Six and a half ridiculous things to do with Quarkus

by Holly Cummins

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6 ½ ridiculous things to do with Quarkus Holly Cummins IBM

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quarkus is used in production by:

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quarkus is used in production by: • telcos

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quarkus is used in production by: • telcos • retailers

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quarkus is used in production by: • telcos • retailers • banks

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quarkus is used in production by: • telcos • retailers • banks BORING!

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how quick can quarkus go? 1

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how quick can quarkus go? 1

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thanks to markus eisele for the graphics code https://github.com/holly-cummins/meme-generator

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was this an easy demo?

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was this an easy demo?

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was this an easy demo? -writing the cli was easy -native compilation was easy -native compilation + awt + mac is very hard

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tell your boss you learned … •picocli + quarkus is cool •native is clever tech •…but native has dragons •only go native if you actually need it

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is quarkus fast? (again) 2

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is quarkus efficient? 2

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it’s also about energy

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it’s also about hardware

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… hardware and energy are money

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… hardware and energy are money BORING!

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9000 potatoes

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0.0007 W

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t3.nano (minimum quarkus requirement) t3.small 2x t3.small (minimum spring boot requirement) Watts per hour 12.5 14 28

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t3.nano t3.small 2x t3.small Watts per hour 12.5 14 28 Lemons per hour 17,857 20,000 40,000

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spring boot 40,000 lemons/hour quarkus 17,857 lemons/hour

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https://github.com/quarkusio/spring-quarkus-perf-comparison

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here’s what we see in our controlled lab https://github.com/quarkusio/benchmarks

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here’s what we see in our controlled lab https://github.com/quarkusio/benchmarks

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here’s what we see in our controlled lab https://github.com/quarkusio/benchmarks

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here’s what we see in our controlled lab https://github.com/quarkusio/benchmarks

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tell your boss you learned … -quarkus uses 2 - 3x fewer compute resources than spring -quarkus is 2 - 3x cheaper to run than spring

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was this an easy demo?

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was this an easy demo?

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was this an easy demo? -bringing 77,857 lemons to amsterdam was too hard

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was this an easy demo? -bringing 77,857 lemons to amsterdam was too hard -our industry is still learning how to do energy measurement

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don’t do perf testing on a laptop don’t drive load from the machine being measured

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https://github.com/holly-cummins/gen-alpha-iser

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was this an easy demo?

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was this an easy demo? super easy

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tell your boss you learned … @ServerResponseFilter

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1 4

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https://github.com/phillip-kruger/quarkus-jokes

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was this an easy demo?

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was this an easy demo? yes, phillip krüger wrote all of it :)

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tell your boss you learned … the dev ui now has assistants to help you write + debug code

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https://github.com/quarkiverse/quarkus-bon-jova-rockstar

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https://github.com/quarkiverse/quarkus-bon-jova-rockstar

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was this an easy demo?

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was this an easy demo?

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was this an easy demo? -friends don’t let friends write compilers

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was this an easy demo? -friends don’t let friends write compilers -bytecode generation :(

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was this an easy demo? -friends don’t let friends write compilers -bytecode generation :( -parsing :( :(

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tell your boss you learned … -the quarkiverse is very welcoming to new extensions -writing a compiler is a bad idea (but if you do go there, use antlr)

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observability 6½

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user code

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user code quarkus framework

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application user code quarkus framework

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application user code quarkus framework extensions

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application user code quarkus framework extensions

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application user code quarkus framework client extensions

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application user code quarkus framework client extensions

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application user code quarkus framework client extensions

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application user code quarkus framework client extensions

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application user code quarkus framework client extensions observability stack

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application user code quarkus framework client metrics extensions observability stack

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application user code quarkus framework client metrics traces extensions observability stack

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application user code quarkus framework client metrics traces logs extensions observability stack

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application user code quarkus framework observability client client metrics traces logs extensions observability stack

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application user code quarkus framework observability client client metrics traces logs extensions observability stack

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application user code quarkus framework observability client client dev service (testcontainers) extensions observability stack

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application user code quarkus framework observability client client dev service (testcontainers) extensions observability stack BORING!

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application user code quarkus framework client extensions

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application user code quarkus framework client extensions

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application user code quarkus framework client extensions minecraft server

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application user code quarkus framework minecraft client client extensions minecraft server

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application user code quarkus framework minecraft client client extensions minecraft server

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application user code quarkus framework minecraft client client extensions minecraft server mod

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application user code quarkus framework minecraft client client dev service (testcontainers) extensions minecraft server mod

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https://github.com/quarkiverse/quarkus-observability-minecraft

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tell your boss you learned … -you can do a lot with interceptors -dev services are awesome

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https://github.com/quarkiverse/quarkus-observability-minecraft

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https://github.com/quarkiverse/quarkus-observability-minecraft

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was this an easy demo?

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was this an easy demo?

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was this an easy demo? -extension was easy, minecraft mod was hard

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was this an easy demo? -extension was easy, minecraft mod was hard -minecraft APIs

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was this an easy demo? -extension was easy, minecraft mod was hard -minecraft APIs -lack documentation

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was this an easy demo? -extension was easy, minecraft mod was hard -minecraft APIs -lack documentation -change between minor versions

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was this an easy demo? -extension was easy, minecraft mod was hard -minecraft APIs -lack documentation -change between minor versions -client-server sync of injected behaviour is hard

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tell your boss you learned … - typesafe objects are better than a chat box - … but small models may struggle with structured data - gen ai adds latency

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gen ai: what could possibly go wrong? 4

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https://www.computerworld.com/article/4059383/openai-admits-ai-hallucinations-are-mathematically-inevitable-not-just-engineering-flaws.html rate of hallucination when summarizing public information:

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o1: 16% https://www.computerworld.com/article/4059383/openai-admits-ai-hallucinations-are-mathematically-inevitable-not-just-engineering-flaws.html rate of hallucination when summarizing public information:

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o1: 16% o3: 33% https://www.computerworld.com/article/4059383/openai-admits-ai-hallucinations-are-mathematically-inevitable-not-just-engineering-flaws.html rate of hallucination when summarizing public information:

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o1: 16% o3: 33% o4-mini: 48% https://www.computerworld.com/article/4059383/openai-admits-ai-hallucinations-are-mathematically-inevitable-not-just-engineering-flaws.html rate of hallucination when summarizing public information:

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solution: guardrails

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“LLM-as-a-judge”

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“LLM-as-a-judge” BORING!

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was this an easy demo?

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was this an easy demo?

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was this an easy demo? -adding guardrails is simple

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was this an easy demo? -adding guardrails is simple -but … the demo needed

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was this an easy demo? -adding guardrails is simple -but … the demo needed -a prompt the llm would hallucinate about 50% of the time

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was this an easy demo? -adding guardrails is simple -but … the demo needed -a prompt the llm would hallucinate about 50% of the time -a reliable guardrail

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disclaimer: just based on anecdotal experience of local models

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tell your boss you learned … -guardrails are important - llm-as-a-judge is still an llm -manage context wisely - context cruft lowers response quality - context growth can cause problems

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what have we done?

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what have we done? 1. made memes with a cli

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what have we done? 1. made memes with a cli 2. con fi rmed quarkus does a lot with very few resources

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what have we done? 1. made memes with a cli 2. con fi rmed quarkus does a lot with very few resources 3. translated output with a fi lter

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what have we done? 1. made memes with a cli 2. con fi rmed quarkus does a lot with very few resources 3. translated output with a fi lter 4. transformed code with an extension

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what have we done? 1. made memes with a cli 2. con fi rmed quarkus does a lot with very few resources 3. translated output with a fi lter 4. transformed code with an extension 5. compiled rock ballads to bytecode

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https://hollycummins.com/quarkus-ridiculous-things-voxxed-amsterdam/

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bonus: hallucinations

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the value of a second opinion? chatgpt.com

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the value of a second opinion? chatgpt.com the statement we’re validating

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the value of a second opinion? chatgpt.com the statement we’re validating “oh yes, de fi nitely true”

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the value of a second opinion? chatgpt.com the statement we’re validating “oh yes, de fi nitely true” “what answer would you give?”

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the value of a second opinion? chatgpt.com the statement we’re validating “oh yes, de fi nitely true” “what answer would you give?” but if you knew, why did you … ?

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gemma3 - 1 b parameters how many bs in blueberry?

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"Okay, let’s tackle this! As of today, October 1st, 2025, there are approximately **12** “BS”s in the word “blueberry.” It’s a surprisingly common phenomenon! 😊 Do you want to explore why this happens?" gemma3 - 1 b parameters how many bs in blueberry?

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deepseekr1- 1.5 b parameters when did brexit happen?

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Hmm, the user is asking about something related to 20-30-0-3 but brexit, probably typo or20-10- something, correction. User meant brexit or2-1- meaning Brexit. Let me confirm that. User is20- user2 is inquiring about Brexit. UK leaving EU thing. But what time period20 2020-3 might be typo for20- 20 twenty021203. 20-20 or something. Perhaps20-202201. UK left. UK left EU. UK left20 on01 Jan201202022-021201021 I think22. Wait no1. Let me212012 January22202021. So January. Yes2 user might be21 probably20 asking about that. User22. Better2 just confirm. Brexit201 20 answer. Say20 simply22 date2. Not much else0 else0. Keep2 simple1 short1 friendly2. Okay2 polite2 user. It seems you're asking about the date the Brexit, right? The UK left EU on 29th January21st of February2020221 deepseekr1- 1.5 b parameters when did brexit happen?