01
middle⏱ 28 min
Thread Pool Starvation in Spring
API latency spikes under moderate load. Requests queuing up.
Spring BootThread PoolAsync
⚙️
Application Profiling
Heap dumps, thread analysis, and GC tuning
📚 4 cases⏱ 9 hoursMiddle → Senior2 Middle2 Senior
Cases in this track
02
senior⏱ 38 min
G1GC Stop-the-World Pauses Under Load
P99 latency spikes to 4s every 2 minutes. GC logs reveal the pattern.
JVMG1GCGC Tuning
03
senior⏱ 35 min
JVM Memory Leak Under Load
App crashes at 600 RPS. Heap dumps collected. Old Gen filling suspiciously.
JVMHeap DumpJavaGC
04
middle⏱ 25 min
Node.js CPU-Bound Operation Blocking Event Loop
Express API becomes unresponsive during PDF generation.
Node.jsEvent LoopCPU Profiling