小编MrD*_*ews的帖子

我正在使用Indigo Release of eclipse.当我检查Window - > Preferences,Maven - > Installations时,它确认它正在使用Maven的Embedded(3.0.2/...)安装.

我希望能够从命令行(Windows Powershell)运行maven命令,但是当我键入时,例如,

PS C:\> mvn

找不到可执行文件.我搜索了"mvn.exe",但未找到任何结果.

我想我可以安装一个独立版本的Maven 3并将其添加到我的PATH中,但我更喜欢使用相同的Maven安装来执行命令行任务以及IDE(eclipse)任务.

那么,嵌入式maven的mvn.exe隐藏在哪里？

我创建了一个新的scala项目,其中包含以下内容:

mvn org.apache.maven.plugins:maven-archetype-plugin:2.2:generate 
    -DarchetypeGroupId=org.scala-tools.archetypes 
    -DarchetypeArtifactId=scala-archetype-simple 
    -DarchetypeVersion=1.3 
    -DgroupId=myGroup 
    -DartifactId=myProject
    -Dversion=0.1.0 
    -DinteractiveMode=false

这给了我以下POM:

 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <groupId>myGroup</groupId>
   <artifactId>myProject</artifactId>
   <version>0.1.0</version>
   <name>${project.artifactId}</name>
   <description>My wonderfull scala app</description>
   <inceptionYear>2010</inceptionYear>
   <licenses>
     <license>
       <name>My License</name>
       <url>http://....</url>
       <distribution>repo</distribution>
     </license>
   </licenses>

   <properties>
     <maven.compiler.source>1.5</maven.compiler.source>
     <maven.compiler.target>1.5</maven.compiler.target>
     <encoding>UTF-8</encoding>
     <scala.version>2.8.0</scala.version>
   </properties>

 <!--
   <repositories>
     <repository>
       <id>scala-tools.org</id>
       <name>Scala-Tools Maven2 Repository</name>
       <url>http://scala-tools.org/repo-releases</url>
     </repository>
   </repositories>

   <pluginRepositories>
     <pluginRepository>
       <id>scala-tools.org</id>
       <name>Scala-Tools Maven2 Repository</name>
       <url>http://scala-tools.org/repo-releases</url>
     </pluginRepository>
   </pluginRepositories>
 -->
   <dependencies>
     <dependency>
       <groupId>org.scala-lang</groupId>
       <artifactId>scala-library</artifactId>
       <version>${scala.version}</version>
     </dependency>

     <!-- Test -->
     <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
       <version>4.8.1</version>
       <scope>test</scope>
     </dependency>
     <dependency>
       <groupId>org.scala-tools.testing</groupId>
       <artifactId>specs_${scala.version}</artifactId>
       <version>1.6.5</version>
       <scope>test</scope> …

我试图做一些看似相当简单的事情:总结一组列表的大小.Netbeans给出以下警告/错误:

actual argument java.util.ArrayList<java.util.TreeSet<java.lang.Integer>> cannot be    converted to java.util.List<java.util.Set<java.lang.Object>> by method invocation conversion

对于以下两段代码:

/**
 * Sums the sizes of all sets in a list.  Note that while there will be
 * no duplicate elements in a single set, "sister" sets may contain
 * elements, so the value returned is **not** equal to the number of unique
 * elements in all sets.
 * @param list, a List of Sets
 * @return the number of elements contained in all sets
 */ …