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How do you Force Garbage Collection from the Shell?
So I am looking at a heap with jmap on a remote box and I want to force garbage collection on it. How do you do this without popping into jvisualvm or jconsole and friends?
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grep using a character vector with multiple patterns
... test whether a vector of strings are present in an another vector or not, and to output the values that are present (the matching patterns).
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Java 8 List into Map
I want to translate a List of objects into a Map using Java 8's streams and lambdas.
21 Answers
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Unbalanced calls to begin/end appearance transitions for
...the real view controller, but you must have the tab bar controller present and dismiss.
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What purpose does a tag serve inside of a tag?
...e been on a "view source" spree lately on websites with interesting design and content. One of those websites, Squarespace , has blocks of <script> tags inside of a <noscript> tag, like so:
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Check if string begins with something? [duplicate]
I know that I can do like ^= to see if an id starts with something, and I tried using that for this, but it didn't work... Basically, I'm retrieving the url and I want to set a class for an element for pathnames that start in a certain way...
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Converting a date string to a DateTime object using Joda Time library
...the following format "04/02/2011 20:27:05" . I am using Joda-Time library and would like to convert it to DateTime object. I did:
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Using DISTINCT and COUNT together in a MySQL Query
... Updated the answer as it is close to become a great answer and it was syntactically incorrect.
– Rahul Tripathi
Sep 8 '14 at 10:20
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How do I restart a service on a remote machine in Windows? [closed]
...ently, I'm doing this via Remote Desktop. How can it be done from the command line on my local machine?
8 Answers
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Why do I get AttributeError: 'NoneType' object has no attribute 'something'?
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You have a variable that is equal to None and you're attempting to access an attribute of it called 'something'.
foo = None
foo.something = 1
or
foo = None
print(foo.something)
Both will yield an AttributeError: 'NoneType'
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