In this post under Spring Core, I will show with example the purpose and how to use “@Component” and “@ComponentScan” annotation together. Till now in all my previous post, I have been defining a bean using “@Bean” annotation in an “@Configuration” annotated class as shown below package package1;import org.springframework.context.ApplicationContext;import org.springframework.context.annotation.AnnotationConfigApplicationContext;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;@Configurationpublic class Example1 {…… Continue reading Spring @Component and @ComponentScan annotation example
Accessing an environment variable
In this post under DotEnv, I will show with example how to access a particular environment variable. For example I have created “.env” file with below data. Env File MY_ENV_VAR1=some_value1 MY_ENV_VAR2=some_value2 Now to retrieve the value of environment variable “MY_ENV_VAR1” we call the non static “get” method of “DotEnv” class as shown below Main class…… Continue reading Accessing an environment variable
Loading .env files
In this post under DotEnv, I will show with example how to load a .env file. Below is the complete main class Main class 1 package defaultPackage; 2 3 import io.github.cdimascio.dotenv.Dotenv; 4 import io.github.cdimascio.dotenv.DotenvEntry; 5 6 public class Example1 { 7 public static void main(String[] args) { 8 Dotenv dotenv = Dotenv.load(); 9 for(DotenvEntry entry…… Continue reading Loading .env files
Using @DependsOn annotation
In this post under Spring Core, I will explain with example the purpose and how to use the “@DependsOn” annotation. In an Object Oriented Programming, no object is an island, it depends on other objects to perform their job. When Spring loads the application context, it creates the beans in following order. If a bean…… Continue reading Using @DependsOn annotation
Using @Data annotation example
In this post under Lombok, I will explain with example the purpose and how to use “@Data” annotation. In all my previous posts under Lombok,1) if I need to add getter, setter I would add “@Getter” and “@Setter” annotation2) if I need to add toString method, I would add “@ToString” annotation3) if I need to…… Continue reading Using @Data annotation example
Using @Log annotation example
In this post under Lombok, I will show with example what is the purpose of “@Log” annotation and how to use it. In our software development, logging data (whether it is just an info, error, etc) to log files is important. These log data help developers to figure out what is happening in the application,…… Continue reading Using @Log annotation example
Using @AllArgsConstructor annotation example
In this post under Lombok, I will explain the purpose of “@AllArgsConstructor” annotation and how to use it. This annotation when added at class level, automatically creates a constructor with all the fields present in the class. If a field is annotated with “@NonNull” annotation, the automatically generated constructor code will add a null check…… Continue reading Using @AllArgsConstructor annotation example
Using @RequiredArgsConstructor and @NonNull annotation example
In this post under Lombok, I will explain with example what is the purpose of “@RequiredArgsConstructor” annotation and how to use it with “@NonNull” annotation. This annotation is applied at the class level and when applied it generates constructor with a parameter for each required fields. Note: It will also add a parameter for non-initialized…… Continue reading Using @RequiredArgsConstructor and @NonNull annotation example
Using @EqualsAndHashCode cacheStrategy example
In this post under Lombok, I will explain with example the purpose of “cacheStrategy” attribute of “@EqualsAndHashCode” annotation. Just for recap, the annotation “@EqualsAndHashCode” when annotated to a POJO class, it generates “equals” and “hashCode” methods. Whenever the “hashCode” method of a POJO class is called, the hash is computed. To avoid computing of hashCode…… Continue reading Using @EqualsAndHashCode cacheStrategy example
Using @EqualsAndHashCode doNotUseGetters attribute example
In this post under Lombok, I will explain with example the purpose of “doNotUseGetters” attribute of “@EqualsAndHashCode” annotation. In a POJO class, we usually have getter method to return a formatted value of the actual value. For example, if we have a requirement where a employee has salary information stored as decimal but if he…… Continue reading Using @EqualsAndHashCode doNotUseGetters attribute example
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