exception

问题 I have not been able to find a satisfying answer to this question anywhere. Could someone with an understanding of the internals please explain this? I wrote a simple client/server to demonstrate this issue. The server reads one line of text then closes the socket. The client writes one line of text, waits 10 seconds, then writes two more lines of text. The second write (after 10 seconds) fails but the first write always succeeds. Why can't the BufferedWriter throw an exception on the first

问题 This question already has answers here : Closed 9 years ago . Possible Duplicate: Compile-time and runtime casting c# As I understand it, the following code will always compile, and will additionally always fail at run-time by throwing an InvalidCastException . Example: public class Post { } public class Question : Post { } public class Answer : Post { public void Fail() { Post p = new Post(); Question q = (Question)p; // This will throw an InvalidCastException } } My questions are... If my

问题 In More Effective C++ , Scott Meyers says C++ specifies that an object thrown as an exception is copied. I suppose then, that if the copy constructor throws an exception in turn, std::terminate is called, so this is a good reason for declaring all my exceptions' copy constructors noexcept (and also, I guess, to not throw objects which allocate memory from the heap, like std::string ). Yet I was surprised to see that the standard library implementation shipped with GCC 4.7.1 doesn’t define

问题 I have a procedure that takes an input of 2 Associative arrays and after some basic count checks, does a FORALL statement to insert the data into a table. Here is the procedure: PROCEDURE INSERT_RECS(P_PROD_TYP IN prod_type, P_PROD_ADD_PK IN prod_pk_type) IS uniq_key EXCEPTION; PRAGMA EXCEPTION_INIT(uniq_key, -00001); loc_cnt NUMBER; BEGIN IF P_PROD_TYP.COUNT = P_PROD_ADD_PK.COUNT THEN FORALL i IN P_PROD_TYP.FIRST .. P_PROD_TYP.LAST INSERT INTO product_table ( pk, id, created_by, created_on,

问题 I have a procedure that takes an input of 2 Associative arrays and after some basic count checks, does a FORALL statement to insert the data into a table. Here is the procedure: PROCEDURE INSERT_RECS(P_PROD_TYP IN prod_type, P_PROD_ADD_PK IN prod_pk_type) IS uniq_key EXCEPTION; PRAGMA EXCEPTION_INIT(uniq_key, -00001); loc_cnt NUMBER; BEGIN IF P_PROD_TYP.COUNT = P_PROD_ADD_PK.COUNT THEN FORALL i IN P_PROD_TYP.FIRST .. P_PROD_TYP.LAST INSERT INTO product_table ( pk, id, created_by, created_on,

问题 I'm doing a restfull api in cakephp... And sometime i have some throw exceptions. For example: if (!$this->request->is('post')) { throw new MethodNotAllowedException("The requested resource does not support http method " . $this->request->param('_method')); } My problem is when the url is /controller/action.json the response is : { message: "The requested resource does not support http method GET", url: "/api/auth/users/authenticate.json", code: 405 } In json format, but, when my url is

问题 I am making a WinForms application which includes a form that uses a DataGridView to handle simple data manipulation. To ensure accurate entry while mitigating clutter (read: without using DataGridViewComboBoxColumn ) I have a couple event handlers which temporarily turn a DataGridViewTextBoxCell into an equivalent DataGridViewComboBoxCell connected to values known to be "clean" when editing events are raised (typically when an editable cell is clicked): private void OnCellEndEdit(object

问题 I have Spring MVC setup to log exceptions using commons logging, but find that some runtime exceptions aren't being logged. Here's my bean configuration for the default exception resolver provided by spring: <bean class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver"> <property name="exceptionMappings"> <props> <prop key="java.lang.Exception">error</prop> </props> </property> </bean> 回答1: To get this to log most exceptions, I had to add the following line to my config

问题 I have Spring MVC setup to log exceptions using commons logging, but find that some runtime exceptions aren't being logged. Here's my bean configuration for the default exception resolver provided by spring: <bean class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver"> <property name="exceptionMappings"> <props> <prop key="java.lang.Exception">error</prop> </props> </property> </bean> 回答1: To get this to log most exceptions, I had to add the following line to my config

问题 In case one task of gather raises an exception, the others are still allowed to continue. Well, that's not exactly what I need. I want to distinguish between errors that are fatal and need to cancel all remaining tasks, and errors that are not and instead should be logged while allowing other tasks to continue. Here is my failed attempt to implement this: from asyncio import gather, get_event_loop, sleep class ErrorThatShouldCancelOtherTasks(Exception): pass async def my_sleep(secs): await