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Tag Archives: Logging

Keeping Your Logs From Becoming an Unreadable Mess

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When you run into a strange, seemingly unsolvable bug, improving your logging can be the best step you can take. Great logging is the easiest way to detect and fix entire classes of bugs. When you log enough information, you can see how your data changes during a request. You can track the calls you make to other services, and ...

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Java 8 Deferred Invocation with Java Util Logging

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In the blog post Better Performing Non-Logging Logger Calls in Log4j2, I looked at approaches one can use in Log4j 2 to reduce or avoid invocation of methods in log statements that, based on the specified log level, are not actually logged at all. As part of this discussion, I covered Log4j 2‘s support for Java 8-based deferred execution using ...

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The 5 Java logging rules

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Logging is a critical factor that should be always kept into account during the software development. When something bad happens in production, the log files are usually the starting point of our fault analysis. And, often, they are the only information in our hands to understand what is happened and which is the root cause of the problem. It is ...

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Tutorial: logging during tests

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Logging is a popular solution to show what the software is doing while it is running. But what happens to the logging when we are unit testing our application with jUnit/TestNG ? During the automated tests execution, we are usually not interested to see the logging messages because our main interest is the test results. It would be nice to ...

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Simplify your logging with tinylog 1.0

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With a size of only 75 KB, tinylog is a lightweight alternative to the widespread classical logging frameworks Log4j and Logback. The final version 1.0 has been just released at the end of March, after three years of development. In several design issues, tinylog takes a deliberately different approach from classical logging frameworks in Java. This article will show the ...

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OptaPlanner – How fast is logging?

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What’s the cost of trace/debug logging in production? What’s the performance cost of logging to a file? In these benchmarks, I compare the performance impact of logging levels (error, warn, info, debug, trace) and logging appenders (console appender, file appender) on several realistic OptaPlanner use cases. Benchmark methodology Logging implementation: SFL4J 1.7.2 with Logback 1.0.9 (Logback is the spiritual successor ...

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Using Java 8 to Prevent Excessively Wide Logs

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Some logs are there to be consumed by machines and kept forever. Other logs are there just to debug and to be consumed by humans. In the latter case, you often want to make sure that you don’t produce too much logs, especially not too wide logs, as many editors and other tools have problems once line lenghts exceed a ...

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Writing your own logging service?

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Application logging is one those things like favorite Editors war: everyone has their own opinions and there are endless of implemenations and flavors out there. Now a days, you likely would want to use something already available such as Log4j or Logback. Even JDK has a built in “java.util.logging” implementation. To avoid couple to a direct logger, many projects would ...

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