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GraalVM has released major version 21.0 with a new component, Java on Truffle, that provides a Java Virtual Machine (JVM) implementation written in Java. GraalVM is itself a polyglot virtual machine that provides a shared runtime to execute applications written in multiple languages like Java, Python, and JavaScript.
Prior to this release, running Java applications in GraalVM was possible by using the Java HotSpot VM with the GraalVM Just-In-Time (JIT) compiler, or by compiling to a native executable using GraalVM Native Image. With this release, Java on Truffle, a JVM written in Java using the Truffle framework, provides an additional option to run Java applications.