How to set max-heap-size outside the jnlp file?

Due to bug_id=6631056 It may not be possible to specify max-heap-size within
the JNLP file for certain jnlp java applications.
Are there other possibilities to specify this Jvm parameter?
In the ControlPanel there is the possibility to specify Xmx for applets but not for jnlp.
I have tried to add properties like
"deployment.javaws.jre.0.args=Xmx\=128M" without success
Many thanks

Even in JNLP also you can specify the max heap size
<j2se version="1.5+" initial-heap-size="128m" max-heap-size="512m"/>
Thanks,
Suresh
[http://sureshdevi.co.in|http://sureshdevi.co.in]

Similar Messages

Update after max heap size change in jnlp file

Hi,
we added max-heap-size="256M" to an already via Web Start deployed application (meaning all required clients are using the application already). This attribute was the only change to the jnlp file, the application (the jar file) didn't change as well. Do clients notice this change and resize their max heap size? If not, would an application update (a new jar file) change that and the clients would update their heap size settings? Or is their any other way without uninstalling and installing the application again to notify the clients about this change?
Thanks a lot! dos

yes - a modified jnlp file (assuming the jnlp element has an href) will be downloaded the next time each of the clients use the application.
/Andy
If there is no href to the jnlp element in the jnlp file, the change will only be picked up by people who launch the app from a link on the web (as opposed to a shortcut)
/Andy

How to set a fixed size for the browser window on startup?

so the browser window has the same size and location on the desktop every time i open a new window???

In a 2D coordinate system the horizontal values are represented by some letter, usually x. In the same coordinate system the vertical values are classically represented by y.
Note: In your code, if you wish, you can replace x and y with anything you desire--p and q or perhaps jeff and alice or any variable name you wish, but for simplicity, and usually ease of understanding because almost everyone has had 100's of math problems drilled into their head with (x, y), x and y are used as convention.
In Java the screen coordinates run from 0 to the width-1 for x and 0 to height-1 for y of the component you are using to display.
So logically when you have a value of x or y that goes beyond the addressable bounds of your display, then you have to make some type of adjustment--when your value dips below 0, you reset it to 0, when your value goes above what ever width-1 or height-1 then you have to set that value to width-1 or height-1.
This all assumes that when you hit the wall, floor, or ceiling you stick there until you change directions--if you wish to wrap then you set your value to the opposite bound--so if you go below 0, you would then pop out back in on the right side--your appropriate x would be set to width-1 instead of 0 and in the case of y going below 0 your y would be set to height-1. This is also to say that when you descend below your minimum, then you would pop back out on the opposite side you went out on--so x greater then width-1 would get set to 0 and y greater than height-1 would get set to 0.
That is not even a start on if you want to include elastic collisions, angle of impact, any type of deceleration force, or anything else.
In any case... I would recommend that you add more math to your studies, I've never met an engineer or computer science grad that said: "Wow, I really regret taking all that math in college (or HS), I never use it."

Max. heap size - possibility to set in jar file ?

Hi everybody,
my first question ;-)
I used java webstart for a while to roll out my software to 2 other colleagues. There was a possibility to set the starting and maximum heap size via the jnlp file. Recently I switched my "deployment process" to a simple jar file. I looked through the jar docs and googled a bit until I found this in the [bug database|http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4682105]
and especially:
When jar file is read the maximum heap size is already set.
It is not feasible to introduce this feature.
So the only way to do this is using a script ?
Thanks in advance and enjoy your day,
Michael

Thanks for your quick and economic response.
Another way would be to use a tool like Launch4j which builds an exe file. Until now I have not been a friend of exe files for java programs. Since my application is only used in Windows environment I will have to rethink this opinion.

Strange: Mac screen menu-bar requires max-heap-size to be set.

I planned to omit the max-heap-size attribute in the line of my jnlp file
<j2se version="1.6+" max-heap-size="256m" />
The idea was that with Java 1.6 the heap size is set automatically
according to the client's RAM.
Unfortunately, the Macintosh screen menu-bar works if and only if the max-heap-size attribute is present.
It is a MacOsX=1.4 with Java1.5.
Strange, since the Mac runs Java 1.5 and I am talking about settings for 1.6.
The jnlp passed ValidateJNLP at http://mindprod.com/jgloss/jnlp.html#VALIDATION
Here is another post stating that attributes in JNLP have side effects on Mac's screen menu-bar:
http://lists.apple.com/archives/Java-dev/2008/Jul/msg00122.html
Here is my jnlp:
w3m -dump http://www.bioinformatics.org/strap/strap.jnlp
Is there an explanation for this?
Christoph

user10289576 wrote:
I would not blame Macintosh.
The error might still be in the Sun's code.Could be. But to fix the Mac VM it would require the following.
1. Find it in the Sun VM.
2. Fix it in the Sun VM.
3. Move the changes to the Mac VM...somehow.
>
If the jdk would be smaller, less redundant and clearer, then
open JDK could be possibly compiled on a Mac.
Not sure what that means since there are likely OS level calls that must be implemented in some place in the API. Which are specific to Mac.
Just as there are differences between windows/solaris/linux which Sun accounted for.
And that would be what Apple would have done to make it work on Mac. And what someone (someone who likes Mac) will need to continue to do with the public release (explusion?) which is the form that Java will have going forward.
The main thing that should be improved on a Macintosh
is to directly allow for Linux and Solaris executables such that the Linux JDK could directly work on a Mac.The main thing, again, is the Apple is no longer supporting Java on the Mac.
And Apple, not Sun and certainly not Oracle, were the ones that created the Java VM.
So the main thing at this point is that ALL future directions that Java take are dependent not on Apple but on the Macintosh community. That includes features as well as fixes.

Max Heap size of j2ee web dispatcher ??

Hello All,
Max Heap size of j2ee web dispatcher for our DEV BI 7.0 is 1024 MB.But our QA BI 7.0 system is 130 MB.I need to know in which sceanario we increase Max Heap size of j2ee web dispatcher??For BI 7.0 what should be the perfect heap size??

Dear's about what you speaking, may be i do not know anything ?
Max Heap size of j2ee web dispatcher for our DEV BI 7.0 is 1024 MB.But our QA BI 7.0 system is 130 MB.
What are web dispatcher? it's about it -->
http://help.sap.com/erp2005_ehp_04/helpdata/EN/c6/0c2c79b9fc4e1c8548815bf56300f4/frameset.htm
Where are her heap? If you say aboy dispatcher nodes in AS JAVA, when it is not "web dispatcher"
Manoj Chintawar wrote :
You should be ok to set max heap size to 1024 MB since you have 16GB of RAM in your system.
where you read abot it ? Per same Note 723909 - Java VM settings for J2EE 6.40/7.0 -->
For dispatcher nodes it's sufficient to set the heap size to 171m on 32 bit and to 256m on 64 bit platforms. There is no need to apply the parameters mentioned under 4-9 below.
Regards.

Applet 1.6 max heap size regression??

Is it true that a 1.6.0_1 applet forces 64M max heap size?
It certainly is the case on my Vista PC running 1.6.0_1 which as 2gig of physical memory.
On another PC running XP sp2 java 1.5.0_11 I am seeing that the max heaps size follows the max heap size = 1/4 max memory as I'd expect.
Is there a regression in 1.6 in this regard?
Thank you!

Is it true that a 1.6.0_1 applet forces 64M max heap
size? Not on my 1 gb XP Pro. This info is from the Java Console.
java.vm.vendor = Sun Microsystems Inc.
java.vm.version = 1.6.0_01-b06
javaplugin.maxHeapSize = 96m
It certainly is the case on my Vista PC running
1.6.0_1 which as 2gig of physical memory.
On another PC running XP sp2 java 1.5.0_11 I am
seeing that the max heaps size follows the max heap
size = 1/4 max memory as I'd expect.
Is there a regression in 1.6 in this regard?The max heap for applets running in a browser isn't controlled by Java; the heap space is shared with the browser and other plugins, and probably also varies by browser. If you give the Java plugin too much heap, other things can fail due to memory starvation.
>
Thank you!

How do define the limit of the max heap size?

Hi All,
I would like to know what should be the limit of the JVM max heap size.
What will happen if we will not define it?
What is the purpose of defining it from the technical point of view?
Thanks
Edited by: Anna78 on Jul 31, 2008 12:36 PM

Defining a max heap space too large can have the following effect:
If you create new objects, the VM may decide it is not worth getting rid of garbage-collectable ones, as there
is still plenty of space between the current heap size and the max allowed. The result will be that the
application will run faster and will consume more memory than it really needs.
If the heap size is too small, but still sufficient, the application will do a lot of garbage-collection and therefore
run slower. On the other hand, it will stay inside the tight space it has been allowed to use.
The speed difference may or may not be noticeable, while the difference between 256M and 512M may
or may not matter on today's computers.

Setting System-Wide Max Heap Size

We want to set the heap-size of Java-Plugin 1.5.0_14 for a company-wide rollout to a fixed size under Windows XP.
In deployment.config under C:\Winnt\Sun\Java\deployment I am giving this:
deployment.system.config=file:C:\\WINNT\\Sun\\Java\\Deployment\\deployment.properties
deployment.system.config.mandatory=true
In the respective deployment.properties I am giving
#deployment.properties
deployment.cache.max.size=50m
deployment.javapi.jre.1.5.0_14.args=-Xmx256m -Xms75m
While the cache-parameter is taking effect (visible in the Java Control Panel) there is no change in the Max Heap Size.
Any idea how this could be achieved?
Thank you
Michael

MaxHeapSize I determine with Runtime.getRuntime().maxMemory()
Setting it manually in the javacpl via -Xmx works fine but....
Problem is that we do not want each user to open his Java Control Panel and set this value manually.
May be error prone and difficult to communicate in a scenario where you have hundreds of users in different locations, countries etc.
Should be possible to set this value once installing the Java Plugin
Thank You
Michael

Does the jvm allocate complete max heap size initially?

Does the JVM allocate the memory for the entire max heap size up front, or does it start with the specified minimum size and increase and grab more later if needed?
The reason this is being posted is because we have a number of jboss servers that are being run. Some don't require large heap sizes, others do. If we use the same large max heap size for all would all the memory get allocated up front, or possibly a smaller initialization portion?

I have done the test with Solaris, Linux and WinXP.
Test with -Xms512M
Have written a simple java program to which the minimum heap size was set to -Xms512m then the program was executed on Solaris and WinXP platforms. The usage of memory of the Java process was 6 MB in WinXP and 9 MB in Solaris, rather than 512 MB. The JVM is not allocating the configured minimum size of 512 MB at the start of the process execution.
Reason:
If you ask the OS for 512 MB it'll say "here it is", but pages won't actually be allocated until your app actually touches them.
If the allocation is not being made initially during the start of the process, the concept of minimum heap size is not required.
But the garbage collection log shows the minimum heap size as what was configured using -Xms option.
Test with -Xms1024M
The JVM arguments was set to : -Xms1024m -Xmx1024m, but the used memory observed using Windows perfmon was 573M.
6.524: [Full GC 6.524: [Tenured: 3081K->10565K(967936K), 0.1949291 secs] 52479K->10565K(1040512K), [Perm : 12287K->12287K(12288K)], 0.1950893 secs] Reason:
Optimization is something that the operating systems do. The JVM allocates the memory in it's address space and initializes all data structures to your -Xms. In any way that the JVM can measure, the allocation from the OS is complete. But the OS doesn't physically assign a page to the app until the first store instruction. Almost all modern OSs do this.
Hope this is helpful.

"Could not create the Java virtual machine." when max-heap-size is 926Mb

We received "Could not create the Java virtual machine." when the max-heap-size provided exceeded 926 Mb in XP PC. We found the below mentioned link which confirms that this is a bug
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6945136
But the problem is that the issue does not get recreated in all the XP PCs. Increasing the max heap size to greater than 926 works fine in some XP PCs.
Could there be any configuration related issues for this problem...

If you can't find any difference in your java versions or overall runtime configurations, it's quite possible that the bug doesn't have the complete picture--it might be more subtle than the conditions described. Maybe it works with certain versions of certain lower level DLLs. Maybe it has some dependency on which services are running. Maybe the order in which certain components got installed put one version of something vs. another further ahead in a CLASSPATH, LD_LIBRARY_PATH, etc. variable.
Or maybe it's as simple as you're not running the version of Java you think you are on all those boxes, as jschell suggests.
Regardless of the reason why it happens to work on some configurations, you found that it fails on some, and that failure is in fact a known bug. So it shouldn't surprise you that it fails at least sometimes, and the fact that it works sometimes has been rendered irrelevant. Unless you're doing research into the specific cause of this issue.

Setting max heap in Oracle JVM

Hello -
I'm having a problem with a Java stored procedure running out of heap memory in Oracle 10g running Java 1.4.
Normally (running Java in a standard context) I would just modify the -Xmx with a higher value, but for the life of me I can't figure out how to do it in a stored procedure context.
I have browsed Google and I have browsed the Oracle JVM installation stuff, all to no avail.
Can anyone help me with how to set my max heap size, or verify that it's impossible? I have taken all of the standard Oracle memory parameters (JAVA_POOL, UGA/PGA/SGA limits) out of the picture by jacking them up and keeping an eye on memory values up to the point that the procedure fails (at ~700m), so I'm pretty sure that this is my problem.
So far I have looked at:
Config files
Config tables
DB parameters
I haven't been able to find anything remotely related to JVM option configuration in any of the above.
It is worth noting that I ran across another forum where someone was wanting to set their minimum heap size, and they were told that it was not possible. I'm just having trouble believing that it's the same story with something as critical as max heap size.
Much obliged for any help.
Thanks,
Annaka

From Metalink Note 466112.1:
Applies to:
Oracle Server - Enterprise Edition - Version: 9.2.0.1 to 10.2.0.3
This problem can occur on any platform.
Symptoms
When attempting to execute a java class that works fine in a stand alone JVM, fails with Oracle JVM with the following error:
ERROR
ORA-29532: Java call terminated by uncaught Java exception:
java.lang.OutOfMemoryError
ORA-06512: at "IDS_SYS.POD", line 3
Cause
The MaxMemorySize was set 256M (the default values) where the JSO needs memory more than 256 MB to run.
This can be checked as following:
SQL> create or replace function getMaxMemorySize return number
2 is language java name
3 'oracle.aurora.vm.OracleRuntime.getMaxMemorySize() returns long';
4 /
Function created.
SQL> select getMaxMemorySize from dual;
GETMAXMEMORYSIZE
268435456
After increasing the MaxMemorySize to a larger value(1 GB), the problem was fixed
Solution
Please increase the MaxMemorySize to a larger values(i.e. 1GB), this can be done as following:
SQL> create or replace function setMaxMemorySize(num number) return number
2 is language java name
3 'oracle.aurora.vm.OracleRuntime.setMaxMemorySize(long) returns long';
4 /
Function created.
SQL> select setMaxMemorySize(1024*1024*1024) from dual;
SETMAXMEMORYSIZE(1024*1024*1024)
Then you can check if the value is set correctly using the following:
SQL> select getMaxMemorySize from dual;
GETMAXMEMORYSIZE
1073741824
In my case I had to set the parameter within a job's the session.
bye
TPD
Edited by: TPD on Sep 23, 2008 4:27 PM - tags added

Setting memory heap size

Hi,
I would like to know how to set the default memory
heap size to 128 MB while installing the Java Plugin
itself.
Is there any environment variable available for setting
this?
I dont want to use the Control Panel option for setting
it.
Thanks for your help.

Hey i have the same issue, how did you solve it?
Hi Gkumarc1,
Plugin 1.3.0 (and after) reads the property filein
.java directory of user's home directory. Java
runtime parameter is saved in the property file.Here
is an example of it:
# Java(TM) Plug-in Properties
# DO NOT EDIT THIS FILE. It is machine generated.
# Use the Activator Control Panel to editproperties.
javaplugin.jre.params=-Xmx 128m
Hope this helps.
Sun-DTSIs there a way to set the default heap size on the
fly? Meaning, we want to avoid the need for our
customers to go into their control panel and make
this setting. Instead, we would like to have the
applet load with our preferred default VM size. This
would allow us to change the preferred size during
some future performance enchancements without having
to contact all of our 2,000+ external customers. Is
there something that can be put in the PARAM tag
within the HTML that specifies the
preferred/recommended default size?
Any help would be greatly appreciated.

Increase Java Max Heap Size

Hello ,
How can I increase java max heap size to more than 2G .I tried a bunch of different sizes and anything under 2G works just fine so this appears to be a hard limit.
system info:
Linux server with process data model 32-bit ,Java 1.5 , total physical memory 9GB and available virtual and physical memory close to 4GB
I would appreciate any guidance on how to resolve this.
Regards,
Omid

warnerja wrote:
Any application wanting to allocate that much of a heap size should be considered a rogue application and a system hog of gigantic proportions, not desirable to have running on anyones machine. Focus on designing it correctly so that it doesn't require so much memory in the first place.By very virtue of the fact that the author has a test box with 9 gigs of RAM (I'm inferring), it seems unlikely that this app will be distributed to just "anyone."
However, if this is meant to be some server app that scales to an enormous memory capacity, you're probably better off not using the java launcher directly and instead using some enterprise container.
I'm a complete newb when it comes to anything meant to be scalable though, so warnerja would probably have better advice than I would.

How to set a minimum size of a JFrame

hi freinds,
i have written a swing application which starts like this ,
public class workerclass extends JFrame implements ActionListener {
blah blah blah ..
now can you please tell me how to set a minimum size for this application once it starts so that user cant minimize it more than that minimum size.....
when i tried
setDefaultLookAndFeelDecorated(true);
it did my job by setting it to a particular size which wasnt minimizable, but this default look and feel looked ugly.
so i used system look and feel
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
but with this how do i set the minimum size..
please do help
and one thing more , like
in my main Method when i say
new workerclass().setSize(500,500); or say(100,100) or say(300,300)
new workerclass().setVisible(true);
the size (***,***) , doesnt reflect when my application starts, it always starts with some damn fixed size , what can be the issue .
waiting.........
Thanks

how do i set my Jrame to a minimum size so that
minimizing beyond that can be restrictedThis is what the code is all about
don't know your code but ..
import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
public class workerclass extends JFrame implements
ActionListener,ComponentListener {
public void initcomponenet()
setJMenuBar();
pack();
addComponentListener(this);
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new myclass.setSize(500,500);
new myclass().setVisible(true);
public void componentShown(ComponentEvent e)
     public void componentResized(ComponentEvent e)
          if(getWidth()<200)//restrict width to minimum 200
               setSize(200,getHeight());
if(getHeight()<100)//restrict Height to minimum
um 100
               setSize(getWidth(),100);
     public void componentMoved(ComponentEvent e)
     public void componentHidden(ComponentEvent e)
Thanks kanad , your code is working ... you desere lot more than a duke dollar but for now i can only give that :-( , please accept it :-)

How to set max-heap-size outside the jnlp file?

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