Differences between Java Virtual Machine and Java HotSpot ??

I am little bit confused between Java Virtual Machine and Java HotSpot.
My understanding is:
Java Virtual Machine is the environment to execute Java programs. I think I could understand this part.
However, the description says, "The Java HotSpot product line consists of a server-side and a client-side virtual machine that share the Java HotSpot runtime environment, but have different compilers suited to the different performance characteristics of clients and servers."
I am confused with server-side virtual machine. what is that?? Does it mean the environment to execute Java programs remotely through network?? For example, Java plug-in.?? Please advise.

Hotspot is a JVM.
Hotspot has different configuration settings. Some of those settings are better suited for a client application. Some are better suited to server applications.

Similar Messages

Garbage collection Java Virtual Machine : Hewlett-Packard Hotspot release 1.3.1.01

"Hi,
I try and understand the mechanism of garbage collection of the Java Virtual Machine : Hewlett-Packard Hotspot release 1.3.1.01.
There is description of this mechanism in the pdf file : "memory management and garbage collection" available at the paragraph "Java performance tuning tutorial" at the page :
http://h21007.www2.hp.com/dspp/tech/tech_TechDocumentDetailPage_IDX/1,1701,1607,00.html
Regarding my question :
Below is an extract of the log file of garbage collections. This extract has 2 consecutive garbage collections.
(each begins with "<GC:").
<GC: 1 387875.630047 554 1258496 1 161087488 0 161087488 20119552 0 20119552
334758064 238778016 335544320
46294096 46294096 46399488 5.319209 >
<GC: 5 387926.615209 555 1258496 1 161087488 0 161087488 0 0 20119552
240036512 242217264 335544320
46317184 46317184 46399488 5.206192 >
There are 2 "full garbage collections", one of reason "1" and one of reason "5".
For the first one "Old generation After " =238778016
For the second "Old generation After " =238778016
Thus, "Old generation Before garbage collection" of the second is higher than "Old generation After garbage collection". Why?
I expected all objects to be allocated in the "Eden" space. And therefore I did not expect to s

I agree but my current Hp support is not very good on JVM issues.
Rob Woollen <[email protected]> wrote:
You'd probably be better off asking this question to HP.
-- Rob
Martial wrote:
The object of this mail is the Hewlett-Packard 1.3.1.01 Hotspot JavaVirtual Machine
release and its garbage collection mechanism.
I am interested in the "-Xverbosegc" option for garbage collectionmonitoring.
I have been through the online document :
http://www.hp.com/products1/unix/java/infolibrary/prog_guide/java1_3/hotspot.html#-Xverbosegc
I would like to find out more about the garbage collection mechanismand need
further information to understand the result of the log file generatedwith the
"-Xverbosegc"
For example here is an extract of a garbage collection log file generatedwith
Hewlett-Packard Hotspot Java Virtual Machine. Release 1.3.1.01.
These are 2 consecutive rows of the files :
<GC: 5 385565.750251 543 48 1 161087488 0 161087488 0 0 20119552 264184480255179792
335544320 46118384 46118384 46137344 5.514721 >
<GC: 1 385876.530728 544 1258496 1 161087488 0 161087488 20119552 020119552 334969696
255530640 335544320 46121664 46106304 46137344 6.768760 >
We have 2 full garbage collections, one of Reason 5 and the next oneof Reason
1.
What happened between these 2 garbage collections as we got : "Oldgeneration
After" of row 2 is higher than "Old generation Before" of row 1? Iexpected Objects
to be initially allocated in eden and so we could not get "old generation2modified
between the end of one garbage collection and before the next one.
Could you please clarify this issue and/or give more information aboutgarbage
collection mechanisms with the Hewlett-Packard Hotspot Java VirtualMachine. Release
1.3.1.01.

Java virtual machine and yahoo/pogo

i am trying to play yahoo and pogo games, and it pops up that i need to download java virtual machine for it to load, i do, then it goes to MS website saying i need a more recent version of JVM to get to that screen. I got MSIE 6. i need to play these games. please help. help.

I just experienced this issue and found a solution. What operating systems are you running. I am on Windows XP. I downloaded Java Virtual Machine (which can be found on this website) and it worked fine until I allowed my system to receive an update on the Microsoft Virtual Machine. This is a brand new computer and had the windows update alerts. I had to restore my system to the day before I allowed update and everything is working again. I suggest downloading Java virtual Machine. No one else on here was helping and Gateway had no clue how to help me. After three weeks I figured this out by myself.....I hope this fix works for you!
Patty

HT203176 my computer hangs frequently - rolling beach ball - apparently some endless loops - I have repaired the permissions countless times but the problem continues - the faulty permissions include java virtual machine and language libraries

I get the rolling beach ball frequently when using a browser -I have repaired the permissions a number of times - each time I do this - the same issues show up- language libraries, java virtual machine etc - after a restart the btowser works for awhile and then hangs again - i trashed both Chrome and Firefox and am now using Safari and Opera - neither of which work very fast and I still get a frozen screen - rolling beach ball - have to force quit.On the activity monitor it shows that the browser I am using has several hangs.
Aside from reinstalling everything - is there a fix for this?

Those Permissions errrors will keep appearing. They are not errors; ignore them. Your problem has nothing to do with Permissions repair. Many possible causes, one of which may be A-V. Do you have any A-V installed?
What does Disk Utility show for SMART Status for the drive? Verify the Disk.
Open Activity Monitor>CPU tab. Anything hogging the CPU when the slowdowns occur? Switch to the Memory tab. What does it show for free and inactive? Also, Page ins, Page outs and Swap used?'
How many applications open concurrently when this happens?
How much drive free space? You should maintain at least around 20-30GB.

Difference between reverse proxy plugin and java web proxy server

Hello
Can anyone please let me know what exactly is the difference between the reverse proxy plugin available with java system web server and the
java web proxy server.
Thanks
Manik Gupta.

The features are very closely related. The most notable and obvious difference is that The Web Proxy Server reverse proxy makes use of a content cache, while the reverse proxy of the Web Server does not cache results.
Message was edited by:
JoeMcCabe

Differences between VMware virtual switches and HyperV virtual switches

Hello,
I've deployed an OpenVpn infrastructure (configured in bridging mode) within a VMmare ESX4 environment.
The scenario is this:
A remote client connects to the OpenVpn server (VM1), VM1 also owns an interface where traffic passes in tagged mode complaint to vlan 8021q, VM2 owns a interface on the vlan10. VM1 can ping VM2 without any problem (supposing vlan 10 traffic), but the remote
client cannot ping VM2.
The scenario works perfectly in a physical environment (without any virtual machine).
The scenario is like this:
Analizing traffic with Wireshark on the VM2 I've noticed that an ARP request leaves from the remote client MAC to the destination host interface of VM2 (broadcast ARP request).
The host VM2 sends an ARP reply directly to the MAC address of the remote client.
This last packet doesn't pass the vSwitch, so it isn't received by the remote client and the ping fails.
This occurs because the VMware ESX vSwitch only knows all the MACs of virtual machines within the ESX environment, it doesn't learn MAC addresses like a physical real switch and it discards packets sent to unknown unicast MAC addresses (broadcast traffic instead
is passed). Within the VMware infrastructure this is solvable only by using of the Promiscuos mode feature of the virtual switch port.
I would like to ask if HyperV virtual switches work like VMware ESX virtual switches. So in Hyper-V virtual switches do learn mac addresses actually like a physical switch?

This last packet doesn't pass the vSwitch, so it isn't received by the remote client and the ping fails. This occurs because the VMware ESX vSwitch only knows all the MACs of virtual machines within the ESX environment, it doesn't learn MAC addresses
like a physical real switch and it discards packets sent to unknown unicast MAC addresses (broadcast traffic instead is passed). Within the VMware infrastructure this is solvable only by using of the Promiscuos mode feature of the virtual switch port.
Thank you; I did the same in Wireshark and noticed the ARP reply was not being received by my VMware guest Hyper-V host, so I did an Internet search and found this document at the top of the list. For other people that came here because their VMware guest
Hyper-V lab server's SCVMM 2012 SP1 logical switch virtual network adapter combination could not ping other VMware guests; In addition to "Accept" for your VMware vSwitch (described above), you will need to change your VM Network VLAN ID to "All".

Java Virtual Machine and page swaping ..

Hi,
Could you please tell me if the JVM based on page swapping or not?
I am asking this question because of the following:
1- on my laptop I have only 256MB and I set the heap size to -Xms=512MB
-Xmx=1024MB and the heap starts working.
2- I note that there is many many access to my hard disk while running my application and this process degrade the total performance.
Does this mean that JVM use page swapping in some how to cover the amount of memory set by -Xms,-Xmx.
in other experiment on other machine with 2GB RAM, I tried to keep hashtable of size approximately = 100MB (this is the size of all keys + all values only without the skeleton of the hashtable i.e. the pointers). I note that the system becomes very slow writing to the hashtable and there was a great access to the harddisk!?
Having two GB RAM means at lease we can store a hashtable of total size =1GB in memory?!!!!
Please tell me what is the problem.
Many thanks,
Regards,
Ahmad.
Message was edited by:
user525205

Hi Ahmad,
With a 32-bit JVM you could potentially initialize a maximum heap size of 4GB. Though, in most of the cases this amount is little under 4GB or a little under 2GB. In the case of your system, which has 256MB if you set a maximum heap size of 1024MB/1GB, then the JVM will swap to disk pages to account for the extra space needed.
Now, for the other case, the machine with 2GB of RAM, you probably are seeing disk I/O due to flushing the buffer caches when syncing, checkpointing, trickling etc. What are the exact operations you're performing when you see the application going to disk? You can use the output of "db_stat -m -h <env_path>" to display the cache statistics, and "db_stat -d <db_file> -h <env_path>" to obtain statistics for a particular database within the environment.
Regards,
Andrei

Jvm-java virtual machine

Hai iam new to this forum and as well i just started to learn java iwant to know in brief about JVM
i think it may be silly question but as i am bigginer to java kindly expect reply

georgemc wrote:
faustofrancis wrote:
A Java Virtual Machine (JVM) is a set of computer software programs and data structures which use a virtual machine model for the execution of other computer programs and scripts. The model used by a JVM accepts a form of computer intermediate language commonly referred to as Java bytecode. This language conceptually represents the instruction set of a stack-oriented, capability architecture.
Java Virtual Machines operate on Java bytecode, which is normally (but not necessarily) generated from Java source code; a JVM can also be used to implement programming languages other than Java. For example, Ada source code can be compiled to Java bytecode, which may then be executed by a JVM. JVMs can also be released by other companies besides Sun (the developer of Java) -- JVMs using the "Java" trademark may be developed by other companies as long as they adhere to the JVM specification published by Sun (and related contractual obligations).
The JVM is a crucial component of the Java Platform. Because JVMs are available for many hardware and software platforms, Java can be both middleware and a platform in its own right  hence the expression "write once, run anywhere." The use of the same bytecode for all platforms allows Java to be described as "compile once, run anywhere", as opposed to "write once, compile anywhere", which describes cross-platform compiled languages. The JVM also enables such unique features as Automated Exception Handling which provides 'root-cause' debugging information for every software error (exception) independent of the source code.
The JVM is distributed along with a set of standard class libraries which implement the Java API (Application Programming Interface). The virtual machine and API have to be consistent with each other[dubious  discuss] and are therefore bundled together as the Java Runtime Environment.
Execution environment
Programs intended to run on a JVM must be compiled into a standardized portable binary format, which typically comes in the form of .class files. A program may consist of many classes in different files. For easier distribution of large programs, multiple class files may be packaged together in a .jar file (short for Java archive).
The JVM runtime executes .class or .jar files, emulating the JVM instruction set by interpreting it, or using a just-in-time compiler (JIT) such as Sun's HotSpot. JIT compiling, not interpreting, is used in most JVMs today to achieve greater speed. Ahead-of-time compilers that enable the developer to precompile class files into native code for a particular platform also exist.
Like most virtual machines, the Java Virtual Machine has a stack-based architecture.
Although the JVM was primarily aimed at running compiled Java programs, other languages can now run on top of it[1], such as:
* Ruby, with JRuby
* JavaScript, with Rhino
* Python, with Jython
* Common Lisp, with Armed Bear Common Lisp
* Groovy
* Scala
[edit] Bytecode verifier
A basic philosophy of Java is that it is inherently "safe" from the standpoint that no user program can "crash" the host machine or otherwise interfere inappropriately with other operations on the host machine, and that it is possible to protect certain functions and data structures belonging to "trusted" code from access or corruption by "untrusted" code executing within the same JVM. Furthermore, common programmer errors that often lead to data corruption or unpredictable behavior such as accessing off the end of an array or using an uninitialized pointer are not allowed to occur. Several features of Java combine to provide this safety, including the class model, the garbage-collected heap, and the verifier.
The JVM verifies all bytecode before it is executed. This verification consists primarily of three types of checks:
* Branches are always to valid locations
* Data is always initialized and references are always type-safe
* Access to "private" or "package private" data and methods is rigidly controlled.
The first two of these checks take place primarily during the "verification" step which occurs when a class is loaded and made eligible for use. The third is primarily performed dynamically, when data items or methods of a class are first accessed by another class.
The verifier permits only some bytecode sequences in valid programs, e.g. a jump (branch) instruction can only target an instruction within the same function or method. Because of this, the fact that JVM is a stack architecture does not imply a speed penalty for emulation on register-based architectures when using a JIT compiler. In the face of the code-verified JVM architecture, it makes no difference to a JIT compiler whether it gets named imaginary registers or imaginary stack positions that need to be allocated to the target architecture's registers. In fact, code verification makes the JVM different from a classic stack architecture whose efficient emulation with a JIT compiler is more complicated and typically carried out by a slower interpreter.
Code verification also ensures that arbitrary bit patterns cannot get used as an address. Memory protection is achieved without the need for a MMU. Thus, JVM is an efficient way of getting memory protection on simple architectures that lack an MMU. This is analogous to managed code in Microsoft's .NET CLR, and conceptually similar to capability architectures such as the Plessey 250, and IBM System/38.
[edit] Bytecode instructions
Main article: Java bytecode
The JVM has instructions for the following groups of tasks:
* Load and store
* Arithmetic
* Type conversion
* Object creation and manipulation
* Operand stack management (push / pop)
* Control transfer (branching)
* Method invocation and return
* Throwing exceptions
* Monitor-based concurrency
The aim is binary compatibility. Each particular host operating system needs its own implementation of the JVM and runtime. These JVMs interpret the byte code semantically the same way, but the actual implementation may be different. More complicated than just the emulation of bytecode is compatible and efficient implementation of the Java core API which has to be mapped to each host operating system.
[edit] Secure execution of remote code
A virtual machine architecture allows very fine-grained control over the actions that code within the machine is permitted to take. This is designed to allow safe execution of untrusted code from remote sources, a model used by Java applets. Applets run within a VM incorporated into a user's browser, executing code downloaded from a remote HTTP server. The remote code runs in a restricted "sandbox", which is designed to protect the user from misbehaving or malicious code. Publishers can purchase a certificate with which to digitally sign applets as "safe", giving them permission to ask the user to break out of the sandbox and access the local file system and network...
[edit] C to bytecode compilers
From the point of view of a compiler Java bytecode is just another processor with an instruction set for which code can be generated. The JVM was originally designed to execute programs written in the Java language. However, the JVM provides an execution environment in the form of a bytecode instruction set and a runtime system that is general enough that it can be used as the target for compilers of other languages.
Because of its close association with Java the JVM performs the runtime checks mandated by the Java specification. This can make it technically difficult to translate C code (which is much more lax with regard to runtime checking) to the JVM and expect it to run without issuing any warnings.
Compilers targeting many different languages, including Ada and COBOL, have been written.
[edit] Licensing
Starting with J2SE 5.0, changes to the JVM specification have been developed under the Java Community Process as JSR 924[2]. As of 2006, changes to specification to support changes proposed to the class file format (JSR 202[3]) are being done as a maintenance release of JSR 924. The specification for the JVM is published in book form,[4] known as "blue book". The preface states:
We intend that this specification should sufficiently document the Java Virtual Machine to make possible compatible clean-room implementations. Sun provides tests which verify the proper operation of implementations of the Java Virtual Machine.
Sun's JVM is called HotSpot. Clean-room Java implementations include Kaffe and IBM J9. Sun retains control over the Java trademark, which it uses to certify implementation suites as fully compatible with Sun's specification.
[edit] See also
* HotSpot, Sun's Virtual Machine
* Da Vinci Machine, a starting Sun project aiming to prototype the extension of the JVM to add support for dynamic languages.
* List of Java virtual machines
* Automated Exception Handling
* Common Language Runtime
* Parrot virtual machine
* Java bytecode
* Class (file format)
* Java performance
* List of compilers
[edit] Notes
1. ^ Tolksdorf, Robert (2005). Languages for the Java VM. Retrieved on 2008-04-23.
2. ^ JSR 924  Specifies changes to the JVM specification starting with J2SE 5.0
3. ^ JSR 202  Specifies a number of changes to the class file format
4. ^ The Java Virtual Machine Specification (the first and second editions are also available online)
[edit] References
* Clarifications and Amendments to the Java Virtual Machine Specification, Second Edition includes list of changes to be made to support J2SE 5.0 and JSR 45
* JSR 45  Specifies changes to the class file format to support source-level debugging of languages such as JSP and SQLJ that are translated to Java
[edit] External links
* The Java Virtual Machine Specification
* Java-Virtual-Machine.net - All about Java Virtual Machines!
* List of languages which compile to the Java virtual machine.
* A decade after Java arrived, there have been improvements in the runtime performance of platform-independent virtual-machine based software.
* Kaffe.org - the Kaffe project
* JamVM - The Jam Virtual Machine
* The lean, mean, virtual machine - An introduction to the basic structure and functionality of the Java Virtual Machine
* Java Glossary - installing Java useful tips for installing Java for users and developers
* Test your Java Virtual Machine
* A list of Java VM-s used in mobile devices
* More Languages for the JVM
* Sun to build virtual machine for iPhone - ComputerWorldAre you aware that Wikipedia has ripped off your post?not yet?
Let me see if the systems work!

Error while installing SOA, "Could not create java virtual machine"

I am trying to install SOA latest release, but am getting an error stating "Could not create java virtual machine" and just that. No log, nothing. Could anybody help me out on this?

Is JRE installed on your machine?
If yes it may get corrupted, try to remove and reinstall jre again. Then try to install SOA.

Problem with java virtual machine

hi i tried to install football manager 2007 nad it started a different installer that were using java virtual machine.i have the latest java virtual machine installed to my computer.after it loads the java virtual machine and the window closes , nothing happens.my computer continues work normally but the installation doesn't continue.! hope that someone can help me.

Hi
I'm having the same problem.
I run the .exe file, and the installation hangs. I've tried running the .jar file instead, and get a JVM not found error.
Hope someone can help. Thanks.

Message "Failed to create Java Virtual Machine" after starting Design Studio 1.2 SP1

Hi experts,
after I installed the SP1 of Design Studio 1.2 I become the Message "Failed to create java virtual machine" and I´m not able to start the Design Studio.
My java version is 1.7
My SapDesignStudio.ini File (C:\Program Files\SAP BusinessObjects\Design Studio) looks like as follow:
-startup
plugins/org.eclipse.equinox.launcher_1.3.0.v20130327-1440.jar
--launcher.library
plugins/org.eclipse.equinox.launcher.win32.win32.x86_1.1.200.v20130521-0416
-name
SAP
BusinessObjects
Design
Studio
-vmargs
-Xmx1024m
-Xms256m
-XX:PermSize=32m
-XX:MaxPermSize=512m
-XX:+HeapDumpOnOutOfMemoryError
-Dfile.encoding=UTF-8
-Dosgi.requiredJavaVersion=1.6
-Djava.net.preferIPv4Stack=true
-Djdk.xml.entityExpansionLimit=0
-Djavax.net.ssl.trustStoreProvider=SunMSCAPI
-Djavax.net.ssl.trustStoreType=Windows-ROOT
-Dorg.osgi.framework.os.name=win32
Any ideas or experiences?
Many thanks and regards,
Michael

Hello Max,
many thanks for your reply and your in my case absolutely correct answer!
In respect to your solution proposal I have renamed my Analysis-workspace folder to "Analysis-workspace-V0"
After I have started the Design Studio 1.2 SP1 a new Analysis workspace folder was created with the typical standard name "Analysis-workspace"
So I have my old Design Studio Application and an new empty Analysis folder.
By the way, in my case in addition to the folder rename it was necessary to change the -Xmx Value (SapDesignStudio.ini File) a little bit lower as in standard (in the DS1.2 SP1 setting) 1024m. To become not the Message "Failed to create Java Virtual Machine" I have changed the -Xmx Value from 1024m to 512m.
Now I´m able to start the Design Studio 1.2 SP1 as expected without Message and without breaks down after 5-6 seconds during the startup.
Thanks again!
Best regards,
Michael

Error - Java Virtual Machine cannot be loaded

I have installed J2SE Runtime Environment 5.0 Update 10 and have been trying to run Hp Openview Service Desk 4.5, when I try to run it's client application I get the error
"Unable to start the application -- the Java Virtual Machine cannot be loaded. Class no registered."
I've tried reinstalling both as well as rebooting after each installation to no avail.. any help would be greatly appreciated.
thanks

Installing the Java Virtual Machine
The Java Virtual Machine is a program that is necessary for running Java programs such as PhotoSite AlbumBuilder. To install the Microsoft Java Virtual Machine, download and run the appropriate installer below. After you install it, restart your computer.
Windows 98/NT/ME/XP/2000 (SP1/SP2) users:
http://support.photosite.com/msjavx86.exe
Windows 2000 (SP3) users:
http://support.photosite.com/Q300845.exe
Windows 2000 users (Service Pack 4):
Microsoft provides no installer for Windows 2K + SP4. You must either revert to an earlier Service Pack or upgrade to Windows XP instead.
* NOTE: You must be logged into an "Administrator" account to install the Virtual Machine.

I have updated my iTunes to the newest version, 10-25 on a windows XP system. Now my java virtual machine is not working and I need it to run applet window. My Java is also newest version. What can I do to fix/repair my issue?

I need help with java on windowsXP after updating iTunes to the latest version. My java will not work and I get error message need java virtual machine to run applet window. Did not have this problem prior to the iTunes update.
Please help, Thanks

If your library was working on your computer and then popped up empty all of a sudden then this might be what you need...
Empty/corrupt library after upgrade/crash
Hopefully it's not been too long since you last upgraded iTunes, in fact if you get an empty/incomplete library immediately after upgrading then with the following steps you shouldn't lose a thing or need to do any further housekeeping. In the Previous iTunes Libraries folder should be a number of dated iTunes Library files. Take the most recent of these and copy it into the iTunes folder. Rename iTunes Library.itl as iTunes Library (Corrupt).itl and then rename the restored file as iTunes Library.itl. Start iTunes. Should all be good, bar any recent additions to or deletions from your library.
See iTunes Folder Watch for a tool to catch up with any changes since the backup file was created.
When you get it all working make a backup!
tt2

Saving files and future Java Virtual Machine updates questions

So I've made A program that keeps a list of Ingredients and Recipes for my dads small business. This program is currently on 3 computers my dads, the secretaries, and mine. I made it so it saved and loaded from a shared folder in the network where all the computers has access. The secretary and my dads computer saved and loaded the program fine with changes from one to the other, but mine wouldn't. If I save what information I put on my computer the other computers could no longer load the save file. If i saved something on the secretary or dads computer then my computer would not be able to load the file.
well i solved this problem by re downloading Java virtual machine on my computer.
this brings me to my question:
Will future virtual machine updates make it so the program can't read old .dat files (I've been using ObjectInputStreams and ObjectOutputStreams to save and load)
Sorry for the long story before the question I just wanted to state how I came to the question.

Yes, absolutely. That is one of the problems with using serialization to save data. Fortunately the serialization tutorial mentions it and explains some strategies for minimizing the problem. So have a look at that tutorial.

UnsatisfiedLinkError and Java Virtual Machine error

Hi,
I'm trying load a library using the following lines:
static {
     System.loadLibrary("mtcokus.dll");
System.out.println("Random generator DLL loaded");
I'm getting the following error in the console:
java.lang.UnsatisfiedLinkError: no mtcokus.dll in java.library.path
     at java.lang.ClassLoader.loadLibrary(Unknown Source)
     at java.lang.Runtime.loadLibrary0(Unknown Source)
     at java.lang.System.loadLibrary(Unknown Source)
     at org.knowceans.util.CokusNative.<clinit>(CokusNative.java:34)
     at org.knowceans.lda.LdaEstimate.<clinit>(LdaEstimate.java:69)
Exception in thread "main"
Just before displaying the exception above, Java Virtual Machine Launcher DialogBox pops up and says:
Could not find the main class. Program will exit.
I checked the path of mtcokus.dll, it's where is must be. What can I do to fix this error?

{forum:id=210} is the correct forum for your question

Differences between Java Virtual Machine and Java HotSpot ??

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