Coding Quest JavaBin Stavanger Johannes Brodwall Exilesoft Chief

This talk is for you if you…

You work in a team, but...

Your team doesn ’ t feel like a team

Stand-up Designer Frontend dev Database dev No impediments Johannes Backend dev Scrum master

Behold – the uber coder

Exception! org.hibernate.PropertyValueException: not-null property references a null or transient value:....common.entities.Application._applicationsBackref org.hibernate.engine.Nullability.checkNullability(Nullability.java:95) org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:313) org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:204) org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:130) org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEvent Listener.java:210) org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:56) org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:195) org.hibernate.event.def.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:50) org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:93)

ExceptionGoogle Stack overflow TweakDeployPoke

ExceptionGoogle Stack overflow TweakDeployPoke

ExceptionGoogle Stack overflow TweakDeployPoke

ExceptionGoogle Stack overflow TweakDeployPoke

Stand-up Designer Frontend dev Database dev Yesterday, I worked on Create Project Johannes Backend dev Scrum master

Stand-up Today, I will hopefully fix the exception and also do Delete Project Johannes Scrum master Designer Frontend dev Database dev Backend dev

Stand-up No impediments Johannes Scrum master Designer Frontend dev Database dev Backend dev

Stand-up Johannes Scrum master Designer Frontend dev Database dev Backend dev How could they help anway

Behold – the uber coder

Stand-up Johannes Scrum master Yesterday, I finally finished Delete after 3 days of «coding» Designer Frontend dev Database dev Backend dev I didn’t need the Delete service

Stand-up Johannes Scrum master Designer Frontend dev Database dev Backend dev I didn’t need the Delete service Yesterday, I finally finished Delete after 3 days of «coding»

STOP

Imagine you should carry 10 wooden beams Each is 3 meters and 30 kg

The fun team

Stand-up I’m ready for a new task. What’s on the board.. Johannes Scrum master

Stand-up «Let’s users administrate their projects» Johannes Scrum master

Stand-up I haven’t done any Hibernate tasks before. Who can I pair with? Johannes Scrum master I can work together with you

Exception! org.hibernate.PropertyValueException: not-null property references a null or transient value:....common.entities.Application._applicationsBackref org.hibernate.engine.Nullability.checkNullability(Nullability.java:95) org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:313) org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:204) org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:130) org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEvent Listener.java:210) org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:56) org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:195) org.hibernate.event.def.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:50) org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:93)

That link doesn’t really seem relevant. Are we getting anywhere? Time to ask for help?

I think Dileepa has worked on this sort of thing before

Dileepa Yeah, just look at the Person HasMany Roles mapping

That’s it! High five!

Pair programming styles

Debate club “No, this variable should be called fooNumber, not fooNum”, “But it’s a common abbreviation”

Dedicated driver “I’ll write the parser” “I’ll design the algorithm”

Driver-navigator “I don’t know how to solve this, so I’ll sit at the keyboard”

Ping-pong

Ingredient #1: Pair programming

Ingredient #2: Test driven development

Failing test Write code Failing test Write code Failing test

Ingredient #3: Refactoring

Failing test Write code Failing test Write code Failing test Refactor code and tests

Put together

Failing test Write code Failing test Write code Failing test

Write code Failing test Write code Failing test Refactor code and tests

Failing test Write code Failing test Write code Failing test Refactor code and tests

Kata: Number to roman

1 => I 2 => II 4 => IV 5 => V 10 => X 50 => L 100 => C 500 => D 1000 => M 1999 => MCMXCIX

Make sharing into a goal

Dileepa Johannes Chintaka Thomas Sergey Arunas

Dileepa Johannes Chintaka Thomas Sergey Arunas

ArunasJohannesDileepaChinthakaSergeyThomas Add new company ✓✓✓✓✓ Display contacts on map ✓✓✓ Filter contacts in list ✓✓ Authenticate user by company ✓✓✓✓ Store password securely ✓✓ Usernames with Norwegian letters are rejected ✓

ArunasJohannesDileepaChinthakaSergeyThomas Add new company ✓✓✓✓✓ Display contacts on map ✓✓✓ Filter contacts in list ✓✓ Authenticate user by company ✓✓✓✓ Store password securely ✓✓ Usernames with Norwegian letters are rejected ✓

ArunasJohannesDileepaChinthakaSergeyThomas Add new company ✓✓✓✓✓ Display contacts on map ✓✓✓ Filter contacts in list ✓✓ Authenticate user by company ✓✓✓✓ Store password securely ✓✓ Usernames with Norwegian letters are rejected ✓

Building your skills

Expect exhaustion

Just do it

Conclusion

Less Overproduction (unused functions in API) Less Waiting (for the only person who knows X) Less Motion (as everyone gets more skilled) Fewer Defects (as two pair of eyes see better) Less Over-processing (from double responsibility) Less Inventory (as team works more focused) Less Transportation (handoffs inside a story)

How

Ask for help – don’t work alone Try ping pong programming for two hours Be open, share and listen

You can start as soon as you get back to work

Thank you