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https://issues.apache.org/jira/browse/MCOMPILER-533?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17799540#comment-17799540
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Jorge Solórzano commented on MCOMPILER-533:
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There are some scenarios where it might be useful to have this behavior, some
projects set source/target to compile to Java 8 and use a profile to compile to
Java 9 using the -release option.
The error is not lost because Maven gives priority to the -release option, and
that should be correct, it does not set the source/target so no error occurs.
Yet, I think that a warning should be displayed mentioning that --target is
ignored when used together with --release if both are set.
> 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
> Priority: Major
>
> 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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