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Should I declare Jackson's ObjectMapper as a static field?
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Yes, that is safe and recommended.
The only caveat from the page you referred is that you can't be modifying configuration of the mapper once it is shared; but you are not changing configuration so that is fine. If you did need to change configurat...
Difference between subprocess.Popen and os.system
...en("mycmd" + " myarg", shell=True).wait()
The "improved" code looks more complicated, but it's better because once you know subprocess.Popen(), you don't need anything else. subprocess.Popen() replaces several other tools (os.system() is just one of those) that were scattered throughout three othe...
Convert nested Python dict to object?
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How to remove old Docker containers
..., images (both dangling and unreferenced), and optionally, volumes, in one command.
For older Docker versions, you can string Docker commands together with other Unix commands to get what you need. Here is an example on how to clean up old containers that are weeks old:
$ docker ps --filter "sta...
How do I get the current absolute URL in Ruby on Rails?
...Rails 2:
You can write request.url instead of request.request_uri. This combines the protocol (usually http://) with the host, and request_uri to give you the full address.
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How to parse Excel (XLS) file in Javascript/HTML5
...an add promise to the function.
<script src="https://cdnjs.cloudflare.com/ajax/libs/xlsx/0.8.0/jszip.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/xlsx/0.8.0/xlsx.js"></script>
<script>
var ExcelToJSON = function() {
this.parseExcel = function(f...
What's “tools:context” in Android layout files?
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i see . according to the screenshot here : tools.android.com/_/rsrc/1337185954574/recent/newconfigchooser/… , it means that doesn't have to be a class that extends Context , right? if so, i think it does more that what you are saying , though i'm not sure what .
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Best way to find if an item is in a JavaScript array? [duplicate]
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but, since when is indexOf compatible with IE, because I found it is compatible with IE w3schools.com/jsref/jsref_indexof.asp
– ruselli
Aug 24 '17 at 13:18
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Why doesn't println! work in Rust unit tests?
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google oauth2 redirect_uri with several parameters
...ri is constant as set
in the app settings of Oauth.
eg :http://www.example.com/redirect.html
To pass several parameters to your redirect uri, have them stored in state
parameter before calling Oauth url, the url after authorization will send the same parameters to your redirect uri as
state=THE_STAT...