exception-handling

问题 Before my main phing task runs, it first checks that all required properties have been set. If a property is missing or invalid, it calls a FailTask to end execution - which works. <if> <equals arg1="${build.db.host}" arg2="" /> <then> <fail msg="build.db.host is empty." /> </then> </if> Alas, the FailTask throws a BuildException (with the msg), which throws an 'error in IfTask' - both of which are displayed twice, with their backtraces, giving me a 60-line screen dump for a one line message!

问题 I am in the process of getting to grips with the Golang way of doing things. I'd be much obliged to anyone who might be able to help with the following. First some sample code package main import ( "log" "os" ) func logIt(s string) { f, _ := os.OpenFile("errors.log", os.O_RDWR|os.O_CREATE|os.O_APPEND, 0666) defer f.Close() log.SetOutput(f) log.Println(s) } type iAm func(string) func a(iam string) { logIt(iam + " A") } func b(iam string) { logIt(iam + " B") } func c(iam string) { logIt(iam + "

问题 I am developping an single page app with angularjs and Spring Mcv Rest. I am calling my service (mail sending with javax mail) like that in Angularjs : SendProformaFax.get({idCommande:$scope.commande.id}) And on server side my service : @RequestMapping(value = "/sendProformaFax/{idCommande}", method = RequestMethod.GET, produces = MediaType.APPLICATION_JSON_VALUE) @Timed public void imprimeProforma(@PathVariable String idCommande) { Commande commande = commandeRepository.findOne(new Long

问题 Even though I can capture the exception raised from @post.save and log the error and print the threads begin if @post.save rescue Exception => ex # rescue Errno::ECONNREFUSED => ex Thread.list.each {|t| p t} Rails.logger.error "ERROR: Could not save blog post! Is the Solr server up and running? Exception: #{ex}" it still errors out on the web page and doesn't show any of my code in the stack trace. The solr Sunspot model callback is running on a separate thread. rsolr (1.0.9) lib/rsolr

问题 I am creating a Spring Boot web application, but i am confused why people use Global Exception handlers(@ControllerAdvice) when there is Error Page Registrar which is neater and more explicit. Please can someone explain more and is it possible to call an Error page registrar from a global Exception Handler Class( class annoted with @ControllerAdvice, with an @Exceptionhandler method). 回答1: As Brian answer, I think you can do this. I got a sample to prove this one in here if you still need to

问题 As a project gets bigger and bigger, I get a bit confused as to what types of exceptions should be thrown and where they should be caught, e.g. how to organize internal exceptions vs exception messages that should be shown to the end user. To keep confusion down, is it best practice to always catch an exception in the higher-level object? Take this example: if I have a database class that inserts a row into the database, and that class is called by another object that processes data, and in

问题 As far as I know, you are supposed to only use try/catch when you will actually handle the exception and not just report&log it and then crash the application. Otherwise, you are better off just checking different scenarios where it makes sense (e.g. if sth==null) or - if your purpose is just to log the exception and crash the application - to use AppDomain.UnhandledException. But is this always the case and why? Suppose the following method, which accepts an array and returns MemoryStream

问题 my problem is that I have a project developed in visual Studio .NET 4.0 and it must have compatibility with Mono. MoMa tool says that there's no problem. When I try to run the tests with NUnit Mono 2.0 Profile says to me the next exception: System.MissingMethodException... at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke (System.Runtime.Remoting.Proxies.RealProxy rp, IMessage msg, System.Exception& exc, System.Object[]& out_args) [0x00000] in <filename unknown>:0 I have Mono 2.10

问题 I want to know whether is it a good idea to catch exception based on unique index of sql in java. i want to catch an exception like 'duplicate entry for 1-0' if so then handle exception otherwise insert properly in database table? 回答1: I say you don't do that, for two reasons: the error messages are a bit unclear: ERROR 1062 (23000): Duplicate entry 'xxx' for key 1 . Are you always 100% sure which key is 1? it locks in you to a specific database vendor I find it simpler to transactionally :

问题 I can currently handle CTRL + C via: def hand_inter(signum, frame): print 'hey, nice job.' signal.signal(signal.SIGINT, hand_inter) However I am required to also handle CTRL + D yet cannot find the appropriate "signal.CTRL+D" call for signum. 回答1: Ctrl + D is not a signal, it's end of file. If you have an interactive program, you will be most probably reading STDIN and Ctrl + D is way how user says that the input is over. Outside this context it does not have any special meaning. The code