thrown from toString exception swallowed ---------------------------------------- Key: LBCLASSIC-107 URL: http://jira.qos.ch/browse/LBCLASSIC-107 Project: logback-classic Issue Type: Bug Affects Versions: 0.9.15 Environment: java version "1.6.0_12" Java(TM) SE Runtime Environment (build 1.6.0_12-b04) Java HotSpot(TM) Client VM (build 11.2-b01, mixed mode, sharing) slf4j-api:1.5.6 Reporter: Anton Lebedevich Assignee: Logback dev list package loggerbug; import org.slf4j.Logger; import org.slf4j.LoggerFactory; public class Loggerbug { private static final Logger logger = LoggerFactory.getLogger(Loggerbug.class); static class ThrowsToString { @Override public String toString() { throw new RuntimeException("from toString"); } } public static void main(String[] args) { ThrowsToString probe = new ThrowsToString(); logger.info("probe is {}", probe); System.out.println("no exception"); } } prints "no exception" with logback-classic, but with slf4j-simple output is: Exception in thread "main" java.lang.RuntimeException: from toString at loggerbug.Loggerbug$ThrowsToString.toString(Loggerbug.java:13) at java.lang.String.valueOf(String.java:2827) at java.lang.StringBuffer.append(StringBuffer.java:219) at org.slf4j.helpers.MessageFormatter.deeplyAppendParameter(MessageFormatter.java:237) at org.slf4j.helpers.MessageFormatter.arrayFormat(MessageFormatter.java:196) at org.slf4j.helpers.MessageFormatter.format(MessageFormatter.java:138) at org.slf4j.impl.SimpleLogger.formatAndLog(SimpleLogger.java:222) at org.slf4j.impl.SimpleLogger.info(SimpleLogger.java:258) at loggerbug.Loggerbug.main(Loggerbug.java:20) -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: http://jira.qos.ch/secure/Administrators.jspa - For more information on JIRA, see: http://www.atlassian.com/software/jira