Category Archives: Java/Java EE

JavaOne – Escaping Developers’ Nightmares

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“Escaping Developers’ Nightmares”

Speaker: Rustam Mehmandarov

For more blog posts from JavaOne, see the table of contents

Put together code tools and cs to make developer’s paradise.

90s – waterfall, java in notepad/emacs/vim, visual sourcesafe, cvs, javac at command line, MS Access in a shared network folder for defect tracking

now it is rainbows and unicorns – git, real issues tracking

Tweet from here:

YOU ARE IN A LEGACY CODEBASE

> RUN TESTS
YOU HAVE NO TESTS

> READ SPEC
YOU HAVE NO SPEC

> WRITE FIX
YOU ARE EATEN BY AN ELDER CODE HACK.

Continuous integration/deployment/delivery sold as unicorn or rocketship that will takes to stars.

Code quality

  • Code standard – do you have a coding standard? Do you follow it?
  • Encodign – If coding in langage other than English, do you have encoding standard? Is checking automated?
  • MIME Type – Do you have standard?
  • Code Reviews – Do you do? How know code does what supposed to?

Development Tools

  • Code Versioning – “Git or even SVN”. Do you have a branching and tagging strategy?
  • Complexity, Testing
  • Branching
  • Static code analysis
  • Plugins – ex: Sonar
  • IDEs, checks at comits, integrates with unit testing and sonarqube)
  • build tool – Jenkins, TeamCity, Bamboo, etc and Maven, Gradle, etc
  • Unit, integration, UI, end to end tests

Third party libraries

  • Do you track your third party libraries
  • Do you have known issues/vulnerablities
  • Are they updated? Are they maintained? Are they compatible with each other?
  • Are the licenses appropriate
  • Are they in Apache Attic? Where projects go to die
  • Google OSS Fuzz test

Packaging > Delivery > Deploy

  • Automated deployment?
  • What environments can you deploy to?
  • Are enviornment similar
  • Same process to deploy to each environment
  • Do QA and Prod use separate physical hardware
  • How easy to rebuild from a script
  • Do you have monitoring in all environments

Architecture

  • Do you support continous deploy? Microservices? Load balancing?
  • Code package structure can hurt or help you

Helpful Maven plugins
Assembly, versions, depedency, enforcer surefire, failsafe, sonar, findbugs, pmd

Documentation

  • Wiki
  • Avoid multiple documentation systems

Collaboration

  • Issue tracking
    • Wiki
  • Chat

Blog post on bash ools:
https://mehmandarov.com/cmd-tools-for-developers/

My take: Fun comparison. He even drew a unicorn with rainbow hair and a rainbow tail for the “rainbows and unicorns” slide. A lot of things were covered. And if you know you are supposed to do them, definitely a good review/checklist. There were a few stories. I was hoping for more stories or more on how to sell the need for such tools. [Someone asked about how to sell and he said “you just have to explain it and show the value.” I thought how would be in the talk”]

JavaOne – Disrupting Engineering Education

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“Disprupting Engineering Education; Hello from 42”

Speaker: Tony Hendrick, Oleksandra Fedorova & Giacomo Guiulfo

For more blog posts from JavaOne, see the table of contents

https://www.42.us.org

42 Silicon Valley

  • tuition free coding school
  • no teachers
  • no classes
  • when start – can only communicate by Slack
  • the application process starts with two logic games with no instructions. The first test involves memory. If you pass, you get an email with the next steps
  • Then comes the piscine a 4 week crash course in C with daily peer reviewed exercises. Each weekend get an individual and group project. 10-15 hours a day for 28 days. Then whatever want; most students choose 8-10 hour days
  • Staff doesn’t answer questions. They tell you to ask other students. 250-300 students
  • 3-5 year program. Twenty one levels to go through. Self paced
  • Start with writing a C library then can choose branch working with 4 other people
  • high school diploma required only if under 18
  • Supplement with other resources. ex: coursera
  • Buiding open 24×7 so can work when want. Must be in person for tests, grading, etc. Want to build face to face skils for office
  • Learn many languages
  • Must do coding internship after a year. Can pause account if get offer or contract job (or family suitation)
  • Funded by philanthropist
  • Grading is pass/fail. If a tiny bit wrong, still fail
  • Paris campus opened in 2013 and US campus opened in 2016. Also have satelitte campuses in a few countries

Branch choices

  • unix – to become systems programmer – make unix commands, shell
  • graphics – math heavy, fractals
  • algorithms – rebuild common algorithms from scratch and then projects

Example Projects

  • Reimplment printf
  • C++ crash course (in a crash course a project is due every 2 days for 2 weeks
  • Mock interviews – algorithms on whiteboard

Staff
10 full time staff
600 students
1024 computers
staff create opportunities – ex: book room for club

Learning Techniques

  • Active learning – few instructions so figure it out
  • Learning through explaining to others
  • Ability to adapt, research ability, speed
  • Randomized team vs choose a team depending on project

42 Embassadors
Volunteer – demos, registration desk at this conference, etc

My take: Interesting approach to learning and building a community of learners. This sounds way better than what the coding bootcamps are trying to do.

JavaOne – 10 challenges and eliminate stressful bugs

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“Learn the Concepts between these 10 Java Challenges and Eliminate Stressful Bugs”

Speaker: Barry Evans & Rafael Chinelato Del Nero

For more blog posts from JavaOne, see the table of contents

Generics
Missed this one. I was late while chatting in the hallway. (and dithering about whether to go to this session of a Jigsaw one)

Threads
JVM exits if only daemon threads left. Instance variable not thredsafe. [also don’t know that last thread executes last but didn’t comment on that]

Strings
new String() and trim() create objects. == vs equals
[I fell for this. I missed == vs equals]

hashcode and equals
if hashcode always he same, doesn’t help for hashmap. Then only equals matter. Also tricky implementation for hash code to return 7

Crazy Syntax
Fun random syntax. How to obsfucate code.

Sorting and Comparables
TreeSet uses compareTo, not equals or hashcode

Lambda
default methods don’t count towards single abstract method. Also, interfaces can be private

Streams
iterate() is infinite terminal operation so can’t use with forEach. Also, a good reminder to use Comparator.natural order instead of reimplementing when need.

Method Overloading
Widening then autoboxing then varargs.
int and long can “widen” to float.
wrapper class Double goes to Object before double
[I only got this one right because “does not compile” was not a choice”.]
Interesting explanation of about “taking more effort” to use autoboxing/varargs.

Polymorphism
Virtual method invocation means doesn’t matter what store variable reference in. Overloading vs overriding

nobugsproject.com #Javachallenge

My take: This was fun! Being a cert book author gave me an advantage but some were still tricky and tough! And using The Simpsons as examples was fun. He did show of hands for each option; most people didn’t raise their hand for any of the choices.