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What does JVM flag CMSClassUnloadingEnabled actually do?
...t the bottom of groovy.codehaus.org/Running: "Groovy creates classes dynamically, but the default Java VM does not GC the PermGen. If you are using Java 6 or later, add -XX:+CMSClassUnloadingEnabled -XX:+UseConcMarkSweepGC. UseConcMarkSweepGC is needed to enable CMSClassUnloadingEnabled."
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sqlalchemy: how to join several tables by one query?
...ording the relations, and the yield 3-tuples. The arguments to the query() call are essentially the select list in sqlalchemy.
– letitbee
Jan 17 '14 at 18:53
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Comparing date ranges
...-| equal start with end of comparison period
If your table has columns called range_end and range_start, here's some simple SQL to retrieve all the matching rows:
SELECT *
FROM periods
WHERE NOT (range_start > @check_period_end
OR range_end < @check_period_start)
Note the N...
Difference between java.util.Random and java.security.SecureRandom
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The standard Oracle JDK 7 implementation uses what's called a Linear Congruential Generator to produce random values in java.util.Random.
Taken from java.util.Random source code (JDK 7u2), from a comment on the method protected int next(int bits), which is the one that gener...
How to add Action Bar from support library into PreferenceActivity?
...anks, this works for me - i'd change new LinearLayout in the first inflate call to: (ViewGroup) getWindow().getDecorView().getRootView()
– ahmedre
Nov 5 '14 at 7:47
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Finding the type of an object in C++
...bject of type A as a parameter, so I have to accept an A. However, I later call functions that only B has, so I want to return false and not proceed if the object passed is not of type B.
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How to verify a method is called two times with mockito verify()
I want to verify if a method is called at least once through mockito verify. I used verify and it complains like this:
1 An...
Labels for radio buttons in rails form
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If you want the object_name prefixed to any ID you should call form helpers on the form object:
- form_for(@message) do |f|
= f.label :email
This also makes sure any submitted data is stored in memory should there be any validation errors etc.
If you can't call the form helper...
jQuery: checking if the value of a field is null (empty)
...f you want to check if the element exist at all, you should do that before calling val:
var $d = $('#person_data[document_type]');
if ($d.length != 0) {
if ($d.val().length != 0 ) {...}
}
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RESTful password reset
...)
You can't use HTTP DELETE through a form, so you'll have to make an AJAX call and/or tunnel the DELETE through the POST.
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