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Your project contains error(s), please fix it before running it
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That usually comes from errors in the build path.
If you're using eclipse, there is a view you can add that lists all the errors called "Problems":
Otherwise, you can try to clean the project, and that usually solves a few proble...
How to diff a commit with its parent?
...rmed by a commit and its
parent commits exist. The r1^@ notation means all parents of r1. r1^!
includes commit r1 but excludes all of its parents.
This means that you can use 15dc8^! as a shorthand for 15dc8^..15dc8 anywhere in git where revisions are needed. For diff command the git di...
What issues should be considered when overriding equals and hashCode in Java?
What issues / pitfalls must be considered when overriding equals and hashCode ?
11 Answers
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:: (double colon) operator in Java 8
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Usually, one would call the reduce method using Math.max(int, int) as follows:
reduce(new IntBinaryOperator() {
int applyAsInt(int left, int right) {
return Math.max(left, right);
}
});
That requires a lot of ...
apache redirect from non www to www
...erName www.example.com for your real server configuration. Apache automatically preserves anything after the / when using the Redirect directive, which is a common misconception about why this method won't work (when in fact it does).
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Proper stack and heap usage in C++?
...n programming for a while but It's been mostly Java and C#. I've never actually had to manage memory on my own. I recently began programming in C++ and I'm a little confused as to when I should store things on the stack and when to store them on the heap.
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Stash only one file out of multiple files that have changed with Git?
...ot stash this hunk or any of the remaining ones
a - stash this hunk and all later hunks in the file
d - do not stash this hunk or any of the later hunks in the file
g - select a hunk to go to
/ - search for a hunk matching the given regex
j - leave this hunk undecided, see next undeci...
Shell one liner to prepend to a file
...t it sorta worked but weird things could happen, or it just didn't work at all, so it was furiously downvoted for a time. Such fun.
The solution exploits the exact implementation of file descriptors on your system and, because implementation varies significantly between nixes, it's success is enti...
Rails and PostgreSQL: Role postgres does not exist
I have installed PostgreSQL on my Mac OS Lion, and am working on a rails app. I use RVM to keep everything separate from my other Rails apps.
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Is it feasible to compile Python to machine code?
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There are several options:
Use Psyco, which emits machine code dynamically. You should choose carefully which methods/functions to convert, though.
Use Cython, which is a Python-like language that is compiled into a Python C extension
Use PyPy, which has a translator from RPython (a restricted ...