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Java Virtual System (JVS) is built around a virtual file system (VFS) - a common platform of Java, by Java, for Java. JVS extends JVM and makes it from an interpreter running half-compiled code a first-class server.
High Availability using Virtualization:
Set up two servers (main and backup). The backup should come into action when the main goes down, & should continue the operation that the main was running, exactly from the point of failure, without loss of data.