OpenJDK 21 aarch64 bootclasspath mismatch causing class‑loading failures

OpenJDK 21 provides official aarch64 binaries, yet its default configuration continues to reference x86_64 bootclasspath entries, which triggers class‑loading failures on many Linux distributions. The documentation indicates that the -Djava.endorsed.dirs flag must point to the appropriate lib directory, but the quick‑start guide omits the recommended value, leaving users uncertain about the correct JVM setup.

The precise goal is to configure the aarch64 JVM so that its bootclasspath and endorsed directories align with the native architecture, thereby preventing class‑initialization errors and performance regressions. Which exact bootclasspath entry must be used for aarch64 in OpenJDK 21? What directory path should be supplied via -Djava.endorsed.dirs to reference the correct lib directory? Is there a reliable verification step to confirm the JVM is loading native aarch64 libraries rather than falling back to x86_64 emulation?