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Why is Class.newInstance() “evil”?
... this very simple class (does not matter that it is broken):
static class Foo {
public Foo() throws IOException {
throw new IOException();
}
}
And you try to create an instance of it via reflection. First Class::newInstance:
Class<Foo> clazz = ...
try {
cla...
Why does flowing off the end of a non-void function without returning a value not produce a compiler
... as a curiosity, look what this code does:
#include <iostream>
int foo() {
int a = 5;
int b = a + 1;
}
int main() { std::cout << foo() << std::endl; } // may print 6
This code has formally undefined behaviour, and in practice it's calling convention and architecture depe...
How to flush output of print function?
...ust provide flush=True as a keyword argument to the print function:
print('foo', flush=True)
Python 2 (or < 3.3)
They did not backport the flush argument to Python 2.7 So if you're using Python 2 (or less than 3.3), and want code that's compatible with both 2 and 3, may I suggest the following ...
Spring Data JPA - “No Property Found for Type” Exception
...re was an interface defined for the old property name.
public interface IFooDAO extends JpaRepository< Foo, Long >{
Foo findByOldPropName( final String name );
}
The error indicated that it could no longer find "OldPropName" and threw the exception.
To quote the article on DZone:
...
How can I add an item to a IEnumerable collection?
...lOrEmpty(s));
}
IEnumerable<string> lines = ReadLines();
lines.Add("foo") // so what is this supposed to do??
What you can do, however, is create a new IEnumerable object (of unspecified type), which, when enumerated, will provide all items of the old one, plus some of your own. You use Enu...
What would be C++ limitations compared C language? [closed]
...itrary subset of C++. C is not a subset of C++ at all.
This is valid C:
foo_t* foo = malloc ( sizeof(foo_t) );
To make it compile as C++ you have to write:
foo_t* foo = static_cast<foo_t*>( malloc ( sizeof(foo_t) ) );
which isn't valid C any more. (you could use the C-style cast, it wh...
Difference between clustered and nonclustered index [duplicate]
... index). For example, if you have the query (in pseudocode)
SELECT * FROM FOO WHERE FOO.BAR = 2
You might want to put an index on FOO.BAR. A clustered index should be used on a column that will be used for sorting. A clustered index is used to sort the rows on disk, so you can only have one per t...
Should I pass a shared_ptr by reference? [duplicate]
...ht experiment. Let us define a shared pointer type SF = std::shared_ptr<Foo>. In order to consider references, rather than passing function arguments let us look at the type RSF = std::reference_wrapper<T>. That is, if we have a shared pointer SF p(std::make_shared<Foo>());, then w...
How do I vertically align something inside a span tag?
...
The flexbox way:
.foo {
display: flex;
align-items: center;
justify-content: center;
height: 50px;
}
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How to check certificate name and alias in keystore files?
... also specify it in the command:
keytool -list -keystore .keystore -alias foo
If the alias is not found, it will display an exception:
keytool error: java.lang.Exception: Alias does not exist
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