对我来说，插件是与概要文件相关的。 我必须通过Maven(右侧栏菜单)启用相关的配置文件，配置文件并让依赖项下载。

这些方法对我来说都没用。在经历了痛苦的几个小时后，我发现这个问题是由我导入项目的方式引起的。

上下文:导入带有Web和Kafka依赖项的新生成的Spring Initializr项目。

问题:插件依赖“未找到”，IntelliJ无法编译应用程序，即使mvn清洁编译在控制台上运行良好。

坏的方法:使用“New > Project from Existing Sources…”选项导入它。

好的方法是:使用“Open…”选项导入它。

从坏到好的解决方案:删除项目，从版本控制中删除并重新克隆repo，以确保所有gitignored IntelliJ文件都被删除，并使用“Open…”选项将其导入IntelliJ。

我的情况:

maven-javadoc-plugin with version 3.2.0 is displayed red in IntelliJ. Plugin is present in my local maven repo. Re-imported maven million times. Ran mvn clean install from the command line N times. All my maven settings in IntelliJ are correct. Tried to switch between Bundled and non-bundled Maven. Tried do delete the whole maven repo and to delete only the plugin from it. Nothing of the above worked. The only thing that almost always helps with modern IntelliJ IDEA versions is "Invalidate caches / Restart". It helped this time as well. maven-javadoc-plugin is not red anymore, and I can click on it and to to the source pom file of the plugin.

其他的解决方法对我都不起作用。

我的解决方案:

Maven设置->存储库->在列表中选择“本地存储库”，单击“更新”

效果好极了!

从maven工具窗口运行Force重新导入。如果不工作，Invalidate你的缓存(文件> Invalidate缓存)并重新启动。等待IDEA重新索引项目。

6月/ 2021:

不删除，不重新导入。

我所做的就是:

C:\Users\dell\.m2\repository\org\apache\maven\plugins

然后双击每个插件文件夹，并查看下载的版本。

然后我回到pom文件，根据下载的版本，我在<version>....中仔细修改了那些版本> < /版本标签。然后刷新。

这样，所有的红色标记都消失了，甚至那些黄色标记也消失了。

所有的清洁。

这是我完整的pom文件，以备进一步通知。该项目是JavaFx+Maven与阴影:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>main.java.sample</groupId>
    <artifactId>ThreeColumnTable</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>11</maven.compiler.source>
        <maven.compiler.target>11</maven.compiler.target>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.openjfx</groupId>
            <artifactId>javafx-controls</artifactId>
            <version>15.0.1</version>
        </dependency>
        <dependency>
            <groupId>org.openjfx</groupId>
            <artifactId>javafx-fxml</artifactId>
            <version>15.0.1</version>
        </dependency>
        <dependency>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-install-plugin</artifactId>
            <version>2.4</version>
            <type>maven-plugin</type>
        </dependency>

        <dependency>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-deploy-plugin</artifactId>
            <version>2.7</version>
            <type>maven-plugin</type>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.8.0</version>
                <configuration>
                    <source>11</source>
                    <target>11</target>
                    <release>11</release>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-resources-plugin</artifactId>
                <version>2.6</version>
                <executions>
                    <execution>
                        <phase>test</phase>
                        <goals>
                            <goal>resources</goal>
                            <goal>testResources</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-project-info-reports-plugin</artifactId>
                <version>3.1.2</version>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-clean-plugin</artifactId>
                <version>3.1.0</version>
                <configuration>
                    <filesets>
                        <fileset>
                            <directory>src/main/generated-groovy-stubs</directory>
                        </fileset>
                    </filesets>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-jar-plugin</artifactId>
                <version>2.4</version>
                <configuration>
                    <archive>
                        <manifest>
                            <mainClass>org.example.App</mainClass>
                            <manifestFile>src/main/resources/META-INF/MANIFEST.MF</manifestFile>
                        </manifest>
                    </archive>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.openjfx</groupId>
                <artifactId>javafx-maven-plugin</artifactId>
                <version>0.0.1</version>
                <configuration>
                    <mainClass>org.example.App</mainClass>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-shade-plugin</artifactId>
                <version>3.2.4</version>
                <executions>
                    <execution>
                        <goals>
                            <goal>shade</goal>
                        </goals>
                        <configuration>
                            <shadedArtifactAttached>true</shadedArtifactAttached>
                            <shadedClassifierName>project-classifier</shadedClassifierName>
                            <transformers>
                                <transformer implementation=
                                                     "org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                                    <mainClass>org.example.Main</mainClass>
                                </transformer>
                            </transformers>

                        </configuration>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
</project>