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Arnold Galovics

Being a good software engineer is 3% talent, 97% not being distracted by the internet.

Customizing each request with Spring Cloud Feign

 February 19, 2018May 25, 2018

Recently I wrote an article  how to explicitly pass headers via Feign clients. Now I’ll show you how to customize each request sent via Feign clients, like adding headers to Continue reading

 1 Comment Tagsfeign, spring, spring-cloud, spring-cloud-netflix

Passing headers with Spring Cloud Feign

 February 15, 2018

Feign is a great way to communicate between services. Spring Cloud has it’s own way of defining Feign clients, it’s done with Spring MVC annotations. Usually it’s a common requirement Continue reading

 1 Comment Tagsfeign, spring, spring-boot, spring-cloud, spring-cloud-netflix

How much projections can help?

 July 10, 2017May 25, 2018

For one of my presentations, I wanted to have some numbers regarding the efficiency of projections. If you don’t know what projections are, read this previously written article. I basically Continue reading

 2 Comments Tagshibernate, jpa, measurement, performance, spring, spring-data, spring-data-jpa

Configuring a datasource-proxy in Spring Boot

 June 26, 2017August 4, 2017

Have you ever heard about datasource proxies? No worries, it’s not complicated at all. Let’s say you want to access the database from an application. First you have to configure Continue reading

 20 Comments Tagsdatabase, spring, spring-boot

The detaching pitfall of declarative transaction management with Spring and JPA/Hibernate

 May 15, 2017

Anyone who is familiar with Spring and JPA knows about the magical  @Transactional annotation which helps us to focus on the business logic rather than programming transactions around. This approach is so Continue reading

 2 Comments Tagsjpa, spring, spring-core

Using projections in your data-access layer

 March 14, 2017

If you care about your data-access layer to make it as fast as possible, you should consider using projections for reading data. Check a simple example together. We have cities Continue reading

 2 Comments Tagshibernate, java, jpa, spring, spring-data, spring-data-jpa, sql

LazyInitializationException demystified

 February 27, 2017

Are you a Hibernate user? Have you ever got a LazyInitializationException? Let’s clarify this topic a bit. You can find plenty of solutions for the exception, however they lack explanation and Continue reading

 2 Comments Tagsdatabase, hibernate, java, jpa, lazy-loading

Google OAuth with Spring Security as separated Resource Server

 February 5, 2017February 5, 2017

There are a lot of great articles out there about OAuth 2.0, Spring Security, REST especially when you are about to have both the Resource and the Authorization server in Continue reading

 19 Comments Tagsgoogle, oauth, resource-server, rest, spring, spring-security

Technical debt – bad or good?

 September 26, 2016September 26, 2016

We often hear the phrase Technical Debt and usually the first thing we feel that it is a bad thing, something has been done in a wrong way. What is Continue reading

 Leave a comment TagsTechnicalDebt

Test or not to test package-private methods

 July 11, 2016

In a lot of interviews, I came across the question: “Why package-private visibility is useful?”. The usual answer from the candidates is “you can unit test that method individually because Continue reading

 1 Comment

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