Question

我是Maven的新手。你知道我做错了吗（见下文）？

mvn -e clean:help.  
+ Error stacktraces are turned on.  
[INFO] Scanning for projects...  
[INFO] Searching repository for plugin with prefix: 'clean'.  
[INFO] ------------------------------------------------------------------------ 
[ERROR] BUILD FAILURE  
[INFO] ------------------------------------------------------------------------  
[INFO] Required goal not found: clean:help in org.apache.maven.plugins:maven-clean-plugin:2.2  
[INFO] ------------------------------------------------------------------------  
[INFO] Trace  
org.apache.maven.BuildFailureException: Required goal not found: clean:help in org.apache.maven.plugins:maven-clean-plugin:2.2
    at   org.apache.maven.lifecycle.DefaultLifecycleExecutor.getMojoDescriptor(DefaultLifecycleExecutor.java:1867)
    at   org.apache.maven.lifecycle.DefaultLifecycleExecutor.segmentTaskListByAggregationNeeds(DefaultLifecycleExecutor.java:462)
    at   org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:175)
    at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:328)

Answer 1

您在命令行（2.2）上使用的插件版本没有clean:help目标（自2.3起）。试试这个：

mvn org.apache.maven.plugins:maven-clean-plugin:2.4:help

Answer 2

我想你想要：

mvn help:describe -Dcmd=clean

给出：

[INFO] [help:describe {execution: default-cli}]
[INFO] 'clean' is a lifecycle with the following phases: 
* pre-clean: Not defined
* clean: org.apache.maven.plugins:maven-clean-plugin:clean
* post-clean: Not defined

有关详细信息和示例，请参阅here。这同样适用于compile。

mvn help:describe -Dcmd=compile

Maven：无法实现帮助目标（干净：帮助，编译器：帮助等）

2 个答案: