Application hangs in SetCaretPosition call

Hi,
I have a JTextArea where i append some text. When i call
m_textareaLogWindow.setCaretPosition(m_textareaLogWindow.getDocument().getLength());
the application hangs... does any one had the same problem?
sugestions are welcome.
By the way, the function that executes this code is synchronized.
thanks in advance
Cris

Hi again, i have discovered my problem.
This is a well know situation and can be found under the Bug Id 4839713.
here is an example:
WRONG CODE:
public synchronized void writeLine(String newText)
String output = textArea.getText() + newText + NL;
try{ Thread.sleep(SLEEPTIME); }catch(Exception e){}
textArea.setText(output);
textArea.setCaretPosition(output.length());
GOOD CODE:
public void workAround(String newText)
synchronized(textArea)
String output = textArea.getText() + newText + NL;
try{ Thread.sleep(SLEEPTIME); }catch(Exception e){}
textArea.setText(output);
textArea.setCaretPosition(output.length());
The first method synchronizes with 'this' (which is HangGraphics extends
JFrame)
The second one synchronizes with textArea. If you change it to 'this' the same deadlock occurs.
Adding synchronized methods might lead to deadlocks.
Cris

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DWORD NTRC;
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Just to verify you are not, in any way, using external apps via something like exec() right?
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Application hang. Skype stops interacting with wi...

Skype has suddenly stopped working and I cannot access anything in the skype window. Nothing in the menu is accessible and have to close it out using task manager... Event log shows the following error.
Log Name: Application
Source: Application Hang
Date: 3/1/2015 12:10:08 AM
Event ID: 1002
Task Category: (101)
Level: Error
Keywords: Classic
User: N/A
Computer: Petie-PC
Description:
The program Skype.exe version 7.1.0.105 stopped interacting with Windows and was closed. To see if more information about the problem is available, check the problem history in the Action Center control panel.
Process ID: 4d4
Start Time: 01d053e94bb9dd10
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Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<System>
 <Provider Name="Application Hang" />
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 <Keywords>0x80000000000000</Keywords>
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 <EventRecordID>44618</EventRecordID>
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 <Computer>Petie-PC</Computer>
 <Security />
</System>
<EventData>
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 <Data>7.1.0.105</Data>
 <Data>4d4</Data>
 <Data>01d053e94bb9dd10</Data>
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 <Data>C:\Program Files (x86)\Skype\Phone\Skype.exe</Data>
 <Data>
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 <Binary>54006F00700020006C006500760065006C002000770069006E0064006F0077002000690073002000690064006C00650000000000</Binary>
</EventData>
</Event>

Try to reset all Skype settings.
Quit Skype or use Windows Task Manager to kill any Skype.exe process. Go to Windows Start and in the Search/Run box type %appdata% and then press Enter or click the OK button. The Windows File Explorer will pop up. There locate a folder named “Skype”. Rename this folder to something different, e.g. Skype_old.
Next go to Windows Start and in the Search/Run box type %temp%\skype and then press Enter or click the OK button. Delete the DbTemp folder.
Restart Skype.
N.B. If needed, you will still be able to re-establish your call and chat history. All data is still saved in the Skype_old folder.

Concurrent Data Store (CDB) application hangs when it shouldn't

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#0 0x0000003ad860b309 in pthread_cond_wait@@GLIBC_2.3.2 ()
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int status;
Backend* backend = (Backend*)malloc(sizeof(Backend));
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DB* db;
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db->close(db, 0);
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env->close(env, 0);
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The interface library also registers the following code to be executed when any process that uses the interface library exits:
if (NULL != backend) {
DB* db = backend->db;
DB_ENV* env = db->get_env(db);
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else {
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As I indicated, all previously-executed processes that use the interface library terminated normally.
I'm using version 4.8.24.NC of Berkeley DB on the following platform:
$ uname -a
Linux gilda.unidata.ucar.edu 2.6.27.41-170.2.117.fc10.x86_64 #1 SMP Thu Dec 10 10:36:29 EST 2009 x86_64 x86_64 x86_64 GNU/Linux
Any ideas?

Bogdan,
That can't be it. I'm using a structured programming style in which the successful initialization of a cursor is ultimately followed by a closing of the cursor. There's only one place where the code does this and it's obvious that the cursor gets released.
I've also read the CDB section.
--Steve Emmerson

Drag and Drop Problem in JTree - Application hangs

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This problem doesn't appear always. It appears sometimes.
I hope get help for someone who has the solution for this problem.
Thanks in advanced.

Ok, I think I see the problem:
 props.put("mail.smtp.timeout ", "1000");
 props.put("mail.smtp.connectiontimeout ", "1000");
Why do you have spaces at the end of the property names?
Those spaces are not being ignored, which means you've
set the wrong properties.

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Hello,
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Sun Solaris 5.8
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It looks like our version of the JDK offer a connect method with a timeout value, I think this will do the trick.

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Hi all,
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From dos prompt I have used the type commad.
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Log - rwserver.trc shows the following:
[2011/6/14 4:48:28:437] Debug 50103 (JobManager:updateJobStatus): Finished updating job: 1051
[2011/6/14 4:48:28:484] Debug 50103 (RWCacheItem:addFile): add file 'mmondalprn65558177.txt' for job 1051
[2011/6/14 4:48:28:484] Debug 50103 (RWCache:updateCurrentCapacity): Current cache capacity is 32948731
[2011/6/14 4:48:30:671] Exception 50157 (): Error while sending file to printer \\mmondal\mmondalprn. Exit with error code 1848
oracle.reports.RWException: IDL:oracle/reports/RWException:1.0
 at oracle.reports.utility.Utility.newRWException(Utility.java:756)
 at oracle.reports.utility.SOSD.sendPrinter(SOSD.java:128)
 at oracle.reports.server.DesPrint.sendFile(DesPrint.java:102)
 at oracle.reports.server.Destination.send(Destination.java:484)
 at oracle.reports.server.JobObject.distribute(JobObject.java:1582)
 at oracle.reports.server.JobManager.updateJobStatus(JobManager.java:2231)
 at oracle.reports.server.EngineCommImpl.updateEngineJobStatus(EngineCommImpl.java:134)
 at oracle.reports.server._EngineCommImplBase._invoke(_EngineCommImplBase.java:94)
 at com.sun.corba.se.internal.corba.ServerDelegate.dispatch(ServerDelegate.java:353)
 at com.sun.corba.se.internal.iiop.ORB.process(ORB.java:280)
 at com.sun.corba.se.internal.iiop.RequestProcessor.process(RequestProcessor.java:81)
 at com.sun.corba.se.internal.orbutil.ThreadPool$PooledThread.run(ThreadPool.java:106)
[2011/6/14 4:48:30:671] State 56016 (JobManager:updateJobStatus): Job 1051 status is: Executed successfully but there were some errors when distribute the output
REP-50159: Executed successfully but there were some errors when distribute the output
[2011/6/14 4:48:30:671] Debug 50103 (JobManager:notifyWaitingJobs): Master job 1051 notify its duplicated jobs.
[2011/6/14 4:48:30:671] Debug 50103 (JobManager:updateJobStatus): Finished updating job: 1051
[2011/6/14 4:48:30:671] Debug 50103 (EngineManager:updateEngineState): Engine rwEng-0 status is 1
[2011/6/14 4:48:30:671] State 56004 (EngineInfo:setState): Engine rwEng-0 state is: Ready
[2011/6/14 4:48:30:671] Exception 50159 (): Executed successfully but there were some errors when distribute the output
oracle.reports.RWException: IDL:oracle/reports/RWException:1.0
 at oracle.reports.server.JobManager.runJobInEngine(JobManager.java:1009)
 at oracle.reports.server.JobManager.runJobLocal(JobManager.java:1779)
 at oracle.reports.server.JobManager.dispatch(JobManager.java:1045)
 at oracle.reports.server.ConnectionImpl.runJob(ConnectionImpl.java:1280)
 at oracle.reports.server._ConnectionImplBase._invoke(_ConnectionImplBase.java:401)
 at com.sun.corba.se.internal.corba.ServerDelegate.dispatch(ServerDelegate.java:353)
 at com.sun.corba.se.internal.iiop.ORB.process(ORB.java:280)
 at com.sun.corba.se.internal.iiop.RequestProcessor.process(RequestProcessor.java:81)
 at com.sun.corba.se.internal.orbutil.ThreadPool$PooledThread.run(ThreadPool.java:106)
[2011/6/14 4:48:30:671] Debug 50103 (JobManager:runJobInEngine): Encounted exception in job 1051
[2011/6/14 4:48:30:671] Debug 50103 (ConnectionImpl:runJob): jobid = 1051 Failed with exceptionoracle.reports.RWException: IDL:oracle/reports/RWException:1.0
[2011/6/14 4:48:30:671] Exception 50159 (): Executed successfully but there were some errors when distribute the output
oracle.reports.RWException: IDL:oracle/reports/RWException:1.0
 at oracle.reports.server.JobManager.runJobInEngine(JobManager.java:1009)
 at oracle.reports.server.JobManager.runJobLocal(JobManager.java:1779)
 at oracle.reports.server.JobManager.dispatch(JobManager.java:1045)
 at oracle.reports.server.ConnectionImpl.runJob(ConnectionImpl.java:1280)
 at oracle.reports.server._ConnectionImplBase._invoke(_ConnectionImplBase.java:401)
 at com.sun.corba.se.internal.corba.ServerDelegate.dispatch(ServerDelegate.java:353)
 at com.sun.corba.se.internal.iiop.ORB.process(ORB.java:280)
 at com.sun.corba.se.internal.iiop.RequestProcessor.process(RequestProcessor.java:81)
 at com.sun.corba.se.internal.orbutil.ThreadPool$PooledThread.run(ThreadPool.java:106)
[2011/6/14 4:48:30:703] Info 56013 (ConnectionManager:release): Connection 196 is released
[2011/6/14 4:48:30:703] Info 56013 (ConnectionManager:release): Connection 197 is released
[2011/6/14 4:48:31:31] Debug 50103 (JobManager:removeJob): will remove job 51
[2011/6/14 4:48:31:31] Debug 50103 (RWCache:deleteItem): delete item for job 51
[2011/6/14 4:48:31:31] Debug 50103 (RWCacheItem:clear): job 51 become invalid
[2011/6/14 4:48:31:31] Debug 50103 (RWCache:updateCurrentCapacity): Current cache capacity is 32942484
[2011/6/14 4:48:31:46] Debug 50103 (JobManager:removeJob): removed job 51
[2011/6/14 4:48:47:906] Info 56013 (ConnectionManager:release): Connection 198 is released
[2011/6/14 4:48:51:890] Info 56013 (ConnectionManager:release): Connection 199 is released
[2011/6/14 4:50:48:437] Info 56013 (ConnectionManager:release): Connection 200 is released
Most of the time when all the instances are restarted then for the first time it runs successfully.
The above code worked fine for Last two months.

How to find out the position in which an application hangs

Hi,
is there any possibility to find out the position in a source, in which a deployed application hangs?
For example, there is an endless loop in an application, which is already deployed. In runtime the application hangs in this loop. How can I findout in which line the application hangs?
In other words, how can I see the stack of a certain process,for example, http_workerx?
Regards,
Ali
Message was edited by:
Ali Maraschi-Schouschtari

Hi Ali,
With SAP NetWeaver Composition Environment (CE) 7.1 SP3 it is very easy.
1.) Open the SAP Management Console
2.) Go to AS Java Threads tree node - you will see all the threads that are currently started on the system
3.) Check for threads that are colored in red - it takes about 30 sec the system to detect that an HTTP thread (http_workerx), as it is in your case, is hanging/executing endless loop.
4.) Right click on the hanging thread (colored in red) and pick 'Callstack' from the pop-up menu
5.) In the new window you will see the stack-trace showing what exactly this hanging thread is doing at the moment.
With the previous versions (or SPs) you need to apply a little bit more technical skills for the same result. (1) you need to do produce thread dump of the server that is suspected to have hanging thread and (2) to analyze this thread dump (check what the threads in Running state are doing). As it is in your case with the HTTP worker threads, their names are also printed in the thread dump, so you can focus only on them.

Application hangs when using ProcessStartInfo and Process.WaitForExit.

I've looked on different threads about this, but all of them uses the Process.RedirectStandardOutput = True, which I don't.
I'm trying to open a process (console application, not made by me) to make it compile a special .acs file to a .o file. The structure is simple, the only argument is the file you want to compile.
But on certain files my application hangs when trying to open the process. Here's my code:
Dim p As New Process
Dim ps As New ProcessStartInfo
ps.Arguments = SavePath 'Path example: "C:\Program Files (x86)\Zandronum\File.acs"
ps.FileName = Path.Combine(System.AppDomain.CurrentDomain.BaseDirectory(), "Script Compilers\Zandronum\acc.exe")
ps.CreateNoWindow = False
ps.ErrorDialog = False
ps.UseShellExecute = True
ps.WindowStyle = ProcessWindowStyle.Hidden
ps.WorkingDirectory = Path.GetDirectoryName(SavePath)
Dim ErrorCaptured As Boolean = False
Try
p = Process.Start(ps)
Catch ex As Exception
ErrorCaptured = True
End Try
If ErrorCaptured = False Then
p.WaitForExit()
End If
If ErrorCaptured = True Then
Exit Sub
End If
Thanks!
//Visual Vincent
EDIT:
For starting the process I use pretty much the same code that another guy made in C#. And his code is working perfectly...
// Setup process info
processinfo = new ProcessStartInfo();
processinfo.Arguments = args;
processinfo.FileName = Path.Combine(this.tempdir.FullName, info.ProgramFile);
processinfo.CreateNoWindow = false;
processinfo.ErrorDialog = false;
processinfo.UseShellExecute = true;
processinfo.WindowStyle = ProcessWindowStyle.Hidden;
processinfo.WorkingDirectory = this.workingdir;
try
process = Process.Start(processinfo);
catch(Exception e)
// Unable to start the compiler
General.ShowErrorMessage("Unable to start the compiler (" + info.Name + "). " + e.GetType().Name + ": " + e.Message, MessageBoxButtons.OK);
return false;
// Wait for compiler to complete
process.WaitForExit();
I hope your day has been better than yesterday, but that it's worse than tomorrow...
Please mark as answer if I solved your problem. :)

Hi,
Have you compared the FileNames and Arguments of ones that work and ones that don`t? Is there any difference in them such as the ones that work do not contain blank spaces in the FileName or arguments and the ones that do work don`t contain blank spaces
in them? If you find that to be the problem then you need to add Quotes to the beginning and end of the FileName or Arguments.
My first guess is the Arguments needs the Quotes like this because, i see blank spaces in your example of the Arguments.
ps.Arguments = Chr(34) & SavePath & Chr(34)
If you say it can`t be done then i`ll try it
This actually made it. I had forgotten that blank spaces makes it a new argument, silly me. I don't use process arguments that often. ;)
Thanks alot!
I hope your day has been better than yesterday, but that it's worse than tomorrow...
Please mark as answer if I solved your problem. :)

Application hangs in SetCaretPosition call

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