling
  - In relation to closeable objects
- Use of interfaces
- Re-assigning variables (i.e. not final)
- Mutable collections
- Home brewing common but error prone algorithms
  - instead use library, typically guava
  - examples: parsing (csv), string manipulations, IO pipelines, ...
- ...
Design considerations for applications and services
OOP principles

Frameworks & libraries

Guideline: for each of the categories in the table below, investigate the applicability of the library listed in the respective ‘guideline’ column before considering alternatives or implementing your own utilities.

Category	Guideline	Remarks
General utility: Collections, Strings, IO, ..	Guava and/or Apache Commons
Logging facade	SLF4J
Log binding	logback	Log4j acceptable but considered legacy; migration to logback recommended
CLI options	Apache Commons CLI
Dependency injection	Spring IoC	Use general Java annotation (e.g. @javax.inject.Inject)
Web application (server side)	Apache Wicket Spring (WebMVC, thymeleaf)
Web service	Dropwizard Spring (WebMVC / WebFlux)
Testing	JUnit
Mocking	Mockito
XML testing	XMLUnit

Documentation

Javadoc
[Which guideline?]
Publication
What to put in README
Java version
Build instructions

Build tools & Continuous Integration

Maven
Project structure
Versioning
Deploying to repository
- [Where to publish]
Gradle
Don’t use it [Guideline]
Ant
Definitely don’t use it [Guideline] -

Static code analysis

Maven plugins
Code coverage
Static code analysis