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What causes java.lang.IncompatibleClassChangeError?

...out recompiling the client code. Java Language Specification §13 details all such changes, most prominently, changing non-static non-private fields/methods to be static or vice versa. Recompile the client code against the new library, and you should be good to go. UPDATE: If you publish a public...
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What exactly is a C pointer if not a memory address?

... The C standard does not define what a pointer is internally and how it works internally. This is intentional so as not to limit the number of platforms, where C can be implemented as a compiled or interpreted language. A pointer value can be some kind of ID or handle or a combin...
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Get the Row(s) which have the max count in groups using groupby

How do I find all rows in a pandas dataframe which have the max value for count column, after grouping by ['Sp','Mt'] columns? ...
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How do I update a Python package?

I'm running Ubuntu 9:10 and a package called M2Crypto is installed (version is 0.19.1). I need to download, build and install the latest version of the M2Crypto package (0.20.2). ...
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How to force Chrome's script debugger to reload javascript?

I really like the ability to edit javascript in the chrome debugger however, I find that it can be really problematic getting the debugger to re-fetch the JavaScript from the server. ...
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How can I get a count of the total number of digits in a number?

... @Puterdo Borato: my performance test actually showed that your method is faster when the number of digits are < 5. Pass that, Steve's Math.floor is faster. – stack247 Apr 7 '15 at 22:56 ...
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When do you use varargs in Java?

...lso can receive an indeterminate number of objects but a varargs parameter allows more flexibility and convenience at the point of invocation. You can write code to build an array and pass it, or you can let Java do it for you when you choose to receive it in a varargs parameter. ...
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How to prevent logback from outputting its own status at the start of every log when using a layout

...set the debug attribute of the configuration element to true, you will get all status information to the console. If this is your problem, just set it to false or remove it. If you have any configuration problems of level WARN or above, you will also get all status information logged to the console...
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Master-master vs master-slave database architecture?

...t seems to offer everything, no single point of failure, everyone can work all the time. The trouble with this is that it is very hard to preserve absolute consistency. See the wikipedia article for more. Wikipedia seems to have a nice summary of the advantages and disadvantages Advantages ...
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How to create a printable Twitter-Bootstrap page

... type="text/css" media="print" href="print.css"> or one you share for all devices: <link rel="stylesheet" type="text/css" href="bootstrap.min.css"> # Note there's no media attribute Then, you can write your styles for printers in the separate stylesheets or in the shared one using medi...