I figured this out myself. Here is the setting I use in the topmost
pom.xml of my project.
<build>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<encoding>UTF-8</encoding>
</configuration>
</plugin>
</plugins>
</build>
However, I have one question: Is there any other/better way to do it?
Using mvn projecthelp:effective-pom, I found out that the setting
automatically applies to child modules which is very nice. This seems to
be the case even when Maven is called in a directory of such a child
module, as long as it is correctly linked via <parent>. I assume this
stuff happens when Maven says "Scanning for projects...", someone on
this list called it "global source tree", IIRC.
To improve understanding of how Maven works, I suggest this fact be
mentioned in the multi-project guideline.
Christoph
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