Missing Artifact, Could not resolve dependencies, was not found in https://repo.maven.apache.org/maven2 during a previous attempt

Question

我试图向我的项目添加一个新的依赖项（Easy-Rules）：

但是依赖标签是红色下划线的：

Missing artifact org.jeasy:easy-rules:jar:4.1.0

如果我尝试运行 maven clean install

Failed to execute goal on project architecture-utils: Could not resolve dependencies for project com.paulmarcelinbejan:architecture-utils:jar:1.0.0: org.jeasy:easy-rules:jar:4.1.0 was not found in https://repo.maven.apache.org/maven2 during a previous attempt. This failure was cached in the local repository and resolution is not reattempted until the update interval of central has elapsed or updates are forced -> [Help 1]

为什么会这样？ 可以在 repo.maven.apache.org 轻松找到简单规则

这只会在这种依赖下发生。

例如，如果我从 maven 中央存储库 (msgpack) 添加另一个依赖项，它就可以正常工作。

并且 jar 文件已正确下载到本地存储库中。

我的pom.xml：

<?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>

    <parent>
        <groupId>com.paulmarcelinbejan</groupId>
        <artifactId>architecture</artifactId>
        <version>1.0.0</version>
    </parent>

    <artifactId>architecture-utils</artifactId>

    <properties>
        <easyrules.version>4.1.0</easyrules.version>
    </properties>

    <dependencies>

        <dependency>
            <groupId>com.paulmarcelinbejan</groupId>
            <artifactId>architecture-constants</artifactId>
        </dependency>
        <dependency>
            <groupId>com.paulmarcelinbejan</groupId>
            <artifactId>architecture-annotations</artifactId>
        </dependency>
        
        <!-- Jackson -->
        <dependency>
            <groupId>com.fasterxml.jackson.dataformat</groupId>
            <artifactId>jackson-dataformat-csv</artifactId>
            <version>${jackson.version}</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.dataformat</groupId>
            <artifactId>jackson-dataformat-yaml</artifactId>
            <version>${jackson.version}</version>
        </dependency>
        
        <dependency>
            <groupId>org.jeasy</groupId>
            <artifactId>easy-rules</artifactId>
            <version>${easyrules.version}</version>
        </dependency>
        
    </dependencies>

</project>

我的settings.xml

<settings xmlns="http://maven.apache.org/SETTINGS/1.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0 https://maven.apache.org/xsd/settings-1.0.0.xsd">
  <localRepository>${user.home}/Develop/Personal/maven/repository</localRepository>
  <interactiveMode>true</interactiveMode>
  <offline>false</offline>
</settings>

Answer 1

如果你看一下 Maven Central 上的文件，你会发现没有 JAR。该工件仅包含一个 pom 文件及其散列和签名。

easy-rules

只是父项目，包括其模块的配置。

但是如果你想使用（非 pom）依赖，你需要使用一个实际包含 JAR 的工件。在您的情况下，这可能是 easy-rules-core:

<dependency>
    <groupId>org.jeasy</groupId>
    <artifactId>easy-rules</artifactId>
    <version>${easyrules.version}</version>
</dependency> 

这也包含在easy-rules GitHub存储库

的

wiki的Use with Maven-section中。