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  • Runtime.exec causes duplicate JVM to hang indefinitely until killed (Solaris 10)

    - by John
    All, We are running a J2EE application on WebLogic server 9.2 MP2 with a jrockit 64-bit JVM (27.3.1) on Solaris 10. We call use runtime.exec to call an executable called jfmerge to create PDF documents. We have found that in Solaris, when runtime.exec is called, a duplicate JVM is temporarily spawned to kick off the jfmerge process. While this is inefficient (our JVM is 5 GB, thus the duplicated shell JVM is also 5 GB), the major problem lies in the fact that when there is heavy load on this functionality (PDF generation) in our application, sometimes the duplicated JVM never exits. When the JVM hangs, the servers create large issues (extreme application slowness and terminated user sessions) as the entire duplicate JVM get's all of its 5 GB of process size written to disk swap. We have noted the following hung thread correlated with a hung JVM process until the process is manually killed: "[STUCK] ExecuteThread: '17' for queue: 'weblogic.kernel.Default (self-tuning)'" id=3463 idx=0x158 tid=3460 prio=1 alive, in native, daemon at jrockit/io/FileNativeIO.readBytesPinned(Ljava/io/FileDescriptor;[BII)I(Native Method) at jrockit/io/FileNativeIO.readBytes(FileNativeIO.java:30) at java/io/FileInputStream.readBytes([BII)I(FileInputStream.java) at java/io/FileInputStream.read(FileInputStream.java:194) at java/lang/UNIXProcess$DeferredCloseInputStream.read(UNIXProcess.java:227) at java/io/BufferedInputStream.fill(BufferedInputStream.java:218) at java/io/BufferedInputStream.read(BufferedInputStream.java:235) ^-- Holding lock: java/io/BufferedInputStream@0xfffffffec6510470[thin lock] at gov/v3/common/formgeneration/sessionbean/FormsBean.getProcessStatus(FormsBean.java:809) at gov/v3/common/formgeneration/sessionbean/FormsBean.createPDF(FormsBean.java:750) at gov/v3/common/formgeneration/sessionbean/FormsBean.getTemplateDetails(FormsBean.java:450) at gov/v3/common/formgeneration/sessionbean/FormsBean.generateSinglePDF(FormsBean.java:1371) at gov/v3/common/formgeneration/sessionbean/FormsBean.generatePDF(FormsBean.java:263) at gov/v3/common/formgeneration/sessionbean/FormsBean.endorseDocument(FormsBean.java:2377) at gov/v3/common/formgeneration/sessionbean/Forms_qaco28_EOImpl.endorseDocument(Forms_qaco28_EOImpl.java:214) at gov/v3/delegates/common/FormsAndNoticesDelegate.endorseDocument(FormsAndNoticesDelegate.java:128) at gov/v3/actions/common/EndorseDocumentAction.executeRequest(EndorseDocumentAction.java:68) at gov/v3/fwk/controller/struts/action/V3CommonDispatchAction.dispatchToExecuteMethod(V3CommonDispatchAction.java:532) at gov/v3/fwk/controller/struts/action/V3CommonDispatchAction.executeBaseAction(V3CommonDispatchAction.java:336) at gov/v3/fwk/controller/struts/action/V3BaseDispatchAction.execute(V3BaseDispatchAction.java:69) at org/apache/struts/action/RequestProcessor.processActionPerform(RequestProcessor.java:484) at gov/v3/fwk/controller/struts/requestprocessor/V3TilesRequestProcessor.processActionPerform(V3TilesRequestProcessor.java:384) at org/apache/struts/action/RequestProcessor.process(RequestProcessor.java:274) at org/apache/struts/action/ActionServlet.process(ActionServlet.java:1482) at org/apache/struts/action/ActionServlet.doGet(ActionServlet.java:507) at gov/v3/fwk/controller/struts/servlet/V3ControllerServlet.doGet(V3ControllerServlet.java:110) at javax/servlet/http/HttpServlet.service(HttpServlet.java:743) at javax/servlet/http/HttpServlet.service(HttpServlet.java:856) at weblogic/servlet/internal/StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227) at weblogic/servlet/internal/StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125) at weblogic/servlet/internal/ServletStubImpl.execute(ServletStubImpl.java:283) at weblogic/servlet/internal/ServletStubImpl.execute(ServletStubImpl.java:175) at weblogic/servlet/internal/WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3231) at weblogic/security/acl/internal/AuthenticatedSubject.doAs(AuthenticatedSubject.java:321) at weblogic/security/service/SecurityManager.runAs(SecurityManager.java:121) at weblogic/servlet/internal/WebAppServletContext.securedExecute(WebAppServletContext.java:2002) at weblogic/servlet/internal/WebAppServletContext.execute(WebAppServletContext.java:1908) at weblogic/servlet/internal/ServletRequestImpl.run(ServletRequestImpl.java:1362) at weblogic/work/ExecuteThread.execute(ExecuteThread.java:209) at weblogic/work/ExecuteThread.run(ExecuteThread.java:181) at jrockit/vm/RNI.c2java(JJJJJ)V(Native Method) -- end of trace We would like to do a couple of things: 1.) Prevent the spawning of a duplicate JVM, as we do not need any of it's functions when executing the simple jfmerge executable, and it creates massive overhead. 2.) In the short term at least prevent this duplicate JVM from handing indefinitely.

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  • What's the best, Escape then store Or store then escape the output?

    - by Axel
    Hi, After doing a long search on stackoverflow i didn't find any one talked about this even if it's a big choice, the Question is what's the best in order to prevent both of XSS and SQL injection, Escaping the data then store it in the DB or Store it as it is and escape when output it? Note: it is better if you give some examples of practics if possible. Thanks

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  • jquery - validate characters on keypress?

    - by TwixxyKit
    I have a form text field that I want to allow only numbers and letters in. (i.e., no #$!, etc...) Is there a way to throw up an error and prevent the keypress from actually outputting anything if the user tries to use any character other than numbers and letters? I've been trying to find a plugin, but haven't really found anything that does this...

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  • php file_get_content and &amp;

    - by Patrick
    Hello all, I'm trying to use php's file_get_content('a url'); The thing is if the url has '&' in it, for example file_get_content('http://wwww.google.com/?var1=1&var2=2') it automatically make a requests to wwww.google.com/?var1=1&amp;var2=2 How do I prevent that from happening?

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  • Empty "for" loop in Facebook ajax

    - by celticpride
    While surfing facebook and using the Firebug network debugger I noticed that facebook's AJAX responses all start with an empty for loop. Example: for(;;);{...} Does anyone know why this is done? I assume it's to prevent some sort of XSS attack but I don't totally understand. Thanks!

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  • Android hidden title bar comes back

    - by kasplurpo
    When my app starts, the title bar is hidden. However, if I leave the app and then return (minimize or phone goes to sleep), there is a blank bar inserted at the top. Is this an intentional feature? How can I prevent it? It seems that the bar goes away after I press the menu key. This is the relevant line in the manifest file: android:theme="@android:style/Theme.Black.NoTitleBar.Fullscreen" Thanks

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  • Address already in use: JVM_Bind java

    - by harigm
    Some times whenever I restart the application, which is built on Java Struts Mysql and Jboss 4.05 Version I get the error as Address already in use: JVM_Bind Only fix that i know is to restart the machine and try again, it will work. Else Some times I do Ctrl-Alt-Del and Stop all the process related to Java, some times this also works. But what is the exact reason and how can we prevent this problem ?

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  • wxWidgets exception handling

    - by Alex Farber
    When unhandled exception is handled in wxWidgets application in Windows, program shows Abort-Retry-Ignore message produced by Widgets exception handler. I want to get normal unhandled exception behavior: program should terminate with standard Windows unhandled exception dialog. Can I prevent Widgets to catch unhahnled exceptions?

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  • android playback suddenly stopping...

    - by user306517
    I have an app that is streaming audio content and sometimes it just stops all of the suddent. the logcat windows shows -- AudioHardware pcm playback is going to standby and that's it. I saw on another thread (pun intended) that someone was saying it was because he was using too many threads. Could that really be causing this? Could i give the audio thread higher priority? Anyway to prevent the audio hardware pcm from going to standby?

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  • How to set the returnURL manually when using Ajax.ActionLink

    - by Roge
    I have this link @Ajax.ActionLink("create poll question", "CreatePoll", new { id = Model.DebateID }, new AjaxOptions { UpdateTargetId = "poll-entry-box", InsertionMode = InsertionMode.Replace, HttpMethod = "GET" }) which is pointing at a action with the [Authorize] Attribute. The login works, but the returnURL is empty so it just redirects to the index page. Is there some way to manually set the returnURL ? NOTE I am using the method described here http://haacked.com/archive/2011/10/04/prevent-forms-authentication-login-page-redirect-when-you-donrsquot-want.aspx because the login page was loading inside my partial.

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  • indirect path for download files

    - by Mac Taylor
    hey guys i need to create a download section on my website , but as i concern , i want my users can only download files with indirect links , to prevent them from sharing my files on my server such as : http://mysite.com/download/12.zip to http://mysite.com/download/12 is there a way in php to do so ?

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  • Can you restrict the location of input type=file?

    - by dcp3450
    Is there a way to restrict the user to a folder on the server when they choose to browse for a file using the input type=file button? for example: If you have images you want the user to choose from that only exist in the server's image folder to prevent them from search for and uploading their own images.

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  • Suppressing .net's updatepanel submit event handler

    - by wheresrhys
    I'm performing some custom js validation on my forms, triggered by submitting the form $("form").submit(function (e) { var validates = true; // validation code goes in here if (!validates) { e.preventDefault(); e.stopImmediatePropagation(); return false; } }) None of the lines I've included to stop the submit event prevent the .NET control posting back. Is there some way (using js or setting a property in the updatepanel control) of stopping post back?

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  • Background Activity for Map in Android started again if phone orientation is changed

    - by Dave
    Hi, i've developed an android app that's fetches an xml file and displays this data via several markers on the map. This works fine so far. The problem right now is that when i switch the orientation of the phone (portrait-landscape or vice versa) the markers disappear for a small moment, the xml processing is started again and then they reappear. Is there a way to prevent this re-loading of the file? It only takes about 2-3 seconds..so no big deal, but still disturbing

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  • Child window focus lost in c#

    - by jestges
    Hi I've two aspx pages ie. page1 and page2. In my Page1 I've a button and in that button click event I try to open page2 (some thing like window.open(page2)) it is working fine. Again I've another button in Page2. When I click Page2 button page1 getting focused. How to prevent this? Any idea?

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  • How to sign setup with .crt file?

    - by riffnl
    I've got a Comodo certificate to sign my application files with the appropriate publisher (that'll be me). But how do I sign my installation to prevent those triple "are you sure?" UAC dialogs? Am using the Visual Studio (2008) setup project, no third party tools.

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  • erlang node not responding

    - by vinnitu
    I received such message in erlang condose at first@localhost node =ERROR REPORT==== 1-Jan-2011::23:19:28 === ** Node 'second@localhost' not responding ** ** Removing (timedout) connection ** My question is - what is timeout in this case? How much time before causes this event? Howto prevent this "horror"? I can restore\recover to normal work only by restart node... But what is the right way? Thank you, and Happy New Year!

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  • Invoking web service methods from code-behind

    - by Peter Wone
    The application on which I am working has a web service exposing various methods. Most of these methods use WebOperationContext.Current to set headers up to prevent cacheing. This works fine when the service methods are consumed in AJAX via the generated proxy, but when I attempt to do the same thing from code-behind, WebOperationContext.Current is null. Can anyone tell me how to confer appropriate call context on the method invocation?

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