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Postgres: “ERROR: cached plan must not change result type”
...after the database table was modified. This reset the database connection, allowing the prepared statement to execute without errors.
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Why is the Java main method static?
...c because otherwise there would be ambiguity: which constructor should be called? Especially if your class looks like this:
public class JavaClass{
protected JavaClass(int x){}
public void main(String[] args){
}
}
Should the JVM call new JavaClass(int)? What should it pass for x?
If not,...
PHP memory profiling
...r example, to see how much memory my data is using, and/or which function calls are allocating the most memory.
4 Answers
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How do the PHP equality (== double equals) and identity (=== triple equals) comparison operators dif
... such as !== or ===, then you can always be sure that the types won't magically change, because there will be no converting going on. So with strict comparison the type and value have to be the same, not only the value.
Type comparison table
As reference and example you can see the comparison tabl...
Grasping the Node JS alternative to multithreading
...l so it can perform blocking operations and notify the main thread with a callback or event when things complete.
So I imagine that it will make limited use of another core for the thread pool, for example if you do a non-blocking file system read this is likely implemented by telling a thread fro...
Spring @PostConstruct vs. init-method attribute
...
No practically I don't think there is any difference but there are priorities in the way they work. @PostConstruct, init-method are BeanPostProcessors.
@PostConstruct is a JSR-250 annotation while init-method is Spring's way of havin...
What Are the Differences Between PSR-0 and PSR-4?
...in src/Acme/Foo/Bar.php while in PSR-4 it will look for it in src/Bar.php, allowing for shorter directory structures. On the other hand some prefer to have the full directory structure to clearly see what is in which namespace, so you can also say that Acme\Foo\ is in src/Acme/Foo with PSR-4 which w...
Best implementation for hashCode method for a collection
... is a hard question because it depends on the usage pattern.
A for nearly all cases reasonable good implementation was proposed in Josh Bloch's Effective Java in Item 8 (second edition). The best thing is to look it up there because the author explains there why the approach is good.
A short vers...
Java, Classpath, Classloading => Multiple Versions of the same jar/project
...nt) that some of the other frameworks/jars used in my project require. But all of them require different major versions like:
...
Git: Find the most recent common ancestor of two branches
...ed Acyclic Graph, and yet it's often thought of as a tree, which it technically is not. To be more careful in my wording, I was talking about the case where you want the parent of the first instance of the "branches" diverging... since they may have multiple points where they re-merged and re-split...