heartin's blog

Technology Focus At JavaJee For Coming Days

Technologies and methodologies changes over time. Also, the expectations and requirements from you change over the years. So we may have to learn new things and improve ourselves. I will list out few things that I will be focusing on in coming days, weeks and months, and hence you will see notes/training/meetups corresponding to them here.

Unit Testing Concurrency Code in Spring

Will list our common issues, tips and tricks for unit testing concurrency code written in Spring. You will usually be using a unit testing framework such as JUnit or TestNG.

Introduction to Caching Support in Spring Framework

Spring Framework provides support for transparently adding caching into an existing Spring application, with minimal impact on the code, similar to the transaction support. Spring also makes good use of annotations. This note is a summary of Spring’s documentation (see reference) on Caching, for quick reading and reference.

Introduction to Caching

A cache is a hardware or software component that stores data so future requests for that data can be served faster; the data stored in a cache might be the result of an earlier computation, or the duplicate of data stored elsewhere. A cache hit occurs when the requested data can be found in a cache, while a cache miss occurs when it cannot. Cache hits are served by reading data from the cache, which is faster than recomputing a result or reading from a slower data store. (Ref=Wikipedia)

App Restart with Spring Boot Developer Tools

The devtools module adds tools that can make the application development easier. This includes automatically apply sensible development-time configuration for features such as caching as caching can be counterproductive during development, auto restarting after changes etc. To include devtools support, we need to add spring-boot-devtools dependency to the build file.

A Quick Comparison of YAML with Properties File

YAML is a human friendly data serialization standard, which is mainly made for configuration files. YAML stands for YAML Ain't Markup Language. YAML can be used with many programming languages.

Externalized Configuration with Spring Boot

Spring Boot makes Spring configurations easier and safer.  Spring Boot supports formats such as YAML as well as the .properties file, for externalized configuration. YAML is a human friendly data serialization standard, which is mainly made for configuration files. YAML stands for YAML Ain't Markup Language.

Spring Boot Auto Configuration Tips and Tricks

  1. EnableAutoConfiguration annotation attempt to guess and configure beans that you are likely to need. Auto-configuration classes are usually applied based on the presence or absence of, files or libraries in your classpath, beans you have defined, and properties.  Auto-configuration is always applied after user-defined beans have been registered.

Spring Boot Command Line Runner for Building Command Line Utility

If you need to run some specific code once the SpringApplication has started, you can implement the ApplicationRunner or CommandLineRunner interfaces. Both interfaces work in the same way and offer a single run method which will be called just before SpringApplication.run(…​) completes.


The CommandLineRunner interfaces provides access to application arguments as a simple string array, whereas the ApplicationRunner uses the ApplicationArguments interface.


Logging with Spring Boot

Spring Boot has no mandatory logging dependency, except for the Commons Logging API, of which there are many implementations to choose from.



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