[logback-dev] [JIRA] Commented: (LBCORE-179) conversion word %ex length handling is off by one

[Ceki Gulcu (JIRA)]

    [ http://jira.qos.ch/browse/LBCORE-179?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12101#action_12101 ] 

Ceki Gulcu commented on LBCORE-179:
-----------------------------------

See also https://github.com/ceki/logback/pull/25


> conversion word %ex length handling is off by one
> -------------------------------------------------
>
>                 Key: LBCORE-179
>                 URL: http://jira.qos.ch/browse/LBCORE-179
>             Project: logback-core
>          Issue Type: Bug
>          Components: Pattern
>    Affects Versions: 0.9.26
>            Reporter: Michael Osipov
>            Assignee: Ceki Gulcu
>
> The %ex and %xEx define a stack trace length. The integer spec is somewhat faulty and misleading. First of all this is a stack trace depth imho and not length. Anyway, I was poking around with the SMTPAppender and wanted to include the sole exception message into the subject. The outcome was:
> 1. The docs do not define a valid interval for the integer value. You can only deduce from logic.
> 2. I defined %ex{short} and it included 2 lines of the stack trace.
> 3. I defined %ex{2} and it included 3 lines of the stack trace.
> 4. I defined %ex{0} and it included 1 line of the stack trace.
> 5. Defining any negative number omits the stack trace. But it does not make sense at all to have a negative stack trace depth.
> I checked also the source of the [https://github.com/ceki/logback/blob/master/logback-classic/src/main/java/ch/qos/logback/classic/pattern/ThrowableProxyConverter.java converter], the lines 54 and 58 cause the problem. 

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