BUG: Unable to increase stack size in OJVM

Hi,
I have a complex ADF Faces page (jspx) that has reached the level of complexity that I can reliably cause the JVM to die when running the page with:
Fatal error: Cannot find class java/lang/StackOverflowError
Process exited with exit code -1.when running within JDeveloper. I have tried adding
-Xms1024m -Xmx1024m(yes, I know an outrageous stack size) to the project run properties, and it still crashes. However, if I change to the server JVM instead of ojvm, it works fine, even with a much smaller stack, although the default stack size will crash as well.
So,
1). Shouldn't -Xms and -Xmx work for OJVM? If not, this is going to be a pain when I need to debug, as OJVM rocks for that.
2). Is there some way to configure ADF/OC4J so that I won't bomb like this? I'm guessing that the XML document (JSPX) is big enough that it's causing the XML parser to blow up. Just a guess however.
Thanks,
John

It's unclear if the problems discussed happen after OJC compiles, or Javac compiles, or both. We have uncovered a bug in the compilation of jspx files using OJC. There is a chance that this bug fix will fix the problems mentioned. Email me at keimpe.bronkhorst AT oracle.com if you want to try out a patched OJC. This is not an OJVM fix, so if you compile with Javac, I can't help you at this time.
Keimpe Bronkhorst
JDev team

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ORA-01653 unable to increase tablespace size

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Checking stack size

I have written a JNI app and it seems to work fine, but processing with very large files I run out of stack space.
I have solved this issue for the moment by changing the stack size with the -Xss param to java but this is not the ideal issue because with even bigger files I still will have issues.
So, I have 3 questions:
1. Is there any way (in the c++ dll) to query the total stack size ?
2. Is there any way to determine free (available) stack size ?
3. Is there any way to increase the stack size when the dll is already running (if it starts to get low)
I look forward to your thoughts
Ding

I have written a JNI app and it seems to workfine,
but processing with very large files I run out
of
stack space.
That suggests that you have a design problem.
As a guess you are using recursion. Start by
unrolling the recursion code to produce a
non-recursive solution.ood Guess but there is no recursion in my code :-)
While I am always trying to optimize my design, in
this case I am constrained by 3rd party c libraries
that are using very large multi dimensional arrays of
doubles that are neccessary for lots of complicated
math doing triangualtion of satellite data. So, I
have no control over how much memory they want to
consume.
ood Guess but there is no recursion in my code :-)
Then it is unclear as to what you think a good solution would entail.
Do you intend to just to keep retrying the processing step with ever increasing stack sizes? Will that not impact the processing time? Why not just start with a larger stack size? And if the stack size just continues to grow because the file sizes are continuing to grow then what?
While I am always trying to optimize my design, in
this case I am constrained by 3rd party c libraries
that are using very large multi dimensional arrays of
doubles that are neccessary for lots of complicated
math doing triangualtion of satellite data. So, I
have no control over how much memory they want to
consume.
One solution would be to create a C app, not a java one. Find the maximum amount of stack space that you can allocate via a C app and still operate (this depends on what happens with the file itself.) The output goes to a file.
Your java app just starts that in a separate process space.
>>
>
I was referring to the native C stack, used within
the c++ dll, for which the java VM starts via the
-Vss flag. I know the initial total as I am setting
it at runtime. I just wanted to print the value from
within the dll. #2 (below) is more important
though.
That would depend on your OS and compiler.
2. Is there any way to determine free(available)
stack size ? This is the part I was mostly hoping for an answer
to, as I need to communicate with the parent java app
if the stack space gets too low, instead of just
allowing the dll to crash when it runs out
That is a two part question. You want to know the size and you want to know if it gets 'too low'.
You suggested that this is all stack based processsing. So unless you have C methods that are called by the library and in addition it is recursive in nature then this is not possible. There is no point where you could detect it.
You can analyze the file yourself and compute a size before you start processing. But if that is what you are doing then you should do it first and let the java app know the result.
Other than that most OSes allow you to catch 'system exceptions' (which might or might not be actual C++ exceptions.) One of these would be generated when the stack overflows.
You then convert into something that java understands.
For example in Windows there is a function that allows you to set up system exceptions so that they cause a C++ exception to be thrown. You would then catch this exception and convert it into a java exception.
That lets you know that it didn't work but then what?
For example in windows you can create a custom stack for the dll but only when the dll loads (so far as I know.) So to restart this you would have to unload the dll and that means that you will have to have everything wrapped in a custom class loader (which is the only way to cause a dll to be unloaded.)
Not to mention that in my experience the windows function that I mentioned above doesn't necessarily always catch everything.
>>>
>>
No. The VM must be restarted.if that is true, It i a bummer :(You can however, on most OSes, increase the stack size for the shared library. This is done on start up of the shared library. To resize it however means that the shared library must be reloaded. And the only way you can do that in the Sun VM is with a class loader.

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Mark the question as solved. Please!

Cannot increase the stack size

Hi,
We have a program which gives a StackOverflowError. Trying the increase the stack size using command line options does not work. A simple program shows that the stack is the same size, whatever option we set.
This is the program:
class StackOverflowTest
public static int counter = 0;
public static void main(String[] a)
try {
sub();
} catch (StackOverflowError e)
System.out.println("recursive calls: "+counter);
public static void sub()
counter++;
sub();
We tried several -Xss (and -Xoss) settings: 600K, 2048K, 4M but got the same recursion deep: 16683 (with Eclipse), or 16689 (command line).
We used Windows XP.
Do you have any clue?
Many thanks,
Zsolt

Oh good, they seem to have broken the forum formatting again.
====================================================================================================================
Bug ID:     4362291     Stack size argument ignored (-Xss and -ss)
====================================================================================================================
public class StackOverflowTest {
    public static int counter = 0;
    public static final void main(String[] a) {
        new Thread(new Runnable() {
            public void run() {
                try {
                    sub();
                } catch (StackOverflowError e) {
                    System.out.println("recursive calls: "+counter);
        }).start();
    public static final void sub() {
     counter++;
     sub();
/code]

How can I increase the hard limit of the stack size?

Hi,
My process gives an error of segmentation fault (SIGSEGV) that is caused because the stack limit is reached. I have a doubt about how to increase the stack size. I have tried change it with "ulimit - hard" but this size is 65532kb, and is very low for my process. How can I increase the hard limit?
Thanks.

When last I checked, the kernel had a fixed stack size limit.
Do you have the source code to this application? If so, [see this Tiger stack size article|http://homepage.mac.com/eric.c/hpc/contents/documentation/How%20to%20in crease%20the%20stack%20size%20on%20Mac%20OS%20X.pdf], and specifically have a look at the +ld -stack_size+ mechanism; rebuild the code with a bigger limit.
Entirely FWIW, this question would be more typical over in the developer forums or maybe in the Unix forum if you don't have Apple developer access. Better audience for application development and for software-related questions over there.

Increase of Stack size impact

Hi there,
Please, what is the impact of increasing the Stack size with the -Xss option for the whole system. is there any relationship or formula between -Xms, -Xmx and -Xss options.
Is it necessary to increase the -Xmx option When i increase the -Xss option.
I'm using Weblogic 9.1 within a machine of 16GB under AIX 64bits and IBM JVM. My parameters are : -Xms=-Xmx=1GB and i think pass the -Xss to 1MB because i get many StackOverflow exceptions.
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All:
I have a native thread (see below, FailoverCallbackThread) that attaches to the JVM and does a Java call through JNI. The stack size for the native thread is 256KB.
at psiUserStackBangNow+112()@0x20000000007a96d0
at psiGuessUserStackBounds+320()@0x20000000007a8940
at psiGuessStackBounds+48()@0x20000000007a8f60
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at start_thread+352()@0x20000000001457f0
at __clone2+208()@0x200000000030b9f0
This causes stack overflow in Oracle JRockit JVM. (It does not cause overflow with Oracle Sun JDK.) Is there a recommended stack size for this use case for JRockit? Is there a way to compute it roughly?
Platform Itanium 64 (linux)]
java version "1.5.0_06"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_06-b05)
BEA JRockit(R) (build R26.4.0-63-63688-1.5.0_06-20060626-2259-linux-ia64, )
mp

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and how the above things will vary for each OS and how
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Hello friends
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Regards
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Edited by: Vignesh Chinnasamy on 31-Jul-2012 02:28

HI
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Hi,
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Hi,
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BUG: Unable to increase stack size in OJVM

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