exception-handling

问题 Developer Exception Page ( app.UseDeveloperExceptionPage() ) is blank if added to IApplicationBuilder after MVC ( app.UseMvc() ) in Startup.cs Configure method. Developer Exception Page works fine if added before MVC. Is this behavior intentional or am doing something wrong? Visual Studio Code 0.10.6 on Mac Microsoft.AspNet.Diagnostics 1.0.0-rc1-final Microsoft.AspNet.Mvc 6.0.0-rc1-final DNX Mono 1.0.0-rc1-update1 回答1: The behavior you're seeing is TOTALLY intentional : in ASP.NET 5,

问题 I'm trying to handle loading invalid YAML data in Ruby, but seem to be unable to rescue exceptions raised by psych. This is some example code to demonstrate the issue I'm having: require 'yaml' begin YAML.load('&*%^*') rescue puts "Rescued" end And the exception: # ruby test.rb /usr/lib64/ruby/1.9.1/psych.rb:203:in `parse': (<unknown>): did not find expected alphabetic or numeric character while scanning an anchor at line 1 column 1 (Psych::SyntaxError) from /usr/lib64/ruby/1.9.1/psych.rb:203

问题 I am a c++ developer and I am pretty new with the checked and unchecked exception in java. The exception specifications in c++ are simply not good and that's why nobody is using it. I like the checked exception and I have a question, let's have this interface: public interface Warehouse { MyStuff fetch(int id); } The warehouse can be implemented in different way: file, database or in memory (mock object for test). Now, if I want to implement using a file, I cannot try to open the file in the

问题 I was recently asked a question, apparently in an Interview, about extending the java.lang.RuntimeException. I was asked to cite an example where there would be a need to extend the java.lang.RuntimeException. I always thought that we would not need to extend the RuntimeException, can anybody enlighten me? Thanks, SB 回答1: One layer's runtime exception is another layer's checked (and acted upon) exception. I can see containers e.g. servlet container; REPLs and/or anything top-level interpreter

问题 In the VS debugger, un-caught exceptions result in the program breaking at the point the exception is throw (or near enough) and in a state that lets you look at all the stack frames and there local variables up to that point. Is there a way to get this same result (break at throw) but for an exception is caught at a particular point? I'm not interested in doing this for ALL exceptions or even all exception of a given type (that could get useless real quick) but if I could do it for a single

问题 Typically one uses ExceptionMapper to catch exceptions, log them, return a customized error messages. However while JAX-RS provides an NotFoundException in its api, the implementations (Jeresy, CXF,...) provide their own NotFoundException (such as com.sun.jersey.api.NotFoundException ) which doesn't extends the JAX-RS one. Leaving us with the sole option of having in our code implementation specific imports. This makes it hard if one wants to switch implementations. Is there another way to do

问题 I'm using Perl and Catalyst as Web-Framework. How can I globally force a stacktrace if an exception like Can't call method "XXX" on an undefined value... is thrown? Suppose the following code in your Controller/Root.pm use DateTime; sub test :Local :Args(0) { my ( $self, $c ) = @_; my $now = DateTime->now(time_zone=>'local'); my $tmp = undef; my $throwing = $tmp - $now; #this will throw an exception! $c->res->body("OK"); } Opening http://localhost:3000/test throws of course the exception:

问题 I have created the following class for Inputting a user's age and then displaying appropriate info in the console. On running this program , the console asks "Please Enter your Age : " If the user enters an Integer for eg: 25 , the executed class displays " Your age is : 25" in the console. If the user enters a non-integer number , the console displays: Age should be an Integer Please Enter your Age: But I am not able to enter anything through the keyboard when I place my cursor next to

问题 The question is if it is prefered to Throw an exception or to prevent it from ever occurring. It is for a game project. IndexOutOfBoundsException vs. coding around it. I have a List<E> private Attribute<List> attributes; A method to get an item by index. public Attribute getAttribute (int index) { if (index < 0 || index >= attributes.size()) index = 0; return attributes.get(index); } In this case I am defaulting to the 1st element of the list. 回答1: Failing fast is generally a good idea: if an

问题 My scenario: Windows Service .NET 4 I poll a database for entities. When new entities come in they are added to a BlockingCollection . In the service's OnStart I create a System.Threading.Tasks.Task whose job is to enumerate the BlockingCollection (using GetConsumingEnumerable() ). The problem I'm having is this: When an unhandled exception occurs in the task, I want the exception logged and the service stopped. I can't catch exceptions from the task unless I call Task.Wait() . If I call Task