IntelliJ IDEA Ultimate 2018.3 认为我的 Java 9 项目是 Kotlin 项目

Question

I have an IntelliJ project composing several subprojects which are all Java 9 modules. I use Maven as a build system. My project has no "Facets". My run configuration looks like this:

My project settings look like this:

I can build everything with Maven just fine. However, when I try to compile with IntelliJ, it somehow thinks that my project is a Kotlin project and can't compile it:

Error:Kotlin: The Kotlin standard library is not found in the module graph. Please ensure you have the 'requires kotlin.stdlib' clause in your module definition

Has anyone any idea how to fix this? I already tried deleting the run configuration and recreated it. This fixes the problem for some time, but then it reappears randomly.

Answer 1

Even in 2019.1.3 that error is there .

A solution that always works for me is :

Build menu => Rebuild Project

Tested with JDK 12.0.1

---

That should be fixed though by IntelliJ team as soon as possible as more and more Java projects are passing to JDK 11 ++

Answer 2

I had the same problem. I worked in a pure Java project managed with Maven. Till some days ago I applied the solution "rebuild" the project, but sometimes the error came back again.

After more investigation, I found that after disable "Enable migration detection" menu, the problem disappears.

I hope this helps.

Answer 3

尝试使用 Ctrl+Shift+F9 重建模块或右键单击模块并在菜单中选择“重建”。

Answer 4

Meanwhile, this can be fixed using the kotlin-stdlib.jar available in Kotlin JavaRuntime:

module kotlin.test {
    requires kotlin.stdlib;
}

where kotlin.test should be replaced with your module name.

Just in case the details matter, I am using

IntelliJ IDEA 2018.3 (Community Edition) Build #IC-183.4284.148, built on November 21, 2018

and the Kotlin JavaRunTime mentioned above has sources from the path Contents/plugins/Kotlin/kotlinc/lib within the IntelliJ .app which includes kotlin-stdlib.jar as one of them.

Answer 5

我遇到了同样的问题，我删除了文件并重新开始，之后它工作正常

Answer 6

我通过禁用 Kotlin 插件修复了这个错误，因为我没有使用它并且问题解决了

Answer 7

Update your module-info.java file

requires javafx.fxml;
requires javafx.controls;
requires javafx.graphics;
requires javafx.web;

opens sample;

opens sample.controller;

It opens the package (eg. sample) which contains your Launcher file and opens package conatinsyoyr controllers and its corresponding fxml files (eg. sample.controller)

Answer 8

I had the same issue. Here is what worked:

1. On IntellijIDEA go to 'Tools' menu at the top of the application: .
2. Then scroll down to 'Kotlin'.
3. Click 'Configure Kotlin in Project'.