Java process 100 CPU fix
A pegged Java process can come from code, GC, or threading. Treating them all as the same problem leads to wasted effort.
Common symptoms
- One JVM process saturates CPU
- Throughput stalls while latency rises
- Restarts reduce the issue temporarily
Likely causes
- Hot methods
- Excessive GC cycles
- Thread contention
Evidence to look for
Persistent high CPU in one JVM
Correlation with allocation-heavy paths
Profiling shows concentrated call stacks
What it usually means
You need evidence before deciding whether to tune code, GC, or concurrency.
What to do next
- 1Capture CPU and thread evidence together
- 2Look for repeated stack hotspots
- 3Reduce lock contention and allocation pressure
See what's causing your CPU
cpum.ai turns CPU, process, disk, and memory signals into plain-English explanations with evidence.
Open cpum.ai