Totally Confused with java.exe

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java.exe is neither a JVM nor an interpreter. It is a launcher – a small program typically written in C which does the following:

  1. Locates an installed JRE
  2. Loads JVM dynamic library (jvm.dll)
  3. Creates a new Java Virtual Machine using the Invocation API
  4. Finds the main class and calls the main() method using JNI

JRE roughly consists of

  1. JVM – jvm.dll
  2. Class Library – rt.jar
  3. Native libraries – the layer between the class library and the OS platform, e.g. java.dll, net.dll, nio.dll, awt.dll etc.
  4. Resources – fonts, properties, strings etc.

Now, the Bytecode Interpreter, the Bytecode Verifier, the Class Loader, the JIT compiler, the Garbage Collector and many other cool stuff – are all parts of the Java Virtual Machine.

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