JavaInJava (Sun) and Jalapeño (IBM) are both from around 1997. You’d have to dig up some bodies to know which was first. https://www.researchgate.net/publicati

JavaInJava (Sun) and Jalapeño (IBM) are both from around 1997. You’d have to dig up some bodies to know which was first. https://www.researchgate.net/publication/2781745_Implementing_a_Java_Virtual_Machine_in_the_Java_Programming_Language/amp https://www.researchgate.net/publication/2781745_Implementin... http://research.ibm.com/people/j/jdchoi/jalapeno.pdf http://research.ibm.com/people/j/jdchoi/jalapeno.pdf Actually, reading through the papers, JavaInJava didn't implement a JIT and Jalapeño did.