# 06-shenandoah (JEP 535: generational mode by default)
--- JDK 28 EA build, -XX:+UseShenandoahGC:
Error occurred during initialization of VM
Option -XX:+UseShenandoahGC not supported
--- JDK 25 Temurin, -XX:+UseShenandoahGC -Xlog:gc*:
[0.007s][info][gc     ] Using Shenandoah
[0.009s][info][gc,init] Mode: Snapshot-At-The-Beginning (SATB)
[0.016s][info][gc,metaspace] CDS archive(s) mapped at: [0x0000000020000000-0x0000000020d96000-0x0000000020d96000), size 14245888, SharedBaseAddress: 0x0000000020000000, ArchiveRelocationMode: 1.