Using @ConfigurationProperties in Spring Boot

In my latest blog post I described shortly how one can configure mail in Spring Boot application. To inject properties…

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Testing mail code in Spring Boot application

Whilst building a Spring Boot application you may encounter a need of adding a mail configuration. Actually, configuring the mail…

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Validation groups in Spring MVC

Validation constraints in Bean Validation may be added to one or more groups via groups attribute. This allows you to…

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Spring MVC Integration Testing: Assert the given model attribute(s) have global errors

In order to report a global error in Spring MVC using Bean Validation we can create a custom class level…

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Spring 4.1 and Java 8: java.util.Optional

As of Spring 4.1 Java 8’s java.util.Optional, a container object which may or may not contain a non-null value, is…

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JUnit: testing exception with Java 8 and Lambda Expressions

In JUnit there are many ways of testing exceptions in test code, including try-catch idiom, JUnit @Rule, with catch-exception library.…

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Spring 4: CGLIB-based proxy classes with no default constructor

In Spring, if the class of a target object that is to be proxied doesn’t implement any interfaces, then a…

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Better error messages with Bean Validation 1.1 in Spring MVC application

Bean Validation 1.1, among many new features, introduced error message interpolation using Unified Expression Language (EL) expressions. This allows to…

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Lambda Expressions and Stream API: basic examples

This blog post contains a list of basic Lambda expressions and Stream API examples I used in a live coding…

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