Category Archives: Java/Java EE

[2018 Oracle Code One] Developer Horror Stories

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Development Horror Stories
Speaker: Roberto Cortez & Oleg Selajev

For more blog posts, see The Oracle Code One table of contents

Stories

  • Broke filter so showed adult videos
  • Deleted inventory and no backups. Had to re-enter all data manually.
  • Units of measure
  • Emails with invalid address so bounced around for hours
  • Deleting a repository instead of a file
  • Used a magic number and it lived on forever..
  • Underpowered servers ad not enough tuning.
  • Off by one error because didn’t account for leap year
  • Recursive SQL statement caused issue with a very large bill of materials [and we all learned sql can be recursive]. Lesson: filter at as low a level as possible. Went from 100+ years to 75 milliseconds
  • Missig where clause so emailed too many people a scary message
  • Running a performance test on wifi is really slow.
  • Decompiling a jar making a change and recompiling it.
  • Running a performance test on prod. Didn’t tell security. Thought being DDoS’d
  • Deleted database. Thought was backed up vs being made permanently unavailable. Only two days of data entry to restore.
  • Exposing port publicly lets anyone delete your data
  • Ran test against prod. Looked like DOS so autoblocked headquarters. Prevented all reservations. Workaround was to use mobile site since run elsewhere.
  • Running CI on a laptop caused it to disappear when person got fired. It reappeared briefly when machine next booted up.
  • Project’s CM system is putting ode on CD and putting it in a file cabinet. Have software, but not OS or hardware to run it on
  • Added RAM instead of pagination
  • Rebooted prod (vs retired prod) by going to wrong building

They said youl could use a fake name or fake company name if you went up. Most everyone used their real name. It was funny because he kept asking if people used their real name. When I went up, I said I worked for an unnamed bank in NYC. The guy after me said he worked for an unnamed trading company in NYC.

I also liked how he “baseined” how many people would raise their hands by asking eveyone n the room t raise their hands hen he commented that 90% was like 100%

My take: I went to this session last year. It’s mostly stories from the audience which is fun and different. Great topic for lunchtime.

[2018 oracle code one] dapps/chaincode/smart contracts hands on lab

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DApps, Chaincode, Smart Contracts: Get Decentralized or we’ll go without you.
Speaker: Axel Bronder (Oracle)

For more blog posts, see The Oracle Code One table of contents

Blockchain

  • distributed database/ledger
  • consensus before write
  • immutable data (once write)
  • uses cryptography
  • distributed apps and business logic
  • smart contracts == chaincode (business apps)
  • dApps – ex: Etherium

Hyperledger Fabric

  •  open source
  • permission blockchain
  • can choose consensus model – don’t have to use mining
  • multiple channels – know channel exist, but can’t read it
  • works with different blockchain (doesn’t have to be Oracle Blockchain)
  • peers generate consensus
  • ledger – world state
  • application – ex: Postman

Lab

My take: They wanted people to pair for the lab. Which is fine. But they wanted you to pair on one computer and share the login to the cloud. My partner doesn’t speak English well so we had communication troubles. That turned out to not be my largest problem. They provided papers for two different cloud environments. For half of the participants, the environment was “slow” and timed out. After a bunch of confusion, it installed the chain but didn’t instantiate. An hour into the lab (really 40 minutes because the beginning was talking), we were told to start over. I got another timeout in the new environment and decided to leave and go to another session instead. I did read the entire lab PDF so I got the gist. (I hope our lab goes better tomorrow!)

Oracle Code One 2018 – live blog index

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First time at Oracle Code One! (second time if you count JavaOne!) This post will be updated over the next 4 days with links to all the posts while we’re here.  We are also tweeting: Scott Selikoff and Jeanne Boyarsky

 

Big differences with the new name

Note: I only went to JavaOne once so I don’t know how much of this was specific to last year

  • Signage
  • No Duke cardboard cutout (but Duke still waddles around for pictures)
  • Sunday community day is gone. But there is now a free Discover pass with access to the keynotes.
  • That’s pretty much it. Great conference.

Monday

Tuesday

Wednesday

Thursday