Explore the G1 garbage collector, the default in JDK 9, in this 30-minute Java conference talk. Delve into the goals and implementation of G1, comparing it to other OpenJDK garbage collectors. Learn about generational region-based memory management and how G1 balances good throughput with pause-time goals. Discover JDK 9 improvements to G1, including string deduplication, class unloading, and reclamation of humongous regions. Gain insights into adaptive concurrent mark, more efficient collections, and a preview of post-JDK 9 features. Conclude with a Q&A session to deepen your understanding of this crucial Java component.