Question

我已完成以下步骤：

已安装的Java 1.6
我使用的是Ubuntu 11.10。在/etc/bash.bachrc
已安装的maven。 mvn --version正确显示已安装的maven。
从http://svn.apache.org/repos/asf/mahout/trunk

现在，我进入mahout / trunk并尝试mvn clean install或mvn clean install -X -e，然后它会发出以下错误 -

无法执行mojo：资源。它需要一个现有的项目 pom.xml，但构建没有使用。

我只想尝试mahout / examples中的示例。如何解决此错误？

目录中有一个pom.xml。

完整的终端输出在这里：

+ Error stacktraces are turned on.
Apache Maven 2.2.1 (rdebian-6)
Java version: 1.6.0_23
Java home: /usr/lib/jvm/java-6-openjdk/jre
Default locale: en_IN, platform encoding: UTF-8
OS name: "linux" version: "3.0.0-16-generic" arch: "i386" Family: "unix"
[DEBUG] Building Maven user-level plugin registry from: '/home/kartikeya/.m2/plugin-registry.xml'
[DEBUG] Building Maven global-level plugin registry from: '/usr/share/maven2/conf/plugin-registry.xml'
[INFO] Scanning for projects...
[DEBUG] Wagons could not be registered as the extension container was never created
[INFO] ------------------------------------------------------------------------
[INFO] Building Maven Default Project
[INFO]    task-segment: [clean, install]
[INFO] ------------------------------------------------------------------------
[DEBUG] Retrieving parent-POM: org.apache.maven.plugins:maven-plugins:pom:12 for project: null:maven-clean-plugin:maven-plugin:2.3 from the repository.
[DEBUG] Retrieving parent-POM: org.apache.maven:maven-parent:pom:9 for project: org.apache.maven.plugins:maven-plugins:pom:12 from the repository.
[DEBUG] Retrieving parent-POM: org.apache:apache:pom:4 for project: org.apache.maven:maven-parent:pom:9 from the repository.
[INFO] ------------------------------------------------------------------------
[ERROR] BUILD ERROR
[INFO] ------------------------------------------------------------------------
[INFO] Cannot execute mojo: clean. It requires a project with an existing pom.xml, but the build is not using one.
[INFO] ------------------------------------------------------------------------
[DEBUG] Trace
org.apache.maven.lifecycle.LifecycleExecutionException: Cannot execute mojo: clean. It requires a project with an existing pom.xml, but the build is not using one.
    at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:719)
    at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalWithLifecycle(DefaultLifecycleExecutor.java:556)
    at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:535)
    at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLifecycleExecutor.java:387)
    at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleExecutor.java:348)
    at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:180)
    at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:328)
    at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:138)
    at org.apache.maven.cli.MavenCli.main(MavenCli.java:362)
    at org.apache.maven.cli.compat.CompatibleMain.main(CompatibleMain.java:60)
    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:616)
    at org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:315)
    at org.codehaus.classworlds.Launcher.launch(Launcher.java:255)
    at org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:430)
    at org.codehaus.classworlds.Launcher.main(Launcher.java:375)
Caused by: org.apache.maven.plugin.MojoExecutionException: Cannot execute mojo: clean. It requires a project with an existing pom.xml, but the build is not using one.
    at org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:414)
    at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:694)
    ... 17 more
[INFO] ------------------------------------------------------------------------
[INFO] Total time: < 1 second
[INFO] Finished at: Wed Mar 21 11:32:36 IST 2012
[INFO] Final Memory: 2M/55M
[INFO] ------------------------------------------------------------------------

Answer 1

谢谢ajozwik和Owen。

我从aptitude安装了maven2。我采取了以下步骤来解决此问题：

删除了Maven2 sudo apt-get remove maven2
根据 - Installing maven2 without openjdk
即使这样做，我也收到了错误 -

Unable to locate the javac Compiler in:[ERROR] /usr/lib/jvm/java-6-openjdk/jre/../lib/tools.jar

要解决此问题，需要重新安装JDK。它对我有用！对于那些人来说，如果这个解决方案不起作用，请查看 - Why maven ignores my JAVA_HOME?

问候。

Answer 2

＆＃34;无法执行mojo：资源。它需要一个带有现有pom.xml＆＃34;

的项目

此错误表示工作目录中没有pom.xml

尝试编译mahout但收到错误 - 无法执行mojo：resources。 Build不使用pom.xml

2 个答案: