我刚刚弄清楚了.我还需要调整Maven-compiler-plugin中的版本.我正在使用3.8.0版.我需要更改此值:

I just figured it out. I also needed to adjust the version in the maven-compiler-plugin. I'm using version 3.8.0. I needed to change this value:

<release>10</release>

在这里找到它:

<build>
  <plugins>
    <plugin>
      <artifactId>maven-compiler-plugin</artifactId>
        <version>3.8.0</version>
        <configuration>
            <release>10</release> <!-- This was the problem. -->
        </configuration>
        ...