exception-handling

问题 The javascript, when run through JSLint yells at me and I am not sure why. /*jslint browser: true, devel: true, evil: true, undef: true, nomen: true, eqeqeq: true, plusplus: true, bitwise: true, newcap: true, immed: true */ var foo = function() { try { console.log('foo'); } catch(e) { alert(e); } try { console.log('bar'); } catch(e) { alert(e); } }; foo(); It tells me: Problem at line 12 character 11: 'e' is already defined. } catch(e) { It appears to be upset that I have a second catch(e) .

问题 I am a beginner in both java and android. I am using asynchronous task in my project to fetch some data from a web service, faced some problems in exception handling. I referred this SO question and I am following the pattern suggested by CommonsWare in this link. I succeeded in catching the exceptions and storing it in an exception variable. I need to compare the caught exception against some standard exceptions in onPostExecute method also I would like to display custom error messages based

问题 Hi guys I'm working with Zend framework and just hate the fact that I seem to encounter hundreds of exception errors like if I try to reference a non existant property of an object my application just dies and crashes. However I have no idea where to see these errors or how to be able to display them on screen. I've set display errors to true and error reporting to E_ALL but when an error is thrown all I see is a blank page rendered only until a bit before where the error apparently occurred

问题 Thread.UncaughtExceptionHandler states that when the method which handles uncaught exceptions itself throws an exception, that exception will be ignored: void uncaughtException (Thread t, Throwable e): Method invoked when the given thread terminates due to the given uncaught exception. Any exception thrown by this method will be ignored by the Java Virtual Machine. However when I tested it, the JVM did not ignore the exceptions handled by the uncaught exception handler`: public static void

问题 I am getting binding exception while starting the Tomcat server. I tried to kill the process that which is using '80' as couple of processes are using it. Getting error, while killing process id is '0': ERROR: The process with PID 0 could not be terminated. Reason: This is critical system process. Taskkill cannot end this process. How to fix this? I don't need to use another port to run the tomcat server. 回答1: Setting Tomcat to listen to port 80 is WRONG , for development the 8080 is a good

问题 I heard from some people that in Scala we tend (like other functional languages) to not break the control flow... Instead by convention we return the error in an Either Left . But how do we get the stracktrace from that exception? For now i return in the Left a simple Error case class with a code, message and cause ( Error too). But if i have an error, i can't get the stacktrace. If my application become complexe it may be hard to find the code block that returned that Error ... The root

问题 According to the .NET Framework General Reference: Error Raising and Handling Guidelines exceptions should not be thrown during 'normal' operations. Is invalid user input to a web form, say the user enters a duplicate name, considered normal? !! IMPORTANT !!: I'm sure we pretty much all have an opinion on this, please include a reference to a reliable source. EDIT: A little more background: I'm questioning the approch to model validation advocated by a book I'm reading. The book is suggesting

问题 Which of the following exception notification solutions is the best? Exceptional Hoptoad exception_notification exception_logger 回答1: I use hoptoad and have had nothing but a positive experience, I highly recommend it. 回答2: On a high traffic site we use an internal messaging queue for errors, then pump those back up to hoptoad. Not a massive fan of hoptoad, it's too easy to ignore messages. The internal queue makes it nice and easy to change service if we need to, and prevents our app from

问题 I can check for the input and if it's an invalid input from the user, I can use a simple "if condition" which prints "input invalid, please re-enter" (in case there is an invalid input). This approach of "if there is a potential for a failure, verify it using an if condition and then specify the right behavior when failure is encountered..." seems enough for me. If I can basically cover any kind of failure (divide by zero, etc.) with this approach, why do I need this whole exception handling

问题 If you want to add an extra check not provided by argparse , such as: if variable a == b then c should be not None ...is it permissible to raise ArgumentError yourself? Or, should you raise Exception instead? Also what is common practice for this kind of situation? Say that you add a piece of code that's almost like a local extension of the library. Should you use the same exception type(s) as those provided by the library you are extending? 回答1: There's nothing inherently wrong with raising