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One of the aspects we have to work around building and improving a dynamic language implementation on the Java Virtual Machine is the way the JVM loads and executes bytecode. In order for JRuby to take advantage of the Hotspot just-in-time (JIT) compiler, JRuby needs to generate Java bytecode at runtime, during execution of Ruby code. If that bytecode gets executed often enough and meets certain other rather mysterious conditions, Hotspot will turn it into machine code.