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Is it safe to get values from a java.util.HashMap from multiple threads (no modification)?
...ting thread makes the reference to the map visible to other threads.
Basically, the only possible race here is between the construction of the HashMap and any reading threads that may access it before it is fully constructed. Most of the discussion is about what happens to the state of the map obje...
Iterating through a range of dates in Python
...erated over. Also the "if" in the generator seems to be unnecessary.
After all, a linear sequence should only require one iterator, not two.
Update after discussion with John Machin:
Maybe the most elegant solution is using a generator function to completely hide/abstract the iteration over the rang...
How to see log files in MySQL?
I've read that Mysql server creates a log file where it keeps a record of all activities - like when and what queries execute.
...
Hibernate Error: org.hibernate.NonUniqueObjectException: a different object with the same identifier
... had this error many times and it can be quite hard to track down...
Basically, what hibernate is saying is that you have two objects which have the same identifier (same primary key) but they are not the same object.
I would suggest you break down your code, i.e. comment out bits until the error ...
How to change MySQL data directory?
...r/mysql
# Stop MySQL before copying over files
service mysql stop
# Copy all files in default directory, to new one, retaining perms (-p)
cp -rp /var/lib/mysql/* /new/dir/for/mysql/
Edit the /etc/my.cnf file, and under [mysqld] add this line:
datadir=/new/dir/for/mysql/
If you are using CageF...
How do I import global modules in Node? I get “Error: Cannot find module ”?
I am trying to setup Node on Mac OSX Lion. It all seems to work ok, but I can't seem to import anything modules from my global modules folder. I get the error,
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Resolving conflicts: how to accept “their” changes automatically?
...
Use
hg resolve -t internal:other --all
to accept theirs and
hg resolve -t internal:local --all
to accept yours
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Xcode : failed to get the task for process
...eck that this is done in both the Project and Target build settings (especially Target has the highest priority, so if you like me spend 30 minutes by changing the Project and you didn't realize the Target was different, you will learn this...)
– viggio24
May 5...
Test whether a glob has any matches in bash
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If find feels like overkill and the number of files likely to match is small, use stat:
if stat -t glob* >/dev/null 2>&1
then
echo found
else
echo not found
fi
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IntelliJ - Convert a Java project/module into a Maven project/module
...ou mean adding source repository elements, I think you need to do that manually–not sure.
Pre-IntelliJ 13 this won't convert the project to the Maven Standard Directory Layout, 13+ it will.
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