[jira] [Created] (MCOMPILER-279) Passing multiple --add-exports args to the compilerArg is not supported

["Michael Musgrove (JIRA)" <ji...@apache.org>]

Michael Musgrove created MCOMPILER-279:
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             Summary: Passing multiple --add-exports args to the compilerArg 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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