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From "Ralph Goers (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (LOG4J2-1013) Log4j2 Main Arguments Lookup by name doesn't work
Date Mon, 10 Aug 2015 06:13:45 GMT

    [ https://issues.apache.org/jira/browse/LOG4J2-1013?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14679626#comment-14679626
] 

Ralph Goers edited comment on LOG4J2-1013 at 8/10/15 6:13 AM:
--------------------------------------------------------------

As far as StrSubstitutor is concerned all variables are of the form $\{key:\-defaultValue}.
 StrSubstituor uses Lookups to resolve the key into a value. The Interpolator is a "special"
Lookup that subdivides the key into "LookupName:key". The default value portion should be
left alone and should only be used when the key cannot be resolved. The problem I believe
you are having is that StrSubstitutor is seeing the ":-" and is removing that along with the
"-file" to use as the default value. Changing the value to ":" is just going to make things
worse.

I don't know that we document that you can have default values for lookups, but the syntax
would be $\{lookup:key:\-defaultValue}.  As you noted we could change the default value delimiter
to something else that we know wouldn't cause a problem - if you know what that is. Perhaps
";-" would work better since that would distinguish it from the Lookup key.


was (Author: ralph.goers@dslextreme.com):
As far as StrSubstitutor is concerned all variables are of the form ${key:-defaultValue}.
 StrSubstituor uses Lookups to resolve the key into a value. The Interpolator is a "special"
Lookup that subdivides the key into "LookupName:key". The default value portion should be
left alone and should only be used when the key cannot be resolved. The problem I believe
you are having is that StrSubstitutor is seeing the ":-" and is removing that along with the
"-file" to use as the default value. Changing the value to ":" is just going to make things
worse.

I don't know that we document that you can have default values for lookups, but the syntax
would be $\{lookup:key:\-defaultValue}.  As you noted we could change the default value delimiter
to something else that we know wouldn't cause a problem - if you know what that is. Perhaps
";-" would work better since that would distinguish it from the Lookup key.

> Log4j2 Main Arguments Lookup by name doesn't work
> -------------------------------------------------
>
>                 Key: LOG4J2-1013
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-1013
>             Project: Log4j 2
>          Issue Type: Bug
>          Components: API, Core, Lookups
>    Affects Versions: 2.2
>         Environment: Windows 7 x64 Ultimate and Java 8U31 x64. Project created using
Eclipse.
>            Reporter: Ioan Mihaila
>            Priority: Critical
>
> Accessing Main Arguments by using index based look up works : ${main:0}
> Accessing Main Arguments by using name based look up doesn't work : ${main:--file}
> When trying to access by name it doesn't retrieve the argument but retrieves "-file".



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