Is there one JVM per Java application?

Question

Is the same JVM used by all Java applications running or, does \'one JVM per Java application\' apply? (say the applications are IntelliJ IDEA, a server and NetBeans for exa

Answer 1

In theory you can run multiple applications in a JVM. In practice, they can interfere with each other in various ways. For example:

• The JVM has one set of System.in/out/err, one default encoding, one default locale, one set of system properties, and so on. If one application changes these, it affects all applications.
• Any application that calls System.exit() kills all applications.
• If one application thread goes wild, and consumes too much CPU or memory it will affect the other applications too.