Preventing hang on a method call in doGet ()

Hi,
I have the following problem.
Inside the doGet() method, I have a method call X which may take a long time or hand, what it does is do some calculations and return a object Obj. Then I can send this Obj back to client.
My question is how can i set a Timeout, say 20 seconds. If the method can be finished within 20 sec, then I just let it keep going. It X takes more than 20 seconds, before X finish (or maybe it never finish) I will set a error message into Obj then sent it back to client.
Can anybody help me with some sample code or suggestion?
Any input will be appreciated.

Thanks, @Sujoy.
According to your suggestion, each expensive method will take AT LEAST the specified wait miliseconds to finish.
My solution was to start a timer thread before call the method, after the X number of miliseconds, the thread will check the return object from the method. but the problem is the thread has no way to access to the local varialbe inside the method. If you make the variable outside the doGet, which is an instance variable, every request thread will be capable of changing it, which is not acceptable.
Any better idea? thanks!

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Hi All,
What is the purpose of calling the doGet() method inside of doPost() instead of calling it directly.
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                                doGet(request,response);
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mahes

Seemingly the post and the get do exactly the same thing, so to avoid duplicate code, (s)he just simply had one call the other.
However, you shouldn't really do it this way. You should break out the parts of the methods that are the same into new methods, and call these new methods from both the post and get methods. That will allow the two methods to handle some other things slightly differently. I.E. the get method is not suppossed to cause side effects (i.e. you are not suppossed to change any data when using a get method) whereas post methods can.

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hi all,
We migrated several applications to the JDev 11g R2.
There are 2 applications that contain a bounded task flow where we define Method Call as default activity.
We need invoke specific actions before opening the page.
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Hi,
Have a look at the task flow properties, in PatchSet1, a new feature "invokeURLAllowed" is added that prevents bounded task flows from being URL accessible for security reasons. You can swithc this feature on and off
Frank
Ps.: I though that bounded task flows that you call from a URL generally needed to have a viewActivity as the default activity

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Hi,
in my use case i have a table with inputText where i have valueChage Listener method execute and one commadImageLink button(save).
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Printing from methods other than doGet()

Hi,
I want to send back a "result" string to the client side browser. Now, the problem is that it should be sent back from a method different from doGet(). Iam doing something like this................
public class A extends HttpServlet
PrintWriter out;
public void doGet() throws......................
out = response.getWriter();
public void someOtherMethod()
out.println(result);
The call in someOtherMethod() is not working. What should be done for this ?
Thank you.

Hi,
Thank you for the reply. I have tried it. The problem is Iam using a Timer class. Have a look at the code Iam using.......
public class event extends HttpServlet
private Timer t;
private static int count = 1;
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws IOException, ServletException
String eve;
String res;
eve=request.getParameter("opt");
EventAgent de=new EventAgent();
res=de.sendEventToEventAgent(eve);
PrintWriter out = response.getWriter();
out.println(res);
t = new Timer();
t.schedule(new GenerateRegNo(request,response),2,12000);
class GenerateRegNo extends TimerTask
private Random r;
private int no;
private String result;
private PrintWriter out;
public GenerateRegNo(HttpServletRequest req,HttpServletResponse
res) throws IOException
r = new Random();
out = res.getWriter();
public void run()
if(count <= 20)
DispReg();
count++;
else
t.cancel();
public void DispReg()
no = r.nextInt(3);
if(no == 0)
no = no + 11;
else
no = no + 10;
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Thank you once again.

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i was wondering if there was any way to timeout a rmi method call.
the situation i had was that a client would envoke an rmi method, and
the method would deadlock in weblogic. the client making the call will
hang forever.
thanks

Thank you for this enlightening addition. I regret I failed to perceive
earlier that your comments were to be interpreted as evidence of sincere
commitment to solving this problem.
Regarding 7.0, you'll note that I described the timeout attribute solution
as "improving stability" rather than as a complete cure. It should be borne
bear in mind that this is an alternative to a completely locked system. When
stress tested, this change did allow the application to recover and run for
the rest of the day.
I'm obliged to you for your concern regarding any liability I might be
incurring in relation to the BEA licensing agreement. Fortunately I think I
may be able to put your mind at rest on this matter relatively easily. If I
may direct your attention to the BEA support site, my experience is that on
entering the search terms "rmi descriptor timeout", the relevant information
will be revealed. Also, I suspect that, as a fellow engineer, it has not
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such, it has a DTD named "rmi.dtd" which (alas) also fails to conceal this
attribute.
While we're pursuing what has now become a gratifyingly productive vein,
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per-VM timeouts for socket calls. These were introduced in the Sun JDK 1.4.1
and so are available to people running WebLogic 8.1 today. Again these
suggestions have been tested for basic socket I/O (I haven't tried RMI). To
my knowledge these are not endorsed by BEA:
For client connections, timeouts can be set globally by passing the
following startup parameters to the JVM:
sun.net.client.defaultConnectTimeout (default: -1)
sun.net.client.defaultReadTimeout (default: -1)
sun.net.client.defaultConnectTimeout specifies the timeout (in milliseconds)
to establish the connection to the host.
sun.net.client.defaultReadTimeout specifies the timeout (in milliseconds)
when reading from input stream when a connection is established to a
resource.
(reference: Sun's Networking Properties documentation at
http://java.sun.com/j2se/1.4.1/docs/guide/net/properties.html )
Supplying non-default values for these properties should allow a server to
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Regards
Alex
On Fri, 30 Jan 2004 09:02:23 -0800, Andy Piper <[email protected]>
wrote:
Alex Thomas <[email protected]> writes:
Hardly a constructive response to what is clearly a significant problem.
First, it should be obvious that this issue will be encountered in any
distributed system using T3 or RMI, not because of any shortcoming in
WebLogic services but because of blocking behaviour in downstream systems.That's why it is a new feature in 9.0. I'm not arguing that the
use-case is invalid, simply that your suggestion should not be tried.
Second, the solution I proposed has been tested (on 7.0SP1) and does improve
overall stability, as other people here have apparently discovered.Tested by who? Not by us because we know there are significant,
dangerous, problems with the approach you describe. Support are
under strict instructions not to offer this as a solution to
anyone. If anyone in BEA told you, they shouldn't have. If you
discovered it by decompiling the code then you are in violation of
your license agreement.
There is a supported mechanism for timing out connect attempts in 7.0
and later which you can get through support, but for timing out RMI
calls you will have to wait until 9.0 (or cook up a business case for
a backport).
Hope this clears things up.
andy

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I know this will close the anonymous FileInputStream:
DataInputStream in =
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/* ... code ... */
in.close();But will this?
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I know the JavaDoc for Properties says:
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My question is will the FileOutputStream("file.txt") be closed and garbage collected eventually after this method call because I don't have a reference to it? myPropertiesClass sticks around for a long time afterwards, will the FileOutputStream as well?
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KJ

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Hi Andrew,
The method call is fully dynamic; not only the parameters can be specified dynamically but also the method name.
This is a help extract:
DATA: line     TYPE c LENGTH 80,
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DATA: meth TYPE string,
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      etab TYPE abap_excpbind_tab,
      etab_line TYPE abap_excpbind.
DATA: exc_ref TYPE REF TO cx_sy_dyn_call_error,
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meth     = 'GUI_DOWNLOAD'.
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ptab_line-kind = cl_abap_objectdescr=>exporting.
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BR,
Valentin

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Hi Matanya Zac，
Did you restart your machine? How about installing the VS2012 update 4?
>>error while trying to run project uncaught exception thrown by method
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https://social.msdn.microsoft.com/Forums/vstudio/en-US/5ead8ee9-ea09-4060-88b0-ee2e2044ff82/error-while-trying-to-run-a-project-uncaught-exception-thrown-by-method-called-through-reflection?forum=vsdebug
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From the time I created the original package (when it worked fine) until now:
1) I have been using the same computer, the same login account and the same permissions.
2) I have been writing to the same (32 bit) 2010 Excel file (which I created) in a folder on my local machine.
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[Load data from excel file [1]] Error: SSIS Error Code DTS_E_CANNOTACQUIRECONNECTIONFROMCONNECTIONMANAGER. The AcquireConnection method call to the connection manager "Excel Connection Manager" failed with error code 0xC0202009. There may be error messa

Error
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may be error message
I am using BIDS Microsoft Visual Studio 2008 and running the package to load the data from excel .
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But the error still occurs .
I checked on Google and many have used Delay validation property at Data flow task level to true but even using it at both excel connection manager and DFT level it doesnt work
Mudassar

Thats my connection string
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Are you referring to install this component -AccessDatabaseEngine_x64.exe?
http://www.microsoft.com/en-us/download/details.aspx?id=13255
Mudassar
You can try an OLEDB provider in that case
see
http://dataintegrity.wordpress.com/2009/10/16/xlsx/
you might need to download and install ms access redistributable
http://www.microsoft.com/en-in/download/details.aspx?id=13255
Please Mark This As Answer if it helps to solve the issue Visakh ---------------------------- http://visakhm.blogspot.com/ https://www.facebook.com/VmBlogs

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