event handler - Page 271

Apache HTTP and WEblogic Plug-in Location Directive question

- by user275633

All, We are using Weblogic Portal and Apache 2.x http server with the weblogic plug-in for apache for load-balancing. We have an application that right now can only be accessed from one of our managed servers. What I would like to do is us the Location directive to direct all requests for that page to the one managed server and I can't get it to work. The context that the portal tries to forward to is something like /MyWebApp?portalusername= (where equals a legitimate user. For example /MyWebApp?portalusername=joesmith All other applications and the plug-in is load balancing as expected because every now and then you'll get sent to teh second managed server for this particular application and its not deployed. I tried various things in the apache http.conf like the following but can't seem to get it work? Any suggestions? The followign is a snippet of the httpd.conf: (Note formatting did not come thru properly but it is formatted correctly in my httpd.conf) Blockquote Location /MyWebApp SetHandler weblogic-handler WebLogicCluster myserver:7011 Location Blockquote Location / SetHandler weblogic-handler WebLogicCluster myserver:7011, myserver2:7012 Location Thanks in advance.

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How to properly close a UDT server in Netty 4

- by Steffen

I'm trying to close my UDT server (Netty 4.0.5.Final) with shutDownGracefully() and reopen it on the same port. Unfortunately, I always get the socket exception below although it waits until the future has completed. I also added the socket option SO_REUSEADDR. What is the proper way to do this? Exception in thread "main" com.barchart.udt.ExceptionUDT: UDT Error : 5011 : another socket is already listening on the same UDP port : listen0:listen [id: 0x323d3939] at com.barchart.udt.SocketUDT.listen0(Native Method) at com.barchart.udt.SocketUDT.listen(SocketUDT.java:1136) at com.barchart.udt.net.NetServerSocketUDT.bind(NetServerSocketUDT.java:66) at io.netty.channel.udt.nio.NioUdtAcceptorChannel.doBind(NioUdtAcceptorChannel.java:71) at io.netty.channel.AbstractChannel$AbstractUnsafe.bind(AbstractChannel.java:471) at io.netty.channel.DefaultChannelPipeline$HeadHandler.bind(DefaultChannelPipeline.java:1006) at io.netty.channel.DefaultChannelHandlerContext.invokeBind(DefaultChannelHandlerContext.java:504) at io.netty.channel.DefaultChannelHandlerContext.bind(DefaultChannelHandlerContext.java:487) at io.netty.channel.ChannelDuplexHandler.bind(ChannelDuplexHandler.java:38) at io.netty.handler.logging.LoggingHandler.bind(LoggingHandler.java:254) at io.netty.channel.DefaultChannelHandlerContext.invokeBind(DefaultChannelHandlerContext.java:504) at io.netty.channel.DefaultChannelHandlerContext.bind(DefaultChannelHandlerContext.java:487) at io.netty.channel.DefaultChannelPipeline.bind(DefaultChannelPipeline.java:848) at io.netty.channel.AbstractChannel.bind(AbstractChannel.java:193) at io.netty.bootstrap.AbstractBootstrap$2.run(AbstractBootstrap.java:321) at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:354) at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:366) at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:101) at java.lang.Thread.run(Thread.java:724) A small test program demonstration the problem: public class MsgEchoServer { public static class MsgEchoServerHandler extends ChannelInboundHandlerAdapter { } public void run() throws Exception { final ThreadFactory acceptFactory = new UtilThreadFactory("accept"); final ThreadFactory connectFactory = new UtilThreadFactory("connect"); final NioEventLoopGroup acceptGroup = new NioEventLoopGroup(1, acceptFactory, NioUdtProvider.MESSAGE_PROVIDER); final NioEventLoopGroup connectGroup = new NioEventLoopGroup(1, connectFactory, NioUdtProvider.MESSAGE_PROVIDER); try { final ServerBootstrap boot = new ServerBootstrap(); boot.group(acceptGroup, connectGroup) .channelFactory(NioUdtProvider.MESSAGE_ACCEPTOR) .option(ChannelOption.SO_BACKLOG, 10) .option(ChannelOption.SO_REUSEADDR, true) .handler(new LoggingHandler(LogLevel.INFO)) .childHandler(new ChannelInitializer<UdtChannel>() { @Override public void initChannel(final UdtChannel ch) throws Exception { ch.pipeline().addLast(new MsgEchoServerHandler()); } }); final ChannelFuture future = boot.bind(1234).sync(); } finally { acceptGroup.shutdownGracefully().syncUninterruptibly(); connectGroup.shutdownGracefully().syncUninterruptibly(); } new MsgEchoServer().run(); } public static void main(final String[] args) throws Exception { new MsgEchoServer().run(); } }

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Uninitialized array offset

- by kimmothy16

Hey everyone, I am using PHP to create a form with an array of fields. Basically you can add an unlimited number of 'people' to the form and each person has a first name, last name, and phone number. The form requires that you add a phone number for the first person only. If you leave the phone number field blank on any others, the handler file is supposed to be programmed to use the phone number from the first person. So, my fields are: person[] - a hidden field with a value that is this person's primary key. fname[] - an input field lname[] - an input field phone[] - an input field My form handler looks like this: $people = $_POST['person'] $counter = 0; foreach($people as $person): if($phone[$counter] == '') { // use $phone[0]'s phone number } else { // use $phone[$counter] number } $counter = $counter + 1; endforeach; PHP doesn't like this though, it is throwing me an Notice: Uninitialized string offset error. I debugged it by running the is_array function on people, fname, lname, and phone and it returns true to being an array. I can also manually echo out $phone[2], etc. and get the correct value. I've also ran is_int on the $counter variable and it returned true, so I'm unsure why this isn't working as intended? Any help would be great!

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What is actually happening to this cancelled HTTP request?

- by Brian Schroth

When a user takes a particular action on a page, an AJAX call is made to save their data. Unfortunately, this call is synchronous as they need to wait to see if the data is valid before being allowed to continue. Obviously, this eliminates a lot of the benefit of using Asynchronous Javascript And XML, but that's a subject for another post. That's the design I'm working with. The request is made using the dojo.xhrPost function, with a 60s timeout parameter, and the error handler redirects to an error page. What I am finding in testing is that in Firefox, if I initiate the ajax request and then press ESC, the page hangs waiting for a response, and then eventually after exactly 90s (not 60s, the function's timeout), the error handler will kick in and redirect to the error page. I expected this to happen, but either immediately as soon as the request was cancelled, or after 60s due to the timeout value being 60s. What I don't understand is why is it 90s? What is actually happening under the hood when the user cancels their request in Firefox, and how does it differ from IE, where everything works fine exactly the same as if the request had not been cancelled? Is the 90s related to any user-configurable browser settings?

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Issue in achartengine jar file

- by Anshuman

Actually i have created an app in which i have used achartengine to contruct graph. It was running ok, but today i saw an update for android SDK to r17. Once i upadated the sdk the app i had build started crash. In the logcat i show the following error report. Why this happen, is it because the jar file i have used is deprecated. 03-27 14:44:26.320: E/AndroidRuntime(4360): java.lang.NoClassDefFoundError: [Lorg.achartengine.chart.PointStyle; 03-27 14:44:26.320: E/AndroidRuntime(4360): at in.com.example.ChartEngineActivity.onCreate(ChartEngineActivity.java:58) 03-27 14:44:26.320: E/AndroidRuntime(4360): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 03-27 14:44:26.320: E/AndroidRuntime(4360): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611) 03-27 14:44:26.320: E/AndroidRuntime(4360): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663) 03-27 14:44:26.320: E/AndroidRuntime(4360): at android.app.ActivityThread.access$1500(ActivityThread.java:117) 03-27 14:44:26.320: E/AndroidRuntime(4360): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931) 03-27 14:44:26.320: E/AndroidRuntime(4360): at android.os.Handler.dispatchMessage(Handler.java:99) 03-27 14:44:26.320: E/AndroidRuntime(4360): at android.os.Looper.loop(Looper.java:130) 03-27 14:44:26.320: E/AndroidRuntime(4360): at android.app.ActivityThread.main(ActivityThread.java:3683) 03-27 14:44:26.320: E/AndroidRuntime(4360): at java.lang.reflect.Method.invokeNative(Native Method) 03-27 14:44:26.320: E/AndroidRuntime(4360): at java.lang.reflect.Method.invoke(Method.java:507) 03-27 14:44:26.320: E/AndroidRuntime(4360): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 03-27 14:44:26.320: E/AndroidRuntime(4360): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 03-27 14:44:26.320: E/AndroidRuntime(4360): at dalvik.system.NativeStart.main(Native Method)

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android numberformat exception

- by asifkt

my application shows this number format exception errror while running. 1 0-22 11:09:06.095: WARN/System.err(290): at java.lang.Long.parseLong(Long.java:330) 10-22 11:09:06.095: WARN/System.err(290): at java.lang.Long.parseLong(Long.java:307) 10-22 11:09:06.105: WARN/System.err(290): at com.htc.socialnetwork.facebook.FacebookUtils.getSyncInterval(FacebookUtils.java:54) 10-22 11:09:06.105: WARN/System.err(290): at com.htc.socialnetwork.facebook.remote.FacebookReceiver.getSyncInterval(FacebookReceiver.java:269) 10-22 11:09:06.105: WARN/System.err(290): at com.htc.socialnetwork.facebook.remote.FacebookReceiver.onReceive(FacebookReceiver.java:196) 10-22 11:09:06.105: WARN/System.err(290): at android.app.ActivityThread.handleReceiver(ActivityThread.java:2751) 10-22 11:09:06.105: WARN/System.err(290): at android.app.ActivityThread.access$3100(ActivityThread.java:126) 10-22 11:09:06.105: WARN/System.err(290): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1982) 10-22 11:09:06.105: WARN/System.err(290): at android.os.Handler.dispatchMessage(Handler.java:99) 10-22 11:09:06.105: WARN/System.err(290): at android.os.Looper.loop(Looper.java:123) 10-22 11:09:06.105: WARN/System.err(290): at android.app.ActivityThread.main(ActivityThread.java:4603) 10-22 11:09:06.105: WARN/System.err(290): at java.lang.reflect.Method.invokeNative(Native Method) 10-22 11:09:06.105: WARN/System.err(290): at java.lang.reflect.Method.invoke(Method.java:521) 10-22 11:09:06.105: WARN/System.err(290): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860) 10-22 11:09:06.105: WARN/System.err(290): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618) 10-22 11:09:06.115: WARN/System.err(290): at dalvik.system.NativeStart.main(Native Method) anybody please help me to get the reason for this error

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In IIS6, how to provide authenticated access to static files on remote server

- by frankadelic

We have a library of ZIP files that we would like to make available for download at an ASP.NET site. The files are sitting on a NAS device that is accessible from out web farm. Here is our initial strategy: Map an IIS virtual directory to the shared drive at path /zipfiles Users can download the zip files when given the URL However, if users share links to the files, anyone can download them. We would instead like to make use of the ASP.NET forms authentication in our site to validate users' requests before initiating the file transfer. A few problems: A request for a zip file is handled by IIS, not ASP.NET. So it is not subject to forms authentication. In addition, we don't want ASP.NET to handle the request, because it uses up an ASP.NET thread and is not scalable for download of large files. So, configuring the asp.net dll to handle *.zip requests is not an option. Any ideas on this? One idea we've tossed around is this: Initial request for download will be for an ashx handler. This handler will, after authentication, generate a download token which is saved to a database. Then, the user is redirected to the file with token appended in QueryString (e.g. /files/xyz.zip?token=123456789). An ISAPI plugin will be used to check the token. Also, the token will expire after x amount of time. Any thoughts on this? I have not implemented an ISAPI plugin so I'm not sure if this will even work. I would like to avoid custom coding since security is an issue and I'd prefer to use a time-tested solution.

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JSP: How can I still get the code on my error page to run, even if I can't display it?

- by Josh Hinman

I've defined an error-page in my web.xml: <error-page> <exception-type>java.lang.Exception</exception-type> <location>/error.jsp</location> </error-page> In that error page, I have a custom tag that I created. The tag handler for this tag e-mails me the stacktrace of whatever error occurred. For the most part this works great. Where it doesn't work great is if the output has already begun being sent to the client at the time the error occurs. In that case, we get this: SEVERE: Exception Processing ErrorPage[exceptionType=java.lang.Exception, location=/error.jsp] java.lang.IllegalStateException I believe this error happens because we can't redirect a request to the error page after output has already started. The work-around I've used is to increase the buffer size on particularly large JSP pages. But I'm trying to write a generic error handler that I can apply to existing applications, and I'm not sure it's feasible to go through hundreds of JSP pages making sure their buffers are big enough. Is there a way to still allow my stack trace e-mail code to execute in this case, even if I can't actually display the error page to the client?

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No JSON object could be decoded - RPC POST call

- by user1307067

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RegisterStartupScript not working after upgrading to framework 3.5

- by AaronS

I'm trying to upgrade an asp.net c# web project from framework 2.0 to 3.5. When I do this, the client side script that gets written using RegisterStartupScript isn't rendered on the client page. This works perfectly when I compile for 2.0, and for 3.0, but not when I compile for 3.5. Here is the code that isn't getting rendered: Page myPage = (Page)HttpContext.Current.Handler; ScriptManager.RegisterStartupScript(myPage, myPage.GetType(), "alertscript", "alert('test');", true); This is called from a class project, and not the web project itself, which is why I'm using the HttpContext.Current.Handler. There are no errors getting generated from the compiler, the CLR, and there are no client side JavaScript errors. If I do a search for the "alertscript" in my rendered page, the above code actually isn't there. Anyone have ideas as to what is going on? -Edit- This seems to be an issue when I'm trying to register the script from an external project. If I use the exact same code in a class file in the web project (not the code behind), it works. However, if I make a call to a method in a class from another project, it does not work. Does the ScriptManager.RegisterStartupScript not get registered correctly if performed from somewhere besides the web project itself?

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Python: Catching / blocking SIGINT during system call

- by danben

I've written a web crawler that I'd like to be able to stop via the keyboard. I don't want the program to die when I interrupt it; it needs to flush its data to disk first. I also don't want to catch KeyboardInterruptedException, because the persistent data could be in an inconsistent state. My current solution is to define a signal handler that catches SIGINT and sets a flag; each iteration of the main loop checks this flag before processing the next url. However, I've found that if the system happens to be executing socket.recv() when I send the interrupt, I get this: ^C Interrupted; stopping... // indicates my interrupt handler ran Traceback (most recent call last): File "crawler_test.py", line 154, in <module> main() ... File "/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/socket.py", line 397, in readline data = recv(1) socket.error: [Errno 4] Interrupted system call and the process exits completely. Why does this happen? Is there a way I can prevent the interrupt from affecting the system call?

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jQuery tooltip: Trouble with remove()

- by Rosarch

I'm using a jQuery tooltip plugin. I have HTML like this: <li class="term ui-droppable"> <strong>Fall 2011</strong> <li class="course ui-draggable">Biological Statistics I<a class="remove-course-button" href="">[X]</a></li> <div class="term-meta-data"> <p class="total-credits too-few-credits">Total credits: 3</p> <p class="median-GPA low-GPA">Median Historical GPA: 2.00</p> </div> </li> I want to remove the .course element. So, I attach a click handler to the <a>: function _addDeleteButton(course, term) { var delete_button = $('<a href="" class="remove-course-button" title="Remove this course">[X]</a>'); course.append(delete_button); $(delete_button).click(function() { course.remove(); return false; }).tooltip(); } This all works fine, in terms of attaching the click handler. However, when course.remove() is called, Firebug reports an error in tooltip.js: Line 282 tsettings is null if ((!IE || !$.fn.bgiframe) && tsettings.fade) { What am I doing wrong? If the link has a tooltip attached, do I need to remove it specially? UPDATE: Removing .tooltip() solve the problem. I'd like to keep it in, but that makes me suspect that my use of .tooltip() is incorrect here.

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Passing array values in an HTTP request in .NET

- by Zarjay

What's the standard way of passing and processing an array in an HTTP request in .NET? I have a solution, but I don't know if it's the best approach. Here's my solution: <form action="myhandler.ashx" method="post"> <input type="checkbox" name="user" value="Aaron" /> <input type="checkbox" name="user" value="Bobby" /> <input type="checkbox" name="user" value="Jimmy" /> <input type="checkbox" name="user" value="Kelly" /> <input type="checkbox" name="user" value="Simon" /> <input type="checkbox" name="user" value="TJ" /> <input type="submit" value="Submit" /> </form> The ASHX handler receives the "user" parameter as a comma-delimited string. You can get the values easily by splitting the string: public void ProcessRequest(HttpContext context) { string[] users = context.Request.Form["user"].Split(','); } So, I already have an answer to my problem: assign multiple values to the same parameter name, assume the ASHX handler receives it as a comma-delimited string, and split the string. My question is whether or not this is how it's typically done in .NET. What's the standard practice for this? Is there a simpler way to grab the multiple values than assuming that the value is comma-delimited and calling Split() on it? Is this how arrays are typically passed in .NET, or is XML used instead? Does anyone have any insight on whether or not this is the best approach?

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ASP.Net ListBox selections not working in Panel?

- by larryq

Hi everyone, I'm having trouble processing a listbox after selecting some items from it. In my markup, the listbox is contained within an asp:panel and is populated during page load in the codebehind. That part works fine. It's when I select various items and submit that I have trouble. My handler loops through the listbox items but doesn't see any as being selected. I'm not sure why. Here's the markup: <asp:Panel ID="panEdit" runat="server" Height="180px" Width="400px" CssClass="ModalWindow"> <table width="100%"> <asp:label runat = "server">Choose your items</asp:label> <tr> <td> <asp:ListBox ID="lstFundList" runat="server" SelectionMode="Multiple" OnLoad="lstFundList_LoadData"> </asp:ListBox> </td> </tr> </table> <asp:Button ID="btnUpdate" runat="server" Text="Update" OnClick="btnUpdate_OnClick"/> <asp:Button ID="btnCancel" runat="server" Text="Cancel" OnClientClick="$find('ModalPopupExtender1').hide(); return false;" /> </asp:Panel> In my btnUpdate_OnClick handler I can't see any listbox items that are marked as selected. I assume something strange is going on with respect to postback and the panel?

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Passing Derived Class Instances as void* to Generic Callbacks in C++

- by Matthew Iselin

This is a bit of an involved problem, so I'll do the best I can to explain what's going on. If I miss something, please tell me so I can clarify. We have a callback system where on one side a module or application provides a "Service" and clients can perform actions with this Service (A very rudimentary IPC, basically). For future reference let's say we have some definitions like so: typedef int (*callback)(void*); // This is NOT in our code, but makes explaining easier. installCallback(string serviceName, callback cb); // Really handled by a proper management system sendMessage(string serviceName, void* arg); // arg = value to pass to callback This works fine for basic types such as structs or builtins. We have an MI structure a bit like this: Device <- Disk <- MyDiskProvider class Disk : public virtual Device class MyDiskProvider : public Disk The provider may be anything from a hardware driver to a bit of glue that handles disk images. The point is that classes inherit Disk. We have a "service" which is to be notified of all new Disks in the system, and this is where things unravel: void diskHandler(void *p) { Disk *pDisk = reinterpret_cast<Disk*>(p); // Uh oh! // Remainder is not important } SomeDiskProvider::initialise() { // Probe hardware, whatever... // Tell the disk system we're here! sendMessage("disk-handler", reinterpret_cast<void*>(this)); // Uh oh! } The problem is, SomeDiskProvider inherits Disk, but the callback handler can't receive that type (as the callback function pointer must be generic). Could RTTI and templates help here? Any suggestions would be greatly appreciated.

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WPF RadioButton selected in UI, but seen by code as IsChecked == false

- by Mike

I have some radio buttons in a group box. I select the buttons randomly, and all works perfectly from a visual standpoint and also the event handler is called each time a new button is selected. Now I have a dependency property with a callback when the value changes. When in this callback procedure I read the IsChecked value of any button, the value is False, in spite the button is visually selected (they are all false at the same time, strange). The debugger also displays all buttons unchecked. Hu hu, I'm lacking ideas about the reason, after the basic verifications... <GroupBox> <StackPanel> <RadioButton x:Name="btNone" Content="Disconnected" IsChecked="True" Checked="OnSelChecked"/> <RadioButton x:Name="btManual" Content="Manual" Checked="OnSelChecked"/> </StackPanel> </GroupBox> Event handler: private void OnSelChecked(object sender, RoutedEventArgs e) { if (btManual.IsChecked == true) { // is called } } Dependency property: public static readonly DependencyProperty ManualProperty = DependencyProperty.Register("Manual", typeof(Position), typeof(SwitchBox), new FrameworkPropertyMetadata(null, FrameworkPropertyMetadataOptions.AffectsRender, new PropertyChangedCallback(OnManualChanged))); Dependency property callback: private static void OnManualChanged(DependencyObject sender, DependencyPropertyChangedEventArgs args) { SwitchBox box = sender as SwitchBox; if (box.btManual.IsChecked == true) { // never true, why?? } }

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Building a TriggerField with PopUp Window

- by umit_alba

Hi! I built a triggerField and when i press at it, i want to have a popup, that is appended to the button in the triggerfield(so when i click anywhere else it shall disappear and it shall pop out up to the button when i click at the button just like a datepicker-popup) I somehow managed to do something like that with an Ext.window but the offset and postion doesnt match. This all should be contained in a row editor. my Code: new Ext.grid.GridPanel({ store: Store, region:'center', height:150, //minWidth:700, autoScroll:true, listeners:{}, plugins:[new Ext.ux.grid.RowEditor()], tbar: [{ iconCls: 'icon-user-add', text: ' hinzufügen', handler: function(){ alert("abc"); } },{ ref: '../removeBtn', iconCls: 'icon-user-delete', text: 'löschen', disabled: true, handler: function(){ editor.stopEditing(); var s = grid.getSelectionModel().getSelections(); for(var i = 0, r; r = s[i]; i++){ store.remove(r); } } }], columns: [{ header: 'Monate', dataIndex: 'MONAT', width: 50, sortable: true, editor: new Ext.form.TriggerField({"id":"EditorMonate",items:[], "onTriggerClick":function(thiss){ if(!Ext.getCmp("autoWMonate")){ var monate=new Ext.Window({"x":Ext.getCmp("EditorMonate").x,closeAction:"hide",width:275,id:"autoWMonate",layout:"table",layoutConfig: {columns: 10}}); var text; for(var mon=1;mon<13;mon++){ text=mon; mon?mon:text="0"; if(mon<10) text="0"+mon; monate.items.add( new Ext.Button({cls:"x-btn",value:parseInt(text),selected:true,"text":text,id:text }}}));} } Ext.getCmp("autoWMonate").hidden?Ext.getCmp("autoWMonate").show():Ext.getCmp("autoWMonate").hide(); }}) } }] })

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SAX Parser Exceprtion

- by sairam333

When I run my application the following error willl be occured some times only,Can u explain why it is occured some times only and what i sthe solution for this and the error message is 03-13 14:38:18.055: WARN/System.err(1866): org.xml.sax.SAXParseException: expected: '' actual: '?' (position:END_TAG @137:35 in java.io.StringReader@438e0ef0) 03-13 14:38:18.064: WARN/System.err(1866): at org.apache.harmony.xml.parsers.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:151) 03-13 14:38:18.074: WARN/System.err(1866): at com.fitzengineering.teslaworldnet.interfacelayer.ParseXMLString.convertPeoples(ParseXMLString.java:484) 03-13 14:38:18.074: WARN/System.err(1866): at com.fitzengineering.teslaworldnet.presentationlayer.People.onCreate(People.java:91) 03-13 14:38:18.074: WARN/System.err(1866): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1123) 03-13 14:38:18.084: WARN/System.err(1866): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2231) 03-13 14:38:18.095: WARN/System.err(1866): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2284) 03-13 14:38:18.104: WARN/System.err(1866): at android.app.ActivityThread.access$1800(ActivityThread.java:112)03-13 14:38:18.104: WARN/System.err(1866): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1692) 03-13 14:38:18.114: WARN/System.err(1866): at android.os.Handler.dispatchMessage(Handler.java:99) 03-13 14:38:18.124: WARN/System.err(1866): at android.os.Looper.loop(Looper.java:123) 03-13 14:38:18.134: WARN/System.err(1866): at android.app.ActivityThread.main(ActivityThread.java:3948) 03-13 14:38:18.134: WARN/System.err(1866): at java.lang.reflect.Method.invokeNative(Native Method) 03-13 14:38:18.144: WARN/System.err(1866): at java.lang.reflect.Method.invoke(Method.java:521) 03-13 14:38:18.144: WARN/System.err(1866): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:782) 03-13 14:38:18.154: WARN/System.err(1866): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:540) 03-13 14:38:18.154: WARN/System.err(1866): Thanks in advance

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Catching / blocking SIGINT during system call

- by danben

I've written a web crawler that I'd like to be able to stop via the keyboard. I don't want the program to die when I interrupt it; it needs to flush its data to disk first. I also don't want to catch KeyboardInterruptedException, because the persistent data could be in an inconsistent state. My current solution is to define a signal handler that catches SIGINT and sets a flag; each iteration of the main loop checks this flag before processing the next url. However, I've found that if the system happens to be executing socket.recv() when I send the interrupt, I get this: ^C Interrupted; stopping... // indicates my interrupt handler ran Traceback (most recent call last): File "crawler_test.py", line 154, in <module> main() ... File "/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/socket.py", line 397, in readline data = recv(1) socket.error: [Errno 4] Interrupted system call and the process exits completely. Why does this happen? Is there a way I can prevent the interrupt from affecting the system call?

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The uncatchable exception, pt 2

- by chaiguy

Ok I've done some testing and I've reduced the problem to something very simple: i. Create a method in a new class that throws an exception: public class Class1 { public void CallMe() { string blah = null; blah.ToLower(); } } ii. Create a MethodInfo that points to this method somewhere else: Type class1 = typeof( Class1 ); Class1 obj = new Class1(); MethodInfo method = class1.GetMethod( "CallMe" ); iii. Wrap a call to Invoke() in a try/catch block: try { method.Invoke( obj, null ); // exception is not being caught! } catch { } iv. Run the program without the debugger (works fine). v. Now run the program with the debugger. The debugger will halt the program when the exception occurs, even though it's wrapped in a catch handler that tries to ignore it. (Even if you put a breakpoint in the catch block it will halt before it reaches it!) In fact, the exception is happening when you run it without the debugger too. In a simple test project it's getting ignored at some other level, but if your app has any kind of global exception handling, it will get triggered there as well. This is causing me a real headache because it keeps triggering my app's crash-handler, not to mention the pain it is to attempt to debug.

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jQuery AJAX with two domains

- by Andrew Burns

OK here is the situation: I have an externally hosted CMS which works great for 99% of our needs. However on the more advanced things I inject my own CSS+JS and do magic. The problem I am running into is loading a simple HTML page from jQuery.ajax() calls. It appears to work in the sense that no warnings or errors are thrown; however in my success handler (which IS ran), the response is blank! I have been scratching my head for the whole morning trying to figure this out and the only thing I can think of is that is has something to do with the cross domain issue (even though it appears to work). Injected JavaScript: $(document).ready(function() { doui(); }); function doui() { $.ajax({ url: 'http://apps.natronacounty-wy.gov/css/feecalc/ui.htm', cache: false, success: ajax_createUI, charset: "utf-8", error: function(e) { alert(e); } }); } function ajax_createUI(data, textStatus) { alert(data); $("#ajax-content").html(data); } My ajax_createUI() success handler is called and textStatus is "success"; however data is empty. This JS file resides @ http://apps.natronacounty-wy.gov/css/js/feecalc.js however the CMS website (which gets the JS injected into it) resides @ http://www.natronacounty-wy.gov/ Am I just being stupid or is it a bug that it looks like it should be working but isn't?

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Delayed_job not executing the perform method but emptying the job queue

- by James

I have a fresh rails 3 app, here's my Gemfile: source 'http://rubygems.org' gem 'rails', '3.0.0' gem 'delayed_job' gem 'sqlite3-ruby', :require = 'sqlite3' Here's the class that represents the job that I want to queue: class Me < Struct.new(:something) def perform puts "Hello from me" logger.info "Hello from me" logger.debug "Hello from me" raise Exception.new end end From the console with no workers running: irb(main):002:0> Delayed::Job.enqueue Me.new(1) => #<Delayed::Backend::ActiveRecord::Job id: 7, priority: 0, attempts: 0, handler: "--- !ruby/struct:Me \nsomething: 1\n", last_error: nil, run_at: "2010-12-29 07:24:11", locked_at: nil, failed_at: nil, locked_by: nil, created_at: "2010-12-29 07:24:11", updated_at: "2010-12-29 07:24:11"> Like I mentioned: there are no workers running: irb(main):003:0> Delayed::Job.all => [#<Delayed::Backend::ActiveRecord::Job id: 7, priority: 0, attempts: 0, handler: "--- !ruby/struct:Me \nsomething: 1\n", last_error: nil, run_at: "2010-12-29 07:24:11", locked_at: nil, failed_at: nil, locked_by: nil, created_at: "2010-12-29 07:24:11", updated_at: "2010-12-29 07:24:11">] I start a worker with script/delayed_job run The queue gets emptied: irb(main):006:0> Delayed::Job.all => [] However, nothing happens as a result of the puts, nothing is logged from the logger calls, and no exception is raised. I'd appreciate any help / insight or anything to try.

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Avoiding a fork()/SIGCHLD race condition

- by larry

Please consider the following fork()/SIGCHLD pseudo-code. // main program excerpt for (;;) { if ( is_time_to_make_babies ) { pid = fork(); if (pid == -1) { /* fail */ } else if (pid == 0) { /* child stuff */ print "child started" exit } else { /* parent stuff */ print "parent forked new child ", pid children.add(pid); } } } // SIGCHLD handler sigchld_handler(signo) { while ( (pid = wait(status, WNOHANG)) > 0 ) { print "parent caught SIGCHLD from ", pid children.remove(pid); } } In the above example there's a race-condition. It's possible for "/* child stuff */" to finish before "/* parent stuff */" starts which can result in a child's pid being added to the list of children after it's exited, and never being removed. When the time comes for the app to close down, the parent will wait endlessly for the already-finished child to finish. One solution I can think of to counter this is to have two lists: started_children and finished_children. I'd add to started_children in the same place I'm adding to children now. But in the signal handler, instead of removing from children I'd add to finished_children. When the app closes down, the parent can simply wait until the difference between started_children and finished_children is zero. Another possible solution I can think of is using shared-memory, e.g. share the parent's list of children and let the children .add and .remove themselves? But I don't know too much about this. EDIT: Another possible solution, which was the first thing that came to mind, is to simply add a sleep(1) at the start of /* child stuff */ but that smells funny to me, which is why I left it out. I'm also not even sure it's a 100% fix. So, how would you correct this race-condition? And if there's a well-established recommended pattern for this, please let me know! Thanks.

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Getting auth token for dropbox account from accountmanager in android

- by user1490880

I am trying to get auth token for a dropbox account configured in device from account manager. I am using accountManager.getAuthToken(account, "DROPBOX",null,Hello.this, new GetAuthTokenCallback(), null);//account" is dropbox account I am seeing a Allow/Deny page. I click on Allow, but the callback is not getting invoked at all and i dont get the auth token. I got the authtoken for a google account with this(with a different authtokentype). What i am missing. I am not sure about the authTokenType parameter for dropbox. Also are there any other parameter specific for dropbox like the bundle parameter that i am missing. Is this way possible for dropbox? Check below for the function parameters public AccountManagerFuture<Bundle> getAuthToken (Account account, String authTokenType, Bundle options, Activity activity, AccountManagerCallback<Bundle> callback, Handler handler) Link: http://developer.android.com/reference/android/accounts/AccountManager.html UPDATE I assume since we are able to create a dropbox account in android Accounts and Sync(Settings), there must be a dropbox authenticator that has all the functions in AbstractAccountAuthenticator implemented including getAuthToken(). So dropbox should support giving auth token i think. Also dropbox uses oauth1, whereas account manager uses outh 2.0. So is this an issue.Can anyone comment on this?

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Very strange Application.ThreadException behaviour.

- by Brann

I'm using the Application.ThreadException event to handle and log unexpected exceptions in my winforms application. Now, somewhere in my application, I've got the following code (or rather something equivalent, but this dummy code is enough to reproduce my issue) : try { throw new NullReferenceException("test"); } catch (Exception ex) { throw new Exception("test2", ex); } I'm clearly expecting my Application_ThreadException handler to be passed the "test2" exception, but this is not always the case. Typically, if another thread marshals my code to the UI, my handler receives the "test" exception, exactly as if I hadn't caught "test" at all. Here is a short sample reproducing this behavior. I have omitted the designer's code. static class Program { [STAThread] static void Main() { Application.ThreadException += new System.Threading.ThreadExceptionEventHandler(Application_ThreadException); Application.EnableVisualStyles(); Application.SetCompatibleTextRenderingDefault(false); Application.Run(new Form1()); } static void Application_ThreadException(object sender, System.Threading.ThreadExceptionEventArgs e) { Console.WriteLine(e.Exception.Message); } } public partial class Form1 : Form { public Form1() { InitializeComponent(); button1.Click+=new EventHandler(button1_Click); System.Threading.Thread t = new System.Threading.Thread(new System.Threading.ThreadStart(ThrowEx)); t.Start(); } private void button1_Click(object sender, EventArgs e) { try { throw new NullReferenceException("test"); } catch (Exception ex) { throw new Exception("test2", ex); } } void ThrowEx() { this.BeginInvoke(new EventHandler(button1_Click)); } } The output of this program on my computer is : test ... here I click button1 test2 I've reproduced this on .net 2.0,3.5 and 4.0. Does someone have a logical explanation ?

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