We are continuing with the new part of the series. In this part, we will explore collecting elements that is produced after series of stream operations. Collecting resultant elements: collect When are working over collections, we may want to create a new collections from that collection after doing some filtering…

In Spring, we may need some 3rd party beans in our applications like object mappers, password encoders etc. To use them, we create those beans in our configuration class as follows. @Configuration public class BeanConfig { @Bean public ObjectMapper objectMapper() { return new ObjectMapper(); } } Above one is actually…

We are continuing with the new part of the series. In this part, we will explore mapping operations using map and flatMap functions. We will use the following 2 models in the examples. // lombok annotations used @Getter @Setter public class Team { private String name; private…

In this series, we are going to see examples on traditional Java codes and their Stream versions. We will start off by fundamentals in this first part and later, it will be getting a bit more advanced on every part. Iterating over elements of a list: forEach private static void…

In this series, I will write short tutorials and tips for Java environment including Spring Boot, Spring Cloud, microservices, testing. First one will be about terminating executor services. Shutting down executor service gracefully Executor services are important part of multi-threaded applications. They let you easily execute your tasks concurrently with…

In this article, we are going to look deep into why we should use parent for our Java projects especially those composed of multi-modules like microservice projects. When we start a new project, most probably it will require different functionalities which we will not be keeping in a single module…

In this article, we are going to talk about why we should use config server, how to set it up and secure it. One of the important patterns of microservice architecture is externalized configuration. Imagine we have a lot of services each of which uses different configurations to handle some…

In this article, we are going to cover one of the essential topics of java, null handling, and we are going to do this with Optionals that was introduced in Java 8 and we will be doing that in full detail with examples. We are going to create Optional returning…

In this post, I am going to talk about loading initial data to our database for later use in our Spring Boot application. Firstly, let’s look at why we may need initial data. First use case is that after application started, we may be in need of data already created…