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Everyone knows that primary keys need for identifying rows (subjects) in database tables and for tables linking.
And databases are indifferent to what thees keys are in their nature.
But circumstances are not.
So why do you still use artificial autoincremented primary keys?
Continue readingTechnical aspects of testing applications written on top of Spring Cloud Gateway
Continue readingApache Kafka – is an open-source distributed event streaming platform used by thousands of companies for high-performance data pipelines, streaming analytics, data integration, and mission-critical applications.
It is not the secret that Apache Kafka became a standard of communication between microservices last time.
Becoming a standard entails the need for proper operation and using.
The hint of being proper used is to provide every message sent to Kafka with version information. And here is why.
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Are you familiar with Java Validation API? And Spring validation? (if not, take a look at the end of this article for links to read)
In my practice I had an interesting case. The task was to implement an web endpoint accepting the request which body consisted of three fields. And only one of them must be specified at the time.
Continue readingThere are many patterns to help with software design. The Gang-of-Fourth provides us with patterns to organize the code better. Enterprise Integration patterns (EIP) are the other list of patterns. They helps us with communications between applications.
One of EIP is Request-Reply.
It is very simple. When one service needs in some data it sends a Request to the other service which is responsible of such data. Then responsible service prepares an Response and provides the Requestor with it.
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Most of Enterprise projects are about money. And most of them implement an API.
API implements the way the datum are migrating from one application to another one. The money consists of an amount and a currency. The amount may be fractional.
So this post is about how to deal with fractional amount of money when implementing an API in Java.
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Standard OpenFeign logger provides the only approach to log communications — it logs every header in separated log entries, the body goes into another log entry.
It is very inconvenient to deal with such logs in production especially in multithreaded systems.
‘Normalized Logger’ is intended to combine all log entries related to one request-reply communication into one log entry.
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