java - Maven 不下载依赖项的 jar

Question

我正在尝试在我的 Windows 机器上设置 Maven。我尝试了 3.2.3 和 3.1.1。我在我的 eclipse 中安装了 m2eclipse 插件。

我将以下依赖项放在我的 pom.xml 中(仅作为示例)

<dependencies>
    <dependency>
      <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-tools</artifactId>
        <version>1.1.7.RELEASE</version>
    </dependency>
</dependencies>

Eclipse 给出错误:Missing artifact org.springframework.boot:spring-boot-tools:jar:1.1.7.RELEASE

在我的 .m2 存储库中，我有 .pom 文件和 .jar.lastUpdated 文件，但没有实际的 .jar 文件

当我执行 mvn -X clean install 时，我有以下堆栈跟踪

[ERROR] Failed to execute goal on project SpringTest_Boot: Could not resolve dependencies for project SpringTest_Boot:SpringTest_Boot:jar:0.0.1-SNAPSHOT: Failure to find org.springframework.boot:sprin
g-boot-tools:jar:1.1.7.RELEASE in http://repo.maven.apache.org/maven2 was cached in the local repository, resolution will not be reattempted until the update interval of central has elapsed or updates
 are forced -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal on project SpringTest_Boot: Could not resolve dependencies for project SpringTest_Boot:SpringTest_Boot:jar:0.0.1-SNAPSHOT
: Failure to find org.springframework.boot:spring-boot-tools:jar:1.1.7.RELEASE in http://repo.maven.apache.org/maven2 was cached in the local repository, resolution will not be reattempted until the u
pdate interval of central has elapsed or updates are forced
        at org.apache.maven.lifecycle.internal.LifecycleDependencyResolver.getDependencies(LifecycleDependencyResolver.java:220)
        at org.apache.maven.lifecycle.internal.LifecycleDependencyResolver.resolveProjectDependencies(LifecycleDependencyResolver.java:127)
        at org.apache.maven.lifecycle.internal.MojoExecutor.ensureDependenciesAreResolved(MojoExecutor.java:257)
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:200)
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
        at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:84)
        at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59)
        at org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183)
        at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161)
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:317)
        at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:152)
        at org.apache.maven.cli.MavenCli.execute(MavenCli.java:555)
        at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:214)
        at org.apache.maven.cli.MavenCli.main(MavenCli.java:158)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:483)
        at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289)
        at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)
        at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)
        at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)
Caused by: org.apache.maven.project.DependencyResolutionException: Could not resolve dependencies for project SpringTest_Boot:SpringTest_Boot:jar:0.0.1-SNAPSHOT: Failure to find org.springframework.bo
ot:spring-boot-tools:jar:1.1.7.RELEASE in http://repo.maven.apache.org/maven2 was cached in the local repository, resolution will not be reattempted until the update interval of central has elapsed or
 updates are forced
        at org.apache.maven.project.DefaultProjectDependenciesResolver.resolve(DefaultProjectDependenciesResolver.java:198)
        at org.apache.maven.lifecycle.internal.LifecycleDependencyResolver.getDependencies(LifecycleDependencyResolver.java:195)
        ... 22 more
Caused by: org.eclipse.aether.resolution.DependencyResolutionException: Failure to find org.springframework.boot:spring-boot-tools:jar:1.1.7.RELEASE in http://repo.maven.apache.org/maven2 was cached i
n the local repository, resolution will not be reattempted until the update interval of central has elapsed or updates are forced
        at org.eclipse.aether.internal.impl.DefaultRepositorySystem.resolveDependencies(DefaultRepositorySystem.java:384)
        at org.apache.maven.project.DefaultProjectDependenciesResolver.resolve(DefaultProjectDependenciesResolver.java:192)
        ... 23 more
Caused by: org.eclipse.aether.resolution.ArtifactResolutionException: Failure to find org.springframework.boot:spring-boot-tools:jar:1.1.7.RELEASE in http://repo.maven.apache.org/maven2 was cached in
the local repository, resolution will not be reattempted until the update interval of central has elapsed or updates are forced
        at org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolve(DefaultArtifactResolver.java:459)
        at org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolveArtifacts(DefaultArtifactResolver.java:262)
        at org.eclipse.aether.internal.impl.DefaultRepositorySystem.resolveDependencies(DefaultRepositorySystem.java:367)
        ... 24 more
Caused by: org.eclipse.aether.transfer.ArtifactNotFoundException: Failure to find org.springframework.boot:spring-boot-tools:jar:1.1.7.RELEASE in http://repo.maven.apache.org/maven2 was cached in the
local repository, resolution will not be reattempted until the update interval of central has elapsed or updates are forced
        at org.eclipse.aether.internal.impl.DefaultUpdateCheckManager.newException(DefaultUpdateCheckManager.java:232)
        at org.eclipse.aether.internal.impl.DefaultUpdateCheckManager.checkArtifact(DefaultUpdateCheckManager.java:206)
        at org.eclipse.aether.internal.impl.DefaultArtifactResolver.gatherDownloads(DefaultArtifactResolver.java:599)
        at org.eclipse.aether.internal.impl.DefaultArtifactResolver.performDownloads(DefaultArtifactResolver.java:518)
        at org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolve(DefaultArtifactResolver.java:436)
        ... 26 more
[ERROR]
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/DependencyResolutionException
O:\Clouds\Dropbox\Repositories\git\Spring Comparison Test\Boot>mvn -X clean install

Answer 1

问题是您使用了一个存在但由于任何原因(下载问题/代理等)无法下载的版本。

在您的本地存储库 ${HOME}/.m2/repository/org.springframewokr/boot 中，您需要删除文件夹 spring-boot-tools 并尝试重建。

除此之外，使用的 Artifact 不是 jar 文件，它是多模块构建的父级，不能用作依赖项。您需要查看文档，您必须使用哪种 Artifact 。

更新:

根据您必须以不同方式定义 pom 的文档:

<project...>

  <dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
        <version>...</version>
    </dependency>
  </dependencies>
</project>