[logback-dev] [JIRA] Commented: (LBCLASSIC-107) thrown from toString exception swallowed

[Thorbjoern Ravn Andersen (JIRA)]

    [ http://jira.qos.ch/browse/LBCLASSIC-107?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=11088#action_11088 ] 

Thorbjoern Ravn Andersen commented on LBCLASSIC-107:
----------------------------------------------------

I did some work on this with the logger agent in slf4j where any object is a candidate for a toString call (which may have devastating effects).

I don't think the exception should propagate to the calling program.  Changing loglevels should not influence program execution as such.

> 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)

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