Java 21 introduces virtual threads through Project Loom, enhancing memory efficiency and garbage collection. Unlike traditional threads, virtual threads utilize minimal memory and create fewer garbage collection pauses, improving performance under high load. Tests reveal significantly reduced heap pressure and enhanced system responsiveness, particularly in I/O-heavy applications.
Java 25 introduces Compact Object Headers through JEP 519, reducing object header size from 12 bytes to 8 bytes. This change enhances memory efficiency, leading to lower cloud costs by decreasing heap space usage and garbage collection frequency. As a result, applications experience better performance with reduced memory pressure.
This content discusses the intricacies of Java Garbage Collection (GC), focusing on memory management challenges and performance impacts during application runtime. It highlights issues caused by large object allocations, optimal strategies like streaming deserialization, and modern alternatives such as ZGC and Shenandoah, emphasizing the need for careful GC monitoring to maintain efficiency.