Spring Integration Testing – WireMock and MQ

When writing integration tests for parts of the application that talk to other applications, for example calling REST APIs or sending JMS messages, sometimes we just want to test the application and not do end to end test. In this case, we would need to mock these other applications or their behavior. Mocking REST For…

IntelliJ auto import on copy-paste

Very nice feature of IntelliJ is auto-importing dependencies and dependencies cleanup (optimize imports), especially useful when copy pasting entire code blocks, deleting stuff etc… Here is a screenshot of where to enable the settings and a link to IntelliJ docs… Auto import Optimize imports

Multiple projects inside one IntelliJ instance

When you are working with multiple projects, for example a number of microservices, it becomes problematic to have an IntelliJ instance open for each of those. There is a trick that allows us to have multiple projects open inside one IntelliJ instance (this saves time, space and RAM :)). Basics steps are as follows: Create…

MapStruct

When working with Spring services and exposing REST API calls, you would usually want to have a set of customized objects exposed to the outside world. These objects, usually called DTOs, can expose some of the domain objects or some projection made out of domain objects (or something else). For mapping between domain data objects…

Multi-stage docker images

When working with docker images, it would be a good idea to keep the final image (especially for production) as small as possible. Usually, when building apps, there are a lot of extra stuff included that are really not necessary for the final image. This can be most obvious with Spring Boot applications, where build…

Start Tomcat as a Windows service in the debug mode

From the tomcat/bin directory, start the tomcat exe or right click it to get to the properties. In the properties dialog, click the Java tab and BEFORE all of the -D options, add something like this: Make sure they are first on the list and each in their own line. From then on, Tomcat should…