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What does java:comp/env/ do?
...at context descriptor went, by default, under java:comp/env, wouldn't that mean that I can omit the java:comp/env from the value? In my case, I had to add it to make the "Name jdbc is not bound in this Context" error go away.
– Danny
Nov 4 '10 at 21:49
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HashMap get/put complexity
...a bad hashCode() implementation could result to multiple collisions, which means that in the worst case every object goes to the same bucket, thus O(N) if each bucket is backed by a List.
since Java 8, HashMap dynamically replaces the Nodes (linked list) used in each bucket with TreeNodes (red-blac...
Setting up maven dependency for SQL Server
...ight coupling with the development machine you are building your app on? I mean if the same project is tried to be build on a different machine, it would not find the jar in the local repo. Wouldn't it be good to add it to the project so that its available on VCS?
– Obaid Maroo...
How does inheritance work for Attributes?
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When Inherited = true (which is the default) it means that the attribute you are creating can be inherited by sub-classes of the class decorated by the attribute.
So - if you create MyUberAttribute with [AttributeUsage (Inherited = true)]
[AttributeUsage (Inherited = Tru...
Break when exception is thrown
...pend on uncaught exceptions" is checked off. In the example above, does it mean break on any uncaught exceptions of the type "ActivationException", or does it mean break on any uncaught exception of any type? Very poorly described.
– AndroidDev
Jun 10 '13 at 14...
Center Google Maps (V3) on browser resize (responsive)
...e same code in other event handlers when resizing the google map via other means (e.g. with a jQuery-UI 'resizable' control).
Source: http://hsmoore.com/blog/keep-google-map-v3-centered-when-browser-is-resized/ credit to @smftre for the link.
Note: This code was linked in @smftre's comment on the ...
how to find host name from IP with out login to the host
...nf.
Also note that just because a DHCP lease exists for a client, doesn't mean it's still being used.
NetBIOS for TCP/IP (NBT) was used for decades to perform name resolution, but has since been replaced by LLMNR for name resolution (part of zeroconf on Windows). This legacy system can still be qu...
Git push results in “Authentication Failed”
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@IanW Do you mean git config --global --unset credential.helper? That's what worked for me in Git Bash.
– Ellen Spertus
May 15 '17 at 17:51
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Django: “projects” vs “apps”
...and "application" in this context, because I'm not clear on their specific meaning in Django.
6 Answers
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How do I expire a PHP session after 30 minutes?
...* 30)) {
unset($_SESSION['example']);
}
Edit: I've got a feeling you mean something else though.
You can scrap sessions after a certain lifespan by using the session.gc_maxlifetime ini setting:
Edit:
ini_set('session.gc_maxlifetime', 60*30);
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