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java Programming Glossary: frequentlyUnderstanding JSF as a MVC framework http://stackoverflow.com/questions/10111387/understanding-jsf-as-a-mvc-framework it's the FacesServlet . Especially the last part is frequently not well understood In JSF you don't implement a controller...
how to make a composite primary key (java persistence annotation) http://stackoverflow.com/questions/1212058/how-to-make-a-composite-primary-key-java-persistence-annotation lot of headaches down the road as you'll find out when you frequently have to reference map the composed primary key. I found this..
How and where are Annotations used in Java? http://stackoverflow.com/questions/1372876/how-and-where-are-annotations-used-in-java an annotation is used to describe the element which is frequently referred as its semantics . Prior to JDK5 the information that.. needed to be stored somewhere else and XML files were frequently used. But it is more convenient to use annotations because they..
Using a JFileChooser with Swing GUI classes and listeners http://stackoverflow.com/questions/15728619/using-a-jfilechooser-with-swing-gui-classes-and-listeners but that can respond in the same way. I've also used them frequently to help create mock classes that allow me to better test my..
Java operator precedence guidelines http://stackoverflow.com/questions/2137690/java-operator-precedence-guidelines Misunderstanding Java operator precedence is a source of frequently asked questions and subtle errors. I was intrigued to learn..
Why did java have the reputation of being slow? [closed] http://stackoverflow.com/questions/2163411/why-did-java-have-the-reputation-of-being-slow libraries including the standard ones will create Strings frequently rather than reusing mutable or simpler formats char or StringBuffer..
Can an abstract class have a constructor? http://stackoverflow.com/questions/260666/can-an-abstract-class-have-a-constructor subclasses must be specified. Abstract constructors will frequently be used to enforce class constraints or invariants such as the..
How to deal with “java.lang.OutOfMemoryError: Java heap space” error (64MB heap size) http://stackoverflow.com/questions/37335/how-to-deal-with-java-lang-outofmemoryerror-java-heap-space-error-64mb-heap rewrite some of my code to persist objects to file system frequently using database is the same thing to free up the memory. It could..
http://stackoverflow.com/questions/435553/java-reflection-performance and should be avoided in sections of code which are called frequently in performance sensitive applications. Here's a simple test..
http://stackoverflow.com/questions/490091/java-generics together and you'll see the following line of code very frequently List String L new ArrayList String You should read that as L..
What optimizations can I expect from Dalvik and the Android toolchain? http://stackoverflow.com/questions/4912695/what-optimizations-can-i-expect-from-dalvik-and-the-android-toolchain eliminating the repeated interpreter parsing overhead on frequently executed code paths. That said we do have quite a few local..
What's the difference between ConcurrentHashMap and Collections.synchronizedMap(Map)? http://stackoverflow.com/questions/510632/whats-the-difference-between-concurrenthashmap-and-collections-synchronizedmap
Converting an array of objects to an array of their primitive types http://stackoverflow.com/questions/564392/converting-an-array-of-objects-to-an-array-of-their-primitive-types Unfortunately this is something we have to do quite frequently when interfacing between Hibernate and some third party libraries..
Should I use Java date and time classes or go with a 3rd party library like Joda Time? http://stackoverflow.com/questions/589870/should-i-use-java-date-and-time-classes-or-go-with-a-3rd-party-library-like-joda update the timezone database which does change relatively frequently It has a good immutability story which makes life a lot easier..
The case against checked exceptions http://stackoverflow.com/questions/613954/the-case-against-checked-exceptions exceptions should not be used on an API call that is made frequently by the client. By frequently I mean from a lot of places in.. on an API call that is made frequently by the client. By frequently I mean from a lot of places in the client code not frequently.. I mean from a lot of places in the client code not frequently in time. So a client code doesn't tend to try to open the same..
Creating a memory leak with Java http://stackoverflow.com/questions/6470651/creating-a-memory-leak-with-java containers like Tomcat can leak memory like sieve if you frequently redeploy applications that happen to use ThreadLocals in any..
Sorting Java objects using multiple keys http://stackoverflow.com/questions/8036429/sorting-java-objects-using-multiple-keys return d1.name.compareTo d2.name Well I do this quite frequently but this solution doesn't smell right. It doesn't scale well..
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