JRE 1.3 and multiprocessors

Does anybody know whether JRE 1.3 is able to work well in a multi-processor computer with Unix OS
if so, how to implement this ? which parameters does one have to initilize in the JVM so it would work?
if not, how does it work with JVM 1.4 if at all

I don't know what you mean by "works well"; Java (1.3, 1.4 and 1.5) can use multiple processors. Whether that occurs is dependent on the cpu/computer configuration, the os and its configuration, and whether the Java programs have been architected and coded to use multiple processors.
A single instance of a single-threaded Java program will not use multiple processors.
Sun has good information on this, see their documents.

Similar Messages

64bit and multiprocessor / dual core

(This message was already posted in te JRE forum where it may have been at the wrong place.)
Hello
I'm investigating on Java2SE 64Bit and multiprocesssor support but I didn't find explicit and recent articles. I'm explicitely interested to know what gain in performance I could expect for Java.
Does anybody can give me a link to articles treating those subjects? I'm interested in the following topics:
- Current support of Java for 64bit and multiprocessor
- How to benefit from 64bit/multiprocessor enhancements in Java
- Restrictions
Thank you in advance for anly link
Yves

Depends on which jvm's there are that support 64 bit processors. I only have experience with a jvm for AIX (IBM) 64 bit OS. I saw the following advantages and disappointments:
* Could allocate 3.4 GB instead of just 1.6-1.8 GB - but I had expected more than that.
* Saw no performance gain in our applications.
I have used multiprocessors for a Red Hat Linux installation. Our application in Java nearly doubled the speed of it's execution - there didn't seem to be any strange bottlenecks, but the processors could be fully used.
Gil

JRE 1.3 and JRE 1.4 on same machine

I have JRE running on windows NT. currently I have 2 applets one that works with JRE 1.4 and one with JRE 1.3,
How to set up the JRE to support both applications in the same time?

You can run your HTML code containing the embedded applet through a tool developed by Sun (and free for download) called an HTML converter. Then your clients will be expected to have (and download if they don't have it) a plug-in for a particular version of the JRE. The point is you are telling your applet to run with a specific JRE, not the browser default (whatever that may be for the different people accessing your page).

I need some information about jre 1.5 and jre 1.6.

Hello guys,
I need some information about jre 1.5 and jre 1.6.
Suppose if i have jre 1.5 customized with "additional language support" installed in my my desktop, and later on i install jre 1.6. will this jre over write all the esisting settings which was present in jre 1.5?
In short will the version upgrades disable the features of the old Version even though the old version is present in the desktop?
Thanks in advance for your answers.

In <2j_j3.1889$[email protected]> =?iso-8859-1?B?VG9t4XMgU3XhcmV6?= writes:
> Hi all, I am developing an acquisition data system for biomedical
>signals and I need to transmit this data from my hardware to PC using the
>USB port. For this, I am writing a device driver for Windows 98
^^^^^^ ^^^^^^ ^^^^^^^ ^^
That's not a trivial step. I would write a small C/C++ program that
exercises your driver (for robustness) just to be sure it's working
right first without crashing your system.
>The problem is that I don't know to use this driver in LabView.
>For now, I think to use a "code interface node" with code writen in C or a
>"call library function" with a DLL.
That's correct. _After_ you got your C/C
++ test program (and USB
driver) above working, then you can convert this little test program
into a DLL or CIN, which can interface with LabView. A DLL might be
easier (slightly) to write, but the CIN will work faster with LabView
and can be designed to be reentrant. The Code Interface Reference
Manual should guide you. Remember, this is a task for an _experienced_
C programmer. You'll need to use handles to pointers into all your
dynamic arrays and such passed into LabView.
After you got your CIN or DLL written, you can use a special CIN
function node to "link" (or bind) your CIN object into LabView's VI
diagram.
SOME THOUGHTS:
There are many hardware devices already on the market today that come
with Windows 98 drivers and DLL (or even CIN) libraries that would work
immediately with LabView. Why don't you save yourself three months of
work and simply buy one of these?
/\ Mark M Mehl, alias Superticker (Supertickler to some)
<><> Internet: [email protected]
\/ Preferred
UUCP: uunet!iastate.edu!mehl
Disclaimer: You got to be kidding; who would want to claim anything I said?

Difference between, jre, jdk, sdk and j2se

Dear Sir/Madam,
I want to do some java and j2ee development and run these applications in a java application server environment. Can anyone give me some advices on what should i need to download? Moreover, what is the difference between, jre, jdk, sdk and j2se? Should i need to download all of jre, jdk, sdk and j2se?
thanks and regards,
david

JRE is the 'java runtime environment'. It is responsible for creating a Java Virtual Machine to execute Java class files (e.g., run Java programs)
JDK is the 'java development kit'. It is the same as the 'SDK' (at least in my mind). It normally comes bundled with a JRE and also allows you to compile Java source files into Java class files. The JDK allows you to both write and run programs.
J2SE is "Java 2 Standard Edition". It can refer to either a JDK or JRE. This is 'core' Java. There is also J2EE "Java 2 Enterprise Edition" which allows you to write middleware or server code more easily.
Your final choice will be which version. If you want the current, most common implementation:
J2SE 1.4.2, J2EE 1.3
If you want to skip ahead to the next generation, the latest releases would be:
J2SE 1.5 (also called J2SE 5.0) and J2EE 1.4
- Saish

Any know issues for JRE 1.6 and BOXI 3.1

Any know issues for JRE 1.6 and BOXI 3.1

Our most stable JRE with which we've had best results has been JRE_1.6.0_07
Hope this helps.

How to make jre 1.3 and 1.4 co-exist

Hi,
I have an applet that I have tested and know runs fine under 1.3.1_01 to 1.3.1_04.
I have tested it with 1.4.0_01 and know that it doesn't work.
Right now, rather than look into why it doesnt work in 1.4 I'm interested in just making it work at all times, using 1.3.
So there are several problems here, one to make 1.3 and 1.4 co-exist.
I would like to tell IE ( I use 5.5 but it should also work with 6.0 ) that I dont want to use 1.4 but 1.3. The only way I have made this work is to install 1.3 after 1.4 or it won't. Regardless of how many times I turn off 1.4 from the contolpanel plugin console, and turn on 1.3 the same way, it still runs 1.4 if its installed after. (I restart IE it's not that.)
I guess this is not just a matter of choosing the default plugin, but it depends also on the applet tag. Furthermore I would like the applet tag to say run this only with 1.3. I also would like it to install 1.3 if and ONLY if 1.3 is not installed. I have many times got the install pop-up even though I know I have the right version installed.
My applet tag looks like this (its actually an object tag, becuase as I understand, that's the way to tell it run only the version I want) Whats wrong with it?
<object
     id="treeApplet"
     classid="clsid:8AD9C840-044E-11D1-B3E9-00805F499D93"
     width="100%"
     height="80%"
     border="0"
     codebase="http://java.sun.com/products/plugin/1.3/jinstall-13-win32.cab#Version=1,3,1,4"
>
<param name="code" value="applet/TreeApplet.class">
<param name="codebase" value="/tree/">
<PARAM NAME="type" VALUE="application/x-java-applet;version=1.3">
<param name=... >
</object>
the class id is the dynamic, where do I find the static ones?
Is the .cab file pointing to the right jre or is it giving me trouble? What is the url of right .exe files to use instead? will that work better?
ok, so to summarize, how do I make all I want to work? co-existence (shouldnt it work to go back and forth between the jre versions?), running the right version, and intalling when and only when needed.
thanks

First, CLSID's:
8AD9C840-044E-11D1-B3E9-00805F499D93 --> dynamic
CAFEEFAC-0013-0001-0001-ABCDEFFEDCBA --> static, 1.3.1_01
CAFEEFAC-0013-0001-0004-ABCDEFFEDCBA --> static, 1.3.1_04
CAFEEFAC-0014-0000-0000-ABCDEFFEDCBA --> static, 1.4.0
... (you get the picture)
Second, you are really going to have to get your applet working with 1.4 -- Microsoft was kind enough with IE 6 to drop support for Netscape-style plug-ins, which is what all the Sun JRE's except 1.4 use (making them unusable with IE 6). If you want Java on IE 6, your only options are the MS Runtime (1.1.4) or Sun's 1.4 JRE.
Now, under IE 5, all the runtimes will co-exist fine, but you need to install them IN ORDER -- Make sure 1.3 goes on before 1.4, etc. or you will be constantly plagued by the autodownloading messages.

Using different JREs to compile and run JNI program

Hi,
Is it possible to use a JRE to compile a JNI program and then use another JRE to run it? For example, I'm compiling my program linking with Sun's libjvm.so and libjava.so. But at run time, I'll change my LD_LIBRARY_PATH to point to IBM's libjvm.so and libjava.so. Would it work at all?

Oh I forgot to mentioned that I'm trying to invoke JVM in a C program to execute pre-compiled java byte code. (my bad... should've made that clear) So when I say "compile", I mean to compile C files instead of java files. So my original question is: is it possible to compile a C program invoking JVM linking with java and jvm libraries from vendor A and then at runtime, swapping java and jvm libraries with the ones from vendor B? (Since libjava.so and libjvm.so are dynamic libraries, it should work. But I was just making sure...) After some testing, I was able to compile my C program linking with Sun's libraries and to run it with IBM's libraries.

JRE 1.3 and Windows NT

We are running a java application on a Win NT SP6 machine. This app should create a log file, write one line (indicating the date/time the file was opened) to it and finally bring up the main window. This has always worked on Win 9x and Win NT so far. But in this case, it seems like some error occurs when trying to write to the file, because the file is created but it is empty and the main window never comes up.
Could there be a problem with the version of Microsoft VM installed? The PC is in Mexico and I am not sure if it is an international version of NT. Could that have anything to do with it?
Here is the function that writes to the file:
public void setLogFile(File f) throws IOException {
if (f.exists())
out = new PrintWriter(new FileOutputStream(f.getAbsolutePath(), true));
else
out = new PrintWriter(new FileOutputStream(f));
out.println("Log opened on " + fdate());
Any ideas are greatly appreciated.

this is too simple maybe, but just to be sure: a
difference between english and german versions of nt
is that the programs directory is called "c:\program
files" (english) or "c:\programme" (german) - maybe
something similar is happening with spanish and
english in your case ? different spellings of the same
directory ??Thanks for the reply, but JRE is installed in c:\program files\...
folder. So maybe their NT version is the standard US English version.
I am going to try to install the whole JDK (vs. only JRE) hoping that might solve the problem. Don't know what else to do!

Jre 1.3 and 1.4 ssl incompatible

hi guys
ive done a complete user authentification service with own server and client using jce and jsse.. everything works fine.. my development platform was windows 2000 and suse linux 7.3 - both on jre 1.4..
but now i tried to use it with a 1.3 client and a 1.4 server.. it doesnt work anymore - it tells me "invalid encoding for signature". is there any known incompatiblity?
please tell me if so.
thx in advance
cu

Hi,
I am facing similar problem, when i start my tomcat server with a DSA keystore on JDK1.3.1, on the client side i am getting the Exception :
javax.net.ssl.SSLException: Server key, java.security.SignatureException: invalid encoding for signature with JDK1.3.1 or JDK1.4,
When my server is started with JDK1.4, it works fine with JDK1.3.1 and JDK1.4 clients,
any body has come across this problem, any info would be of great help.

JRE 5.0 and MS Runtime Error!

When I inadvertently let the 5.0 JRE install on my machine, I started getting a "Runtime Error!" in MS Windows Explorer.
The error was like this:
Microsoft Visual C++ Runtime Library
Runtime Error!
Program: C:\WINNT\explorer.exe
This application has requested the Runtime to terminate it in an unusual way.
Please contact the applications support team for more information.
Everytime I opened Windows Explorer, it would poppup this message and then crash the explorer. We tried multiple things to fix it, lots of ideas on the internet, but the only thing that would stop it is removing the JRE. Anyone else getting the problem?
FYI
I did not have google toolbar on my machine
my computer is well protected against virus' and adwares

Yes, I'm having this same issue after the exact same thing...let JRE 5.0 install, over-writing the old JRE. I'm going to uninstall the 5.0 and see if it helps.
I'm running XP on a work machine and I've done everything else...registry cleaning, virus scans (in safe mode), Ad-Aware scan, no Google toolbar. I've cleaned the mcapfbho.dll file, removed all unneeded add-ons in Office, Outlook 2003, and IE 5.5. I've disabled McAffee's spamkiller and Exchange sniffer. I've ran ISPFix.exe and BHO Captor....all this and still get the error.
Hopefully removing the JRE 5.0 works.

Can't get spreadsheet report with JRE update 27 and up

oracle forms reports 10g r2. client: IE 8, win xp sp3, jre 1.6 update 29. server: win 2003.
I have a few reports rendering spreadsheet format, I ran those reports in forms, and get the report result with web show document and getjobid, then browser window crashed, failed to show the spreadsheet report. pdf report is fine though.
worked before JRE update 25. any idea?
much thanks.

Well, you haven't really shared enough information, so we can jus offer a guess.
I. Did you uninstall all old JRE versions before installing the new one?
2. How exactly are you attempting to open an Excel doc in the browser? In other words, are you just calling the Excel doc? Have you attempted to set the mime type...? Example:
-- Send to Excel?
        If v_excel = 'yes' Then
     mimetype := '&mimetype=application/vnd.ms-excel';
        End if;
         WEB.SHOW_DOCUMENT('/reports/rwservlet/getjobid'||substr(v_rep,instr(v_rep,'_',-1)+1)||'?'||'server='||v_repServerName || mimetype,'_blank'); 3. Exactly which version of Forms are you using?
4. Exactly which version of Office/Excel is installed on the client?
5. You claimed this worked with 1.6.0_25. Have you tried to uninstall _29 and resintall _25 in order to verify your suspicion? I doubt the JRE version is the cause of the problem in this case.

Difference between JRE 1.6 and JRE 1.5 Policy file

Hi guys,
I have written an Java Applet and I tested it in JRE 1.5.15 and works prefectly. But in JRE 1.6.10, I got this error
denied access outside a permitted URL subpath
inside the Java console
I have tried to remove the following
*codeBase "file:${{java.ext.dirs}}/*"*
in the Java Policy file
What others things should i do in order to make it works.
My Applet is to send an image to the client folder using

[Double-Post|http://forums.sun.com/thread.jspa?threadID=5354207]
Please stick with one forum. Or at least link the two posts so that people don´t waste time responding the same thing.
Did you look at [New Deployment Policies|http://java.sun.com/javase/6/webnotes/deploy/deployment-policy.html] for Java 6?

Difference between jre 1.5 and 1.6 ,plz provide links

friends
please share your knowledge on jre1.5 and jre1.6.Please provide any website link regarding this.
I want to install jre 1.6 in my system.
sujith

Read the documentation (especially Release Notes) available at the 1.6 download site. Differences are listed.

JRE v5.0 and video problem!!! Ugent!

Hi all
I ve got a major problem:
I installed JRE v5.0 because of using Azureus, and always when Azureus is runnning, also the JRE is running. But in this time when JRE is running I have a problem with watching video, seem like the video overlay wont be able to work.
For example when I start a movie there is no video to see, only sound is coming. Also when I start TV card there is no video signal to see, only soun-voice etc.
So please advice to solve this problem, maybe it is already solved in this forum but somehow I didnt find it, so if yes, then post mi a link...
thanx a lot
System:
Windows XP Sp1
newest Nvidia drivers 81.55

ok...issue solved...
dont know if its problem of the JRE or the Nvidia card but its redicolous.
Solution is:
Antialiasing in the settings of VGA card can not be manually set to 2x or 4x or etc. but must be set to controlled by application!!!!
if u all know some other solution dont hesitate and tell...becauce this solution really doesn�t satisfied me at all

JRE 1.3 and multiprocessors

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