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https://issues.apache.org/jira/browse/MNG-7194?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17853537#comment-17853537
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Piotr Zygielo commented on MNG-7194:
------------------------------------
Just wonder if this could be related to my unmet expectation I have with
surefire and {{{}surefire.forkNumber{}}}.
Given
[https://maven.apache.org/surefire/maven-surefire-plugin/test-mojo.html#forkCount]
{quote}The system properties and the argLine of the forked processes may
contain the place holder string \{${surefire.forkNumber}}, which is replaced
with a fixed number for each of the parallel forks
{quote}
When I configure {{m-surefire-p}} with
{code:xml}
<systemPropertyVariables>
<p1>${surefire.forkNumber}</p1>
</systemPropertyVariables>
{code}
Then {{p1}} system property (available in test) is set to empty string (it's
not set during interpolation of parameters for plugin and
{{SurefireHelper.replaceThreadNumberPlaceholders}} finds nothing to work with).
(While {color:#de350b}I expect(ed){color} the value {{N}} there.)
But when I use
{code:xml}
<systemPropertyVariables>
<p1>_${surefire.forkNumber}_</p1>
</systemPropertyVariables>
{code}
(where {{_}} can be anything just to not leave {{{}${}}}-property reference
alone)
Then {{p1}} system property is set to {{_N_}} as expected, as it's passed to SF
as unchanged {{_${surefire.forkNumber}_}} and
{{SurefireHelper.replaceThreadNumberPlaceholders}} is happy with that.
If those cases are linked - then perhaps if
{quote}It should be just pre?
{quote}
is implemented, (would it cause {{__}} to be passed for my {{p1}} to SF?) it
would probably need some changes in SF in such case.
(Or could be handled in SF in first place separately.)
I think.
> PluginParameterExpressionEvaluator incorrectly interpolates unknown
> subexpression
> ---------------------------------------------------------------------------------
>
> Key: MNG-7194
> URL: https://issues.apache.org/jira/browse/MNG-7194
> Project: Maven
> Issue Type: Bug
> Components: Inheritance and Interpolation
> Reporter: Robert Scholte
> Priority: Minor
>
> The PluginParameterExpressionEvaluator evaluate(String,Class)-method ends
> like this:
> {code:java}
> if ( value instanceof String )
> {
> // TODO: without #, this could just be an evaluate call...
> String val = (String) value;
> int exprStartDelimiter = val.indexOf( "${" );
> if ( exprStartDelimiter >= 0 )
> {
> if ( exprStartDelimiter > 0 )
> {
> value = val.substring( 0, exprStartDelimiter ) +
> evaluate( val.substring( exprStartDelimiter ) );
> }
> else
> {
> value = evaluate( val.substring( exprStartDelimiter ) );
> }
> }
> }
> {code}
> Assume that pre${unknown} needs to be evaluated and {{unknown}} does not
> exist, the result well be "{{prenull}}"
> Just ${unknown} evaluates to null, but because there's no String concat it
> will be a real null.
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