exception-handling

问题 I have a module in which I am performing all of my encryption/decryption tasks for a project. I would like to catch any OpenSSL::Cipher::CipherError exceptions that occur in this module so that I can handle them. Is it possible to do something like rescue_from OpenSSL::Cipher::CipherError, :with => :cipher_error inside of a module? 回答1: I've investigated a little and came with a solution. You said you have a module in which you do your encryption. I'm guessing that module represents a

问题 I am creating a java application in which there is a possibility that exceptions might be thrown. I am handling these exceptions in a try-catch block and printing appropriate messages so that the business users don't have to see the ugly stack trace in case of a failure. But now when I debug, I would like to invoke the JAR file in such a way that it will print the stack traces for me, so that I can know where exactly the problem lies. Can someone enlighten me on how this can be achieved? 回答1:

问题 When i get this error: QueryException in Connection.php line 620: SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry can i handle it with my own flash error message instead of: Whoops, looks like something went wrong 回答1: You have two ways to handle exceptions and show a custom response: 1) Let the framework handle them for you: If you don't handle exceptions by yourself, Laravel will handle them in the class: App\Exceptions\Handler In the render method you can intercept

问题 I have a ruby code like this: begin doc = Nokogiri::HTML(open(url).read.strip) rescue Exception => ex log.error "Error: #{ex}" end And I am getting log as: ERROR -- : Error: execution expired I want block re-execute until it success. How can I do it? 回答1: I'll expand on my comment a little bit. You can use retry to go back to the begin : begin doc = Nokogiri::HTML(open(url).read.strip) rescue Exception => ex log.error "Error: #{ex}" retry end That will keep trying (and logging errors) until

问题 I'm unsure about two possibilities to react to an event in my code. Mostly I'm concerned about which one needs less resources. I have a method with an observer registered to an eventproducer . If the eventproducer returns something, the method exits and the caller of the method starts the method again (you can think of it as a kind of a long polling). The eventproducer sometimes fires lots of events per seconds and sometimes rests for minutes. The first approach was to await a delay of 500ms

问题 For some reason my exceptions arent being thrown anymore in Visual Studio. I get the error in JSON on the response, but Visual Studio in debug mode no longer throws an error and stops Visual Studio at that error when it happens. I have looked into posts like this: Visual Studio not stopping on an exception being thrown But I just want to reset where I was before, not enable exceptions one by one. 回答1: To reset the exceptions settings, go to Debug>Exceptions and click "Reset All." You can also

问题 For some reason my exceptions arent being thrown anymore in Visual Studio. I get the error in JSON on the response, but Visual Studio in debug mode no longer throws an error and stops Visual Studio at that error when it happens. I have looked into posts like this: Visual Studio not stopping on an exception being thrown But I just want to reset where I was before, not enable exceptions one by one. 回答1: To reset the exceptions settings, go to Debug>Exceptions and click "Reset All." You can also

问题 I have a bit of JavaScript (Jquery Tools' Overlay) which may throw an exception when dropped on a page that uses it incorrectly, and I'm trying to handle it gracefully. I have a general window.onerror handler to rescue these errors and report them back to the server, however that's not getting triggered. I also cannot wrap a try/catch around this code, as it's being included as a remote script in HTML. Any ideas on how you can rescue errors that an external script throws? UPDATE : Here's the

问题 All the docs tell us is, Raised when the user hits the interrupt key (normally Control-C or Delete ). During execution, a check for interrupts is made regularly. But from the point of the code, when can I see this exception? Does it occur during statement execution? Only between statements? Can it happen in the middle of an expression? For example: file_ = open('foo') # <-- can a KeyboardInterrupt be raised here, after the successful # completion of open but prior to the try? --> try: # try

问题 I am doing some exception handling for code which is writing to the StandardInput stream of a Process object. The Process is kind of like the unix head command; it reads only part of it's input stream. When the process dies, the writing thread fails with: IOException The pipe has been ended. (Exception from HRESULT: 0x8007006D) I would like to catch this exception and let it fail gracefully, since this is expected behavior. However, it's not obvious to me how this can robustly be