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Why is Java's SimpleDateFormat not thread-safe? [duplicate]
... and then calendar.add(..). If another thread invokes parse(..) before the completion of the first invocation, it will clear the calendar, but the other invocation will expect it to be populated with intermediate results of the calculation.
One way to reuse date formats without trading thread-safet...
cannot load such file — zlib even after using rvm pkg install zlib
...w do:
$ sudo apt-get install zlib1g-dev
$ rvm reinstall 1.9.3
[Edit] As commenter @chrisfinne mentions, on CentOS/RedHat based systems:
$ sudo yum install zlib-devel
$ rvm reinstall 1.9.3
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How safe is it to store sessions with Redis?
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Permission denied (publickey) when SSH Access to Amazon EC2 instance [closed]
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This error message means you failed to authenticate.
These are common reasons that can cause that:
Trying to connect with the wrong key. Are you sure this instance is using this keypair?
Trying to connect with the wrong username. ubuntu is the username for the ubuntu based AWS distribu...
gdb split view with code
...re, a split view where I can see and browse the code in addition to giving commands:
9 Answers
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Create a dictionary on a list with grouping
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198
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Git push to wrong branch
Working with git, after some 'commit', and a couple of 'push', I realized that am using the wrong branch !
3 Answers
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Android: How can I pass parameters to AsyncTask's onPreExecute()?
... than creating member variables because it simplifies the task invocation. Compare the code above with:
MyAsyncTask task = new MyAsyncTask();
task.showLoading = false;
task.execute();
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jQuery Scroll to bottom of page/iframe
... There's actually no need to get the element's height: stackoverflow.com/a/44578849/1450294
– Michael Scheper
Jun 16 '17 at 0:10
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