The RunWorkerCompleted event is marshaled from the BGW thread to the UI thread by the WF plumbing that makes Control.Invoke() work. Essentially, there’s a queue with delegates that is emptied by the message loop. The code that does this, Control.InvokeMarshaledCallbacks(), you’ll see it on the call stack, has a catch (Exception) clause to catch unhandled … Read more
You can do it with a simple EvaluatorFilter: <filter class=”ch.qos.logback.core.filter.EvaluatorFilter”> <evaluator> <expression>java.lang.RuntimeException.class.isInstance(throwable)</expression> </evaluator> <onMatch>DENY</onMatch> </filter> Please note that you need the following dependency in your pom.xml as well: <dependency> <groupId>org.codehaus.janino</groupId> <artifactId>janino</artifactId> <version>3.1.9</version> </dependency> Another possible solution is a custom Filter implementation: import ch.qos.logback.classic.spi.ILoggingEvent; import ch.qos.logback.classic.spi.IThrowableProxy; import ch.qos.logback.classic.spi.ThrowableProxy; import ch.qos.logback.core.filter.Filter; import ch.qos.logback.core.spi.FilterReply; public class SampleFilter extends … Read more
Just use a route: // We couldn’t find a route to handle the request. Show the 404 page. routes.MapRoute(“Error”, “{*url}”, new { controller = “Error”, action = “404” } ); Since this will be a global handler, put it all the way at the bottom under the Default route.
Yes, there’s the defaultUncaughtExceptionHandler, but it only triggers if the Thread doesn’t have a uncaughtExceptionHandler set.
There is an option in the Eclipse Preferences that allows inspecting of the thrown exception: Check Java -> Debug -> Open popup when suspended on exception With this option there will be a popup allowing inspection of the exception. Strange that this option is not checked by default as it is very useful !
CopyOnWriteArrayList.subLists throw ConcurrentModificationExceptions if the containing list changes out from underneath it: public class ListTest { private static List<int[]> intList; public static void main (String[] args) { CopyOnWriteArrayList<Integer> cowal = new CopyOnWriteArrayList<Integer>(); cowal.add(1); cowal.add(2); cowal.add(3); List<Integer> sub = cowal.subList(1, 2); cowal.add(4); sub.get(0); //throws ConcurrentModificationException } }
When a client connects to an Oracle server, it first connnects to the Oracle listener service. It often redirects the client to another port. So the client has to open another connection on a different port, which is blocked by the firewall. So you might in fact have encountered a firewall problem due to Oracle … Read more
RETURN NEXT just returns what output parameters currently hold. The manual: If you declared the function with output parameters, write just RETURN NEXT with no expression. You object: There are no OUT parameters. Output parameters are declared among function parameters with the keyword OUT or INOUT, or implicitly in your RETURNS clause: RETURNS TABLE(column1 integer, … Read more
Exceptions are not free… so they are expensive 🙂 The book Effective Java covers this in good detail. Item 39 Use exceptions only for exceptional conditions. Item 40 Use exceptions for recoverable conditions The author found that exceptions resulted in the code tunning 70 times slower for his test case on his machine with his … Read more
Your idea about setting a variable outside the scope of the try/catch/finally is correct. There cannot be more than one exception propagating at once.