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Does every execution of java command start a separate JVM?
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Each java invocation starts its own JVM.
Generally speaking, each application will get its own JVM instance and its own OS-level process and each JVM instance is independent of each other.
Each Java application uses an independent JVM. Each JVM is a separate process, and that means there is no sharing of stacks, heaps, etcetera.
The way to start a jvm is by invoking the main, either by invoking a jar using java -jar MyJar or by simply running main class from an IDE. Yes, Multiple jvm instances can be run on a single machine, they all will have their own memory allocated. There will be that many jvms as many main programs you run.
Yes, it does start a separate JVM.
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Yes, you get a separate VM.
Some class resources can be shared (class data sharing). This is by default enabled, e.g. it's automatically used when possible.
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