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Sep 13, 2018

InvokeDynamic is one of the most significant additions to modern Java: Here's why


Many Java developers regarded the JDK’s version seven release as somewhat a disappointment. On the surface, merely a few language and library extensions made it into the release, namely Project Coin and NIO2. But under the covers, the seventh version of the platform shipped the single biggest extension to the JVM’s type system ever introduced after its initial release. Adding the invokedynamic instruction did not only lay the foundation for implementing lambda expressions in Java 8, it also was a game changer for translating dynamic languages into the Java byte code format. While the invokedynamic instruction is an implementation detail for executing a language on the Java virtual machine, understanding the functioning of this instruction gives true insights into the inner workings of executing a Java program. This article gives a beginner’s view on what problem the invokedynamic instruction solves and how it solves it.




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