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wkhtmltopdf: cannot connect to X server
...ctly, but through many requests by developers to have this run on servers without GUI, I am pretty sure it runs a virtual X server in the static version . I have been using the static (stand-alone) version of the program and it works great! I would put the executable file in a folder, and run:
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Iterating through a Collection, avoiding ConcurrentModificationException when removing objects in a
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Iterator.remove() is safe, you can use it like this:
List<String> list = new ArrayList<>();
// This is a clever way to create the iterator and call iterator.hasNext() like
// you would do in a while-loop. It wou...
JavaScript hashmap equivalent
...eys for a regular JavaScript dictionary. After all, you are in the best position to know what makes your objects unique. That's what I do.
Example:
var key = function(obj){
// Some unique object-dependent key
return obj.totallyUniqueEmployeeIdKey; // Just an example
};
var dict = {};
dict[key(...
Look up all descendants of a class in Ruby
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edited Apr 26 '12 at 10:57
answered Mar 6 '10 at 19:04
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Why doesn't String switch statement support a null case?
I am just wondering why the Java 7 switch statement does not support a null case and instead throws NullPointerException ? See the commented line below (example taken from the Java Tutorials article on switch ):
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Laravel Eloquent: How to get only certain columns from joined tables
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edited Jan 12 '15 at 9:52
Bas Peeters
2,97544 gold badges2929 silver badges4747 bronze badges
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CoffeeScript on Windows?
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edited May 23 '17 at 12:26
Community♦
111 silver badge
answered Oct 11 '10 at ...
Should I use string.isEmpty() or “”.equals(string)?
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The main benefit of "".equals(s) is you don't need the null check (equals will check its argument and return false if it's null), which you seem to not care about. If you're not worried about s being null (or are otherwise checking for it)...
Install tkinter for Python
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It is not very easy to install Tkinter locally to use with system-provided Python. You may build it from sources, but this is usually not the best idea with a binary package-based distro you're apparently running.
It's safer...
multiprocessing: sharing a large read-only object between processes?
...ependent memory space.
Solution 1
To make best use of a large structure with lots of workers, do this.
Write each worker as a "filter" – reads intermediate results from stdin, does work, writes intermediate results on stdout.
Connect all the workers as a pipeline:
process1 <source | proces...