Throwing Exception is a bad practice and should be avoided. Alas, there is no single rule to let you determine when to catch, when to rethrow, when to use checked and when to use unchecked exceptions. I agree this causes much confusion and a lot of bad code. The general principle is stated by Bloch (you quoted a part of it).
Checked Exceptions are great, so long as you understand when they should be used. The Java core API fails to follow these rules for SQLException (and sometimes for IOException) which is why they are so terrible. Checked Exceptions should be used for predictable, but unpreventable errors that are reasonable to recover from. Unchecked Exceptions should be used for everything else. I'll break ...
What are Null Pointer Exceptions (java.lang.NullPointerException) and what causes them? What methods/tools can be used to determine the cause so that you stop the exception from causing the progra...
Exception : System.Management.Automation.RuntimeException: Attempted to divide by zero. ---> System.DivideByZeroException: Attempted to divide by zero. --- End of inner exception stack trace --- at System.Management.Automation.ExceptionHandlingOps.CheckActionPreference(FunctionContext funcContext, Exception exception)
I am using ASP.NET Core for my new REST API project after using regular ASP.NET Web API for many years. I don't see any good way to handle exceptions in ASP.NET Core Web API. I tried to implement an
There is 1) creating a custom exception type/class (as shown so many times) and 2) raising the exception. To raise an exception, simply pass the appropriate instance to throw, normally: throw new MyFormatExpcetion("spaces are not allowed"); -- you could even use the standard ParseException, without "creating" a custom exception type.
A first chance exception of type 'System.Runtime.InteropServices.COMException' occurred in Microsoft.Surface.Core.dll ... The last Exception is thrown all the time until I stop the program.
To do this, define a new class that inherits Exception, add all four exception constructors, and optionally an additional constructor that takes an InnerException as well as additional information, and throw your new exception class, passing ex as the InnerException parameter.
I have some code and when it executes, it throws a NullReferenceException, saying: Object reference not set to an instance of an object. What does this mean, and what can I do to fix this error?
@aaronsteers it does use the captured exception; in an exception handler the current exception is available via the sys.exc_info() function and the traceback.print_exc() function gets it from there. You’d only ever need to pass in an exception explicitly when not handling an exception or when you want to show info based on a different exception.
