title: Plugin execution not covered by lifecycle configuration maven error
body: <p>i imported an existing maven project but i'm getting some errors in the pom.xml :</p>
  
  <pre><code>Plugin execution not covered by lifecycle configuration: org.apache.maven.plugins:maven-
  
   compiler-plugin:2.3.2:compile (execution: default-compile, phase: compile) pom.xml 
  
   /org.squashtest.csp.tools.unittest line 50 Maven Project Build Lifecycle Mapping Problem
  </code></pre>
  
  <p>but i can't understand why ,</p>
  
  <p>Here's the pom.xml :</p>
  
  <pre><code> &lt;?xml version="1.0"?&gt;
   &lt;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/xsd/maven-4.0.0.xsd"&gt;
    &lt;modelVersion&gt;4.0.0&lt;/modelVersion&gt;
  &lt;parent&gt;
      &lt;artifactId&gt;squashtest-csp-tools&lt;/artifactId&gt;
      &lt;groupId&gt;org.squashtest.tm&lt;/groupId&gt;
      &lt;version&gt;1.2.0.RELEASE&lt;/version&gt;
  &lt;/parent&gt;
  &lt;artifactId&gt;org.squashtest.csp.tools.unittest&lt;/artifactId&gt;
  &lt;name&gt;Squashtest CSP - Tools module - Unit tests library&lt;/name&gt;
  &lt;description&gt;Library  of classes used for unit-testing other Squashtest        
       components&lt;/description&gt;
  
  &lt;dependencies&gt;
      &lt;!-- ====== GROOVY ====== --&gt;
      &lt;dependency&gt;
          &lt;groupId&gt;org.codehaus.groovy&lt;/groupId&gt;
          &lt;artifactId&gt;groovy-all&lt;/artifactId&gt;
          &lt;scope&gt;compile&lt;/scope&gt;
      &lt;/dependency&gt;
      &lt;!-- ====== /GROOVY ====== --&gt;
      &lt;dependency&gt;
          &lt;groupId&gt;org.hibernate&lt;/groupId&gt;
          &lt;artifactId&gt;org.squashtest.org.hibernate.core&lt;/artifactId&gt;
          &lt;version&gt;${hibernate.version}&lt;/version&gt;
          &lt;scope&gt;compile&lt;/scope&gt;
          &lt;optional&gt;true&lt;/optional&gt;
      &lt;/dependency&gt;
      &lt;dependency&gt;
          &lt;groupId&gt;org.unitils&lt;/groupId&gt;
          &lt;artifactId&gt;unitils-database&lt;/artifactId&gt;
          &lt;version&gt;3.1&lt;/version&gt;
          &lt;scope&gt;compile&lt;/scope&gt;
          &lt;optional&gt;true&lt;/optional&gt;
          &lt;exclusions&gt;
              &lt;exclusion&gt;
                  &lt;groupId&gt;org.slf4j&lt;/groupId&gt;
                  &lt;artifactId&gt;slf4j-nop&lt;/artifactId&gt;
              &lt;/exclusion&gt;
              &lt;exclusion&gt;
                  &lt;groupId&gt;org.slf4j&lt;/groupId&gt;
                  &lt;artifactId&gt;slf4j-api&lt;/artifactId&gt;
              &lt;/exclusion&gt;
          &lt;/exclusions&gt;
      &lt;/dependency&gt;
  &lt;/dependencies&gt;
  &lt;build&gt;
      &lt;sourceDirectory&gt;src/main/groovy&lt;/sourceDirectory&gt;
      &lt;testSourceDirectory&gt;src/test/groovy&lt;/testSourceDirectory&gt;
      &lt;plugins&gt;
      &lt;plugin&gt;
        &lt;groupId&gt;org.apache.maven.plugins&lt;/groupId&gt;
        &lt;artifactId&gt;maven-compiler-plugin&lt;/artifactId&gt;
        &lt;executions&gt;&lt;execution&gt;&lt;/execution&gt;&lt;/executions&gt;
        &lt;version&gt;2.3.2&lt;/version&gt;
        &lt;/plugin&gt; 
      &lt;/plugins&gt;
   &lt;/build&gt;
  &lt;/project&gt;
  </code></pre>
  
  <p>Thank you in advance </p>