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Which was after JDK 1.0. The JVM was originally implemented as a bytecode interpreter; Sun licensed the Symantec JIT compiler later for 1.1, then eventually add
by rbehrends 11y ago
Which was after JDK 1.0. The JVM was originally implemented as a bytecode interpreter; Sun licensed the Symantec JIT compiler later for 1.1, then eventually added HotSpot several years after 1.0, derived from Smalltalk technology.
The original design of the JVM was for embedded systems, not for running server applications with heaps in the 10s of GB of memory.
The threading model, which allows for near arbitrary sharing of memory, is still a significant source of complexity for both the JIT and the GC and has changed multiple times since the JVM's inception.
Modern JVM implementations have little to do with the original design, but still have to deal with design decisions made 20 years ago for completely different architectures and with only limited foresight.