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JVM is an abstraction. It's a software layer specifically designed to allow the Java language to be platform-agnostic by relying on the existence of a specs-compatible runtime engine "everywhere." But ... one size does not fit all. If you're trying to "wedge" Java into a very small environment, such as an underpowered (but cheap) Android-style mobile ...


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Java is a spec, not a product Java is not a specific product or binary. The Java platform is defined by a set of specifications for the language and the JVM, plus JSRs and JEPs. You said: the official JVM implementation that Oracle provides There is nothing "official" about any particular Java implementation. Any implementation that fully implements ...


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It’s called competition. If I think I can create a JVM that is sufficiently better and make money selling it, that’s what I will do.


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Why might I, as a developer be dissatisfied with the official JVM implementation that Oracle provides and decide to build up a different one? Which one? Oracle has at least three different official JVM implementations! A couple of reasons why one might develop a JVM implementation are: Platform support: you want to run Java on a platform for which Oracle ...


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