If you call System.exit() the program exits immediately without finally being called. A JVM Crash e.g. Segmentation Fault, will also prevent finally being called. i.e. the JVM stops immediately at this point and produces a crash report. An infinite loop would also prevent a finally being called. The finally block is always called when a … Read more
TL;DR NO, exceptions are usually faster on the non-exceptional path compared to error code handling. Well, the obvious remark is compared to what ? Compared to not handling the error, it obviously decrease performance; but is performance worth the lack of correctness ? I would argue it is not, so let us supposed that you … Read more
I usually do it like this: try { // Use the resource. } catch( Exception ex ) { // Problem with the resource. } finally { // Put away the resource. closeQuietly( resource ); } Elsewhere: protected void closeQuietly( Resource resource ) { try { if (resource != null) { resource.close(); } } catch( Exception … Read more
PERFORMANCE: There is absolutely no performance difference in where the try/catch structures are placed. Internally, they are implemented as a code-range table in a structure that is created when the method is called. While the method is executing, the try/catch structures are completely out of the picture unless a throw occurs, then the location of … Read more
The ExceptionUtils#getRootCause() method can come in very handy in such situations.
I had the same problem and as it turned out, my system had no swap space enabled. Check if this is the case by running the command free -m: vagrant@vagrant-ubuntu-trusty-64:~$ free -m total used free shared buffers cached Mem: 2002 233 1769 0 24 91 -/+ buffers/cache: 116 1885 Swap: 0 0 0 Looking at … Read more
You’ll have to make this separate try blocks: try: code a except ExplicitException: pass try: code b except ExplicitException: try: code c except ExplicitException: try: code d except ExplicitException: pass This assumes you want to run code c only if code b failed. If you need to run code c regardless, you need to put … Read more
“Programs must be written for people to read, and only incidentally for machines to execute.” Abelson & Sussman, SICP, preface to the first edition Always aim for readable code. The key thing to remember is: Avoid try-catch in performance-critical functions, and loops Anywhere else they won’t do much harm. Use them wisely, use them when … Read more
Yes, this is a limitation in the exception handling logic. If a method contains more than one throw statement that throws an exception then you’ll get the line number of the last one that threw. This example code reproduces this behavior: using System; class Program { static void Main(string[] args) { try { Test(); } … Read more
catch an exception only if you can handle it in a meaningful way declare throwing the exception upward if it is to be handled by the consumer of the current method throw exceptions if they are caused by the input parameters (but these are more often unchecked)