Null pointer exception msdn

NET — General. Are you using Silverlight? And if so, is this post helpful? Archived Forums V. Visual Basic Language. Answered 3 Replies Views Created by ganesh. Exception Archived Forums M. You need to do all the UCC operations on the same thread that created the platform. You could create a work queue that other threads could add items Archived Forums. Answered 5 Replies Views Created by ganesh.

An unhandled exception of type 'System. COMException' occurred in mscorlib. Exception thrown at 0xB KernelBase. Catching an error when it's already blown up in your face, then deciding to just move on like it didn't happen, is not a good coding strategy. Things like null pointer dereference, stack overflow, etc. There is no platform independent way to do this. But I wouldn't recommend doing it anyway. You almost certainly cannot recover correctly from a segmentation fault.

Short answer- you can't in a portable or standard way, because bugs like this are potentially corrupting the process itself. Long answer- you can do more than you might think, and definitely more than the default of the program just crashing. However, you need to keep 3 things in mind: 1 These bugs are MORE severe than exceptions and often cannot present as exceptions to your logic.

Basically, faults like segfaults or heap corruption are not exceptions because they're corrupting the actual process running the program. Anything you coded into the program is part of the program, including exception handling, so anything beyond logging a nice error message before the process dies is inadvisable in the few cases it isn't impossible. In POSIX, the OS uses a signaling system to report faults like these, and you can register callback functions to log what the error was before you exit.

In Windows, the OS can sometimes convert them into normal-looking exceptions which you can catch and recover from. Ultimately, however, your best bet is to code defensively against such nightmares. On any given OS there will be some that are so bad that you cannot detect them, even in principle, before your process dies.

For example, corrupting your own stack pointer is something that can crash you so badly that even your POSIX signal callbacks never see it. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams?

Collectives on Stack Overflow. Learn more. How to catch the null pointer exception? Asked 12 years, 1 month ago. Active 5 years, 7 months ago. Viewed 85k times. Avoid crashing my program, or get struck down by lightning. An age-old programmer's dilemma.

Add a comment. Microsoft supports SEH as a programming technique at the compiler level only. But what about the clang-cl drop in replacement? Clang 4. GCC has a Wiki page which states:. Casper Hornstrup had created an initial implementation, but it was never merged into mainline GCC.

Some people have expressed concerns over a Borland patent on SEH, but Borland seems to dismiss these concerns as balderdash. POSIX had an update to std::signal which works in multi-threaded environment and it provides information about error cases, this update is sigaction.

I have put the code on github and I have tested on two machines: Lenovo W i7 laptop and a Raspberry Pi 2. As to what trace methods could be used to trouble shoot this, there are couple of them. One you could look at the sql server traces using sql ser profiler and see what is happening on the server side who is sending the duplicate errors. Thank you for examining my problem. We have tried the v1.

Also, we can reproduce this only so far on our most powerful machines. When we go to slower less concurrent machines we have not been able to reproduce the problem. Since any changes that make the code run slower seem to make the problem go away, we did try at least adding code so that when these processes fail, they print ALL IDs that were being inserted.

Note however, that the keys from the two failing processes were interleaved but NEVER overlapped, meaning that obviously these two transactions were happening concurrently. I cannot prove this, since I can't get the thing to fail with appropriate SQL tracing, but I see no other explaination.

Obviously its a very small window since it doesn't reproduce on lower class machines, but our customers production boxes are equal to the boxes that are seeing failure. I am trying to get the jdbc logging that you have requested- is there anything else that I can do that would provide insight into the problem. Do you have a "debug" version of the driver with source lines so that we could get a line number from the stack trace. Our company has MSDN subscriptions- anything on there?

Would anything be gained by using your commercial support resources for this problem?