Posts Tagged ‘Java’
I had an interesting discussion with a colleague of mine regarding the differences between the proxy and the decorator pattern which made me give it some thought. To the untrained eye (that includes my eye!), they seem exactly the same. Infact you sometimes wonder, why the heck are there two names for the same pattern. [...]
It’s ironic the stuff we get used to as developers. There’s so much we do repeatedly in every class or in every project or maybe even in every method yet we never realize that it’s probably best to add a new “feature” to java to make our life easier. While searching for some reading material [...]
In-memory cache’s can be extremely useful for small web applications where you don’t want to full-blown cache system like ehCache or simply can’t afford one. I recently had such a requirement and I must say that I kind of made a mess of it. The requirement was to cache User objects so that we didn’t [...]
I hate writing pagination code. Infact I hate it so much, I try not to paginate my lists at all. ( I know, i know, very bad on my part) . Writing pagination code totally destroys the code reuse in an application, developers generally just copy paste the very same pagination code all over the [...]
I have noticed a lot of people on the internet asking about method inlining. The term generally arises whenever the final keyword is discussed. Basically, it is said that compilers inline methods which are declared final thereby avoiding the cost of putting them on the stack etc and thus improving performance drastically under heavy load [...]
I wish spring security would work on their documentation and tell people how easy it is to implement a custom service for loading user details. You don’t HAVE to use JDBC to do that, you can write your very own hibernate, toplink or whatever DAO to do just that. It’s important to realise that spring-security [...]
Form validation is an integral part of any web application. While most developers rely on client side validations, the good ones always perform server side validations as well before accepting any data. You never know what kind of a malicious attack/vulnerability might be exposed if you don’t validate all data. Submitting, validating and then returning [...]
In my earlier article I had detailed how to get DWR working with spring. Once you get that done, how exactly do you use it? Even though DWR provides a very powerful debugging page, a real-world example never hurts. I’ll construct a simple page which will present the user with a list of countries (populated [...]
So I managed to configure spring security in my last article here but what do I do now. How do I create the login form, login.jsp for my users to authenticate from. I searched around and found a few articles but none that listed out the login page. Then I looked in the spring-security distribution
I have written another post listing how to construct your login and logout pages to work with spring-security. It’s important that you read this post first if you’re new to spring-security. Security in web applications is a big concern. More often than not developers miss securing a few pages here and there. These pages aren’t [...]
I like DWR, it’s a very strong framework for enriching your simple web application with ajax. It’s particularly useful for java developers because no one likes to write javascript to make XMLHttpRequest’s to call the server, parse the response and then set stuff in your jsp so that the response is displayed in a proper [...]
A question commonly asked on the spring forums is that a service makes calls to multiple DAOs, how can ALL the calls be rolledback if any of the calls throws an exception. The simplest way to do this is to make your service transactional while keeping your DAOs non-transactional. Example Service : Notice the lack [...]
More often than not you need your java program to perform an operation at a particular time. It gets trickier when the operation needs to be performed at regular intervals. There are a lot of solutions to implement a java “cron” of sorts available. There’s the quartz scheduler which has pretty much everything that you [...]
Spring Framework is by the most versatile framework for java applications. It can be used with any kind of application, be it an applet, a swing app or a web application. Spring transaction management is one of the most powerful features of spring. It manages your transactions for you with minimal code, infact all you [...]
I’m asked the difference between the two interfaces, Serializable and Externalizable more often than i’d like. It’s pretty simple really. Serializable does all the dirty work for you, it writes the object to the output stream on it’s own without you having to bother about anything at all. Externalizable on the hand makes you do [...]