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Unable to install Maven on Windows: “JAVA_HOME is set to an invalid directory”

I followed the Maven tutorial to the letter but I still can't get Maven installed on Windows. 16 Answers ...
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How to change a nullable column to not nullable in a Rails migration?

I created a date column in a previous migration and set it to be nullable. Now I want to change it to be not nullable. How do I go about doing this assuming there are null rows in that database? I'm ok with setting those columns to Time.now if they're currently null. ...
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Load multiple packages at once

How can I load a bunch of packages at once with out retyping the require command over and over? I've tried three approaches all of which crash and burn. ...
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How to add custom method to Spring Data JPA

I am looking into Spring Data JPA. Consider the below example where I will get all the crud and finder functionality working by default and if I want to customize a finder then that can be also done easily in the interface itself. ...
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Constructor overloading in Java - best practice

There are a few topics similar to this, but I couldn't find one with a sufficient answer. 6 Answers ...
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Hibernate JPA Sequence (non-Id)

Is it possible to use a DB sequence for some column that is not the identifier/is not part of a composite identifier ? 19...
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Python: How to ignore an exception and proceed? [duplicate]

I have a try...except block in my code and When an exception is throw. I really just want to continue with the code because in that case, everything is still able to run just fine. The problem is if you leave the except: block empty or with a #do nothing, it gives you a syntax error. I can't use con...
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Copy a variable's value into another

I have a variable which has a JSON object as its value. I directly assign this variable to some other variable so that they share the same value. This is how it works: ...
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In Matlab, when is it optimal to use bsxfun?

My Question: I've noticed that a lot of good answers to Matlab questions on SO frequently use the function bsxfun . Why? ...
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How to list the properties of a JavaScript object?

Say I create an object thus: 16 Answers 16 ...