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Flogger Fluent Logging 1. Overview In this tutorial, we’re going to talk about the Flogger framework, a fluent logging API for Java designed by Google. 2. Why use Flogger? With all the logging frameworks that are currently in the market, like Log4j and Logback, why do we need yet another… Continue Reading flogger-logging
SLF4J Warning: Class Path Contains Multiple SLF4J Bindings 1. Overview When we use SLF4J in our applications, we sometimes see a warning message about multiple bindings in the classpath printed to the console. In this tutorial, we’ll try to understand why we see this message and how to resolve it.… Continue Reading slf4j-classpath-multiple-bindings
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Spring Performance Logging 1. Overview In this tutorial, we’ll look into a couple of basic options the Spring Framework offers for performance monitoring. 2. PerformanceMonitorInterceptor A simple solution to get basic monitoring functionality for the execution time of our methods, we can make use of the PerformanceMonitorInterceptor class out of… Continue Reading spring-performance-logging
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Show Hibernate/JPA SQL Statements from Spring Boot 1. Overview Spring JDBC and JPA provide abstractions over native JDBC APIs allowing developers to do away with native SQL queries. However, often we need to see those auto-generated SQL queries and the order in which they were executed for debugging purposes. In… Continue Reading sql-logging-spring-boot
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Spring Boot Embedded Tomcat Logs 1. Introduction Spring Boot comes with an embedded Tomcat server, which is super-handy. However, we can’t see Tomcat’s logs by default. In this tutorial, we’ll learn how to configure Spring Boot to show Tomcat’s internal and access logs via a toy application. 2. Sample Application… Continue Reading spring-boot-embedded-tomcat-logs
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Logging Spring WebClient Calls 1. Overview In this tutorial, we are going to show how to customize Spring’s WebClient – a reactive HTTP client – to log requests and responses. 2. WebClient WebClient is a reactive and non-blocking interface for HTTP requests, based on Spring WebFlux. It has a functional,… Continue Reading spring-log-webclient-calls
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@Timed Annotation Using Metrics and AspectJ 1. Introduction Monitoring is very helpful for finding bugs and optimizing performance. We could manually instrument our code to add timers and logging, but this would lead to a lot of distracting boilerplate. On the other hand, we can use a monitoring framework, driven… Continue Reading timed-metrics-aspectj
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Logging HTTP Requests with Spring Boot Actuator HTTP Tracing 1. Introduction When we work with microservices or web services in general, it’s quite useful to know how our users interact with our services. This can be achieved by tracing all the requests that hit our services and collect this information… Continue Reading spring-boot-actuator-http
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Idiomatic Logging in Kotlin 1. Introduction In this tutorial, we’ll take a look at a few logging idioms that fit typical Kotlin programming styles. 2. Logging Idioms Logging is a ubiquitous need in programming. While apparently a simple idea (just print stuff!), there are many ways to do it. In… Continue Reading kotlin-logging
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Get Log Output in JSON 1. Introduction Most Java logging libraries today offer different layout options for formatting logs – to accurately fit the needs of each project. In this quick article, we want to format and output our log entries as JSON. We’ll see how to do this for… Continue Reading java-log-json-output
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