Paulo Rendeiro

JUnit and Mockito handbook

Paulo Rendeiro — Wed, 20 Jul 2016 21:23:16 +0000

One of the most important concepts to build a software with quality is the automated tests. Going deep into the automated tests, one of its most explored branches is the unit tests. This article will show an overview about unit tests and then a practical “JUnit and Mockito handbook”, presenting their most useful features and some usage examples. What…

Persisting enums using JPA attribute converter

Paulo Rendeiro — Mon, 18 Jul 2016 16:33:07 +0000

Before the JPA 2.1 specification be released in 2013 the simple task to persist and load enums could be performed but not in a simple and decent way. In this article I’m going to present you some old techniques to solve this problem and how the new JPA specification established an appropriate way for persisting…

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Java 8 Lambda expressions and exceptions

Paulo Rendeiro — Thu, 14 Jul 2016 16:38:09 +0000

Java 8 has introduced a lot of new features, many of them well known by other languages, like lambdas expressions. Lambdas are really useful when you are encapsulating a single unit of behavior that you want to pass to other code. For example, you would use a lambda expression if you want a certain action…

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Mocking the current date-time (properly) with Java

Paulo Rendeiro — Sat, 02 Jul 2016 00:45:16 +0000

It’s not unusual to face situations where we need to capture the current system’s date-time in order to calculate some future date, make validations and so on. The problem generally appears as soon as we need to check whether some calculated date was correctly generated or not. When we directly use the instruction “new Date()”…

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(Português do Brasil) Salvando o resultado de consultas MySQL em arquivos CSV

Paulo Rendeiro — Sun, 10 Jun 2012 23:54:45 +0000

Sorry, this entry is only available in Brazilian Portuguese. For the sake of viewer convenience, the content is shown below in the alternative language. You may click the link to switch the active language. Uma característica meio desconhecida do MySQL, também presente em outros bancos de dados como o Oracle, é a de exportar o…

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