exception-handling

问题 This question refers to an answer here. I need to access message of a custom exception. Is this possible? I thought that directly calling message will suffice as in this example: class MyCustomError < StandardError attr_reader :object def initialize(object) @object = object puts message end end but this is not what I expected it to be. It gave me some string like: "MyModuleNameHere::MyCustomExceptionClassNameHere" instead of: "a message" My intuition is leaning towards no, since the

问题 I am trying to write a program to ask a user to enter their age and prompt them to re-enter if they enter an improper value (such as a negative number, older than 120, an age with special characters or letters, an out of range number etc...) I tried writing a try/catch to ask the user to re-enter their age: System.out.println("Enter your age (a positive integer): "); int num; try { num = in.nextInt(); while (num < 0 || num > 120) { System.out.println("Bad age. Re-enter your age (a positive

问题 Can somebody explain to me why my error is not thrown in my first example? And why it is when I use process.nextTick() ? var deferred = require('deferred'); // This code does not work. // Error seems to never been thrown and script kind of freeze without saying anything. deferred.resolve().then(function(){ console.log('deferred resolved'); throw new Error('Synchronous error thrown in deferred.then()'); }); // This code does work. // I just embedded the throw in the process.nextTick() method.

问题 Suppose i have this code if form.is_valid(): form.save() Now suppose my form is valid i have exception that foregin key value is linked to more than one column so it will raise exception Now i want to know is there any way to grab that exception value and pass to jquery via AJAX Because form is valid so it comes inside the loop but its not able to go after form.save So how can i program that if exception occurs it get passed to jquery like if exception return HttpResponse(exception) I get

问题 public static void parseUpload(HttpServletRequest request) throws AttachmentException { if (ServletFileUpload.isMultipartContent(request)) { DiskFileItemFactory factory = new DiskFileItemFactory(); factory.setSizeThreshold(10 * 1024 * 1024); // 10 MB ServletFileUpload uploader = new ServletFileUpload(factory); uploader.setSizeMax(3 * 1024 * 1024); // allowed file size uploader.setFileSizeMax(3 * 1024 * 1024); List<FileItem> items; try { items = uploader.parseRequest(request); // throws

问题 I am creating designer where user can drag controls to surface. Some controls in toolbar can contains broken logic and generate exceptions. When user drags broken items to surface i have unhandled exception. I want to suppress this UI exception and show message like blend or visual studio: workArea.Dispatcher.UnhandledException += MainContainerDispatcherUnhandledException I can cache this exception like this: protected void MainContainerDispatcherUnhandledException(object sender, System

问题 I've been thinking about nested try/catch statements and started to think about under which conditions, if any, the JIT can perform an optimization or simplification of the compiled IL. To illustrate, consider the following functionally-equivalent representations of an exception handler. // Nested try/catch try { try { try { foo(); } catch(ExceptionTypeA) { } } catch(ExceptionTypeB) { } } catch(ExceptionTypeC) { } // Linear try/catch try { foo(); } catch(ExceptionTypeA) { } catch

问题 Related to the topic Perl: Force stacktrace for "can't call method on undefined" I have the following followup question: I'm using Perl and Catalyst as Web-Framework and I want to get a stacktrace for ANY exception (for some there are already stacktraces but not for all, see linked question). As suggested in the linked question, the solution is to insert use Carp::Always; "somehwere in the code". Inserting use Carp::Always; in the Catalyst main package file MyApp.pm (where all the

问题 I'm trying to convert my app to Instant app . I create the base module but my manifest giving some error. I tried a lot. Is this is a plugin error or any third party library issue which I am using? I am attaching here my Manifest file of base module and app module . Please help me to resolve this issue. ManifestFileOFBaseModule: `<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" package=

问题 void _general_exception_handler (unsigned caused, unsigned status) { RCON = RCON_EXCEPTION; // Point of No return. Kernel_Reset(); } My code seems to be getting in this trap and I have few questions to figure out why it get here from calling valid functions in my code or the better question that keeps bothering me is how does the processor know there has been a violation. 1) When I look in the watch window in the debugger, the cause shows me Address 0xA0007EC0 and the value 0x10800C1C and the