JAVA_HOME, JRE and JDK

Does anyone know what JAVA_HOME should be pointing to if only the JRE in installed? What it should be pointing to if the JDK is installed?
On Windows, I notice that c:\program files\JavaSoft gets created after install. For which install does that happen? For the JRE and JDK install? Should JAVA_HOME be pointing to that directory?
I couldn't find any java.sun documentation about the role of the JAVA_HOME env var. If anyone can piont me to some, that would be appreciated. :-)
Version: 1.3.1
Thanks in advance.

Dear dinogg
Does anyone know what JAVA_HOME should be pointing to
if only the JRE in installed? What it should be
pointing to if the JDK is installed?
set JAVA_HOME=C:\jdk1.3.1\bin
On Windows, I notice that c:\program files\JavaSoft
gets created after install. For which install does
that happen? For the JRE and JDK install? Should
JAVA_HOME be pointing to that directory?
actually it is for jre but when u install jdk it also install jre if you notice there is a part setting up java runtime environment
I couldn't find any java.sun documentation about the
role of the JAVA_HOME env var. If anyone can piont me
to some, that would be appreciated. :-)
not sure where you can find it
Version: 1.3.1
Thanks in advance.
version 1.4.0 is out and it is nice
new stuff like scroll mouse, undecorated dialogs, xml transformer better focus management and etc
Thanks
Joey

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[Click Me|http://www.google.com/search?hl=en&q=difference+between+jdk+and+jre&btnG=Search]

What is the difference between JVM and JRE and JDK?

Hi , I want to know what actually is JVM,JRE and JDK ? and the difference between them?

They should at least try. When it comes to
terminology, if they can find this site, they should
be able to find google, wikipedia, etc. It's
reasonable to expect them to try there first, and
then, if they still have questions, post here,
indicating what they looked at and how it fell short,
what they're still confused about, etc.Perhaps this is a valid point.
I believe physical JVM hardware has also been
manufactured. I wonder what we'd call that? A JPM
(Java Pysical Machine)?No. It is simply a hardware implementation of the abstract Java Virtual Machine.
.class files are executed by software (in fact,the
software that executes the .class files is calledthe
JRE and is short for the Java
Runtime Environment). The JavaRuntime
Environment is a native program (i.e. it is run by
hardware) which provides the ability to executejava
bytecodes (.class files)That's the JVM.No it's not. The JVM is an abstract architecture.
The JRE is the JVM plus native libraries plus core
API Java classes.The JRE is an implementation of the JVM along with some additional facilities. The JVM may be used to describe concrete implementations in industry vernacular, but this is not a technically accurate usage of the term per the specification and is therefore incorrect.
From the preface to the Java Virtual Machine Specification, Second Edition, viewable at http://java.sun.com/docs/books/jvms/second_edition/html/Preface.doc.html:
"The Java virtual machine is an abstract machine."
From Wikipedia (http://en.wikipedia.org/wiki/JVM):
"A Java Virtual Machine (JVM) is a set of computer software programs and data structures which implements a specific virtual machine model."
Perhaps this misconception is the source of the confusion. This is one reason why I answered deepakorsun rather than refer him to somewhere else: anywhere that would be reliable and/or completely accurate would be too dense to readily understand, and anywhere understood easily enough might not be completely accurate.
>
The Java Development Kit (JDK) just provides the
facilities necessary to write programs that willrun
on the Java Virtual Machine. It contains acompiler
It also contains tools such as jar and javap, the API
docs for the core API classes, the source code for
the API classes, probably a few other things, and
generally the JRE (though I'm not sure if that's
officially a required part of the JDK).I never said it didn't contain jar, javap, javac, java, jdb, jconsole, or any of the other programs or resources shipped with jdk. I simply stated affirmatively something it did contain. As I implied before, technical comprehensiveness is exactly what makes resources such as the JVM specification almost unusable for answering questions like this. That is why I omitted such details in my description. And since we're being all technical here, the API documentation does not ship with the Java Development Kit (at least not as of JDK 5.0), it is a separate download. It is the core API source files that ship in a .zip file with the JDK.
Don't get me wrong, I do understand that you have probably seen a lot more people come and go from these forums than I may ever understand and that you have helped more people than you can remember, and I don't mean to disrespect that. I understand that dealing with so many people over such a long period of time and hearing the same questions over and over again can probably start to wear on your patience, but I don't think the right approach is to treat anyone that tries to help them with utter contempt and sarcasm. That's not constructive or useful to anyone. I understand why you would be upset if somebody was purposely trying to be lazy, I probably would be too, but you have no real way of determining whether or not they are being lazy or just don't know something and don't know how to figure it out for themselves so they are asking a question. And if they are honestly just asking a question in good faith and looking up the answer on Wikipedia just did not occur to them (or they couldn't understand what it said), yet they somehow ended up on this site, they have done nothing wrong and there is no reason to get angry at them.
Oh come on, that wasn't nice. Not everybody isable
to answer their own questions. WTF are you talking about?!? Why waste the time to
type something out when they can click on a link and
find 1000 times more information than you can fit
into one post? Either way - they're
STILL going to have to read the
information themselves...
Ridiculous.So I suppose you've either read the Java Virtual Machine Specification, the Java Language Specification, and the Java Native Interface Specification in their entireties, or absolutely nothing about programming in Java. This is because, by your reasoning, these three books contain 1000 times more than anyone can fit on a tutorial, Wikipedia entry, mailing list, forum, blog, or anything else.
Criticizing somebody who isn't doing something the exact way you think it should be done is often quite idiotic and non-constructive. I believe this is this case here. Please post something more useful, meaningful, and/or polite next time. And just for future reference, yelling at a beginner does not help them learn faster or better. It just makes them hate you.
Oh come on, that wasn't nice. Not everybody isable
to answer their own questions. Java terminologycan
be confusing and difficult to understand in part
because of all the acronyms used and all the name
changes undergone by the various development kitsand
platforms.Point taken. You have much more patience than
I, but with lots of intensive therapy and proper
adjustment of my medications, I may get better.Thank you for this post. A display of wisdom and patience. You single handedly caused me to reconsider participating in a flame war.

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I was wondering why when I download the JDK does it install a JRE and JDK. The JDK (I believe) includes all the JRE files as well as the compiler files. I can just as easily get rid of the JRE and as far as I know it wouldn't make a difference so why both?

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would make more sense
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To OP: This has been discussed by Sun, but no changes have been announced. Maybe the relocation in version 1.5 of the private (aka developer) code to the Program Folder is a start of this change?

JRE and JDK

Hi,
Dumb question from a java programmer working for 7+ years, but do I need both the JDK and the JRE? Obviously, a JRE is included in the JDK.
The JDK is 150 MB and the JDK is also 150 MB relatively, if I recall correctly.
This is 300 MB of Java, do I really need both or can I remove the JRE since the JDK installation has its own JRE?

The JDK installation installs its own JRE. You don't need a separate one installed. :)

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requirements..Well I just installed both the jdk and
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Hi all,
I want to download the JRE and JDK in one go and not download an installation program for each one. Ive searched everywhere but surely sun must provide these? Also does anyone know where i can get my hands on a downloadable version of the API docs?
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Please note that this applies to the currrent java version installed on "standard" windows systems, only.
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JRE vs JDK

Hi
I am doing this to find the version of JDK :
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java version "1.4.2"
I do this to find the version of JRE:
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I read on spots like this
http://www.novell.com/communities/node/5812/ways-access-oracle-application-linux-environment
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(I can only find JRE on the db end, since the jdk does not exist on $ORACLE_HOME in apps.

Thanks I will check those right now.
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Let me check those notes you posted
Thanks.

Differences of JDK x86 and JDK x64

Dear all,
I am in the progress on studying Java update with existing program.
For previous, the program is complied in eclipse under JDK 1.4.2.
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929805 wrote:
Is there documentation or reference (e.g. Java Knowledge Base, etc) stating this issue?There is documentation which states how Java compiled code must be handled within a JVM. (The Java Virtual Machine Specification.) Here's a quote from very close to the beginning:
The Java virtual machine is an abstract machine.So you shouldn't expect it to mention specific machine architectures, or to specify how it should work on any particular machine architecture. On the contrary, you should expect it to ignore the existence of different machine architectures. And likewise when it gets around to describing the class file format, it simply provides an abstract description. It's up to the implementers to write something which runs in a particular machine architecture and which faithfuylly implements the JVM specification.

JAVA_HOME and JDK

Hi,
I installed the Java SDK a while ago, how do I check that I have the JDK with it? The reason why I ask is because I want to set the JAVA_HOME variable and not sure where I must map it to? When I installed the SDK it installed everything under C:\Sun\SDK\. I am running Windows XP.
What are environmental variables used for? I am a C# developer and I am new to this Java setup.
Regards
Brendan

The compiler with the JDK is called javac and the JVM is invoked with java. You'll find both under the bin directory of your SDK installation.
The JAVA_HOME variable points to your JDK directoryso it'll be the path that you've given. The PATH variable should point to the bin directory under JAVA_HOME so that you can run javac and java and the CLASSPATH variable should be '.' unless you need to add anything else ( like Tomcat's servlet-api.jar).
This link[1] should help you out loads.
[1] http://ist.berkeley.edu/as/ag/technology/howto/install-java-sdk-win.html
Edited by: nogoodatcoding on Oct 20, 2007 10:39 PM

What is the difference between JRE,JVM and JDK?

plz reply me to the following question
(1)what is JRE,JVM and JDK?

The JRE is a java distribution for running java programs. It does not contain the development tools needed to compile and debug java programs.
The JDK is a java distribution for both running and developing java programs. In includes the deveopment tools.
The JVM is part of both the JDK and the JRE. It is the 'engine' that executes java bytecodes, performs garbage collection and does just-in-time compilation.
HTH

JAVA_HOME, JRE and JDK

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