Hi,
Initially in version 0.6.1 this was implemented as prepending of empty
string ( see
https://github.com/jacoco/jacoco/commit/ca863838a09a935572c3291da708870f6b9bc3c3#diff-1e1f9f25011241fca234b2856ec18b8eR175
associated with https://github.com/jacoco/jacoco/issues/44 ) to cover
scenario when execution is skipped with following configuration
<properties>
<-- no argLine here -->
</properties>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<configuration>
<argLine>-foobar ${argLine}</argLine>
</configuration>
</plugin>
According to https://github.com/jacoco/jacoco/pull/192 there was regression
in 0.6.4 regarding this.
But unfortunately behavior wasn't fully restored in 0.6.5 (
https://github.com/jacoco/jacoco/commit/c4aef33c74400419852d76b6579fbcbf58b4666e
) , i.e. it started to set empty instead of prepending empty string.
All in all - thank you for finding this bug! I created ticket
https://github.com/jacoco/jacoco/issues/486
For now there are seems to be multiple ways to workaround this, like the
one that you mention. Another one - is to use property dedicated for JaCoCo
using "propertyName" parameter (
http://www.jacoco.org/jacoco/trunk/doc/prepare-agent-mojo.html#propertyName
).
Hope this helps.
Regards,
Evgeny
On Saturday, January 28, 2017 at 4:54:09 PM UTC+1, Roberto Andrioli wrote:
>
> Hey Guys,
>
> I have another question about JaCoCo.
>
> Why is JaCoCo plugin setting argLine to empty when the plugin execution is
> skipped? Why simply does nothing? i.e., do not change argLine.
>
> I come with this question after setup a simple Maven project. In this
> project I have a Java agent configured in the argLine directly in
> properties section:
>
> ```
> <properties>
> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
> <argLine>-javaagent:lib/my-custom-agent.jar
> -Doutput.file=target/output.bin</argLine>
> </properties>
> ```
>
> JaCoCo plugin prepend its own configuration in the argLine and Surefire
> runs everything perfectly. But when JaCoCo plugin is skipped, the argLine
> is set to empty and my custom agent do not run.
>
> I know, I can easily fix this issue by configuring the Surefire plugin.
> But there is some technical reason for this behavior?
>
> Thanks in advance
>
> Roberto
>
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