"which is the default garbage collector of the HotSpot JVM, is designed to balance latency and throughput, achieving this balance sometimes impacts application performance adversely compared to throughput-oriented garbage collectors such as the Parallel and Serial collectors: Relative to Parallel, G1 performs more of its work concurrently with the application, reducing the duration of GC pauses and thus improving latency. Unavoidably, this means that application threads must share the CPU with GC threads, and coordinate with them. This synchronization both lowers throughput and increases latency."
"The HTTP/3 proposal calls for allowing Java libraries and applications to interact with HTTP/3 servers with minimal code changes. Goals include updating the HTTP Client API to send and receive HTTP/3 requests and responses; requiring only minor changes to the HTTP Client API and Java application code; and allowing developers to opt in to HTTP/3 as opposed to changing the default protocol version from HTTP/2 to HTTP/3."
G1 aims to balance latency and throughput but concurrent execution of GC work causes application threads to share CPU with GC threads, introducing synchronization and lowering throughput. The concurrent behavior of G1 reduces pause durations and improves latency relative to Parallel, but coordination costs can increase overall latency and reduce application throughput. JDK 26 is planned as a short-term release backed by six months of Premier-level support and will follow the September 16 JDK 25 Long-Term Support release. The HTTP/3 proposal intends to enable Java libraries and applications to interact with HTTP/3 servers with minimal code changes by updating the HTTP Client API and allowing developers to opt in. HTTP/3 is built on IETF QUIC, which provides flow-controlled streams, low-latency connection establishment, network path migration, and integrated security.
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