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The Java Virtual Machine has memory other than the heap, referred to as Non-Heap Memory. By default, the maximum heap size is set to 64 MB. Maximum heap size can be set using –Xmx option. The heap can be of fixed size or variable size depending on the garbage collection strategy. The size of the heap can be specified using –Xms VM option. The heap is created when the Java Virtual Machine starts up and may increase or decrease in size while the application runs. Heap memory is the run time data area from which the memory for all java class instances and arrays is allocated. JVM memory is divided into multiple parts: Heap Memory, Non-Heap Memory, and Other. The Java Virtual Machine loads the code, verifies the code, executes the code, manages memory (this includes allocating memory from the Operating System (OS), managing Java allocation including heap compaction and removal of garbage objects) and finally provides the runtime environment. But the implementation has been provided by Sun and other companies), implementation (known as (JRE) Java Runtime Environment) and instance (after writing Java command, to run Java class, an instance of JVM is created).

There are three notions of JVM: specification (where working of JVM is specified. The JVM is an abstract computing machine that enables a computer to run a Java program.

Uninstall apache tomcat 8 in windows dzone