Question on Garabage Collection Overhead?

Hi,
Our application has throwing an exception called "Garage Collection Overhead limit exceeded". I had surfed in internet and found, this error will occur at if heap space is low then the garage collector will start run, after the garbage collector run also it cant able to free the heap memory then it will throw the "Garage Collection Overhead limit exceeded" message.
For solving this issue i had called the System.gc() manually whenever the tasks has been completed, i had set null to the used objects.
But this didn't solving the issue, can anyone please suggest how to solve this issue?

1. It might be that simply allocating more memory at startup with -Xmx will be sufficient.
2. It might be that you have a bug in your code where you're hanging onto objects that you no longer need.
3. It might be that your design is faulty, such that you still need the objects you're hanging onto.
4. It might be that you need to study up on the GC command line options available and find what makes sense for your particular scenario. (Google for something like tuning java garbage collection for documents describing this.)
For #2 and #3, you'll want a profiler, such as JProbe, JProfiler, OptimizeIt, or the javavisualvm that comes with the JDK download, to view how the heap is being used.

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There are not enough gold stars to go around but you all deserve them for the helpful answers.
I see on pg 175 of the Lightroom Classroom In A Book (in which there are also an unusual amount of typos) that "In the Quick Describe metadata set, the Metadata panel shows the Filename, Copy Name (if the image is a virtual copy..." This is more evidence that Lightroom and the system of Metadata is quite well developed itself, including the 'Copy Name' for a virtual copy. I have found already, in my short experience with Lightroom, that I want to work on a Virtual Copy when I'm not quite sure of the direction I want to take with a photo's adjustments. By retaining the Master 'as is' (with modest adjustments) I can always quickly go back to view the starting point (best image with modest adjustments) while I continue to work on a Virtual Copy for more experimental adjustments.
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A question on bulk collect

My Version
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit ProductionPls see the code below
declare
type empno_arr_type is table of int;
empno_arr empno_arr_type;
begin
select empno into empno_arr
from emp;
end;
Output
PLS-00642: local collection types not allowed in SQL statementsNow same code with bulk collect executes fine.
declare
type empno_arr_type is table of int;
empno_arr empno_arr_type;
begin
select empno bulk collect into empno_arr
from emp;
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What could have made the second code work since both are local collection types only?
Thanks,
CJ

910555 wrote:
Just wanted to undestand what exactly is the difference other than reduced context switch with bulk bind.There is basically a single context switch with an implicit SQL cursor in PL/SQL. So whether or not bulk fetching/binding is used, is immaterial - it does not reduce context switching as there is already the minimal possible context switching for executing that implicit cursor.
E.g.
declare
begin
   --// single context switch (1 row fetched)
select salary into salaryAmount from emp where empno = 1234;
   --// single context switch (20 rows fetched)
select salary bulk collect into salaryAmounts from emp where deptno = 1234;
end;Context switching happens each time you use a SQL cursor interface. E.g.
declare
cursor c is ...
begin
--// context switch
open c;
loop
    --// context switch
    fetch from c ....
end loop;
--// context switch
close c;
end;Bulk processing and binding reduce context switching when using cursor processing loops like in the above example. If you can fetch more rows per loop iterations, then there will be less context switching.
For example, the cursor outputs a 1000 rows. The above sample code using single row fetches in the loop, will have a 1000 loop iterations and therefore a 1000 context switches. A bulk fetch of a 100, will fetch a 100 rows per loop iteration for a total cost of 10 iterations and 10 context switches to consume the 1000 rows output of that cursor.
What could have made the second code work since both are local collection types only?You are confusing the receive structure (in PL/SQL) with context switching.
When you fetch from a cursor, you need to supply a PL/SQL structure to receive the output (called a SQL projection) from the cursor.
If the fetch is a single row fetch, a scalar (single value) structure is needed.
If the fetch is a multi-row (bulk) fetch, the structure needs to be an array (aka collection or nested table).

Question related to Collections

1. I have a set of type HashSet which contains words and I have created a GUI with a JTextField that allows the user to check if his "word/letter" is in the HastSet defined. If the user's word is there, I will display a message ( "The HashSet contains the word" + user_word ). But on the other hand, if the user's word is not there, I have to display a message ("The HashSet does not contain the word" + user_word). The following code works fine when the user's word is in the set but when the word is not in the set, my program just crashes with a bunch of errors.
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This is the error:
Exception in thread "AWT-EventQueue-0" java.util.NoSuchElementException
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and it says that there is an error at the following line of code:
if ( (user_word.equalsIgnoreCase(i.next())) == true){So basically, my question is what can I do in order to not get all these errors and simply display on the GUI that the set does not have this x element.
2. Is there a magic function in Java that can actually interpret XYZ as the same as zxy. For example, if my set has the word XYZ and if the user types zxy, I want to display the message " The HashSet does contain the word zyx". Or else, do I have to use a for loop and check if there is each letter of the user_word in an element found of my Set.
I sincerely thanks everyone who at least take time to read my problem and please don't feel that I am asking you to do my work. All I want is some hints of what I did wrong so that I can correct it or maybe it could be something really easy that I just couldn't see for hours and hours...
Thank you!

ti_ma wrote:
Believe me on that, I have tried using a while loop over there and my program does not only crashes but freezes my whole computer...With the "if", my method works really fine when the value is found in the set but when a value is not found in the set, it just crashes and that's what I want to avoid!You can't just stop using the correct method because you get an error or crash...find the error and fix it! It doesn't make sense to switch to a method that will never work, just because it compiles, does it?
Your current method only checks if there's a next item once, so when you get to your While loop, there's nothing checking to see if there's a next item before it attempts to read one...hence the error you're having. You need to have a While(hasnext()) loop, and inside that, check if next() is the item.

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It looks like a Full GC cycle is run exactly every minute on a IDLE BPEL instance that does not have any instances. This is a basic 10.1.3.1.0 BPEL install with no Out of the box parameters modified / tuned. Is this a known issue / bug with a fix ?
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S0 S1 E O P YGC YGCT FGC FGCT GCT
0.00 62.95 29.18 11.66 99.66 651 13.801 62 62.792 76.593
18.75 0.00 86.85 11.78 99.67 666 14.103 63 63.845 77.948
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0.00 25.00 67.50 10.94 99.65 807 16.897 72 72.776 89.673
0.00 62.95 23.52 11.06 99.65 823 17.219 73 73.728 90.947
$ top -p 7123
7123 vvedula 17 0 1491m 338m 46m S 3.0 16.7 6:45.31 java => 3% CPU usage

Thanks for the replies. Let me clarify a few things:
1) We've tried setting -Xms to -Xmx (a long time ago, so maybe it's time to revisit), but doing so caused our app to exhibit other strange behavior due to the fact that no full GCs were ever done until all the allocated memory was exhausted. These full GCs, when finally triggered, ended up taking quite some time due to the fact that there was a lot of compaction (or attempted compaction) going on.
2) I don't have a problem with doing full GCs (I use the term full GC because both a young and old generation GC happens at every full GC), but I have a problem with the full GCs happening every 2 or 3 seconds and taking up 100% cpu for minutes (because the concurrent phases would run back-to-back for every full GC). Especially when the app has 1/10th the volume of our other app which does a young gc every 20s or so and a full gc every 5 or 6 minutes.
We've gone ahead and set the initial heap size to -Xms5g for today's run. We initially went without setting -Xms (again, just like our other instance) and we started seeing full GCs almost immediately as the JVM did not want to allocate more heap. We then went with -Xms2g which delayed the full GCs for a few hours until the used heap got close to the allocated heap. Full GCs then kicked in for cycles (15 or 30 mins long) until the JVM increased the heap by a few hundred mb each time.
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I'll respond back with updates.
Thx,
Josh
Edited by: user10720003 on Aug 12, 2009 4:15 AM

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imagine!

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go tru below code to display alert messsaces to the user
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<%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html" %>
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getPID
</title>
<html:javascript formName="pidAForm"/>
</head>
<body bgcolor="#ffffff">
<html:errors/>
<html:form action="/pidAction" onsubmit="return validatePidAForm(this)">
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<td><bean:message key="check.projid"/></td>
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</td>
</tr>
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<td><button id="btnObject" ></button>
</td>
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hello
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thanks
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Hi,
If I do not misunderstand your question on "WHEN", to take the overhead calculation on cost center effective, you need to setup the costing sheet and assign the costing sheet to the receiving cost centers to collect overhead before you take overhead calculation for them.

Garbage collecting threads

I am doing the following:
public class MyClass {
     private Thread t = null;
     public class testThread extends Thread{
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              String logName = this.getClass().getName();
              Logger.Print( logName ); // Basically prints logName to file
              for( int i = 1; i<4; i++){
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} What, I want to happen is a thread to finish and after that a new one to start, and once the old thread does not have any variable assoiciated to it anymore, it should get garbage collected as far as my java understnading goes, this is exactly what should happen, in duo time whenever the garabage collecter decides so. This is a very long time running program.
And the log shows the names of the threads like Thread-1 , Thread-2, Thread-3 , Thread-4, basically this name is increased by one everytime the function callThread is called and the old thread finished running, is there a limit to how many times I can call it like if it is called 10 billion times, will I have Thread-10000000000 in my log? and will the garbage collection work as I think? I am a c++ programmer so I do not trust it 100%, I really feel like adding delete t; so I can feel confident it is really gone before I do a t = new TestThread(); hehe C++ sickness??
Please give me advice on this!!! and I will be very happy!
Edited by: dakiar on Mar 19, 2008 8:18 AM

dakiar wrote:
What, I want to happen is a thread to finish and after that a new one to start,Use join(), rather than looping and checking isAlive, in order to determine when a thread has died.
while (true) {
Runnable r = new MyRunnable(); // You have no reason to extend Thread. It's preferable to implement runnable.
Thread t = new Thread(r);
t.start();
t.join();
and once the old thread does not have any variable assoiciated to it anymore, it should get garbage collected as far as my java understnading goes,It will become eligible for GC. There's no guarantee when or even if it will actually be GCed, other than that GC will at least happen before OutOfMemoryError.
And the log shows the names of the threads like Thread-1 , Thread-2, Thread-3 , Thread-4, basically this name is increased by one everytime the function callThread is called and the old thread finished running, is there a limit to how many times I can call it No.
like if it is called 10 billion times, will I have Thread-10000000000 in my log? Perahps. Or if Thread uses an int then it might wrap around to Integer.MIN_VALUE and give Thread--2147483648.
You know you can assign your own names to the Threads.
and will the garbage collection work as I think? It will work fine, and that has nothing to do with thread names.
I am a c++ programmer so I do not trust it 100%,So, you think that you managing memory ad-hoc in every program you write when you're trying to focus on implementing the business requirements of your app will be better at it than the guys who were specifically focussed on writing memory management that would be handled consisently by the computer, and has been continuously refined, not to mention tested by thousands of Java developers over the last dozen or so years?
I really feel like adding delete t; You can't and you don't need to.

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Hi Frnds
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The system should get the activty names as maintained in workcenter .routing rather as usal activity 1, 2 ,3
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Edited by: Rajan Kotagal S on Jun 3, 2009 2:03 AM

Hi Sree Gowda,
i have three options in wage group, when i am confirmation of production orders collectively by CO12 , selecting the appropriate wage group, hence i want make this feild mandatory,
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Question on Garabage Collection Overhead?

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