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Choosing a Java Web Framework now? [closed]

we are in the planning stage of migrating a large website which is built on a custom developed mvc framework to a java based web framework which provides built-in support for ajax, rich media content, mashup, templates based layout, validation, maximum html/java code separation. Grails looked like a...
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Implementing slicing in __getitem__

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JavaScript - onClick to get the ID of the clicked button

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Using arrays or std::vectors in C++, what's the performance gap?

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How to read a file in reverse order?

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How to implement onBackPressed() in Fragments?

Is there a way in which we can implement onBackPressed() in Android Fragment similar to the way in which we implement in Android Activity? ...
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Git fast forward VS no fast forward merge

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ViewController respondsToSelector: message sent to deallocated instance (CRASH)

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Why is extending native objects a bad practice?

...ader says that extending the native objects is a bad practice. But why? Do we get a perfomance hit? Do they fear that somebody does it "the wrong way", and adds enumerable types to Object , practically destroying all loops on any object? ...
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multi-layer perceptron (MLP) architecture: criteria for choosing number of hidden layers and size of

If we have 10 eigenvectors then we can have 10 neural nodes in input layer.If we have 5 output classes then we can have 5 nodes in output layer.But what is the criteria for choosing number of hidden layer in a MLP and how many neural nodes in 1 hidden layer? ...