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Why is my Spring @Autowired field null?

...sn't know about the copy of MileageFeeCalculator that you created with new and didn't know to autowire it. The Spring Inversion of Control (IoC) container has three main logical components: a registry (called the ApplicationContext) of components (beans) that are available to be used by the applica...
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Gulps gulp.watch not triggered for new or deleted files?

...w. It did not when the question was asked. The rest of my answer still stands: gulp-watch is usually a better solution because it lets you perform specific actions only on the files that have been modified, while gulp.watch only lets you run complete tasks. For a project of a reasonable size, thi...
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How to group dataframe rows into list in pandas groupby?

I have a pandas data frame df like: 12 Answers 12 ...
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How to get default gateway in Mac OSX

... when Time Warner's modem decided it wanted the IP my router used to have, and ifconfig lied about the gateway. – Chris Doggett Jun 20 '13 at 3:05 add a comment ...
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Is Java Regex Thread Safe?

I have a function that uses Pattern#compile and a Matcher to search a list of strings for a pattern. 5 Answers ...
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What is the logic behind the “using” keyword in C++?

...aration. The identifier following the using keyword becomes a typedef-name and the optional attribute-specifier-seq following the identifier appertains to that typedef-name. It has the same semantics as if it were introduced by the typedef specifier. In particular, it does not define a new type and ...
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jquery - return value using ajax result on success

...ou can not return a value from an asynchronous call, like an AJAX request, and expect it to work. The reason is that the code waiting for the response has already executed by the time the response is received. The solution to this problem is to run the necessary code inside the success: callback. ...
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How to split a column into two columns?

I have a data frame with one column and I'd like to split it into two columns, with one column header as ' fips' and the other 'row' ...
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How to force keyboard with numbers in mobile website in Android

I have a mobile website and it has some HTML input elements in it, like this: 7 Answers ...
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What is the fastest way to check if a class has a function defined?

I'm writing an AI state space search algorithm, and I have a generic class which can be used to quickly implement a search algorithm. A subclass would define the necessary operations, and the algorithm does the rest. ...