AWS Glue is a fully managed ETL (extract, transform, and load) service that makes it simple and cost-effective to categorize your data, clean it, enrich it, and move it reliably between various data stores and data streams. AWS Glue consists of a central metadata repository known as the AWS Glue…

Executer

Atomic As we know, there is a race condition in threads and we use the synchronized keyword to solve it. This is a somewhat expensive way, but it is not desired to be used much. That’s why atomic classes are used.

You must have used Mustache to read email templates or some resources. But mustache can read and cache the files in the jar. Let’s assume that these files (email templates, messages resources) need to be changed when are in the jar, but we don’t want to build&deploy our microservice. So…

As we are working on many microservices in many environments. It’s getting hard to monitor all of them. We could have many questions such as “A microservice is down? which microservice version is working? I need to investigate logs but How can I change the log level? I changed the…

As you know, we continue to investigate Java8 features. That’s why today’s subject is Exception Handling. MultiCatch Exception This feature came from Java7. If we want to use multi-catch, you need to pay attention to the IS-A relation. Because we can not use these relations. For example, FineNotFoundException IS-A IOException. …

As you know, most backend developers encounter NullPointerException. To solve this, we often set up a null check structure. With Optional class, there is no need for this. This class has various utility methods to facilitate code to handle values as ‘available’ or ‘not available’ instead of checking null values.

What we need to know about Stream API It is another top subject that comes with Java 8. It added java.util.stream with Java8. A stream in Java is a sequence of data. A stream pipeline is the operations that run on a stream to produce results. The pipeline has three…

BiFunction The lambda expression assigned to an object of BiFunction type is used to define its apply() which eventually applies the given function on the arguments. R apply(T t, U u); The main advantage of using a BiFunction is that it allows us to use 2 input arguments while in function…