Trace http requests with Spring Actuator

List the last http request with ease Spring Actuator provides also a httptrace endpoint. You get the last HTTP request with /httptrace. After adding Spring Boot Actuator dependencies to your project dependencies, you have to expose the httptrace endpoint via your application.properties: In Spring Boot 2.0 the trace endpoint was renamed to httptrace. You can […]

Change your application log level with Spring Actuator

You can do it even at runtime 🙂 Spring Boot provides a loggers actuator endpoint for viewing and changing log levels at runtime. What do I need? Add the Spring Boot Starter Actuator to you pom.xml or build.gradleorg.springframework.boot:spring-boot-starter-actuator Expose at least the loggers endpoint in your application.propertiesmanagement.endpoints.web.exposure.include=loggers When exposed, you get all loggers details with /loggers: […]

Creating a generic array in Java

Generic array initialization Recently I work with CompletableFutures. I used the allOf method which takes a varargs as input. Based on the request, a couple of things had to be processed. So how do I create a generic array that I could use at CompletableFuture.allof()? Array.newInstance together with toArray() does the trick. This is my […]

Echo your REST calls with a echo service

Echo services are a simple tool for developing and testing When you implement a service are often in a situation where you have to call another web service, for example service B. And to complicate the situation, service B is not fully implemented or even not available. Than an echo service could make sense for […]

Counting active accounts with Metrics

Based on a request parameter in a servlet context Recently I had the task to report active accounts based on http requests. Here I’m going to show you my solution with Dropwizard Metrics. Basically I am using a servlet filter togehter with an counter. Each account has its own counter. So I have a ConcurrentHashMap […]