Heap Dump OOM 자동 덤프

OOM 시 자동 Heap Dump

java -Xms128m -Xmx128m \
  -XX:+HeapDumpOnOutOfMemoryError \
  -XX:HeapDumpPath=/home/jeus7/OOM/heapdump/ \
  -verbose:gc -Xloggc:/home/jeus7/OOM/gc.log \
  -XX:+PrintGCDetails -XX:+PrintGCTimeStamps \
  -classpath . HoldMemoryOOM

• -Xms/-Xmx: 힙 최소·최대
• -XX:+HeapDumpOnOutOfMemoryError: OOM 시 .hprof 자동 생성
• -XX:HeapDumpPath: 덤프 저장 경로

OOM 출력 예:

java.lang.OutOfMemoryError: Java heap space
Dumping heap to /home/jeus7/OOM/heapdump/java_pid4791.hprof ...
Heap dump file created [166556043 bytes in 0.979 secs]

분석: Eclipse Memory Analyzer(MAT), IBM Heap Analyzer 등으로 .hprof 열어 누수 객체 확인.