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Walk in News : (12/05/15) 1> Dream Tekis Software Pvt. Ltd (call based u can try there, confirmed news, 2013, 14 batch ) Criteria: BE/Btech(cse,it,ece,eee,et,ei,is,)MCA, Mtech(60% through out) Profile : java developer Ti...

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How to stop pendrives from getting unwanted viruses ? How to remove virus from pendrives Today, A big problem for windows user is to secure their data from viruses. Especially, in Pendrives, no one wants to keep their important data in pendrives becau...

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Confirm Walkin- 14/Apl/2015 1. Siemens Technology : Junior Specialist Job Description : *Good communication skills *Good in accouting skills *Exp : 0 yrs *Should be flexible to work in rotational shifts *Only Accounting gradu...

Confirm Walkin- 8/Apl/2015 1. SPANEOS SOFTWARE : Trainee Software Engineer Compensation : Rs 1.80 - 2.40 LPA Based on Knowledge and Skills Qualification - Eligibility Criteria BE / B.Tech / MCA / M.Tech Batch - 2014 Passout ...

Internal Architecture of JVM

Internal Architecture of JVM

1) Classloader:

Classloader is a subsystem of JVM that is used to load class files.

2) Class(Method) Area:

Class(Method) Area stores per-class structures such as the runtime constant pool, field and method data, the code for methods.

3) Heap:

It is the runtime data area in which objects are allocated.

4) Stack:

Java Stack stores frames.It holds local variables and partial results, and plays a part in method invocation and return.
Each thread has a private JVM stack, created at the same time as thread.
A new frame is created each time a method is invoked. A frame is destroyed when its method invocation completes.
5) Program Counter Register:

PC (program counter) register. It contains the address of the Java virtual machine instruction currently being executed.

6) Native Method Stack:

It contains all the native methods used in the application.

7) Ex*****on Engine:

It contains:
1) A virtual processor
2) Interpreter:Read bytecode stream then execute the instructions.
3) Just-In-Time(JIT) compiler:It is used to improve the performance.JIT compiles parts of the byte code that have similar functionality at the same time, and hence reduces the amount of time needed for compilation.Here the term ?compiler? refers to a translator from the instruction set of a Java virtual machine (JVM) to the instruction set of a specific CPU.