exception-handling

I am trying to create a filter to handle exceptions (see Handling Uncaught Exception in JSF ) public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { try { log.info("check filter is running"); chain.doFilter(request, response); } catch (Exception e) { log.error("Uncaught exception",e); request.setAttribute("exception", e); request.getRequestDispatcher("/error.xhtml").forward(request, response); } } I execute the following method: <p:commandButton value="Dispatch Order" update="@form" action="#{orderBean.dispatchOrder()}">

try { // call to Com Method } catch (COMException e) { if (e.ErrorCode == 0x80040154) // REGDB_E_CLASSNOTREG. { // handle this error. } } I would like to check if com exception is thrown due to REGDB_E_CLASSNOTREG then handle it. I tried with the code above but it gives warning: Comparison to integral constant is useless; the constant is outside the range of type 'int' I believe this error is due to 0x80040154 is not in Int32 range. Can you suggest any possible solution? or Is there any other way to check this? Use the unchecked keyword: catch (COMException ex) { if (ex.ErrorCode == unchecked(

We are building an ASP.NET application in C# We have 3 layers: UI, Business and Database. We need clarification on error handling/logging. We have a error logging framework to log errors. My question is: do we need to log errors in each layer or only in the main calling layer (UI layer) by throwing the errors to UI layer from business and database layers? Is there a best practice? If would be great if you could also provide a reference document or web references (If needed). Thanks and Regards … Sruthi Keerthi. Handle any exceptions that you can in the layer that they occur. Let the ones that

When we try to run the following program then we get the error that Exception in thread "main" java.lang.ArithmeticException: / by zero class excp { public static void main(String args[]) { int x = 0; int a = 30/x; } } but when we ask somebody how these works, then he tell me that this exception is cautch by the default exception handler, So i could't understand how this defualt exception handler works. Plz elaborate this. Quoting JLS 11 : 30/x - violates the semantic constraint of Java Language - hence the exception will occur. If no catch clause that can handle an exception can be found,

The thread Nesting await in Parallel.ForEach has an answer suggested to use Task.WhenAll to run multiple (MaxDegreeOfParallelism) asynchronous tasks in parallel, not waiting until previous task is completed. public static Task ForEachAsync<T>( this IEnumerable<T> source, int dop, Func<T, Task> body) { return Task.WhenAll( from partition in Partitioner.Create(source).GetPartitions(dop) select Task.Run(async delegate { using (partition) while (partition.MoveNext()) await body(partition.Current).ContinueWith(t => { //observe exceptions }); })); } And call it like ids.ForEachAsync(10, async id =>

I have resource class which itself's talks with a internal service. This resource acts a rest API for the service. The service layer can throw unexpected exceptions, thus the resource should handle those handled unexpected exceptions and log it. I am using dropwizard framework which in turns use jersey. It goes like this. @PATH(/user) @GET public Response getUser(@QueryParam("id") String userId) { assertNotNull(userId); try { User user = service.getUser(userId); return Response.ok(user).build(); } catch (MyOwnException moe) { //basically 400's return Response.status(400).entity(moe.getMsg())