File memory mapping

try (FileChannel channel =
    FileChannel.open(path,
        StandardOpenOption.READ,
        StandardOpenOption.WRITE)) {
    MappedByteBuffer buffer =
        channel.map(
            FileChannel.MapMode.READ_WRITE,
            0, (int) channel.size());
    // Limited to 2GB
    // Freed by GC, no control
}

FileChannel channel =
    FileChannel.open(path,
        StandardOpenOption.READ,
        StandardOpenOption.WRITE);
try (Arena arena = Arena.ofShared()) {
    MemorySegment segment =
        channel.map(
            FileChannel.MapMode.READ_WRITE,
            0, channel.size(), arena);
    // No size limit
    // ...
} // Deterministic cleanup

📏

No size limit

Map files larger than 2GB without workarounds.

🔒

Deterministic cleanup

Arena ensures memory is freed at scope exit, not GC time.

⚡

Better performance

Aligned with modern memory models and hardware.