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Why am I getting a NoClassDefFoundError in Java?
I am getting a NoClassDefFoundError when I run my Java application. What is typically the cause of this?
27 Answers
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What are valid values for the id attribute in HTML?
When creating the id attributes for HTML elements, what rules are there for the value?
23 Answers
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Pagination in a REST web application
This is a more generic reformulation of this question (with the elimination of the Rails specific parts)
13 Answers
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How to parse/format dates with LocalDateTime? (Java 8)
Java 8 added a new java.time API for working with dates and times ( JSR 310 ).
7 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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What is the use of making constructor private in a class?
Why should we make the constructor private in class? As we always need the constructor to be public.
23 Answers
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When to use Vanilla JavaScript vs. jQuery?
I have noticed while monitoring/attempting to answer common jQuery questions, that there are certain practices using javascript, instead of jQuery, that actually enable you to write less and do ... well the same amount. And may also yield performance benefits.
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Difference between
What is the difference between List<? super T> and List<? extends T> ?
14 Answers
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How to find list intersection?
actual output: [1,3,5,6]
expected output: [1,3,5]
11 Answers
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SQL keys, MUL vs PRI vs UNI
What is the difference between MUL , PRI and UNI in MySQL?
4 Answers
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