A lot of JRE's installed...

Good morning...
here's something a bit wierd, but at least it doesn't involve pvc.
i installed sun's jre1.2.2 and ibm's jre1.2.2. then i installed netscape 6.1 with it's jre1.3.0.
now i have two plug-in control panels, 1 from sun and 1 from ibm and neither shows the same list of jre's. the netscape 1.3 jre doesn't show up anywhere. and there's a java.exe (which reports -version of 1.3.0_01) in my c:/winnt/system32 directory!
so anybody have any idea what would happen if i tried to run a java plug-in applet on my machine?

My current experience is that the LAST JRE you installed
is the one that will be in effect.
Note that unless you are careful, some JDK's auto install
their JRE as an assumption that you want it.
The solution? Uninstall all of them, and install the one
that will normally be downloaded by your HTML page.
Oh ya - when uninstalling - always delete any remaining directories and verify the Windows Registry has been properly cleaned out. Then, as always with Windows, make sure you reboot.
Also - have one machine that is not for development
and has never had IDE's or JRE's or their ilk ever installed.

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How to find out if JRE is installed on a Win32 system?

Hi,
does anyone know a good and reliable way to find out if JRE is installed on a Windows system? I want to start a JAR file but don't want to appear the "select program to start with"-chooser box when there's no JRE. Most unexperienced users give up at this point and delete my application. I'd rather let a popup-message appear that says something like "You need Java - download it here for free ...<link>".
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Thanks!!!

Try JSmooth ( http://jsmooth.sourceforge.net/ ). It's a Java executable wrapper.
From the website:
When the user clicks on the .exe, the windows application search the most suitable JVM installed on the computer to launch the java application. If no JVM is found, a dialog box is displayed to the users and they may be redirected to a web site (to www.java.com for example).
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How to Find whether JRE is installed in a system or not ?

I have to write an application in which I want my app to find whether jre is installed or not ?
Can any one help in this ? My E-Mail ID is
[email protected]
Kumanan.

For windows OS this is the solution.
Find out the following key in the registry.
HKEY_LOCALMACHINE/Software/javaSoft/Java Runtime Environment
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How to detect JRE is installed in Linux OS?

I detect the all JRE's installed in Windows OS by using REG QUERY.
but in Linux,how can i detect the JRE's.
i want to find the JRE version's and path, which are all installed in computer.
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You need to use Java to detect whether Java is installed?
Well, then here you go
public class IsJavaInstalled {
public static void main(String[] args) {
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How to find out jre version installed ,using a java program?

Hello,
Is there any way to find out the installed JRE version using a java program ?
The requirement is as follows:
There is a html page with 4 steps to install a software. each step is a link, which upon clicking does its work.
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Thanks in advance

For the hell of it... here is a list of properties you can query:
java.version Java Runtime Environment version
java.vendor Java Runtime Environment vendor
java.vendor.url Java vendor URL
java.home Java installation directory
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
java.specification.version Java Runtime Environment specification version
java.specification.vendor Java Runtime Environment specification vendor
java.specification.name Java Runtime Environment specification name
java.class.version Java class format version number
java.class.path Java class path
java.library.path List of paths to search when loading libraries
java.io.tmpdir Default temp file path
java.compiler Name of JIT compiler to use
java.ext.dirs Path of extension directory or directories
os.name Operating system name
os.arch Operating system architecture
os.version Operating system version
file.separator File separator ("/" on UNIX)
path.separator Path separator (":" on UNIX)
line.separator Line separator ("\n" on UNIX)
user.name User's account name
user.home User's home directory
user.dir User's current working directory

JAR files just won´t run, multiple systems, JRE & JDK installed.

Hi!
I´ve been looking on many different places for an answer for this issue:
I have to run different JAR files for applications, one is from Apache ActiveMQ, and the other is a hash calculating app. I´ve read on many topics that if you get error "Failed to load Main-Class" when running a JAR, the problem is how the JAR was packed (MANIFEST). Well, I find highly unlikely that two different JARs, from different sources, are wrongly packed. Also, I´ve installed JRE, JDK and even Java EE, on MS Server 2003 and on Windows 7 (on this last one only JRE), and no JAR runs. I´ve tried declaring PATH and JAVA_HOME environment variables... no use. Can anyone help me solve my problem?

Hi,
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Thanks!

Lot of troubles (impossible) installing Solaris 10 on VMware Workstation 6

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Hi Everyone,
I have just downloaded the Java Checker for Personal Java and am having big trouble installing it. Could someone please advise. This is what it says in the install file:
The JavaCheck installation file is a zip archive that contains a set of
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http://java.sun.com/products/personaljava/install_instructions.html

How to find all the jre's installed on desktop

I have installed JRE131, 142, 150 on my destop. How do I find out all these JRE versions using a Java Program or JavaScript?
Thanks in advance

Let me explain my question again.
We have "java applications" written to run with JRE 1.3.1, 1.4.2 and 1.5 (default JRE - higher version) etc, we are trying to access these applications using java web start. As we know that Java web start has an in-built capability to find required JRE installed on the remote PC(Using Native library). If the required JRE is not installed on remote PC, then the JNLP will make call to java.sun.com/autodl to download 1.2 version of JRE which we don't want that to happen(bcos of internal policy), rather we would like to determine whether or not this JRE is already exist on the remote client from the browser where the below JNLP is called to invoke the application. I do know that we dont have direct ability to check the JRE existence except default JRE(ie higher version among installed JREs, In here JRE 1.5 as mentioned above) using java/javascript. Take a look at the below applet code which would return only current jre version as if 1.3.1 and 1.4.2 are not installed although they exist. What I'm trying to do now is to populate a message on the IE browser itself to remote user saying that this 1.2 JRE is not installed, so please install it before calling below JNLP. So, How do I find out all the JREs installed on PC not just default JRE? I hope the question now is clear
Thanks thanks....
<?xml version="1.0" encoding="UTF-8"?>

<jnlp codebase="http://staff.develop.com/halloway/TechTips/May2001"
href="http://staff.develop.com/halloway/TechTips/May2001/Hello.jnlp">
<information>
<title>Hello</title>
<vendor>Tech Tips Sample May 2001</vendor>
<icon href="HelloJNLP.jpg"/>
</information>
<resources>
<j2se version="1.3"/>
<jar href="HelloJNLP.jar"/> --- This is the Java Application and will run on remote client using java web start
</resources>
<application-desc main-class="HelloJNLP"/>
</jnlp>
import java.applet.Applet;
import java.awt.Label;
public class Detect extends Applet
public Detect()
public void init()
add(new Label("Detection of the Java Plugin"));
public String getJavaVersion()
return System.getProperty("java.version");
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Problem with jre while installing 9iR2 on RedHat 2.1AS

When I try to install downloaded Oracle 9i Release 2 (9.2.0.1.0) on RedHat Advanced Server 2.1 I receive: Error in setting permissions of file/directory /opt/oracle/jre/1.3.1/bin/.java_wrapper. Please, help!

The internal bug description states that the software has been refreshed on OTN.
So downloading it again should solve the problem.
Alternatively for a version that's been previously loaded there is a file called oraparam.ini in a directory <stage folder>\Disk1\install\win32
replace the appropriate line as follows
JRE_SCRATCH_LOC=jrockit-jdk1.6.0_24/jre
the previous incorrect value was
JRE_SCRATCH_LOC=jrockit-jdk1.6.0_17/jre
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Installing JDK without administrator rights - JRE is installed

Hello,
On my PC the JRE is already installed. I want to install the JDK but have no administrator rights, and can't acquire them ;-)
Is there any way to do this? E.g by copying files....
Thanx
Pieter

Install the JDK on a machine where you do have admin privileges, then copy the JDK directory to this machine.
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Which JRE will JWS use if Multiple JREs are installed

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Sameer Jaffer

Hi,
it will run the latest JRE that is at least 1.4. If it finds a 1.6 it will even run this, because the version is higher than 1.4.
Bye Schippe

Lost lots of stuff by installing xfce4

Hi,
Just installed xfce4, and lots of stuff disappeared. It happened once, so I reinstalled, tried grabbing xfce4 again, but then it happened again. Lots of commands like ifconfig, dhcpcd, iwconfig, reboot +++ are missing. What the heck is this?
Just did a reboot, and now I can not connect to my network anymore (as ifconfig/dhcpcd is .. gone?)
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- edit -
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Last edited by loathsome (2008-04-27 22:38:50)

Same symptom here. My PATH becomes something like this:
/usr/gnu/bin:/usr/local/bin:/bin:/usr/bin:.
Notice the trailing "." That's not a typo, this has happened several times.
When happened to me for the for the first time three months ago, I thought it was due to bad sectors on the harddrive which I found when trying to track the cause of this problem.
Since then, I've gone through three computers and several more harddrives. Until I finally found this post
Yes, it could be fixed by renaming /etc/profile.pacsave to /etc/profile. Thank you elliott
This "bug" has cost me several days of work and I would like to learn from it... Does anyone know why the renaming takes place? Is there anything else that got messed up during the upgrade? (experiences?)
r|r
Last edited by raroman (2008-05-28 20:29:30)

Why Two JRE's Installed

When I installed j2sdk1.4.1 it installed one JRE
in C:\j2sdk1.4.1\jre an another one in
C:\Program Files\Java\j2re1.4.1. Why both?
When I use the "java" cmd at a cmd prompt window,
it seems to use the JRE at C:\Program Files\Java\j2re1.4.1.
What is the other one, at C:\j2sdk1.4.1\jre, used for?
Thanks in advance

Yes, they seem to be the same except the directory
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directory tree.
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A lot of JRE's installed...

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