Java Maven站点插件的问题

我下载了Jetty source并尝试运行以下maven命令：

mvn clean compile site -DskipTests -e

但问题是maven站点插件不起作用。我使用Maven 3.0.5（也尝试了最新版本）和Maven站点插件3.3

错误如下所示：

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-site-plugin:3.3:site (default-site) on project jetty-project: failed to get report for org.apache.maven.plugins:maven-javadoc-plugin: Failed to execute goal org.apache.maven.plugins:maven-dependency-plugin:2.2:copy-dependencies (copy-lib-deps) on project jetty-ant: Error copying artifact from /jetty/jetty-io/target/classes to /jetty/jetty-ant/target/test-lib/jetty-io-9.1.3-SNAPSHOT.jar: /jetty/jetty-io/target/classes (Is a directory) -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.apache.maven.plugins:maven-site-plugin:3.3:site (default-site) on project jetty-project: failed to get report for org.apache.maven.plugins:maven-javadoc-plugin
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:217)
    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:320)
    at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156)
    at org.apache.maven.cli.MavenCli.execute(MavenCli.java:537)
    at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:196)
    at org.apache.maven.cli.MavenCli.main(MavenCli.java:141)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:290)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:230)
    at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:409)
    at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:352)
Caused by: org.apache.maven.plugin.MojoExecutionException: failed to get report for org.apache.maven.plugins:maven-javadoc-plugin
    at org.apache.maven.reporting.exec.DefaultMavenReportExecutor.buildMavenReports(DefaultMavenReportExecutor.java:159)
    at org.apache.maven.plugins.site.AbstractSiteRenderingMojo.getReports(AbstractSiteRenderingMojo.java:235)
    at org.apache.maven.plugins.site.SiteMojo.execute(SiteMojo.java:121)
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)
    ... 19 more
Caused by: org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.apache.maven.plugins:maven-dependency-plugin:2.2:copy-dependencies (copy-lib-deps) on project jetty-ant: Error copying artifact from /jetty/jetty-io/target/classes to /jetty/jetty-ant/target/test-lib/jetty-io-9.1.3-SNAPSHOT.jar
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:217)
    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.MojoExecutor.executeForkedExecutions(MojoExecutor.java:365)
    at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeForkedExecutions(DefaultLifecycleExecutor.java:173)
    at org.apache.maven.reporting.exec.DefaultMavenReportExecutor.buildReportPlugin(DefaultMavenReportExecutor.java:273)
    at org.apache.maven.reporting.exec.DefaultMavenReportExecutor.buildMavenReports(DefaultMavenReportExecutor.java:154)
    ... 23 more
Caused by: org.apache.maven.plugin.MojoExecutionException: Error copying artifact from /jetty/jetty-io/target/classes to /jetty/jetty-ant/target/test-lib/jetty-io-9.1.3-SNAPSHOT.jar
    at org.apache.maven.plugin.dependency.AbstractDependencyMojo.copyFile(AbstractDependencyMojo.java:194)
    at org.apache.maven.plugin.dependency.CopyDependenciesMojo.copyArtifact(CopyDependenciesMojo.java:199)
    at org.apache.maven.plugin.dependency.CopyDependenciesMojo.execute(CopyDependenciesMojo.java:90)
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)
    ... 29 more
Caused by: java.io.FileNotFoundException: /jetty/jetty-io/target/classes (Is a directory)
    at java.io.FileInputStream.open(Native Method)
    at java.io.FileInputStream.<init>(FileInputStream.java:138)
    at org.codehaus.plexus.util.io.FileInputStreamFacade.getInputStream(FileInputStreamFacade.java:78)
    at org.codehaus.plexus.util.FileUtils.copyStreamToFile(FileUtils.java:1024)
    at org.codehaus.plexus.util.FileUtils.copyFile(FileUtils.java:932)
    at org.apache.maven.plugin.dependency.AbstractDependencyMojo.copyFile(AbstractDependencyMojo.java:189)
    ... 33 more
[ERROR] 
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[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/MojoExecutionException

<plugin>
    <artifactId>maven-site-plugin</artifactId>
    <version>3.3</version>
    <executions>
      <execution>
        <id>attach-descriptor</id>
        <goals>
          <goal>attach-descriptor</goal>
        </goals>
      </execution>
    </executions>
</plugin>

[ERROR]无法执行goal org.apache.maven.plugins:maven site plugin:3.3:project jetty项目上的site（默认站点）：无法获取org.apache.maven.plugins:maven javadoc plugin的报告：无法执行goal org.apache.maven.plugins:maven依赖插件：2.2:copy dependencies（copy lib deps）在jetty ant项目上：将工件从/jetty/jetty io/target/classes复制到/jetty/jetty ant/target/test lib/jetty-io-9.1.3-SNAPSHOT.jar时出错：/jetty/jetty io/target/classes（是一个目录）->[Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException:未能执行目标org.apache.maven.plugins:maven站点插件：3.3:project jetty上的站点（默认站点）：未能获取org.apache.maven.plugins:maven javadoc插件的报告
位于org.apache.maven.lifecycle.internal.MojoExecutor.execute（MojoExecutor.java:217）
位于org.apache.maven.lifecycle.internal.MojoExecutor.execute（MojoExecutor.java:153）
位于org.apache.maven.lifecycle.internal.MojoExecutor.execute（MojoExecutor.java:145）
位于org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject（LifecycleModuleBuilder.java:84）
位于org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject（LifecycleModuleBuilder.java:59）
位于org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild（LifecycleStarter.java:183）
位于org.apache.maven.lifecycle.internal.LifecycleStarter.execute（LifecycleStarter.java:161）
在org.apache.maven.DefaultMaven.doExecute（DefaultMaven.java:320）
在org.apache.maven.DefaultMaven.execute（DefaultMaven.java:156）上
位于org.apache.maven.cli.MavenCli.execute（MavenCli.java:537）
位于org.apache.maven.cli.MavenCli.doMain（MavenCli.java:196）
位于org.apache.maven.cli.MavenCli.main（MavenCli.java:141）
在sun.reflect.NativeMethodAccessorImpl.invoke0（本机方法）处
在sun.reflect.NativeMethodAccessorImpl.invoke（NativeMethodAccessorImpl.java:57）中
在sun.reflect.DelegatingMethodAccessorImpl.invoke（DelegatingMethodAccessorImpl.java:43）中
位于java.lang.reflect.Method.invoke（Method.java:606）
位于org.codehaus.plexus.classworlds.launcher.launcher.launchEnhanced（launcher.java:290）
位于org.codehaus.plexus.classworlds.launcher.launcher.launch（launcher.java:230）
位于org.codehaus.plexus.classworlds.launcher.launcher.mainWithExitCode（launcher.java:409）
位于org.codehaus.plexus.classworlds.launcher.launcher.main（launcher.java:352）
原因：org.apache.maven.plugin.MojoExecutionException:未能获取org.apache.maven.plugins:maven javadoc plugin的报告
位于org.apache.maven.reporting.exec.DefaultMavenReportExecutor.buildMavenReports（DefaultMavenReportExecutor.java:159）
位于org.apache.maven.plugins.site.AbstractSiteRenderingMojo.getReports（AbstractSiteRenderingMojo.java:235）
位于org.apache.maven.plugins.site.SiteMojo.execute（SiteMojo.java:121）
位于org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo（DefaultBuildPluginManager.java:101）
位于org.apache.maven.lifecycle.internal.MojoExecutor.execute（MojoExecutor.java:209）
... 还有19个
原因：org.apache.maven.lifecycle.LifecycleExecutionException:未能执行目标org.apache.maven.plugins:maven依赖插件：2.2:复制jetty ant项目上的依赖项（复制库deps）：将工件从/jetty/jetty io/target/classes复制到/jetty/jetty ant/target/test lib/jetty-io-9.1.3-SNAPSHOT.jar时出错
位于org.apache.maven.lifecycle.internal.MojoExecutor.execute（MojoExecutor.java:217）
位于org.apache.maven.lifecycle.internal.MojoExecutor.execute（MojoExecutor.java:153）
位于org.apache.maven.lifecycle.internal.MojoExecutor.execute（MojoExecutor.java:145）
位于org.apache.maven.lifecycle.internal.MojoExecutor.executeforkeredexecutions（MojoExecutor.java:365）
位于org.apache.maven.lifecycle.DefaultLifecycleExecutor.ExecuteForkeredExecutions（DefaultLifecycleExecutor.java:173）
位于org.apache.maven.reporting.exec.DefaultMavenReportExecutor.buildReportPlugin（DefaultMavenReportExecutor.java:273）
位于org.apache.maven.reporting.exec.DefaultMavenReportExecutor.buildMavenReports（DefaultMavenReportExecutor.java:154）
... 23多
原因：org.apache.maven.plugin.MojoExecutionException:将工件从/jetty/jetty io/target/classes复制到/jetty/jetty ant/target/test lib/jetty-io-9.1.3-SNAPSHOT.jar时出错
位于org.apache.maven.plugin.dependency.AbstractDependencyMojo.copyFile（AbstractDependencyMojo.java:194）
位于org.apache.maven.plugin.dependency.CopyDependenciesMojo.copyArtifact（CopyDependenciesMojo.java:199）
位于org.apache.maven.plugin.dependency.CopyDependenciesMojo.execute（CopyDependenciesMojo.java:90）
位于org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo（DefaultBuildPluginManager.java:101）
位于org.apache.maven.lifecycle.internal.MojoExecutor.execute（MojoExecutor.java:209）
... 还有29个
原因：java.io.FileNotFoundException:/jetty/jetty io/target/classes（是一个目录）
在java.io.FileInputStream.open（本机方法）
位于java.io.FileInputStream。（FileInputStream.java:138）
位于org.codehaus.plexus.util.io.FileInputStreamFacade.getInputStream（FileInputStreamFacade.java:78）
位于org.codehaus.plexus.util.FileUtils.copyStreamToFile（FileUtils.java:1024）
位于org.codehaus.plexus.util.FileUtils.copyFile（FileUtils.java:932）
位于org.apache.maven.plugin.dependency.AbstractDependencyMojo.copyFile（AbstractDependencyMojo.java:189）
... 33多
[错误]
[错误]使用-X开关重新运行Maven以启用完整调试日志记录。
[错误]
[错误]有关错误和可能的解决方案的更多信息，请阅读以下文章：
[错误][帮助1]http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException

插件配置