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NullPointerException in Java with no StackTrace
...sing log4j. I discovered (inadvertently) a place where I had written
LOG.error(exc);
instead of the typical
LOG.error("Some informative message", e);
through laziness or perhaps just not thinking about it. The unfortunate part of this is that it doesn't behave as you expect. The logger API ...
Is there a way to make GHC provide the type class constraints of typed holes?
...vious in GHCi. With your example,
> show _
<interactive>:7:6: error:
• Found hole: _h :: ()
Or perhaps ‘_h’ is mis-spelled, or not in scope
• In the first argument of ‘show’, namely ‘_h’
In the expression: show _h
In an equation for ‘it’: it...
解决：Failed to load JavaHL Library（windows及mac） - 更多技术 - 清泛...
...vaHL Library（windows及mac）Failed to load JavaHL Library.These are the errors that were encountered:no libsvnjavahl-1 in java.library.pathno sv...Failed to load JavaHL Library.
These are the errors that were encountered:
no libsvnjavahl-1 in java.library.path
no svnjavahl-1 in java.library.pa...
Linux C/C++进程单实例互斥代码分享 - C/C++ - 清泛网 - 专注C/C++及内核技术
..., O_RDWR | O_TRUNC);
}
}
if (fd < 0) {
printf("Open file failed, error : %s", strerror(errno));
exit(1);
}
// 将该文件锁定,锁定后的文件将不能够再次锁定
struct flock fl;
fl.l_type = F_WRLCK; // 写文件锁定
fl.l_start = 0;
fl.l_whence = SEEK_SET;
fl...
SSL_connect returned=1 errno=0 state=SSLv3 read server certificate B: certificate verify failed
...
ERROR: rvm update has been removed. See 'rvm get' and rvm 'rubygems' CLI API instead
– yang
Apr 13 '14 at 5:10
...
MySQL: Transactions vs Locking Tables
... $50 you should have ended up with ($100 - $20 - $30). In this case, "bank error in your favor".
Now, let's say you use locks. Your bill payment ($20) hits the pipe first, so it wins and locks your account record. Now you've got exclusive use, and can deduct the $20 from the balance, and write the ...
What's the fastest way to convert String to Number in JavaScript?
...
I think 1* is preferred because it is less error prone. A unwanted dangling variable before +1 is not a parsing error. It is a trick similar to using if (MYCONSTANT == myvar) in C.
– Tomas
Nov 6 '13 at 14:22
...
Removing the fragment identifier from AngularJS urls (# symbol)
...pushState){
//$locationProvider.html5Mode(true); will cause an error $location in HTML5 mode requires a tag to be present! Unless you set baseUrl tag after head tag like so: <head> <base href="/">
// to know more about setting base URL visit: https://docs.angularjs...
Format of the initialization string does not conform to specification starting at index 0
...to production db and use it. When I deploy same settings I am getting this error. Do you have idea what could go wrong? Thanks
– Denis Besic
Jun 24 '13 at 20:22
3
...
doGet and doPost in Servlets
...ord">
<input type="submit" value="login">
<span class="error">${error}</span>
</form>
...which can be used in combination with this piece of Servlet:
@WebServlet("/login")
public class LoginServlet extends HttpServlet {
@EJB
private UserService userServ...