What is a postfix expression? An expression where in the operator is placed after the operands is called a postfix expression. For example an expression (also called infix expression) 2 + 3 in postfix is 2 3 +, expression 2… Read More ›
Java
Gotcha: Migrating from Spring Security 3.2.x to Spring Security 4.x
Here is a simple gotcha to keep in mind while migrating to newer Spring Security version 4.x from Spring Security 3.2.x What’s the problem? The Spring security configuration expressions hasRole(‘role_name’) and hasAuthority(‘role_name’) are no longer the same. The catch is:… Read More ›
New @RequestParam annotations in Spring Boot 1.4 (Spring Framework 4.3)
Earlier in Spring/Spring Boot to Map a GET or POST or DELETE or any HTTP method request handler we would write something like below: But with Springframework 4.3 and Spring Boot 1.4 (which now uses Springframework 4.3) we have some… Read More ›
Java Gotcha: Parse string using SimpleDateFormat with months greater than 12
I was the other day trying to parse a date string into a date object using SimpleDateFormat to check for the validity of the date string. I had the SimpleDateFormat defined as: SimpleDateFormat expiryDateFormat = new SimpleDateFormat(“dd/MM/yyyy”);. The date string… Read More ›
Getting rid of Getters and Setters in your POJO
We all have read in Java books about encapsulation of fields in Java class and also when ever you code you are asked to take special care in encapsulating the fields and providing explicit Getters and Setters. And these are… Read More ›
Using Google Guava Cache for local caching
Lot of times we would have to fetch the data from a database or another webservice or load it from file system. In cases where it involves a network call there would be inherent network latencies, network bandwidth limitations. One… Read More ›
Book Review: Murach’s Java Servlets And JSP 3rd Edition
Murach’s Java Servlets and JSP is the ONLY book you need to learn Web App Development in Java using JSP and Servlets. The book covers all the concepts required you to build a complete Web application in Java. You will… Read More ›
Simple Aspect Oriented Programming (AOP) using CDI in JavaEE
We write service APIs which cater to certain business logic. There are few cross-cutting concerns that cover all service APIs like Security, Logging, Auditing, Measuring Latencies and so on. This is a repetitive non-business code which can be reused among… Read More ›
Book Review: Java Performance by Charlie Hunt and Binu John
If you want to: – learn about commands used for OS monitoring – understand about different components of JVM – monitor and tune JVM to improve its performance. then, Java Performance is the book you should be picking. This book… Read More ›
Getting started with Mocking in Java using Mockito
We all write unit tests but the challenge we face at times is that the unit under test might be dependent on other components. And configuring other components for unit testing is definitely an overkill. Instead we can make use… Read More ›
