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      "text":"JVM Anti-Patterns vs Fixes — Quick Reference","fontSize":26,"fontFamily":2,
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      "text":"Every anti-pattern on the left has a direct drop-in fix on the right. Prioritise top-to-bottom — memory issues cause the most production incidents.",
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    {"type":"text","id":"t1bad","x":200,"y":111,"width":454,"height":30,
      "text":"Hardcoded -Xmx/-Xms in Dockerfile\nBreaks silently when VPA or cluster admin resizes limits",
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    {"type":"text","id":"t1fix","x":670,"y":111,"width":506,"height":30,
      "text":"-XX:+UseContainerSupport -XX:MaxRAMPercentage=75.0\nReads actual cgroup limit at startup, correct on any instance size",
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    {"type":"text","id":"t2bad","x":200,"y":153,"width":454,"height":30,
      "text":"MaxRAMPercentage=90 leaves almost nothing for off-heap\nStarves Metaspace, thread stacks, JIT cache, Netty direct buffers",
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    {"type":"text","id":"t2fix","x":670,"y":153,"width":506,"height":30,
      "text":"MaxRAMPercentage=75 reserves 25% for off-heap regions\nMeasure first with: jcmd PID VM.native_memory summary",
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    {"type":"text","id":"t3bad","x":200,"y":195,"width":454,"height":30,
      "text":"No -XX:MaxMetaspaceSize set\nFramework apps can silently grow Metaspace to 800 MB+",
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    {"type":"text","id":"t3fix","x":670,"y":195,"width":506,"height":30,
      "text":"-XX:MaxMetaspaceSize=256m caps unbounded growth\nIncrease to 512m if ClassNotFoundException at startup",
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    {"type":"text","id":"t4bad","x":200,"y":237,"width":454,"height":36,
      "text":"memory requests == memory limits (no headroom)\nOOMKill at P99 load peak when GC surges beyond limit",
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    {"type":"text","id":"t4fix","x":670,"y":237,"width":506,"height":36,
      "text":"requests = P50 RSS, limits = P99 RSS + 25% headroom\nMeasure with: kubectl top pod --containers",
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    {"type":"text","id":"t5bad","x":200,"y":287,"width":454,"height":30,
      "text":"Default ParallelGCThreads on large node\n64-core node + 2-CPU container = 64 GC threads, 2 CPUs available",
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    {"type":"text","id":"t5fix","x":670,"y":287,"width":506,"height":30,
      "text":"-XX:ParallelGCThreads=N where N equals your CPU request\nMatch GC thread count to what the scheduler will actually give you",
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    {"type":"text","id":"t6bad","x":200,"y":329,"width":454,"height":30,
      "text":"CPU-based HPA with Java workloads\nGC stop-the-world spikes CPU, HPA scales out for the wrong reason",
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    {"type":"text","id":"t6fix","x":670,"y":329,"width":506,"height":30,
      "text":"Scale on RPS (requests/second) via KEDA or Prometheus Adapter\nRPS is GC-immune and reflects actual application load",
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    {"type":"text","id":"t7bad","x":200,"y":371,"width":454,"height":30,
      "text":"minReplicas: 1 in HPA\nSingle pod GC pause means 100% request error rate",
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    {"type":"text","id":"t7fix","x":670,"y":371,"width":506,"height":30,
      "text":"minReplicas: 2 so load balancer routes around the pausing pod\nCheapest reliability improvement available to you",
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    {"type":"text","id":"t8bad","x":200,"y":413,"width":454,"height":32,
      "text":"No HPA stabilizationWindowSeconds\nGC CPU spikes cause scale-out/in thrash every few minutes",
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      "strokeColor":"#e67700","backgroundColor":"transparent","roughness":0,"opacity":100,"angle":0},
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    {"type":"text","id":"t8fix","x":670,"y":413,"width":506,"height":32,
      "text":"behavior.scaleUp.stabilizationWindowSeconds: 120\nLonger than any normal GC pause, absorbs spikes before acting",
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    {"type":"text","id":"cat-aot-t","x":62,"y":524,"width":126,"height":40,
      "text":"AOT Startup","fontSize":12,"fontFamily":2,"textAlign":"center",
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    {"type":"text","id":"t9bad","x":200,"y":459,"width":454,"height":30,
      "text":"Using @QuarkusTest for AOT training\nRuns in dev JVM, contributes nothing to app.aot cache",
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    {"type":"text","id":"t9fix","x":670,"y":459,"width":506,"height":30,
      "text":"@QuarkusIntegrationTest runs against packaged JAR and trains cache\nMore endpoints covered means richer cache means faster every start",
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    {"type":"text","id":"t10bad","x":200,"y":501,"width":454,"height":30,
      "text":"Manual -XX:SharedArchiveFile in Dockerfile\nQuarkus sets this automatically, duplicate flag causes startup failure",
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    {"type":"text","id":"t10fix","x":670,"y":501,"width":506,"height":30,
      "text":"Remove from Dockerfile. Set quarkus.package.jar.aot.enabled=true\nQuarkus plugin writes -XX:AOTCache=app.aot into the package",
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    {"type":"text","id":"t11bad","x":200,"y":543,"width":454,"height":30,
      "text":"mvn package instead of mvn verify for AOT\nPackage skips integration tests so cache is empty or minimal",
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    {"type":"text","id":"t11fix","x":670,"y":543,"width":506,"height":30,
      "text":"./mvnw verify runs build + integration tests + writes app.aot\nDrop-in replacement in any CI/CD pipeline",
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    {"type":"text","id":"t12bad","x":200,"y":585,"width":454,"height":32,
      "text":"Unpinned JDK FROM eclipse-temurin:25-jre in Dockerfile\nMinor JDK update invalidates app.aot, silent rebuild, zero gain",
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      "strokeColor":"#1971c2","backgroundColor":"transparent","roughness":0,"opacity":100,"angle":0},
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    {"type":"text","id":"t12fix","x":670,"y":585,"width":506,"height":30,
      "text":"FROM eclipse-temurin:25.0.1-jre pin exact version\nCache is tied to JDK version, mismatch triggers silent full rebuild",
      "fontSize":11,"fontFamily":1,"textAlign":"left",
      "strokeColor":"#0ca678","backgroundColor":"transparent","roughness":0,"opacity":100,"angle":0},

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    {"type":"text","id":"cat-obs-t","x":62,"y":698,"width":126,"height":40,
      "text":"Observability","fontSize":12,"fontFamily":2,"textAlign":"center",
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    {"type":"text","id":"t13bad","x":200,"y":631,"width":454,"height":30,
      "text":"No GC pause histogram in Prometheus\nCannot separate GC-induced latency from real application slowness",
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      "strokeColor":"#2f9e44","backgroundColor":"transparent","roughness":0,"opacity":100,"angle":0},
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    {"type":"text","id":"t13fix","x":670,"y":631,"width":506,"height":30,
      "text":"quarkus.micrometer.distribution.percentiles-histogram.jvm.gc.pause=true\nEnables P99 GC pause bucket. One line in application.properties.",
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    {"type":"text","id":"t14bad","x":200,"y":673,"width":454,"height":30,
      "text":"quarkus-micrometer-registry-prometheus only\nMetrics disconnected from traces, missing unified OTel pipeline",
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    {"type":"text","id":"t14fix","x":670,"y":673,"width":506,"height":30,
      "text":"quarkus-micrometer-opentelemetry unifies metrics + traces + logs\nSingle extension replaces registry-prometheus and opentelemetry",
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      "strokeColor":"#0ca678","backgroundColor":"transparent","roughness":0,"opacity":100,"angle":0},

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    {"type":"text","id":"t15bad","x":200,"y":715,"width":454,"height":30,
      "text":"No PrometheusRule alert on jvm_gc_pause\nGC degradation invisible until SLO breach, no warning before impact",
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      "strokeColor":"#2f9e44","backgroundColor":"transparent","roughness":0,"opacity":100,"angle":0},
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    {"type":"text","id":"t15fix","x":670,"y":715,"width":506,"height":30,
      "text":"Alert: histogram_quantile(0.99, jvm_gc_pause_seconds) > 0.5 for 2m\nFires before users notice, gives 5-10 min lead time on incidents",
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    {"type":"text","id":"t16bad","x":200,"y":757,"width":454,"height":32,
      "text":"Tuning JVM flags without a baseline measurement\nNo before/after data, cannot tell if a change helped or hurt",
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      "strokeColor":"#2f9e44","backgroundColor":"transparent","roughness":0,"opacity":100,"angle":0},
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    {"type":"text","id":"t16fix","x":670,"y":757,"width":506,"height":32,
      "text":"Measure P99 startup + P99 latency + P99 GC pause before any change\nChange one flag at a time. Record. Compare. Conclude.",
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      "strokeColor":"#0ca678","backgroundColor":"transparent","roughness":0,"opacity":100,"angle":0},

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      "text":"Priority order: Memory flags first, then minReplicas:2, then ParallelGCThreads, then HPA metric, then @QuarkusIntegrationTest, then GC histogram, then baseline",
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