Arend v. Reinersdorff created MCOMPILER-533:
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Summary: Output an error when --release option is used together
with --source or --target
Key: MCOMPILER-533
URL: https://issues.apache.org/jira/browse/MCOMPILER-533
Project: Maven Compiler Plugin
Issue Type: Improvement
Affects Versions: 3.11.0
Reporter: Arend v. Reinersdorff
javac outputs an error when the --release option is used together with the
--source or --target option. See
[https://docs.oracle.com/en/java/javase/17/docs/specs/man/javac.html#option-release]
For example:
{{javac --release 17 --target 17 ...}}
Will fail with this error:
{{error: option --target cannot be used together with --release}}
This is nice because it informs the user of misconfiguration and enforces the
use of only --release or only --source/--target.
Unfortunately, the error is lost when compiling with Maven. Maven uses the
release option and silently ignores source and target. Users don't notice when
they unnecessarily set both. See for example
[https://github.com/spring-projects/spring-boot/pull/34761]
For example:
{{<plugin>}}
{{ <groupId>org.apache.maven.plugins</groupId>}}
{{ <artifactId>maven-compiler-plugin</artifactId>}}
{{ <version>3.11.0</version>}}
{{ <configuration>}}
{{ <release>17</release>}}
{{ <source>17</source>}}
{{ <target>17</target>}}
{{ </configuration>}}
{{</plugin>}}
Compiles using the release option without any error or warning.
It would be nice to restore the error from javac in Maven, or output a similar
one.
The problem I see is that Maven uses default values for source and target. When
the user sets only the release option, no error or warning should be caused
because of the default values for source and target.
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