Using System.getProperty()

What is the difference between using
java.version
java.specification.version
java.vm.version
java.vm.specification.version
The API's explanation of these keys and the ones similar like
java.vm.name.....don't really seem to provide a difference.
Can someone help?

This is documented under the getProperties() method in the JavaDoc for the System class:
http://java.sun.com/j2se/1.4.2/docs/api/java/lang/System.html#getProperties()
java.vm.specification.version     Java Virtual Machine specification version
java.vm.specification.vendor     Java Virtual Machine specification vendor
java.vm.specification.name     Java Virtual Machine specification name
java.vm.version     Java Virtual Machine implementation version
java.vm.vendor     Java Virtual Machine implementation vendor
java.vm.name     Java Virtual Machine implementation name

Similar Messages

[svn:bz-trunk] 20505: Bug: Watson #2818669 - AbstractAmfInput uses System. getProperty in Constructor leading to AccessControlException when using in Applet

Revision: 20505
Revision: 20505
Author:   [email protected]
Date:     2011-03-01 07:31:55 -0800 (Tue, 01 Mar 2011)
Log Message:
Bug: Watson #2818669 - AbstractAmfInput uses System.getProperty in Constructor leading to AccessControlException when using in Applet
QA: Yes
Doc: No
Checkintests: Didn't run - the change was to wrap the System.getProperty in a try/catch that would have caused the SecurityException, so no real functionality change that could affect the check-in tests.
Modified Paths:
    blazeds/trunk/modules/core/src/flex/messaging/io/amf/AbstractAmfInput.java

Getting cell id in java me using System.getProperty

Hi all
I wish to get the cell id of the cell (I know it had been asked for more than a million times) that my nokia phone is currently connected to with the api listed here
[http://wiki.forum.nokia.com/index.php/CS000947_-_Getting_Cell_ID_in_Java_ME|http://wiki.forum.nokia.com/index.php/CS000947_-_Getting_Cell_ID_in_Java_ME]
As stated,
System.getProperty("com.nokia.mid.cellid") works on S60 3rd Ed
System.getProperty("Cell-ID") works on S40 3rd Ed
However, I am unable to do so on N82, anyone have any idea why is that so?
Or is there any kind soul with N95 can tell me whether it works on N95?

yes.. I saw that thread before I posted this.. but the piece of code mentioned in the thread does not make use of the api listed in the wiki right?
In fact, I'm not very clear as to what that mentioned code is doing.
Moreover, my point would be, how come the api is listed in the wiki in that case.. that is, if it does not work.. :/

Using System.getProperty in the app, but still not signing the jar file

Is there a way to use the System.getProperty call in the app but not sign the jar? I get the security exception when launched using WebStart?
Any help appreciated.

Yes. Don't use Web Start, and you'll have no problems.
Seriously, the security exception is there by design. If you must call System.getProperty, you need to sign your jars -- though personally, I think there are situations where signing your jars to make Web Start work is a needless complication.
However, if you still need a tool to deploy updates and such, I recommend Deploy Director from Sitraka.

Where does user.name come from when using System.getProperty(user.name)

Hello,
Based on the user's requirements, I implemented authentication based on the results of the System.getProperty(user.name) feature. The audit group has some concerns on where the user.name value is coming from.
Does anyone have any idea where this property is coming from, and if it is coming from a file, whether it is stored as text.

Environment variable that is read internally by the JRE. If you go to dos (in windows) and type "set" and hit return, you'll see Username=whatever your login name is. If course, someone with the right credentials can change this.
Unix has a similar feature.

Using System.getProperty("myVar")

How do I pass in the System property within Eclipse to get the above statement to pick it up? I've always used java myApp -dmyVar=someValue from the cmd line.
I know you add it as an arg to the JVM but what menu/dropdown/option do I use within the IDE
Thnx

you have to click RUN and in the scren that appers you have a tab
Arguments here you can give both program arguments and vm arguments
you have to choose Run and not Run As

System.getproperty("Var Name") gives null in RedHatLinux5

Please provide some solution for this strange problem. I am able to get the system property value from terminal but when I use System.getproperty() I am getting null.
Ex:
echo $client
ans: /home/naveen/client/classes
from java program
System.getproperty("client"); it gives null

use getenv(), instead of getProperty()

System.getProperty("user.home") is giving diferent results on diff versions

I am working on windows 2000. When I try to get user.home using System.getProperty it gives me c:\documents and settings\my name.
But the same things when tried on a windows 2003 server tries to look in c:documents and settings\default directory. Why is this?
Please help.....

In XP, the environment variable USERPROFILE is set to C:\Documents and Settings\<username>, and that value is picked up for user.home. Since the "user's home directory" varies by os, there will be variations. 98 is different than Linux than XP, etc.

Using system properties in config file.

HI,
Does anybody know how we can declare System properties in OC4J.
I am talking about using System.getProperty() in java classes.
I need to use this to capture my context realtive path in log4j properties file.

JavaSiva,
If you are using OC4J stand-alone, there are two ways (I know of) to define "System" properties:
* Use "-D" option of "java" command when launching OC4J
* Use "-p" switch recognized by "oc4j.jar" when launching OC4J
Note that I haven't tried OC4J stand-alone developer's preview 10.1.3.1.0 so I don't know if the above is still correct for that version, but it is for every version prior to that one.
Good Luck,
Avi.

Is there a System.getProperty("user.desktop")

I am trying to get the path of a user's desktop, regardless of OS.
I know that I can use
System.getProperty("user.home")to get the current user's directory, but what about the current user's desktop? is there a call for that?
if not, i know where the windows desktop folder is located, but I am unfamiliar with Mac, Linux, other Unix OSs...could anyone please share where their desktops are from the root dir?
thanks.

Two suggestions so far for Linux:
* /usr/local/foo
* user.home
The first will probably only be writable if your installer* is being run by root / superuser. I'd say that the expected behaviour would be to extract to pwd - i.e. user.dir. However, as already stated I'd quite like to be given the choice first if it's a GUI installer. A console installer which extracts to pwd would seem quite reasonable.
Of course, you could take the view that most Linux users are used to getting a .tgz which they then extract whereever they want, so if your jar contains the file it extracts it's probably sufficient to put a README.txt in it and prompt the Linux user to read it.
Under OS X people will probably expect you to use the built-in installer. You might be able to build a suitable package without an OS X box - check Apple's website for documentation. The desktop is ~/Desktop (where ~ is user.home).
* If it's not an installer, although you seem implicitly to have agreed it is, I'd extract to /tmp/fooRND, making sure that it didn't exist and generating a new RND if it did.

System.getProperty doesnot work

Hi,
I have a piece of code where I try to get a env variable VTNAME in my java application. Code snippet below
     //this function creates a session.
     public void setSession(configParams params) throws Exception {
          boolean done = false;
          int retryCount = 0;
          mVTName = params.getFactoryName();
          System.out.println(System.getProperty("VTNAME"));
It returns me null. And when i do
:/home/santsat > echo $VTNAME
dbusd1.srv.uk.deuba.com:8092/tcp:
Any thoughts o what is wrong in the code?
Thanks
Message was edited by:
chabhi

Java's system property is not the same as environment variable.
To get environment variable, use System.getenv().
If you start your java app with -DVTNAME= then you can use System.getProperty().
Budyanto

System.getProperty with foreign language

Hello All,
I've developed a program that uses System.getProperty("user.home"), in order to transfer files to that location.
Everything's going well as long as I'm using English version.
When one of my customers ran this using a foreign language (Turkish, but it seems to have the same effect on other languages), instead of c:\documents and settings\administrator, he got a wrong fonetic path, i.e. C:\DOCUMENTS AND SETTÝNGS\ADMÝNÝSTRATOR (check the I's, they're not the same), although he has the English path in his computer.
You can see this also when you change the regional settings in an English based Windows to Turkish.
How can I make the System property look at the correct path (again, this happens in other languages as well)?
Thanks,
Barak

Hmmm.... I didn't think I used toUpperCase in my code. When all else fails, my advice is to read the API...
[http://java.sun.com/javase/6/docs/api/java/lang/String.html#toUpperCase()]
<quote>
Note: This method is locale sensitive, and may produce unexpected results if used for strings that are intended to be interpreted locale independently. Examples are programming language identifiers, protocol keys, and HTML tags. For instance, "title".toUpperCase() in a Turkish locale returns "T?TLE", where '?' is the LATIN CAPITAL LETTER I WITH DOT ABOVE character. To obtain correct results for locale insensitive strings, use toUpperCase(Locale.ENGLISH).
</quote>

SCJP System.getProperty()

I am having problem with a scjp question:
public class vv{
     public static void main(String[] args){
          String myProp = System.getProperty("prop.custom");
          System.out.println(myProp);
suppose it can complie if I use:
System.getProperty("prop.custom");
but there is java.lang.ClassNotFoundException: prop.custom=gobstopper
What's wrong?

Welcome to the Sun forums.
crunchor wrote:
..but there is java.lang.ClassNotFoundException: prop.custom=gobstopperHuhh?
public class vv{
     public static void main(String[] args){
          String myProp = System.getProperty("prop.custom");
          System.out.println(myProp);
andrew@pc1:/media/disk/proj$ javac vv.java
andrew@pc1:/media/disk/proj$ java vv
null
andrew@pc1:/media/disk/proj$
What's wrong?Which brings me back to - huhh?
BTW - Please use code tags when posting code, code snippets, HTML/XML or input/output. The code tags protect the indentation and formatting of the sample. To use the code tags, select (highlight) the sample and click the CODE button.

Problem with System.getProperty( "com.stc.application.dataroot" ) in JCAPS6

Hello everybody,
I'm using JCAPS 6 but I have to follow a guideline of projects implemented with JCAPS 5.1.3.
The project for example, has written for the logs-directory in method user initialize this code:
// JCAPS uses JVM version 1.5
logger.info( "--- BEGIN ------ JCAPS userInitialize" );
String currRoot = System.getProperty( "com.stc.application.dataroot" );
String log4j_props = currRoot + "/../../NameDirectory/" + collabContext.getProjectPath() + "/" +
collabContext.getCollaborationName() + "_log4j.properties";
With JCAPS 6 I don't know how to substitute "System.getProperty( "com.stc.application.dataroot" );" because with it don't function.
Somebody can help me?
Thanx!
Fabrizio

This is the correct code:
// JCAPS uses JVM version 1.5
logger.info( "--- BEGIN ------ JCAPS userInitialize" );
String currRoot = System.getProperty( "com.stc.application.dataroot" );
String log4j_props = currRoot + "/../../NoemaLife/" + collabContext.getProjectPath() + "/" + collabContext.getCollaborationName() + "_log4j.properties";
but I have the same problem...

System.getProperty("user.name") not working without /etc/passwd, CentOS 4.3

Dear all,
I'm having trouble getting the system property user.name (which we need in our ant scripts) on our CentOS box. :(
When running the program below thru
java dumpproperties2
it prints "user.name='?'" on our CentOS 4.3. On win32 it works. It turns out that if you add the account corresponding to the EUID to /etc/passwd it works correctly. However, we don't use passwd authentication but an enterprise wide LDAP-system. Our /etc/nsswitch.conf says:
passwd: files ldap
One work around is to replace the java executable with a script that does
/path/to/jdk/bin/java -Duser.name=$USER -Duser.home=$HOME $@
Used jdk is j2se 1.5.0_13 Linux 32-bit.
Some questions for the experts:
1) Is there any other way?
2) Is it a known issue that Linux versions of the jdk just looks in /etc/passwd to map uid to user name (and home dir) instead of doing what the rest of the system, like whoami, does? I haven't found anything in either the readme or installation instructions, nor in the bug db.
Br, Jesper Tr�g�rdh
public class dumpproperties2 {
    public static void main(String[] args) {
     String s = System.getProperty("user.name");
     System.out.println("user.name='" + s + "'");
}

Does this work?
//public final class System
public static String getenv(String name)Then you can access the USER environment from inside Java.

Using System.getProperty()

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