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How to access java-classes in the default-package?
..., some post-processing is needed to move the file into a dedicated package and add this "package" directive at its beginning.
Update 2014: bug 6975015, for JDK7 and JDK8, describe an even stricter prohibition against import from unnamed package.
The TypeName must be the canonical name of a class t...
Tuning nginx worker_process to obtain 100k hits per min
...vailable
}
worker_rlimit_nofile 20000; # Each connection needs a filehandle (or 2 if you are proxying)
# Total amount of users you can serve = worker_processes * worker_connections
more info: Optimizing nginx for high traffic loads
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Regular Expression to find a string included between two characters while EXCLUDING the delimiters
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Easy done:
(?<=\[)(.*?)(?=\])
Technically that's using lookaheads and lookbehinds. See Lookahead and Lookbehind Zero-Width Assertions. The pattern consists of:
is preceded by a [ that is not captured (lookbehind);
a non-greedy captured group. It's non-greedy to stop at the first ]; and
is...
javac error: Class names are only accepted if annotation processing is explicitly requested
... to include the .java suffix when compiling the program. Remember, the command is javac HelloWorldApp.java not javac HelloWorldApp.
Also, in your second javac-example, (in which you actually included .java) you need to include the all required .jar-files needed for compilation.
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psql - save results of command to a file
I'm using psql's \dt to list all tables in a database and I need to save the results.
10 Answers
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Rails migration: t.references with alternative name?
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This works on Rails 5.1 and none of the other suggestions do. It's much cleaner, and feels right.
– stephenmurdoch
May 6 '17 at 2:03
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Debugging JavaScript in IE7
... I don't see any script debugging options in the IE Dev Toolbar, and the lastest version of Web Development Helper isn't working, even after changing my advanced preferences and restarting IE7.
– stevebot
Aug 30 '11 at 16:14
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Using CSS how to change only the 2nd column of a table
...care what the selector is. nth-child is applied after finding the element, and it's nth compared to whatever parent it has, no matter if it was in the selector or not. You can see this working here: jsfiddle.net/JQQPz
– Nick Craver♦
Mar 29 '10 at 0:19
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Python how to write to a binary file?
...newFileByteArray)
If you're using Python 3.x, you can use bytes instead (and probably ought to, as it signals your intention better). But in Python 2.x, that won't work, because bytes is just an alias for str. As usual, showing with the interactive interpreter is easier than explaining with text, ...
Updating MySQL primary key
...delete u from user_interactions u, fixit
where fixit.user_2 = u.user_2
and fixit.user_1 = u.user_1
and fixit.type = u.type
and fixit.timestamp != u.timestamp;
alter table user_interactions add primary key (user_2, user_1, type );
unlock tables;
The lock should stop further updates comi...