JVM Flags for debugging

jvm-flags-debug

# Activate Automatic Heap Dump on OutOfMemory
-XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=/path/to/location/`date +%Y%m%d`.hprof

# Activate basic GC logging
-XX:+PrintGC

# Activate detailed GC logging
-XX:+PrintGCDetails

# Add Timestamps (can be used with basic or detailed GC logging)
-XX:+PrintGCTimeStamps

# GC logging to a file
-Xloggc:/path/to/location/gc.log

# GC file rotation
-XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=10 -XX:GCLogFileSize=10M

# Check wheter a class is loaded or unloaded from the JVM
-XX:+TraceClassLoading
-XX:-TraceClassUnloading