Free Report: Mastering Java Bytecode at the Core of the JVM

Take a byte of this code! By Anton Arhipov, JRebel Product Lead

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Why Should I Know About Java Bytecode?

Mastering Java Bytecode

Whether you are a Java developer or architect, CxO or simply the user of a modern smartphone, Java bytecode is in your face, quietly supporting the foundation of the Java Virtual Machine (JVM).

Directors, executives and non-technical folks can take a breather here: All they need to know is that while their development teams are building and preparing to deploy the next amazing version of their software, Java bytecode is silently pumping through the JVM platform.

Put simply, Java bytecode is the intermediate representation of Java code (i.e. class files) and it is executed inside the JVM – so why should you care about it? Well, because you cannot run your entire development ecosystem without Java bytecode telling it all what to do, especially how to treat and define the code that Java developers are writing.

From a technical POV, Java bytecode is the code set used by the Java Virtual Machine that is JIT-compiled into native code at runtime. Without Java bytecode behind the scenes, the JVM would not be able to compile and mirror the non-bytecode Java code developers write to add new features, fix bugs and produce beautiful apps.