maven90% confidence\u2191 23
java.lang.OutOfMemoryError: Java heap space
Full error message
Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
Solution
JVM hit the configured max heap. 1. Raise heap: `-Xmx4g` (startup) or `JAVA_OPTS=-Xmx4g`. 2. Generate a heap dump on OOM: `-XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=/tmp/heap.hprof`. Analyze with VisualVM or Eclipse MAT. 3. For containerized apps, set `-XX:MaxRAMPercentage=75` so the JVM respects the cgroup limit.
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