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No appenders could be found for logger(log4j)?
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Just to get you going you have two simple approaches you can take.
First one is to just add this line to your main method:
BasicConfigurator.configure();
Second approach is to add this standard log4j.properties (taken from the above mentioned guide) file to your classpath:
# Set root logger le...
GUI not working after rewriting to MVC
...epts.
Addendum: I've modified the original example to show how MVC allows one to enhance the View without changing the nature of the Model.
Addendum: As @akf observes, MVC hinges on the observer pattern. Your Model needs a way to notify the View of changes. Several approaches are widely used:
In...
Python add item to the tuple
...t.ID-s which I try to store in the user session as tuple. When I add first one it works but tuple looks like (u'2',) but when I try to add new one using mytuple = mytuple + new.id got error can only concatenate tuple (not "unicode") to tuple .
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The tilde operator in Python
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One should note that in the case of array indexing, array[~i] amounts to reversed_array[i]. It can be seen as indexing starting from the end of the array:
[0, 1, 2, 3, 4, 5, 6, 7, 8]
^ ^
i ...
Convert base64 string to ArrayBuffer
... every byte sequence is valid unicode b) not every character in unicode is one byte so bytes[i] = binary_string.charCodeAt(i); can be wrong
– mixture
Aug 29 '18 at 10:41
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Broadcast receiver for checking internet connection in android app
...action android:name="android.net.wifi.WIFI_STATE_CHANGED" />
Just use one:
<action android:name="android.net.conn.CONNECTIVITY_CHANGE" />.
It will respond to only one action instead of two. See here for more information.
Answer to your second question (you want receiver to call only on...
Git repository broken after computer died
My computer went dead and now one of my git repositories is broken. When I try to checkout master it tells me:
15 Answers
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How to display request headers with command line curl
...o curl is -I.
Example usage:
$ curl -I http://heatmiser.counterhack.com/zone-5-15614E3A-CEA7-4A28-A85A-D688CC418287
HTTP/1.1 301 Moved Permanently
Date: Sat, 29 Dec 2012 15:22:05 GMT
Server: Apache
Location: http://heatmiser.counterhack.com/zone-5-15614E3A-CEA7-4A28-A85A-D688CC418287/
Content-Ty...
What is the explanation for these bizarre JavaScript behaviours mentioned in the 'Wat' talk for Code
... correct your JSFiddle code. However, I posted this on Hacker News and someone suggested that I repost it here.
The problem in the JSFiddle code is that ({}) (opening braces inside of parentheses) is not the same as {} (opening braces as the start of a line of code). So when you type out({} + []) y...
Modular multiplicative inverse function in Python
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Maybe someone will find this useful (from wikibooks):
def egcd(a, b):
if a == 0:
return (b, 0, 1)
else:
g, y, x = egcd(b % a, a)
return (g, x - (b // a) * y, y)
def modinv(a, m):
g, x, y = egcd(a, ...