Bug: package org.simplejavamail.internal.modules causes split package problem in Java9+

[quimodotcom]

quimo@Evans-Air sendemailaction % mvn clean package
[INFO] Scanning for projects...
[INFO]
[INFO] -------------------< com.stream-pi:sendemailaction >--------------------
[INFO] Building sendemailaction 1.0.0
[INFO] --------------------------------[ jar ]---------------------------------
[INFO]
[INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ sendemailaction ---
[INFO] Deleting /Users/quimo/Documents/GitHub/essential-actions/sendemailaction/target
[INFO]
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ sendemailaction ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] skip non existing resourceDirectory /Users/quimo/Documents/GitHub/essential-actions/sendemailaction/src/main/resources
[INFO]
[INFO] --- maven-compiler-plugin:3.8.1:compile (default-compile) @ sendemailaction ---
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 2 source files to /Users/quimo/Documents/GitHub/essential-actions/sendemailaction/target/classes
[INFO] -------------------------------------------------------------
[ERROR] COMPILATION ERROR :
[INFO] -------------------------------------------------------------
[ERROR] the unnamed module reads package org.simplejavamail.internal.modules from both org.simplejavamail.core and org.simplejavamail
[ERROR] module org.simplejavamail.core reads package org.simplejavamail.internal.modules from both org.simplejavamail and org.simplejavamail.core
[ERROR] module org.simplejavamail reads package org.simplejavamail.internal.modules from both org.simplejavamail.core and org.simplejavamail
[ERROR] /Users/quimo/Documents/GitHub/essential-actions/sendemailaction/src/main/java/module-info.java:[1,1] module com.quimodotcom.sendemailaction reads package org.simplejavamail.internal.modules from both org.simplejavamail and org.simplejavamail.core
[INFO] 4 errors
[INFO] -------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 5.316 s
[INFO] Finished at: 2022-01-20T11:14:49Z
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.8.1:compile (default-compile) on project sendemailaction: Compilation failure: Compilation failure:
[ERROR] the unnamed module reads package org.simplejavamail.internal.modules from both org.simplejavamail.core and org.simplejavamail
[ERROR] module org.simplejavamail.core reads package org.simplejavamail.internal.modules from both org.simplejavamail and org.simplejavamail.core
[ERROR] module org.simplejavamail reads package org.simplejavamail.internal.modules from both org.simplejavamail.core and org.simplejavamail
[ERROR] /Users/quimo/Documents/GitHub/essential-actions/sendemailaction/src/main/java/module-info.java:[1,1] module com.quimodotcom.sendemailaction reads package org.simplejavamail.internal.modules from both org.simplejavamail and org.simplejavamail.core
[ERROR] -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException

[bbottema]

What is the situation, context and how do I fix this?

[quimodotcom]

What is the situation, context and how do I fix this?

situation is said in the code and the title, context is in the code. idk how to fix it that's why I'm asking you.

[bbottema]

You're not giving me much to go on here, friend. What version of maven and Simple Java Mail are you on. What dependencies do you have if you do mvn dependency:tree what JDK are you using, what Simple Java Mail modules have you included etc., Windows, Linux.

I suspect you are using JDK 11 or above, but I don't know much about modules. There have been issues about this before, which are still open, but frankly I don't get many bug reports about this so I'm not sure.

[quimodotcom]

apache version: Apache Maven 3.8.4 (9b656c72d54e5bacbed989b64718c159fe39b537)
Maven home: /usr/local/Cellar/maven/3.8.4/libexec
Java version: 17, vendor: Oracle Corporation, runtime: /Users/quimo/jdk-17.jdk/Contents/Home
Default locale: en_GB, platform encoding: UTF-8
OS name: "mac os x", version: "12.1", arch: "x86_64", family: "Mac"

SimpleJavaMail: 7.0.0

man dependency:tree: quimo@Evans-MacBook-Air sendemailaction % mvn dependency:tree
[INFO] Scanning for projects...
[INFO]
[INFO] -------------------< com.stream-pi:sendemailaction >--------------------
[INFO] Building sendemailaction 1.0.0
[INFO] --------------------------------[ jar ]---------------------------------
[INFO]
[INFO] --- maven-dependency-plugin:2.8:tree (default-cli) @ sendemailaction ---
[WARNING] The artifact xml-apis:xml-apis:jar:2.0.2 has been relocated to xml-apis:xml-apis:jar:1.0.b2
[INFO] com.stream-pi:sendemailaction:jar:1.0.0
[INFO] +- com.stream-pi:action-api:jar:1.0.0-SNAPSHOT:compile
[INFO] | +- com.stream-pi:util:jar:1.0.0-SNAPSHOT:compile
[INFO] | | +- org.openjfx:javafx-controls:jar:17.0.0.1:compile
[INFO] | | | +- org.openjfx:javafx-controls:jar:mac:17.0.0.1:compile
[INFO] | | | - org.openjfx:javafx-graphics:jar:17.0.0.1:compile
[INFO] | | | +- org.openjfx:javafx-graphics:jar:mac:17.0.0.1:compile
[INFO] | | | - org.openjfx:javafx-base:jar:17.0.0.1:compile
[INFO] | | | - org.openjfx:javafx-base:jar:mac:17.0.0.1:compile
[INFO] | | +- org.kordamp.ikonli:ikonli-javafx:jar:12.2.0:compile
[INFO] | | | - org.kordamp.ikonli:ikonli-core:jar:12.2.0:compile
[INFO] | | +- org.kordamp.ikonli:ikonli-fontawesome5-pack:jar:12.2.0:compile
[INFO] | | - com.google.code.gson:gson:jar:2.8.8:compile
[INFO] | - eu.hansolo:Medusa:jar:11.7:compile
[INFO] - org.simplejavamail:simple-java-mail:jar:7.0.0:compile
[INFO] +- org.simplejavamail:core-module:jar:7.0.0:compile
[INFO] | +- com.sun.mail:jakarta.mail:jar:2.0.1:compile
[INFO] | +- com.sun.activation:jakarta.activation:jar:2.0.1:compile
[INFO] | +- jakarta.xml.bind:jakarta.xml.bind-api:jar:2.3.2:compile
[INFO] | | - jakarta.activation:jakarta.activation-api:jar:1.2.1:compile
[INFO] | +- jakarta.annotation:jakarta.annotation-api:jar:1.3.5:compile
[INFO] | +- com.sanctionco.jmail:jmail:jar:1.2.1:compile
[INFO] | - com.github.tony19:named-regexp:jar:0.2.6:compile
[INFO] +- com.github.bbottema:jetbrains-runtime-annotations:jar:1.0.1:compile
[INFO] - org.slf4j:slf4j-api:jar:1.7.32:compile
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 5.527 s
[INFO] Finished at: 2022-01-20T15:23:34Z
[INFO] ------------------------------------------------------------------------

[bbottema]

So I just did a mvn clean package with SJM 7.0.0 and Oracle JDK 17 and I'm not able to reproduce this. Can you share your code with me?

[quimodotcom]

sendemailaction.zip

[bbottema]

I finally get it, it's the split package problem caused by the same package occurring in multiple modules.