java找不到工件com。sun:tools:jar:0

Question

我试图通过执行mvn checkstyle:checkstyle来使用checkstyle和findbugs，但是出现了这个错误 This error

[ERROR] Failed to execute goal on project my-project: Could not resolve dependencies for project default:my-project:jar:1.1: Could not find artifact com.sun:tools:jar:0 at specified path C:\Program Files\Java\jdk-11.0.2/../lib/tools.jar -> [Help 1]

我没有工具。jar到我的JDK中（我有JDK-11.0.2）

我从2小时就开始了，请帮助：/

Answer 1

tools.jar已从Java 9中删除+

你在JDK 11上。没有找到tools.jar

JEP 220: Modular Run-Time Images从lib文件夹中删除了tools.jar和rt.jar，从Java 9开始

Removed: rt.jar and tools.jar

The class and resource files previously stored in lib/rt.jar, lib/tools.jar, lib/dt.jar, and various other internal JAR files are now stored in a more efficient format in implementation-specific files in the lib directory. The format of these files is not specified and is subject to change without notice.

此更改是添加Java Platform Module System的一部分，也称为Project Jigsaw

要升级Checkstyle，请使用更高版本，例如：

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-checkstyle-plugin</artifactId>
    <version>3.0.0</version>
    <dependencies>
        <dependency>
            <groupId>com.puppycrawl.tools</groupId>
            <artifactId>checkstyle</artifactId>
            <version>8.18</version>
        </dependency>
    </dependencies>
</plugin>

请注意内部的dependency块

有关Apache Maven Checkstyle Plugin和Checkstyle的版本，请咨询Maven repo