Running multiple JREs in browsers

Hi,
I have two JREs installed on my Windows 2000 machine (JRE 1.3.x and JRE 1.4.x). There are several Java applets running in a web browser but some of them need to have a specific JRE version and don't run with another. So my question is: can I use both JREs within the same browser (Mozilla 1.5) or can I somehow configure the browsers so that e.g. IE runs with JRE 1.3.x and Mozilla with JRE 1.4.x?
Thanks a lot for any help... Robert

This may help you. I have the same issue at work. We have one program that requires a different version of JRE than other programs. The way I get around this is a little inconvenient but works. In Internet Options Advanced tab, uncheck "use Java 2 v1.4.2.03 for <applet> (requires restart)" and the program requiring the older version should run fine. (It does for us). The inconvenience comes with rechecking the box to run the newer program. I'm still trying to find a better fix. Just thought this might help in the mean time.

Similar Messages

Issues when running multiple apps on same JRE?

I've created an application that launches other Java applications, all running on the same JRE. I've noticed that this results in significant memory savings (60% or more). Performance doesn't seem to be measurably affected, but I've never run more than 4 applications at the same time on the same JRE.
Does anyone know of any performance issues in situations like this? JRE limitations? Any information would be appreciated.

"It's just not obvious from the 1.3 API docs that the classLoader is what's responsible for associating a set of classes with a set of threads."
No, that's not what I was implying. The default classloader caches the definition of previously loaded classes (ie, bytecode, static variables). By default, there is no way to unload a class. Static variables will also retain their values -- which could confuse an application that is run multiple times.
This is the suggested implementation defined in the JVM spec:
http://java.sun.com/docs/books/vmspec/html/ConstantPool.doc.html
Basically, if a class has already been loaded, it returns it. You can write your own custom classload to prevent this (as the link you found suggests) or use multiple classloaders.
Imagine what happens when you write an application and then recompile a class WHILE running your application. Will the next instance of that class be updated? The answer depends on whether your classloader will reload the class from disk, or use a cached instance in memory (as the default one does).

Multiple JREs installed - how to select correct one?

Hi all
I have multiple JREs installed on my computer, which I need to keep.
I'm doing some development, and when I try to run the class, I get the following error:
Exception in thread "main" java.lang.UnsupportedClassVersionError: HelloWorldApp
(Unsupported major.minor version 50.0)
        at java.lang.ClassLoader.defineClass0(Native Method)
        at java.lang.ClassLoader.defineClass(Unknown Source)
        at java.security.SecureClassLoader.defineClass(Unknown Source)
        at java.net.URLClassLoader.defineClass(Unknown Source)
        at java.net.URLClassLoader.access$100(Unknown Source)
        at java.net.URLClassLoader$1.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClassInternal(Unknown Source)java -version shows:
java version "1.3.1_01"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.1_01)
Java HotSpot(TM) Client VM (build 1.3.1_01, mixed mode)The reason I'm getting this error is because Eclipse is using the following JRE:
C:\Program Files\Java\jre6\bin>java -version
java version "1.6.0_17"
Java(TM) SE Runtime Environment (build 1.6.0_17-b04)
Java HotSpot(TM) Client VM (build 14.3-b01, mixed mode, sharing)My Path environment variable is:
C:\Program Files\Java\jre6;C:\oracle\ora92\bin;C:\Program Files\Oracle\jre\1.3.1\bin;C:\Program Files\Oracle\jre\1.1.8\bin;%SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\Wbem;C:\Program Files\Intel\DMIX;C:\Program Files\Gemalto\GACMy CLASSPATH environment variable is:
C:\Program Files\Java\jre6;C:\Program Files\gemalto\gac\GATicket.jar;How do I force my Windows XP system to use the latest JRE installed?
Thanks

Thanks again.
However, it appears the PATH variable may be a red herring.
If I set the class path to exclude the jre6 directory, as follows:
C:\oracle\ora92\bin;C:\Program Files\Oracle\jre\1.3.1\bin;C:\Program Files\Oracle\jre\1.1.8\bin;%SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\Wbem;C:\Program Files\Intel\DMIX;C:\Program Files\Gemalto\GACThen the following error occurs:
C:\Documents and Settings\Me\workspace\RegexTestProject\bin\regextest>java -
version
java version "1.3.1_01"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.1_01)
Java HotSpot(TM) Client VM (build 1.3.1_01, mixed mode)
C:\Documents and Settings\Me\workspace\RegexTestProject\bin\regextest>dir
Volume in drive C has no label.
Volume Serial Number is 2806-C30D
Directory of C:\Documents and Settings\Me\workspace\RegexTestProject\bin\re
gextest
03/09/2010 13:55    <DIR>          .
03/09/2010 13:55    <DIR>          ..
03/09/2010 13:56             1,707 RegexTestHarness.class
               1 File(s)          1,707 bytes
               2 Dir(s) 11,257,622,528 bytes free
C:\Documents and Settings\Me\workspace\RegexTestProject\bin\regextest>java R
egexTestHarness
Exception in thread "main" java.lang.UnsupportedClassVersionError: RegexTestHarn
ess (Unsupported major.minor version 50.0)
        at java.lang.ClassLoader.defineClass0(Native Method)
        at java.lang.ClassLoader.defineClass(Unknown Source)
        at java.security.SecureClassLoader.defineClass(Unknown Source)
        at java.net.URLClassLoader.defineClass(Unknown Source)
        at java.net.URLClassLoader.access$100(Unknown Source)
        at java.net.URLClassLoader$1.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClassInternal(Unknown Source)This is expected as the class was compiled using a later version of the JDK.
However, if I update the PATH, and add the JRE6 entry to the path as follows:
C:\Program Files\Java\jre6\bin;C:\oracle\ora92\bin;C:\Program Files\Oracle\jre\1.3.1\bin;C:\Program Files\Oracle\jre\1.1.8\bin;%SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\Wbem;C:\Program Files\Intel\DMIX;C:\Program Files\Gemalto\GACI then get a class not found exception!!??
C:\Documents and Settings\Me\workspace\RegexTestProject\bin\regextest>java -
version
java version "1.6.0_17"
Java(TM) SE Runtime Environment (build 1.6.0_17-b04)
Java HotSpot(TM) Client VM (build 14.3-b01, mixed mode, sharing)
C:\Documents and Settings\Me\workspace\RegexTestProject\bin\regextest>dir
Volume in drive C has no label.
Volume Serial Number is 2806-C30D
Directory of C:\Documents and Settings\Me\workspace\RegexTestProject\bin\re
gextest
03/09/2010 13:55    <DIR>          .
03/09/2010 13:55    <DIR>          ..
03/09/2010 13:56             1,707 RegexTestHarness.class
               1 File(s)          1,707 bytes
               2 Dir(s) 11,257,618,432 bytes free
C:\Documents and Settings\Me\workspace\RegexTestProject\bin\regextest>java R
egexTestHarness
Exception in thread "main" java.lang.NoClassDefFoundError: RegexTestHarness (wro
ng name: regextest/RegexTestHarness)
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(Unknown Source)
        at java.security.SecureClassLoader.defineClass(Unknown Source)
        at java.net.URLClassLoader.defineClass(Unknown Source)
        at java.net.URLClassLoader.access$000(Unknown Source)
        at java.net.URLClassLoader$1.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClassInternal(Unknown Source)
Could not find the main class: RegexTestHarness. Program will exit.Below is the code of the class:
package regextest;
import java.io.Console;
import java.util.regex.Pattern;
import java.util.regex.Matcher;
public class RegexTestHarness {
    public static void main(String[] args){
        Console console = System.console();
        if (console == null) {
            System.err.println("No console.");
            System.exit(1);
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            Pattern pattern =
            Pattern.compile(console.readLine("%nEnter your regex: "));
            Matcher matcher =
            pattern.matcher(console.readLine("Enter input string to search: "));
            boolean found = false;
            while (matcher.find()) {
                console.format("I found the text \"%s\" starting at " +
                   "index %d and ending at index %d.%n",
                    matcher.group(), matcher.start(), matcher.end());
                found = true;
            if(!found){
                console.format("No match found.%n");
}Based on the above, I think the path is set correctly, but I'm doing something else wrong.
Thanks for you help so far. :-)

XI Client Installation with Multiple JREs

I'm wondering if it is possible to have multiple JREs greater than 1.4 installed and still use the XI client for IB/IR. I have configured JWS to only use the 1.4.2 version I have installed, but it still tries to startup on Java 6.
Thanks in advance.
Peter
Sorry for the simple question, but I haven't been successful in getting this to work.

One "simple" way of doing this is to manually start Java Web Start 1.4 and run IR and ID directly from there.
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Regards,
Henrique.

Multiple JRE Versions on Same App Server

Hello All,
I have a questions in regards to installing multiple JRE's on the same SAP Application Server.
Background:
We currently have an SAP HCM ABAP-only application which will be sitting on a Windows Server 2008 box w/SQL Server backend. The current JRE is 1.4.2 as recommended by SAP for sapinst. What we are trying to achieve is to install the standalone JCo client 3.0 (Java connector) which will be required for a Novell IDM integration (as the HCM is ABAP only - we require JCo standalone client to properly interface). JCo 3.0 requires JRE 5 or 6 as per SAP (we want to install 6).
So.... to my original questions:
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2) I am also wondering if it is OK to do this, and simply update the variable path back to the 1.4.2 JRE in cases where we need to run sapinst (refreshes, etc)?
Any insight will be greatly appreciated! Thank you!
Tyler

Hi Tyler,
In my opinion, you could go ahead with first option - have multiple JRE's and maintain the environment variables accordingly.
This should not be a problem as the envrionment variable would take care of which JRE is used. Also as you have only another ABAP system on the same server, the other older JRE would only be required during the SAPInst operations. Non-existence of a Java system makes things simpler here
Regards,
Srikishan

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Oops; sorry about the false alarm. :)
(Was hoping to retract the question, but it looks like others have a similar problem.)

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Having trouble running multiple instances of Firefox in XenDesktop 7.1

We recently upgraded our Citrix environment to XenDesktop 7.1. We published Firefox, but only one user at a time can have the program open. When we try to run multiple sessions, we get this error message "Firefox is already running, but is not responding. To open a new window, you must first close the existing Firefox process, or restart your system."
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I do not understand virtualisation.
I can however say that ordinarily Firefox needs each user to have a separate profile and for Firefox to open simultaneous multiple instances with separate profiles the ''-no-remote'' argument needs to be used.
* http://kb.mozillazine.org/Using_multiple_profiles_-_Firefox
* http://kb.mozillazine.org/Opening_a_new_instance_of_your_Mozilla_application_with_another_profile

PowerShell using start job to run multiple code blocks at the same time

I will be working with many 1000’s of names in a list preforming multiple function on each name for test labs.
I notice when it is running the functions on each name I am using almost no CPU or memory. That led me to research can I run multiple threads at once in a PowerShell program. That lead me to articles suggesting start-job would do just want I am looking
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Lishron

You say your testing shows that you are using very little cpu or memory in processing each name, which suggests that processing a single name is a relatively trivial task.
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[string](0..33|%{[char][int](46+("686552495351636652556262185355647068516270555358646562655775 0645570").substring(($_*2),2))})-replace " "

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Hi there, (V12 with ERP/ECC transactions)
We are setting up our landscapes/environments for development, beta testing, final QA and production. I am wondering if we can combine development and beta testing on the same system.
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Thanks,
--Amy Smith
--Haworth

Thanks Jeremy,
Thanks for the suggestion Jeremy.
Our server is not capable of another instance. It is not easy to get our SAP Basis people to install and configure a new system and we are not allowed to do it ourselves. I was trying to find a way to use our existing instance of NetWeaver/MII to run multiple copies of the application. In J2EE apps I have worked on, it is as simple as copying the software, changing the URL, changing the application config files for the data source and deploying the new duplicate app under a different name.
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--Amy Smith
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How to use multiple JREs (1.5.0_20 and 1.6.0_07) with Internet Explorer 8?

Hi!
Question about the problem mentioned in subject.
I have configured that JNLP opens with 1.5 version, both versions are enabled in Java Control Panel Runtime Settings but when I try to start a desktop java console says:
Java Web Start 1.5.0_22
Using JRE version 1.6.0_07 Java HotSpot(TM) Client VM
And the opening of the desktop creates an exception:
Java Web Start - Invalid Argument Error
TooManyArgumentsException[ Too many arguments supplied: {C:\WINDOWS\Temporary, Internet, Files\Content.IE5\....
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Br,
Katri
Edited by: ka**** on 09-Mar-2011 01:16
Edited by: ka**** on 09-Mar-2011 03:16

ka**** wrote:
..Question about the problem mentioned in subject.No "Using multiple JREs (1.5.0_20 and 1.6.0_07) with Internet Explorer 8" is a statement. To transform it to a question would be something like "How to use multiple JREs (1.5.0_20 and 1.6.0_07) with Internet Explorer 8?".
Once you can come up with an actual question, I might look at this more closely.

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appears that only one version of photoshop can run at a time.

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Roger ---|-

Dev/Test:
Give each one its own domain name - i.e. a separate directory under config. This
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Production:
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simon.
Roger Cornejo wrote:
I need to run multiple instances of BEA WLS on a unix machine. I need4 separate instances (dev and test for two different departments) on
one machine and two production instances on another machine. What is
the best way to go about separating these (ex. an account or directory
structure for each)?
Thanks,
Roger ---|-

Can you run multiple ATV's?

Are there any issues with running multiple ATV's at the same time- playing different content? Also, are you able to broadcast the same content (say from itunes on my Mac) to all ATV's at once (I can see this used at parties where I can have all the TV's on displaying the same video/photo reel). I am hoping there are some freaks like me out there who are planning/have already populated all their TV's with ATV's.
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I have to ATVs setup and it is actually quite amazing how you can play different content on each of them from the same library... wicked. I cannot attest to streaming video since 4.2 is still in beta and iTunes from the desktop is not streaming video to ATV, but audio works great. Apple is really onto something here...

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I have been struggling with this one for a while now, hopefully someone can help me understand what I am missing...
I have a single SharePoint Farm. This farm runs multiple Web Applications & the Service Applications.
1. SharePoint Only Server with Multiple Site Collections (http://sharepoint.com/...)
2. MS Project Server with Multiple Site Collections (http://pwa.com/...)
3. My services applications all exist on the same farm.
I was under the impression, and believe that I validated this through testing and from this site (http://blogs.office.com/2009/11/16/excel-services-in-sharepoint-2010-administration-improvements),
that you can only run a single Excel Services Application against each unique Web Application. In essence, I can run one Excel Services Application against the SharePoint Only Server, and another Excel Services Application against the MS Project
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ie. I can NOT do the following: ExcelServiceApp1 for
http://pwa.com/SiteA & ExcelServiceApp2 for
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Is that correct?
If that is not correct, then I must be missing a way to specify a different Excel Service App for each Project Web App Site.
Some other solutions that I think may work, but would really appreciate if someone could validate:
- Create multiple Project Server Service Applications for each instance of PWA/Excel Service? (but wouldn't this still have to use one of the two WebApplications and cause the same limitation?)
- Create a new Web Applciation for each PWA/Excel Service? (ie.
http://pwasite1.com;
http://pwasite2.com; http://pwasite3.com, etc.)
Thoughts/suggestions are very greatly appreciated!!!

Hello Trpy2k
I have not done what you are doing and I assume that you are using project server 2010. However, you answer lives in PowerShell.
The New-WebServiceProxy show that you can create a new proxy by spacing a URL and not a web application. The default proxy from the web application is directing to the default excel service. If you need another excel service, you must specify another
proxy and this may do it for you.
Also, don't forget the Secure State service and that each excel report will need this configured, that is with the assumption that the other excel service requires different authentication.
PS. This question may get a better answer in the SharePoint forums.
Cheers!
Michael Wharton, MVP, MBA, PMP, MCT, MCTS, MCSD, MCSE+I, MCDBA
Website http://www.WhartonComputer.com
Blog http://MyProjectExpert.com contains my field notes and SQL queries

Running multiple JREs in browsers

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