exception

问题 I'm mapping over an HBase table, generating one RDD element per HBase row. However, sometimes the row has bad data (throwing a NullPointerException in the parsing code), in which case I just want to skip it. I have my initial mapper return an Option to indicate that it returns 0 or 1 elements, then filter for Some , then get the contained value: // myRDD is RDD[(ImmutableBytesWritable, Result)] val output = myRDD. map( tuple => getData(tuple._2) ). filter( {case Some(y) => true; case None =>

问题 While debugging with eclipse IDE an HttpClientErrorException I noticed that property "cause" contains a reference to the error itself, so I went through and there it was the property "cause" again, and again ... forever. Why this property contains a reference to itself? 回答1: Throwable declares private Throwable cause = this; If the cause is not initialized, either by passing a cause in the constructor or by calling initCause , it will continue to point to this . Note that consequently

问题 I'm trying to get exceptions working with llvm for a very simple example, that I can later build on but i'm running into some real difficulties and i'm not sure why. I got clang to give me the following llir code, that I am passing into the MCJIT ; llvm-as c++exn.ll && llvm-ld -native c++exn.bc -lstdc++.6 && ./a.out %"class.std::ios_base::Init" = type { i8 } %"class.std::basic_ostream" = type { i32 (...)**, %"class.std::basic_ios" } %"class.std::basic_ios" = type { %"class.std::ios_base", %

问题 I'm trying to get exceptions working with llvm for a very simple example, that I can later build on but i'm running into some real difficulties and i'm not sure why. I got clang to give me the following llir code, that I am passing into the MCJIT ; llvm-as c++exn.ll && llvm-ld -native c++exn.bc -lstdc++.6 && ./a.out %"class.std::ios_base::Init" = type { i8 } %"class.std::basic_ostream" = type { i32 (...)**, %"class.std::basic_ios" } %"class.std::basic_ios" = type { %"class.std::ios_base", %

问题 I am writing a unit test for a WCF web service. I am deliberately sending an invalid request to the server which throws a WebExceptionFault<string> . In the unit test, the Exception that gets caught is an EndpointNotFoundException with the standard WebException in the InnerException property. I want to verify the body of the response matches the string that I think should be there. I am coming accross a problem, however, as the Response property of the WebException (which is a System.Net

问题 I'm very confused about how Exception handling works with coroutines. I was hoping that it would be possible to have a chain of suspend functions that would pass Exceptions between themselves like synchronous code. So if say Retrofit threw an IOException, I could handle that exception at the beginning of the chain of suspend functions such as in a presenter to show an error to a user. I made this simple example to try out coroutines but if I uncomment either throw Exception call the code

问题 I'm aware of the fact that $@ is a global variable, still I can't figure out why I need to localize it before using eval: For instance: eval { SOME_FUNC_THAT_MAY_DIE(); }; if ($@) { print "An error occured!\n"; } The only possible thing I can think of is, if some signal handler will call die at the same time I try to read $@ , what am I missing here? 回答1: The reason to say local $@ before calling eval is to avoid stepping on your caller's $@ . It's rude for a subroutine to alter any global

问题 Is there a way I can tell PHP to throw an exception when I am trying to access a member or method on a null object? E.g.: $x = null; $x->foo = 5; // Null field access $x->bar(); // Null method call Right now, I only get the following errors which are not nice to handle: PHP Notice: Trying to get property of non-object in ... PHP Warning: Creating default object from empty value in ... PHP Fatal error: Call to undefined method stdClass::bar() in ... I would like to have a specific exception

问题 When try to load my application on device sometimes i got following exception dyld`gdb_image_notifier:0x2beca0cc: bx lr but after stop and run again everything works fine, can anyone tell me why this occurs 回答1: Basically it seems there is a breakpoint in the debugger. Thought it's not a solution, in order to run the app on the device, just click "Debug" and then "Continue" (or ^⌘Y). That should help pass the breakpoint and carry on running the app. "Debug" -> "Deactivate Breakpoints" can

问题 I am working on a C# project and want to make use of the UnhandledException event to catch any exceptions I may have missed in my project (hoping there won't be any but to be on the same side). I make quite a bit of software so I want to make a class library that all of my projects will make use of so I want to have one function that does all of the initialisation stuff of all my projects without me having to copy and paste the code into each project to do the same work. What I am wondering