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“PKIX path building failed” and “unable to find valid certification path to requested target”
...rst run I got an error about certificate sun.security.validator.ValidatorException and sun.security.provider.certpath.SunCertPathBuilderException . Then I added twitter certificate by:
...
How to copy an object in Objective-C
.... You call copyWithZone on all your fields, to make a deep copy. A simple example is
@interface YourClass : NSObject <NSCopying>
{
SomeOtherObject *obj;
}
// In the implementation
-(id)copyWithZone:(NSZone *)zone
{
// We'll ignore the zone for now
YourClass *another = [[YourClass all...
Shall we always use [unowned self] inside closure in Swift
... to make sure that it is still around by the time the closure is called.
Example: Making an asynchronous network request
If you are making an asynchronous network request you do want the closure to retain self for when the request finishes. That object may have otherwise been deallocated but you s...
C/C++ macro string concatenation
... the statement above and observe that the program fragment
#define PPCAT_NX(A, B) A ## B
PPCAT_NX("s", "1")
produces this error message from the preprocessing phase of gcc: error: pasting ""s"" and ""1"" does not give a valid preprocessing token
]
However, for general token pasting, try this:
...
Does Java SE 8 have Pairs or Tuples?
...d with lazy functional operations in Java SE 8, and I want to map an index i to a pair / tuple (i, value[i]) , then filter based on the second value[i] element, and finally output just the indices.
...
How to exclude a directory in find . command
I'm trying to run a find command for all JavaScript files, but how do I exclude a specific directory?
38 Answers
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How can prepared statements protect from SQL injection attacks?
...separately.
That's all.
The root of the SQL injection problem is in the mixing of the code and the data.
In fact, our SQL query is a legitimate program.
And we are creating such a program dynamically, adding some data on the fly. Thus, the data may interfere with the program code and even alte...
Unit Testing C Code [closed]
...orked on an embedded system this summer written in straight C. It was an existing project that the company I work for had taken over. I have become quite accustomed to writing unit tests in Java using JUnit but was at a loss as to the best way to write unit tests for existing code (which needed re...
Avoid synchronized(this) in Java?
...ally. What it amounts to is that this use of this is part of your class' exposed interface, and should be documented. Sometimes the ability of other code to use your lock is desired. This is true of things like Collections.synchronizedMap (see the javadoc).
All synchronized methods within the ...
Parallel.ForEach vs Task.Factory.StartNew
... out Microsoft's Patterns of Parallel Programming article; it's got great explanations of all of this stuff in it.
– Mal Ross
Feb 17 '11 at 14:37
2
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