Question

我正在尝试发现我本地存储库中安装的archtypes。我读过这可能会运行以下命令：

mvn archetype：crawl

现在，当我运行此命令时，我收到此错误：

    [ERROR] Failed to execute goal org.apache.maven.plugins:maven-archetype-plugin:2.2:crawl (default-cli) on project standalone-pom: Execution default-cli of goal org.apache.maven.plugins:maven-archetype-plugin:2.2:crawl failed. NullPointerException -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.apache.maven.plugins:maven-archetype-plugin:2.2:crawl (default-cli) on project standalone-pom: Execution default-cli of goal org.apache.maven.plugins:maven-archetype-plugin:2.2:crawl failed.
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:224)
    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: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: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.plugin.PluginExecutionException: Execution default-cli of goal org.apache.maven.plugins:maven-archetype-plugin:2.2:crawl failed.
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:115)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:208)
    ... 19 more
Caused by: java.lang.NullPointerException
    at org.apache.maven.archetype.common.DefaultArchetypeArtifactManager.closeZipFile(DefaultArchetypeArtifactManager.java:584)
    at org.apache.maven.archetype.common.DefaultArchetypeArtifactManager.isFileSetArchetype(DefaultArchetypeArtifactManager.java:196)
    at org.apache.maven.archetype.repositorycrawler.DefaultRepositoryCrawler.crawl(DefaultRepositoryCrawler.java:72)
    at org.apache.maven.archetype.mojos.CrawlRepositoryMojo.execute(CrawlRepositoryMojo.java:70)
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:106)
    ... 20 more

Answer 1

我遇到了同样的问题。在构建失败之前出现“打开zip文件时出错”的空指针。我通过删除有问题的文件来解决这个问题，这个文件是在我当地的maven存储库中被破坏的jar（尝试用winrar打开时出错）。

Answer 2

这似乎是已知maven-archetype-plugin版旧版bug。尝试明确指定上一个稳定的插件版本：

mvn org.apache.maven.plugins：maven-archetype-plugin：2.2：crawl

如果错误仍然存在，请尝试检查本地maven存储库文件夹中的文件权限。对于其中的所有jar文件，至少应该有“读取”权限。

如果您使用-X开关运行maven，您可能会在BUILD FAILURE消息之前的控制台日志中找到问题的真正原因。像[DEBUG] org.apache.maven.archetype.exception.UnknownArchetype: java.io.FileNotFoundException: /path/to/file.jar (Access denied)

这样的东西

NullPointerException原型：crawl

2 个答案: