Dan Lipofsky created SLF4J-425: ---------------------------------- Summary: stack trace is logged despite exception matching a parameter in format string Key: SLF4J-425 URL: https://jira.qos.ch/browse/SLF4J-425 Project: SLF4J Issue Type: Bug Components: Core API Affects Versions: 1.7.25 Environment: Slf4j 1.7.25 Logback 1.2.3 SpringBoot 1.5.9 Java 1.8.0_121 Reporter: Dan Lipofsky Assignee: SLF4J developers list Priority: Minor I want to pass an exception into a parameterized log call and have it *not* log the stacktrace. According to the [FAQ|https://www.slf4j.org/faq.html#paramException] "If the exception is not the last argument, it will be treated as a plain object and its stack trace will NOT be printed." which is exactly what I want.  {{But when I try}} {{LOG.info("foo \{} bar \{}", "xxx", new RuntimeException("ZZZ"));}} {{I get}} {{2018-01-02 15:52:40.637 INFO [main] com.foo.Bar foo xxx bar \{}}} {{java.lang.RuntimeException: ZZZ}} {{    at com.foo.Bar.<init>(Bar.java:37)}} {{    ...}} so it does not substitute that last parameter and it creates an unwanted stacktrace. I can work around this by manually calling toString() but this * defeats the efficiencies of using a parameterized call * probably makes my static analysis tool warn that the exception has not been logged -- This message was sent by Atlassian JIRA (v7.3.1#73012)