Memory Segment
Memory Segment — A bounded region abstraction in Java's Foreign Function and Memory API for controlled access to on-heap, off-heap, or mapped memory.
JVM Runtime Context
A MemorySegment is a bounded memory-region abstraction used by Java's Foreign Function and Memory API for heap, native, or mapped memory. Slicing and ValueLayout operations make structured native data accessible while the segment's scope controls lifetime and access validity.
Ownership Boundary
A memory segment is not a Java array. Accessibility and ownership depend on the associated Arena and scope; once that lifetime ends, access is rejected rather than silently continuing with a stale native address.