Spring Security And Authorization

In a Java Web application, where authorization is involved, roles come into the picture. If a request is authorized to access a particular resource, then only will the Servlet Container allow it to work with the resource. How is the authorization decision made ?

Remember Me... Spring Security

Login page in most web applications have a small check-box that says "Remember Me". Nothing new there. The cool part is spring security comes with this functionality ready made.
I decided to use the default login form to test the feature:

The Identity Hash Map

If we work with Maps in java than the keys need to implement equals and hashcode - Right ? Actually Wrong.

Enums as the key in Map

In the previous post we saw how EnumSet is an optimized collection built for use with Enums. While I genuinely struggled to come up with scenarios where I could need a set of enums, I have often come across and used Enums as keys in my maps. Java has come up with an optimized collection for the above use case too - EnumMap.

A Set of Enums

Why would I need a collection Of Enums? Consider that we do have a simple enum:

public enum Rating {
   TOP, GOOD, PASSABLE, BAD, POOR, FAIL
}

Now if I want to get all the values I would call the Rating.values method. This would give me an array of Enums. Any reason why I would want a set of the same ?

Components in JPA

We have used components in Hibernate. They provide a very good technique for code reuse. They are also useful if we do now want to represent a particular table as Entity and give them their own separate life cycle. JPA also provides support for components.

Repeating and Delaying Tasks

The ExecutorService Interface is not the end of Executors. The package provides another specialized interface ScheduledExecutorService which is capable of executing tasks after a certain delay, or repeating tasks at fixed intervals.
I decided to test the interface.