Resource Leak in C#

Creat64StringArray()
stream filestream = null;
1. Condition viewType.Equals("webbrowser"), taking true branch
if(ViewType = "WebBrowser")
try
                   string strPath = documents.Path; //= @ + documents.Path;
2. Condition strPath.StartsWith("\\"), taking true branch
                 if (strPath.StartsWith("\\"))
                       strPath = @"\" + documents.Path;
3. alloc_fn: A new resource is returned from allocation method OpenRead.
4. var_assign: Assigning: fileStream = resource returned from System.IO.File.OpenRead(strPath).
                   fileStream = File.OpenRead(strPath);
5. noescape: Resource fileStream is not closed or saved in Length.get.
                    fileArray = new byte[fileStream.Length];
6. noescape: Resource fileStream is not closed or saved in Length.get.
7. noescape: Resource fileStream is not closed or saved in Read.
8. Throwing System.IO.IOException from call to Read.
                    fileStream.Read(fileArray, 0, (int)fileStream.Length);
    catch (IOException ex)
10. Condition ex.Message.Contains("The process cannot access the file"), taking true branch
                 if (ex.Message.Contains("The process cannot access the file"))
                       string str = documents.Path;
                      FileInfo info = new FileInfo(str);
                      dest = DirectoryPicker.GetAppSpecificFolder(DirectoryPicker.AppFolder.DataFolder) + "\\" +info.Extension;
11. Condition System.IO.File.Exists(str), taking true branch
                      if (File.Exists(str))
                           File.Copy(str, dest);
   CID 14867: Resource leak on an exceptional path (RESOURCE_LEAK)12. overwrite_var: Overwriting fileStream in fileStream = System.IO.File.OpenRead(dest) leaks the resource that fileStream refers to.
                          fileStream = File.OpenRead(dest);
fileArray = new byte[fileStream.Length];
                           fileStream.Read(fileArray, 0, (int)fileStream.Length);
                            strImgArray[0] = System.Convert.ToBase64String(fileArray);
finally()
(filestream!=null){
filestream.close()
How to fix this Resource leak ? Please advice..

Hi
Deeyaa,
Could you please describe your scenario? And how did you get the resource Leak ?
I would suggest you provide a simplified sample about this issue, It would be better to help us to figure out the root cause.
Best regards,
Kristin
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Similar Messages

Finalize prevents "resource leak"?

As far as I can tell, " +Effective Java+ " (by Joshua Bloch) is the most recommended Java text. Therefore, I am assuming the author is credible, maybe on par with the best on this forum. Then, here is a quote from the book:
".... there is a severe performance penalty for using finalizers... So what should you do instead of writing a finalizer for a class whose objects encapsulate resources that require termination, such as files or threads? Just provide an explicit termination method, and require clients of the class to invoke this method on each instance when it is no longer needed."
I question the advisability of designing a class such that the design says "oh. by the way. when you are done using an instance of it, don't forget to call this method." Would not such a design lead to hard to find, easy to forget, resource leaks (same idea as memory leaks ). Is such a (dangerous?) practice used in real-world apps?
btw:
The issue of finalizers arose while reading about java.awt.Graphics . I read that if "g.dispose()" was not called on every instance of Graphics , if run long enough, with 100% certainity, an app would come crashing down. Some resource is exhausted. Know when it must be explicitly called, and then always put that method in a finalize block.

tatsuke wrote:
try {
ArrayList<Double> list = new ArrayList<Double>();
for(int d = 0; d < Double.MAX_VALUE;d++) { list.add(new Double(d)); }
} catch (java.lang.OutOfMemoryError e) {
// forces gc to kill all possible objects, each's finalize block is executed?
// next, not sure what to do in any practical sense.
// just checking that i understand what is going on.
First of all, If I ever find any code like this in an production environment during a code review, then the author of that code will get a very strict talking-to at least.
I can't begin to tell you how wrong this is and at how many levels.
First of all: Who tells you that the OOM-Error is thrown in this code and not in an entirely unrelated code in another Thread that happens to be the first one to request too large a block of memory? (Not unlikely, since you allocate a lot of tiny objects and the OOM-barrier can easily be hit by another thread that tries to allocate a 512k buffer for some I/O operation.
Next: you're taxing the memory settings of the JVM, forcing it to go up to its maximum size, even when the actual requirement would a fraction of the maximum size and thus potentially forcing your application (and others) into swap and slowing them down to a grinding halt, effectively producing a denial-of-service.
Next: you produce an infinite loop, because you'll never reach Double.MAX_VALUE (try printing "Double.MAX_VALUE" and "Double.MAX_VALUE - 1d" and tell me the difference).
Next: no-one said that it's possible that the object is never collected and never finalized in all situations. Of course there are situations when it has to be collected (OOM is about the only one that comes to my mind, at the moment). But that doesn't mean that you can rely on finalize() being called in all situations. Note that nothing in the spec tells you that the GC must run when you run out of file descriptors. Running the GC could help, if someone forgot to close a stream, but it is not enforced.
Next: yes, I'm pissed of at something entirely unrelated and you just happen to be there. Sorry for that. I still think the content of my comments is correct.

What is meant by a resource leak ?

What is meant by a resource leak ?

Garbage collection manages only memory, not other system resources. If your Java program has plenty of free memory, garbage collection will not be triggered automatically. Usually, however, there are other resources that are more limited than memory. For example, all OSes have limits on the number of sockets, file handles, etc. that can be open. Sometimes this limit is quite low. This is true even on a desktop, e.g. if your system has 128KB of memory, your Java program can easily allocate all the available file handles without coming near to filling up the heap. If this happens, your Java program will fail. This is what we call a resource leak; the unintentional maintenence of references to non-memory resources.
This is why it is important in Java to explicitly manage non-memory resources. Classes which utilize non-memory resources should provide ways to explicitly allocate/deallocate those resources, independent of garbage collection. For example Socket, InputStream and OutputStream each provide explicit close() methods for deallocation of file descriptors, Window provides a dispose() method to free the window handle, etc. The way to properly use these classes is to allocate using the constructor, then deallocate using the appropriate method (deallocation is preferably done in a finally{} block, so it will execute whether or not an exception is thrown during use). These classes do release these non-memory resources in their finalize() method, but remember that the finalizer only gets called by the garbage collector, and if the object is never collected, it will never be finalized, hence will never release the resources.

Run-time Moveable Control resource leaks

Hi,
I've noticed a small resource leak issue with the Run-time Movable Control library (movectrl.fp). The issue comes up when a control is made movable, then later the MOVECTRL_ATTR_ENABLED attribute is set to 0 to make the control non-movable, and then the control is discarded, either directly or by discarding the panel that the control is on.
Diving into the source code for the instrument, the reason is clear. In the callback function DynamicCtrlCallback(...) which is chained to the control that is made movable, the first thing that happens is a check that the movable attribute is set, and if not, the function bails out with an early return. The problem is that after this there is the handler for EVENT_DISCARD, that frees up the resources used by the movable control. The problem is that if the movable attribute is not set, when the control is discarded the handler for the EVENT_DISCARD is never reached and therefore the resources are not freed.
I thought I would post this to let anyone using the Run-time Movable Controls library that as a workaround you should set the MOVECTRL_ATTR_ENABLED to enabled before discarding a movable control as to not leak memory. And so that hopefully NI can fix this in a future release .
Thanks.

Hi Jason D,
No problem. I've attached a small application. It has a button that generates a pop up with some controls on it. It uses MakeMovableCtrl(..) to set all the controls movable, and then SetMovableCtrlAttribute(..) with MOVECTRL_ATTR_ENABLED set to 0 to make the graph control non-movable. If you simply close the pop up (which discards the panel), in CVI's resource tracker there is some allocated memory that is not freed and a thread lock that is not discarded. The switch on the pop up can be toggled to make the graph control movable again via SetMovableCtrlAttribute(..). If you toggle the switch and then close the pop up you'll see that the memory is freed and the thread locks are properly discarded. If you open/close the pop up multiple times without toggling the switch you'll see multiple blocks of non-freed memory and multiple non-discarded thread locks.
Thanks for looking into this.
Attachments:
Runtime Movable Controls Test.zip ‏6 KB

Help! setMaxInactiveInterval(-1), will it create resource leak on Server?

Hi,
I have a session that is set to have infinite timeout by setMaxInactiveInterval(-1). While browsing a page, the user closes his browser session.
Does the server know when to destroy this session? Will this create a resource leak on the server?
Is there any common way to get around it (assuming I have to use infinite timeout sessions)? Or is pretty much by definition the implication of infinite timeout sessions?
Thanks,
Eric.

Does the server know when to destroy this session?Yes. After an infinite amount of time has passed. (Assuming that's really the meaning of the parameter, I don't have quick access to the documentation.)
Will this create a resource leak on the server?Only if you have an unlimited number of distinct users. Otherwise you will over the long run have one session per user littering your server.
Is there any common way to get around it (assuming I
have to use infinite timeout sessions)? Or is pretty
much by definition the implication of infinite
timeout sessions?One way would be to allow the sessions to time out in a sensible way, and when that happens, dump their data into a database. Then when the user reconnects two weeks later, retrieve the data from the database and put it into the new session.

9i Connection Manager Resource Leak?

I am experiencing serious performance problems with the Connection Manager gateway (CMGW.exe) that ships with Oracle9i for Windows NT/2K.
There appears to be a memory leak after the first connection to the Connection Manager is made. I've come across mention of a similar problem with CMGW on Solaris. Is there a fix for this problem?
Background: my students are building Java applets to connect to Oracle9i via Oracle9i application server. The applets are hosted on the application server, so I was planning on using Connection Manager to hit the database from the application server. It works fine the first time, but due to the memory leak the application server slows to a crawl whenever another connection is attempted.
Thanks,
Ray Moro
Eastern Washington University

Use the same as you were using in 8i. Just upgrade your client (if required).

9879: GDI Objects resource leak in explorer.exe (directly affects Taskbar)

Update 1 (Nov 18): The leak seems to be exacerbated by the use of a progress bar within a given program's taskbar icon. For example, downloads with a browser show such status. In particular, media players often do this too, and since people
tend to use media players for an hour or two at a time, the problem can worsen quickly when in use.
===========(Original message below)
Twice in one day I've seen GDI Objects (as shown in Task Manager--if you add the column on the Details tab--and Process Explorer) hit 10K for Explorer.exe. The first time was after about 15 hours, the second time about 4.
What caused me to look was a misbehaving taskbar: icons for some running programs were suddenly either blank or changed, some would do nothing when clicked, the Start menu was barely functional, my quicklaunch shortcut menu didn't work, etc.
Killing explorer.exe and restarting it allows you to proceed as usual.
This definitely didn't happen in the preceding builds.
Further details provided if this turns out to be something that others see.

Same for PS
GDIView.ps1
$path = Split-Path -parent $MyInvocation.MyCommand.Definition
$searchfor = "explorer"
$maxGDI = 6000
$sig = @'
[DllImport("User32.dll")]
public static extern int GetGuiResources(IntPtr hProcess, int uiFlags);
Add-Type -MemberDefinition $sig -name NativeMethods -namespace Win32
$processes = [System.Diagnostics.Process]::GetProcesses()
ForEach ($p in $processes)
# Check for process
if ($p.Name -ne $searchfor) { continue }
try{
$gdiHandles = [Win32.NativeMethods]::GetGuiResources($p.Handle, 0)
# Check for maxGDI
if ($gdiHandles -lt $maxGDI) { continue }
try{
# Log
"$(Get-Date) The process $searchfor ($($p.id)) had $gdiHandles GDI Objects, so it is closed for sanity" | Out-File $path\Leak.log -Append
#Write-Output "kill $($p.Id)"
kill $p.Id -Force
#Write-Output "start $searchfor"
Start-Process $searchfor
catch {
#"Error"
catch {
#"Error accessing " + $p.Name
And to start it hidden
GDIView.vbs
Const HIDDEN_WINDOW = 0
strComputer = "."
Set objWMIService = GetObject("winmgmts:\\" & strComputer & "\root\cimv2")
Set objStartup = objWMIService.Get("Win32_ProcessStartup")
Set objConfig = objStartup.SpawnInstance_
objConfig.ShowWindow = HIDDEN_WINDOW
Set objProcess = GetObject("winmgmts:\\" & strComputer & "\root\cimv2:Win32_Process")
objProcess.Create "powershell -file GDIView.ps1", null, objConfig, intProcessID

Resource leak problem

Hi
Oracle Database 12.1.0.1.0 "standart edition one" installed on windows 2008 Server R2 SP1 (64 bit).
I configure access to remote Databases MS SQL Server 2008. The access configured via "heterogeneous services".:
1) Created ODBC source 1 : type "ODBC SQL Server 6.01.7601.17514 Microsoft Corparation", name "AOF_Statistic_140"
2) Created ODBC source 2 : type "ODBC SQL Server 6.01.7601.17514 Microsoft Corparation", name "AOF_Statistic"
3)created file "initAOF_Raport.ora" in "с:\app\oracle_db\product\12.1.0\dbhome_1\hs\admin"
Сontent of the file "initAOF_Raport.ora" :
HS_FDS_CONNECT_INFO = AOF_Raport_140
HS_FDS_TRACE_LEVEL=0
HS_LANGUAGE=RUSSIAN_RUSSIA.CL8MSWIN1251
HS_IDLE_TIMEOUT=5
HS_TRANSACTION_MODEL=READ_ONLY
4)created file "initAOF_Statistic.ora" in "с:\app\oracle_db\product\12.1.0\dbhome_1\hs\admin"
Сontent of the file "initAOF_Statistic.ora" :
HS_FDS_CONNECT_INFO = AOF_Statistic_140
HS_FDS_TRACE_LEVEL=0
HS_LANGUAGE=RUSSIAN_RUSSIA.CL8MSWIN1251
HS_IDLE_TIMEOUT=5
HS_TRANSACTION_MODEL=READ_ONLY
5) Сontent of the file "с:\app\oracle_db\product\12.1.0\dbhome_1\network\admin\listener.ora"
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = CLRExtProc)
(ORACLE_HOME = с:\app\oracle_db\product\12.1.0\dbhome_1)
(PROGRAM = extproc)
(ENVS = "EXTPROC_DLLS=ONLY:с:\app\oracle_db\product\12.1.0\dbhome_1\bin\oraclr12.dll")
(SID_DESC=
(SID_NAME= AOF_Statistic)
(ORACLE_HOME=с:\app\oracle_db\product\12.1.0\dbhome_1)
(PROGRAM=dg4odbc)
(SID_DESC=
(SID_NAME= AOF_Raport)
(ORACLE_HOME=с:\app\oracle_db\product\12.1.0\dbhome_1)
(PROGRAM=dg4odbc)
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
(ADDRESS = (PROTOCOL = TCP)(HOST = Indas-debug)(PORT = 1521))
6) Сontent of the file "с:\app\oracle_db\product\12.1.0\dbhome_1\network\admin\tnsnames.ora"
ORACLR_CONNECTION_DATA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
(CONNECT_DATA =
(SID = CLRExtProc)
(PRESENTATION = RO)
ORCL =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = Indas-debug)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = orcl)
aof_Raport =
(DESCRIPTION=
(ADDRESS=(PROTOCOL=tcp)(HOST= localhost)(PORT=1521))
(CONNECT_DATA=(SID = AOF_Raport))
(HS=OK)
aof_Statistic =
(DESCRIPTION=
(ADDRESS=(PROTOCOL=tcp)(HOST= localhost)(PORT=1521))
(CONNECT_DATA=(SID = AOF_Statistic))
(HS=OK)
7) Created public links:
CREATE PUBLIC DATABASE LINK aof_Statistic CONNECT TO "ascub" IDENTIFIED BY "111**" using 'aof_Statistic';
CREATE PUBLIC DATABASE LINK aof_Raport CONNECT TO "ascub" IDENTIFIED BY "111**" using 'aof_Raport';
8)created pl sql package "test_sql_hs" with following code:
procedure raport_rep_L337_3 is
l_dt date;
begin
---- table L337 from AOF_RAPORT
for cur1 in (select
to_date(TO_CHAR("DateAndTime", 'DD.mm.YYYY HH24:MI:SS'),'DD.mm.YYYY HH24:MI:SS') as DateAndTime,
"D3_Q" as d3_q,
"D5_Q" as d5_q,
"D7_Q" as d7_q,
"D9_Q" as d9_q,
to_number("D11_Q") as d11_q,
to_number("D13_Q") as d13_q,
to_number("Work_Time") as work_time
from L337_3@AOF_RAPORT
where "DateAndTime"> (l_dt-1)
order by "DateAndTime" asc ) loop
begin
insert into TB$A$L337 (dateandtime,d3_q,d5_q,d7_q,d9_q ,d11_q,d13_q,work_time,UPDATE_TIME)
values(cur1.dateandtime,cur1.d3_q,cur1.d5_q,cur1.d7_q,cur1.d9_q ,cur1.d11_q,cur1.d13_q,cur1.work_time,sysdate);
exception when dup_val_on_index then null;
update TB$A$L337 t set t.update_time=sysdate where t.dateandtime=cur1.dateandtime;
end;
end loop;
commit;
exception when others then
rollback;
sys_log(p_oid => 'raport_rep_L337', content => sqlerrm);
raise;
end;
procedure static_rep_L337_3 is
l_dt date;
begin
---- table L337 from AOF_RAPORT
for cur1 in (select
to_date(TO_CHAR("DateAndTime", 'DD.mm.YYYY HH24:MI:SS'),'DD.mm.YYYY HH24:MI:SS') as DateAndTime,
"D3_Q" as d3_q,
"D5_Q" as d5_q,
"D7_Q" as d7_q,
"D9_Q" as d9_q,
to_number("D11_Q") as d11_q,
to_number("D13_Q") as d13_q,
to_number("Work_Time") as work_time
from L337_3@AOF_STATISTIC
where "DateAndTime"> (l_dt-1)
order by "DateAndTime" asc ) loop
begin
insert into TB$A$L337 (dateandtime,d3_q,d5_q,d7_q,d9_q ,d11_q,d13_q,work_time,UPDATE_TIME)
values(cur1.dateandtime,cur1.d3_q,cur1.d5_q,cur1.d7_q,cur1.d9_q ,cur1.d11_q,cur1.d13_q,cur1.work_time,sysdate);
exception when dup_val_on_index then null;
update TB$A$L337 t set t.update_time=sysdate where t.dateandtime=cur1.dateandtime;
end;
end loop;
commit;
exception when others then
rollback;
sys_log(p_oid => 'raport_rep_L337', content => sqlerrm);
raise;
end;
procedure rep_MSSQL_140 is
begin
raport_rep_L337_3;
static_rep_L337_3
exception when others then
rollback;
end;
9) Created JOB which runs every 30 seconds function: test_sql_hs.rep_MSSQL_140
begin
sys.dbms_job.submit(job => :job,
what => 'begin
test_sql_hs.rep_mssql_140;
exception when others then
rollback;
end;',
next_date => sysdate,
interval => 'sysdate+30/(24*60*60)');
commit;
end;
PROBLEM IS:
Initially JOB runs normally, but after 12 hours of working errors occure:
1)code test_sql_hs.rep_mssql_140 returns error: "ORA-28511: lost RPC connection to heterogeneous remote agent using ..." permanently.
2) At the same time I can not login to OS using any windows account, I get error "Access denied". I have "lack of resources" message in Windows system log.
The problem disappears only when I reboot Windows service "OracleOraDB12Home1TNSListener" (process TNSLSNR.exe).
Any idea of this issue please let me know.

Hi,
You say you start the job every 30 seconds and you have resource problems after about 12 hours as well as an ORA-28511 error. That error indicates the connection between the gateway and SQL*Server has been lost for some reason.
To follow up -
- do you see any messages in the RDBMS alert log ?
- how many DG4ODBC processes do you see if you look at Task Manager ?
Although you have a 'commit' in the PL/SQL procedure it could be that the actual DG4ODBC connection is not being closed every time it is run.
What you could try is an explicit 'close database link AOF_STATISTIC' in the code after the 'commit' statement. This will cause the DG4ODBC process opened for the connection to be closed and a new one opened next time it is called. This should prevent any resource problems if that is the cause of the problem.
Regards,
Mike

Memory Leak in NK.exe

Hi All,
OS: Windows Embedded Compact 7 with updates till Feb 2015.
Hardware: AM335x based
Applications running: one serial port application and one tcpclient and tcpserver apps. all are managed (C#) applications
I am facing memory leak issue with our headless device.
When I connect the device to LAN network, memory usage keep increases and after few hour (some times <1 hour, some times 4-5 hour) devices go to hang state due to low memory.
I also tried to run the resource leak detector and found
1. NK.exe heap is increasing
2. on startup : API Handle Count = 4118, DuplicatedHandle - Count : 4,082, Size : 4,082 bytes
After few minutes: APIHandle - Count : 49,172, Size : 49,172 bytes, DuplicatedHandle - Count : 48,810, Size : 48,810 bytes
NK.exe heap increases as available RAM decreases.
our application heap is constant only. please find below memory snapshots taken by devhealth.
1. On device start up after all apps started
2. After 1 hour of device running. - refer attachment
where exactly might be this leak, any Guess?
Thank you...
rakesh

Hi tomleijen,
Thanks for your suggestions.
Even we tried without any user apps, then also we found ~1 MB increase in NK.exe heap every 30-40 min.
we have 2 images 1. with all WEC7 updates (Till feb 2015) and 2. without any of the WEC7 updates
almost same problem we are facing with both images.
rakesh

Resources garbage collection, can be done this way ?

The problem
I would like to apply the same concept of garbage collection to system resources like Files, Database resulsets, Sockets etc...
The reasons
I am tired of looking around desperately into a program to identify memory leak that are instead resources leak. And this is getting worse while program size grows.
How it could be done
-- Let's have a resource manager class from where I get the wanted resource (I will write this class, fairly easy).
-- Let's say that this manager class is a thread that runs in a scheduled way and this is decided by me (this is also something anybody can write).
-- Let's say that when it runs it checks for all resources (objects) that it has given to the rest of the program if the reference count greater than one. If it is > 1 then the resource is still in use, else it can be deallocated (that just means calling close and then leaving the object to garbage collect).
What I need
A way to know in a reliable way how many objects are having a reference to a given object. Is there such a way ?
Evangelism on..
Please, if anybody at Sun is reading this, this IS a TOP issue. If you look around you will see more and more issues of leaking, they are resources leakage because it is NOT easy to ALWAYS close a resource.
Someone may say "use the finally" of yes, try to think to use the finally to deallocate memory and you will immediatly understand the mess that will come.
Garbage collection is a good idea let's have a way to apply it to resources.
Thanks

I have no problem, as it is, in making applications
reliable.As usual the problems come in deciding how to do
things.Yes.
>
Which is why mine don't. Since resources are usedin
so few places it is easy to manage their usage.We are not talking on who has the biggest gun...Eh?
>
The sad thing is that the problem most of
the time is NOT yours but of somebody else thatforgot
to clean up after himself...Sounds more like a management problem than a code
problem. If you are allowing programmers in your
organization to write code which leaks resources oris
so poorly designed that other users can notproperly
dispose of resources then it is a managementproblem.
Ok, let's drop it here.
I hope you will never have to deal with code other
that yours or written by your coworkers.
I always deal with other people's code. And they with mine. Although I occassionally work on one person projects - perhaps 2 weeks every three years. the rest of my career has always involved multi-person projects and often (if not always) involve third party libraries.
So I believe I have dealt with others code.
in the applications that I work on.)There is java.lang.ref in a way it seems to dowhat
I
want....
I don't believe so. Finalize() more closely fitswhat
you might want to do. java.lang.ref is used in
building caches of disposable entities. And it is
most definitely only useable with memory.I have a funny sensation that whatever I write you say
no...Not necessarily.
Thanks for your help, if anybody wants to add
something useful to
what I am tryng to do they are welcome.I am trying to be useful.
I am trying to point out that you are looking for a new feature in the language that just isn't very useful to most people. I was trying to point out why it wasn't useful to most people.
Perhaps this might help.
Look at it this way, go look at the bug database and look at the top vote getters for things that people want fixed. Then you might trying looking through the RFEs for something like you want. If it isn't there then add it. If enough people actually want it then it will be voted for. With enough votes it would have a better chance of being added.
Of course that presumes it could be done in the first place. Based on my memory of past topics in the forums on reference counting I suspect that the answer is no. But you might want to read those.

Serious leak in Manager

I'm encountering what seems like a serious resource leak in Manager. If I call createPlayer() with a file that JMF can't open it instantiates a com.sun.media.content.unknown.Handler (line 1435 of Manager.java) and then calls setSource on the handler, which fails with an IncompatibleSourceException. However, the Manager doesn't then call close(), so you're left with a couple of SendEventQueue threads (one for the handler, one for its PlaybackEngine) which never go away.
I can quickly end up with hundreds and hundreds of threads like the following. Does that mean it's my responsibility to somehow ensure that JMF can open a file before I try to instantiate a player on it??
-Rolf
"JMF thread: SendEventQueue: com.sun.media.PlaybackEngine" prio=9 tid=0x00596c10 nid=0x1a36e00 in Object.wait() [0xb16f2000..0xb16f2d10]
     at java.lang.Object.wait(Native Method)
     - waiting on <0x0765c6f0> (a com.sun.media.SendEventQueue)
     at java.lang.Object.wait(Object.java:474)
     at com.sun.media.util.ThreadedEventQueue.dispatchEvents(ThreadedEventQueue.java:50)
     - locked <0x0765c6f0> (a com.sun.media.SendEventQueue)
     at com.sun.media.util.ThreadedEventQueue.run(ThreadedEventQueue.java:92)
"JMF thread: SendEventQueue: com.sun.media.content.unknown.Handler" prio=9 tid=0x00596540 nid=0x1a53200 in Object.wait() [0xb1671000..0xb1671d10]
     at java.lang.Object.wait(Native Method)
     - waiting on <0x0765c7b8> (a com.sun.media.SendEventQueue)
     at java.lang.Object.wait(Object.java:474)
     at com.sun.media.util.ThreadedEventQueue.dispatchEvents(ThreadedEventQueue.java:50)
     - locked <0x0765c7b8> (a com.sun.media.SendEventQueue)
     at com.sun.media.util.ThreadedEventQueue.run(ThreadedEventQueue.java:92)

This does
DataSource source;
// ... Try an instance a DataSource ....
source = (DataSource)protoClass.newInstance();
// ... and get it connected ....
source.setLocator(sourceLocator);
source.connect();
newPlayer = createPlayerForSource(source, UNKNOWN_CONTENT_NAME, sourceUsed);
If you don't want it to create a DataSource object you don't have control of, then handle the creation of the DataSource yourself using Manager.createDataSourcE();
which in turn does
mHandler = (MediaHandler)handlerClass.newInstance();
// ... set the DataSource on it ...
mHandler.setSource(source);
MediaHandler is probably a Player in this instance...
So, neither the data source nor the mHandler instance (which created SendEventQueue and PlaybackEngine threads in its constructor) are ever closed, and I'm left with two orphaned threads every time I try to open a file that JMF can't play!
No, you're not left with two orphaned threads.
From the API...
The threads managed by the Player or Processor are not in the thread group of the application that calls createPlayer or createProcessor. And a Player starts off in the Unrealized state, and if it throws a NoPlayerException, it will remain in an Unrealized state. Unrealized controllers use no system resources and they aren't part of the scheduling pool. They aren't hurting anything by being there.
I'd imagine that the thread group containing JMF-controlled threads will operate as a thread pool, and when you request a Player object, it'll try to see if there's one available in an Unrealized state, and if there is, use it instead of creating a new one. Or maybe they just sit there forever not taking up resources.
Regardless, it really doesn't matter. They aren't part of your thread group, they don't take up any resources, and they're probably reused... So just don't worry about them. :-)

GDI Resources?

I have had many problems using Captivate 1.0 to capture
screen srecordings from my CAD application. I have spoken to the
developers of the CAD program and they put it down to GDI
resources. They told me to enable GDI resources in the columns of
my Task Manager (right click) and check the amount of GDI resources
being used. My CAD application maxes out at about 2375 GDI Objects,
while Captivate 1.0 uses about 673 GDI Objects.
Does anyone know if this is excessive? Apparently this is not
dependent on hardware, but I don't know enough about it to be sure.
The reason why I am asking is because whenever I drag a dialog,
during a screen recording, Captivate shows remnants of everywhere
my dialog box has been dragged and there's no way of getting rid of
it. It's a very serious matter that may unfortunately prevent me
from using the software entirely. Maybe Captivate has a resource
leak? Maybe Captivate 2.0 solves the problem? Maybe there is a
setting somewhere that solves it?
In any case, I would like to hear from anyone who may be able
to shed some light on the subject, or even solve the problem! I
really want to use Captivate - and preferably without editing
images to remove my dialog remnants.
Thanks in advance,
spritc.

Have you adjusted the Video Acceleration option at all?
Display Properties > Settings > Advanced >
Troubleshoot.
Knock that slider down a notch and try again. If no luck,
down another
notch and try again...until there are no more notches to try
or the
recording improves.
If you can't get a decent result, perhaps try Camtasia. It's
pretty good
at these full-motion recordings...as that's how it captures
the entire
process (as a movie, not as screenshots like Captivate does).
However,
that can also result in pretty sizable output files. Camtasia
automatically disables the screen acceleration (if so
enabled), so maybe
the same principle will work with Captivate.
As a workaround idea for such things, do you actually have to
show the
window dragging? It's a pretty easy concept. Could you not
say, "Now I'm
going to move this window to the side..." and show your mouse
moving to
the window, then erase the 'wacky' frames with trails so the
next frame
is the window in the new location. It may be a bit...dramatic
of a move
but would it really hurt the instruction? I'd think only
perhaps if the
point of the instruction was to show users how to move
windows...
Also, maybe check out Display Properties > Appearance >
Effects. If
nothing else, perhaps unchecking 'show window contents while
dragging'
will solve the problem by showing the window outline during
the drag,
which should be a lot less 'GDI' intensive.
Erik
spritc wrote:
> I have had many problems using Captivate 1.0 to capture
screen srecordings from
> my CAD application. I have spoken to the developers of
the CAD program and they
> put it down to GDI resources. They told me to enable GDI
resources in the
> columns of my Task Manager (right click) and check the
amount of GDI resources
> being used. My CAD application maxes out at about 2375
GDI Objects, while
> Captivate 1.0 uses about 673 GDI Objects.
>
> Does anyone know if this is excessive? Apparently this
is not dependent on
> hardware, but I don't know enough about it to be sure.
The reason why I am
> asking is because whenever I drag a dialog, during a
screen recording,
> Captivate shows remnants of everywhere my dialog box has
been dragged and
> there's no way of getting rid of it. It's a very serious
matter that may
> unfortunately prevent me from using the software
entirely. Maybe Captivate has
> a resource leak? Maybe Captivate 2.0 solves the problem?
Maybe there is a
> setting somewhere that solves it?
>
> In any case, I would like to hear from anyone who may be
able to shed some
> light on the subject, or even solve the problem! I
really want to use Captivate
> - and preferably without editing images to remove my
dialog remnants.
>
> Thanks in advance,
> spritc.
>
Erik Lord
http://www.capemedia.net
Adobe Community Expert - Authorware
http://www.adobe.com/communities/experts/
http://www.awaretips.net -
samples, tips, products, faqs, and links!
*Search the A'ware newsgroup archives*
http://groups.google.com/group/macromedia.authorware

Finding memory leaks in java

Hello,
I have a memory leak in my application. I have found other memory leaks in the software using JProfiler, but I have a problem with JProfiler finding this one. My biggest problem is the JProfiler itself. If I use short runs, the JProfiler works fine. If I run my application for more than half a day, the JProfiler eats up memory and after a while it stops responding.
I tried JProbe, but after profiling my application for 18 hours straight, it got buggy and wouldn't work correctly. It also ate up alot of memory, and couldn't process my snapshot after 18 hours of run. I saved all snapshots, and restarted JProbe. The initial snapshot was read correctly, but the final snapshot threw an NegativeArraySizeException.
So, now I am looking for other tools which are able to find memory leaks without hanging or crashing after running 24 hours. Any recommendations?

I dont know any other profiler you can use, but how about using the divide and conquer approach?
Disable a significant section of your application and let it run for a day. If the leak occurs, its in the non disabled part.
If it doesn't, its in the disabled part. Next, enable all the code. Then disable about half of the half that failed and try that. Continue doing so until
you isolate the code enough that you can look at it and hopefully find the problem. Note you will need to keep track of what you previously enabled and disabled as a test (I put comments in the code).
Alternately, you can look at functions that perform complex functionality that you suspect might be the problem and have the function return
dummy data rather than perform the functionality. If the leak goes away, its that function(s).
Example:
public String getComplexData(String arg1, String arg2){
//this section bypasses the complex code and returns dummy data
boolean x1= true;
if(x1==true)
return new String("some dummy data");
//complex functionality goes here.
Also of help would be to list everything that can cause a memory leak (I assume its a memory leak and not a resource leak such as not closing connections).
Here are some ideas:
1) persistant class variables that are a collection that have objects added to them but never deleted and allowed to be garbage collected
such as static class variables, session scope variables, or application scope variables.
2) An object tree where one of its nodes is never set to null to be garbage collected (such as a static class variable).
If you are running a web application in a clustered enviornment, try running it on only one server.

Socket leak

I see some socket applications in my work, the client side applications usually don't bother to explicitly close the socket connection. TCP/IP doesn't specify that if a socket is not used for a long time, the socket will be closed automatically. i wonder if the client doesn't close the connection, will there be a resource leak? and will the server application hold the connection forever because the client neglects to notify it?

The client side applications need fixing. This is a basic error. Yes there is a resource leak, several in fact: the Socket object, its input and output streams, any buffers associated with them, the socket handle, the kernel structures associated with the socket, the kernel socket send and receive buffers, ... and at the server side, all that plus either a Thread or a SelectionKey and whatever is attached to it.
Socket.setKeepAlive(true) and Socket.setSoTimeout() should both be used at the server to defend against this sort of thing, but it shouldn't be permitted to enter the client application in the first place. What else don't they 'bother' to release? This is a major quality issue.

Resurce leaking and closeRowSet

Hi,
I have a view object not binding with UI component. In the application module implementation class, I use the VO's default rowset to get the row values after running executeQuery().
In this case, do I need to call "closeRowSet" in the end if the method is calling multiple times to avoid resource leaking?
If the VO is binding with the UI component at the same time, will calling "closeRowSet" cause UI issue?
Thx,
hui

Hi,
Check this link
http://adfbugs.blogspot.com/search/label/RowIterator
it might help you.
It is for a different reason but it clones and destroys the iterator after the logic. Which seems a good way of doing things.
Personally I do it as in this post.
Regards,
Dimitris.

Resource Leak in C#

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