Checked & Unchecked Exceptions

|

Checked Exceptions
  • are subclasses of java.lang.Exception
  • need to be declared in a method or constructor's throws clause
Unchecked Exceptions
  • are subclasses of java.lang.RuntimeException
  • do not need to be declared in a method or constructor's throws clause

In the context of common transaction APIs, such as JTA or Spring transaction APIs;
any RuntimeException triggers rollback, and any checked Exception does not rollback the transaction.


Runtime
Rollback
Unchecked

Yorumlar

Yorum Gönder

Popular

Servlet

|
In Java EE world, Servlet simply is a web technology with which we can receive and handle the HTTP requests, create HTTP response and return that response back to the client. Servlet technology makes a basis for other Java web technologies on top of which other frameworks put their extensions. For example JSP, JSF, Spring MVC are such technologies which are uses Servlet technology at behind.  Servlets run on a web container such as Tomcat which provides the services on Java EE technology stack .  What is a servlet ? Servlet simply makes an object having HTTP-server functionality when its class extends HttpServlet class. A servlet is mapped to a URL to which clients request HTTP requests made to the URL is directed to the corresponding Servlet object Servlet implementation receives the request in the form of GET, POST, PUT or DELETE Servlet implementation runs a business logic and prepares an HTTP response and sends it back to the client just an HTTP server does Lif...
Devamı

Pretenders, Contenders and Liars

|
Life is a way to the uncertainity. This is an exact fact. In this uncertain journey, we meet kinds of people of having different behaviours, and generally label them according to their behaviours. In this writing, i will try to write my understanding of three of these labels; pretenders, contenders and liars. Pretenders A pretender is a kind of people who pretends :) It does not do what it seems to do. It does what it does not seem to do. We frequently meet pretenders in our daily life. And if we catch a person pretending, then we feel that is not sincere. Okay, then here is a question sincerely to ask yourself; do you ever find yourself pretending ? Contenders A contender is a person who has a goal to reach and do not hesitate to fight for that goal. So a contender is sincere ? Absolutely yes, you may be completely opposite to a contender, but if you know that it's a contender, then you know that it's sincere in its behaviours. And sure it is, if you trus...
Devamı

The Convergence of OpenJDK and the Oracle JDK

|
Resim
In 2018, Oracle changed the license of their JDK. Instead of a single JDK build available both for commercial and free users, they offered two different JDK builds: Oracle JDK (commercial), which can be used in development and testing for free, but you have pay to use it in production. Oracle Open JDK (open source), which can be used in any environment for free. JDK Builds There is only one set of source code for the JDK. It is hosted in Mercurial at OpenJDK. Anyone can take the source code, produce a build, and post it. So, Oracle created a certification process that should be used to ensure the build is valid. This certification is run by the Java Community Process, which provides a Technology Compatibility Kit (TCK or JCK as Java). If an organization produces an OpenJDK build that passes the TCK then that build can be described as "Java SE compatible". The most popular and famous builds are distributed by Red Hat, Azul and community-led Adopt OpenJDK. ...
Devamı