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Why does Hibernate require no argument constructor?
...r proper dependency injection and for rich object behaviour). Furthermore, Java reflection allows you to create objects without using newInstance(). The method getDeclaredConstructors has been in the reflection API since JDK 1.1. It's terrifying that the JPA spec designers neglected this.
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Groovy / grails how to determine a data type?
...add another option to Dónal's answer, you can also still use the good old java.lang.Object.getClass() method.
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Understanding scala enumerations
...orth. With Scala 2.10, there are some ideas how enumerations (which unlike Java are not a language construct but just a library solution) can be written better using macros.
– 0__
Jun 16 '12 at 22:29
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Learning Regular Expressions [closed]
... however you like.
Tools for writing and debugging regexes:
RegExr (for JavaScript)
Perl: YAPE: Regex Explain
Regex Coach (engine backed by CL-PPCRE)
RegexPal (for JavaScript)
Regular Expressions Online Tester
Regex Buddy
Regex 101 (for PCRE, JavaScript, Python, Golang)
Visual RegExp
Expresso (f...
Jackson Vs. Gson [closed]
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Jackson and Gson are the most complete Java JSON packages regarding actual data binding support; many other packages only provide primitive Map/List (or equivalent tree model) binding.
Both have complete support for generic types, as well, as enough configurabilit...
What is the difference between an interface and abstract class?
...ometimes untrue. Sometimes, they are not even what you think they are.
In Java, this rule is strongly enforced, while in PHP, interfaces are abstract classes with no method declared.
In Python, abstract classes are more a programming trick you can get from the ABC module and is actually using meta...
Scale Image to fill ImageView width and keep aspect ratio
...ll be 0 and your viewSideRatio will result in Infinity (no need to wonder, Java float allows such values.) In this case both your height and width will be 0.
– Alex Semeniuk
Nov 22 '13 at 13:20
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How to convert comma-separated String to List?
Is there any built-in method in Java which allows us to convert comma separated String to some container (e.g array, List or Vector)? Or do I need to write custom code for that?
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HashMap get/put complexity
...s to the same bucket, thus O(N) if each bucket is backed by a List.
since Java 8, HashMap dynamically replaces the Nodes (linked list) used in each bucket with TreeNodes (red-black tree when a list gets bigger than 8 elements) resulting to a worst performance of O(logN).
But, this in NOT the full...
Clojure 1.2.1/1.3/1.4 'proxy generated in Grails 2.0.0 runtime fails. 1.2.0 is fine
... for ClassCastException: clojure.lang.PersistentArrayMap cannot be cast to java.lang.Class issue
The problem is:
that the compiler injects an incorrect cast to
clojure.lang.PersistentHashMap. In this case it should probably be
cast to a clojure.lang.Associative, the highest common interface...