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javaintellij-ideaoperator-overloadingsympyintellij-plugin

Installing SymJava/Java Operator Overloading support in Intellij IDEA?

For my project I want to use SymJava. The README there requires me to install the Java Operator Overloading support. Since I am using Intellij IDEA (Version 2019.1.2), I tried to follow the directive given. However, I am confused by the second step:

  1. Add javac8-oo-plugin.jar as compile or processor library.

What is meant by "compile or processor library"?

Also a note: I did the first step before. This made Intellij IDEA ask me to restart the IDE. When I did that, a fatal error initializing the plugin occured when re-opening the IDE and my project:

enter image description here

What may be my misunderstanding in the process? I am using Java 15.0.1 here. Is that the problem perhaps, since it says something about using Java 8? I assumed it should work with later versions nevertheless.

Since I need to use this newer Java version, is it impossible for me to use SymJava then? And if so, can you recommend an alternative library similar to this (which is a Java counterpart to SymPy)?

Solution
    1. Add javac8-oo-plugin.jar as compile or processor library.

    Means that you need to add this jar to the module classpath by adding it as a module library. This will add it to compile classpath and to processor path if you have the Settings (Preferences on macOS) | Build, Execution, Deployment | Compiler | Annotation Processors | | Obtain processors from project classpath option enabled.

    a fatal error initializing the plugin occured when re-opening the IDE and my project:

    Double check the plugin zip archive file is not corrupted and is compatible with this IDE version. Btw I was unable to download it from github from the README instrucitons. You may need to better contact the repository author about this.