catch-block

try .. catch with system() command php on laravel 5.0

由 泪湿孤枕 提交于 2019-12-12 00:43:22
问题 I've a code for command app made on laravel 5.0 with try .. catch and use system command. When there a exception, my catch not work. use Illuminate\Support\Facades\Log; ... try { system('.dump master | sqlite3 ' . $older . ' > ' . storage_path() . '/tmp/' . $tabla . '.sql' ); } catch ( \Exception $e) { Log::alert('Problem import old table '. $tabla . $e->GetMessage()); } I see my error on shell but not write on my own laravel log. (Log:alert) 回答1: You have to gain access over STDERR and,

Java: Can catch blocks be polymorphic?

由 梦想与她 提交于 2019-12-10 18:17:17
问题 In a paper I'm going over for a repeat exam, I'm asked "Can catch blocks be polymorphic?". If true, it doesn't make sense to me to call multiple catch blocks polymorphic. Is it polymorphism if catch blocks cannot be named and only contain parameters in their method header? For example: try { //... } catch (FileNotFoundException e) { System.err.println("FileNotFoundException: " + e.getMessage()); throw new SampleException(e); } catch (IOException e) { System.err.println("Caught IOException: "

Is there a situation when it's appropriate to use empty catch block? [duplicate]

由 北战南征 提交于 2019-12-08 15:30:28
问题 This question already has answers here : Closed 8 years ago . Possible Duplicates: Why are empty catch blocks a bad idea? Is there any valid reason to ever ignore a caught exception Do you know any situations when an empty catch block is not the absolute evil? try { ... // What and When? ... } catch { } 回答1: There are a lot of questions on this, try to look at: Why are empty catch blocks a bad idea? From that post's accepted answer: Usually empty try-catch is a bad idea because you are

try-catch block in Java - execution statements in catch code

由 独自空忆成欢 提交于 2019-12-07 04:29:29
问题 I have a question about the order of the execution of statements in a catch block in Java. when I run the following class Test1 (see below), I expect to have as output first Hi!, then the result of the e.printStackTrace(); statement, and then Bye!. However, I never get this order. Please, look at the outputs, which I have pasted below. public class Test1 { public static void calculate() { try { int h = 5/0; } catch (ArithmeticException e) { System.out.println("Hi!"); e.printStackTrace(); }

.net Exception catch block

由 China☆狼群 提交于 2019-12-05 01:27:09
What's the difference between the following catch blocks? try { ... } catch { ... } and try { ... } catch(Exception) { ... } I realize, in either case, the exception instance is not available but is there anything that I can do with one that is not possible with the other? They are almost the same. From the C# Language Specification, section 8.10: Some programming languages may support exceptions that are not representable as an object derived from System.Exception, although such exceptions could never be generated by C# code. A general catch clause may be used to catch such exceptions. Thus,

Catching exceptions in Java

由 主宰稳场 提交于 2019-12-04 11:22:17
There are certain predefined exceptions in Java, which, if thrown, report that something serious has happened and you'd better improve your code, than catching them in a catch block (if I have understood it correctly). But still I find many programs in which I have the following: } catch (IOException e) { ... } catch (FileNotFoundException e) { .... } and I thought that IOException and FileNotFoundException are exactly such kind of exceptions, which we shouldn't catch in a catch block. Why people do this? Is it better to catch them like this? Java compiler warns anyway about any problem of

What is passed the the function in a Promise .catch block?

由 空扰寡人 提交于 2019-12-04 05:49:57
问题 What's the general difference between these two styles of handling .catch blocks in Promises: ... .catch(e => myMethod(e)) ... .catch(myMethod) What does a Promise's .catch pass to the receiving method? e.g. Can there be additional arguments? 回答1: In both cases, there is only one argument. There's no fundamental difference between these two styles, except that an arrow function behaves differently than a real function , especially this will be undefined or window (depending on whether strict

Can we get LineNumber and ColumnNumber in try block at which exception occured

由 左心房为你撑大大i 提交于 2019-12-04 02:54:38
I have the below code with which i am able to print the fullclassname,classname,methodname, at which error occured. Also, I am able to print Line-Number but the Line-Number printed is the line at which the variable "LineNumber" is initialized. How can i print the exact LineNumber and ColumnNumber in try block at which error occured? try { SQL Query } catch(Exception e) { String fullClassName = Thread.currentThread().getStackTrace()[1].getClassName(); String className = fullClassName.substring(fullClassName.lastIndexOf(".") + 1); String methodName = Thread.currentThread().getStackTrace()[1]

Why throw at derived class catches by base?

由 不想你离开。 提交于 2019-12-02 12:51:26
问题 For the code below, result is "EA Exception Finished", which means although we threw at derived class it caught by base class. Is it always? And if so, how can I make the derived class catches, thus "EB Exception Finished" appears? Also I can't exactly get what does it mean by throw EB() and catch(EA&) . And does catch(EA&) means the catch block gets a reference for EA object ? Sorry for my ignorance. If you recommend me a book or something to refer about exception structure, that'd be great

Why throw at derived class catches by base?

由 爷，独闯天下 提交于 2019-12-02 04:01:41
For the code below, result is "EA Exception Finished", which means although we threw at derived class it caught by base class. Is it always? And if so, how can I make the derived class catches, thus "EB Exception Finished" appears? Also I can't exactly get what does it mean by throw EB() and catch(EA&) . And does catch(EA&) means the catch block gets a reference for EA object ? Sorry for my ignorance. If you recommend me a book or something to refer about exception structure, that'd be great help. class EA {}; class EB: public EA {}; void F() { throw EB(); // throw at EB(). } int main() { try
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