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https://issues.apache.org/jira/browse/MCOMPILER-279?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15533781#comment-15533781
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Robert Scholte commented on MCOMPILER-279:
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Registered as https://github.com/codehaus-plexus/plexus-compiler/issues/23. Up
until now everything was passed as a Map, which is causing the issue.
> Passing multiple --add-exports args to the compilerArgs is not supported
> ------------------------------------------------------------------------
>
> Key: MCOMPILER-279
> URL: https://issues.apache.org/jira/browse/MCOMPILER-279
> Project: Maven Compiler Plugin
> Issue Type: Bug
> Affects Versions: 3.5.1
> Reporter: Michael Musgrove
> Attachments: jdk9-test.tar
>
>
> This plugin collapses multiple compiler args with the same name into a single
> one.
> An example of where this is an issue is when exporting extra packages from a
> Java SE 9 module:
> Suppose we want to export two packages (package1 and package2) from a module
> called FROM-MOD to the OTHER-MOD module. The syntax for this is:
> {code}
> javac ... --add-exports FROM-MOD/package1=OTHER-MOD --add-exports
> FROM-MOD/package2=OTHER-MOD
> {code}
> and the plugin configuration for this is:
> {code:xml}
> <configuration>
> ...
> <compilerArgs>
> <arg>--add-exports</arg>
> <arg>FROM-MOD/package1=OTHER-MOD</arg>
> <arg>--add-exports</arg>
> <arg>FROM-MOD/package2=OTHER-MOD></arg>
> <compilerArgs>
> </configuration>
> {code}
> which produces:
> {code}
> javac ... --add-exports FROM-MOD/package1=OTHER-MOD
> FROM-MOD/package2=OTHER-MOD
> {code}
> Notice the missing --add-exports for the second export so the compiler
> complains with the error:
> bq. Caused by: java.lang.IllegalArgumentException: invalid flag:
> java.corba/com.sun.corba.se.spi.ior=ALL-UNNAMED
> A concrete but basic example maven project is attached.
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