title: i can't solve maven building error failure
body: <p>I get a error when I use maven to build my project.so please help!
  thank you for your help</p>
  
  <blockquote>
    <p>Failed to execute goal
    org.apache.maven.plugins:maven-assembly-plugin:2.2.1:assembly
    (make-assembly) on project newstart-app-ithelp: Execution
    make-assembly of goal
    org.apache.maven.plugins:maven-assembly-plugin:2.2.1:assembly failed:
    For artifact {null:null:null:jar}: The groupId cannot be empty. cause
    : Execution make-assembly of goal
    org.apache.maven.plugins:maven-assembly-plugin:2.2.1:assembly failed:
    For artifact {null:null:null:jar}: The groupId cannot be empty. Stack
    trace :  org.apache.maven.lifecycle.LifecycleExecutionException:
    Failed to execute goal
    org.apache.maven.plugins:maven-assembly-plugin:2.2.1:assembly
    (make-assembly) on project newstart-app-ithelp: Execution
    make-assembly of goal
    org.apache.maven.plugins:maven-assembly-plugin:2.2.1:assembly failed:
    For artifact {null:null:null:jar}: The groupId cannot be empty.</p>
  </blockquote>
  
  <pre><code>&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;parent&gt;
      &lt;groupId&gt;com.feinno.app&lt;/groupId&gt;
      &lt;artifactId&gt;root-pom&lt;/artifactId&gt;
      &lt;version&gt;1.0.0&lt;/version&gt;
  &lt;/parent&gt;
  &lt;modelVersion&gt;4.0.0&lt;/modelVersion&gt;
  
  &lt;groupId&gt;newstart.app&lt;/groupId&gt;
  &lt;artifactId&gt;newstart-app-ithelp&lt;/artifactId&gt;
  &lt;version&gt;0.0.1-SNAPSHOT&lt;/version&gt;
  &lt;packaging&gt;jar&lt;/packaging&gt;
  
  &lt;name&gt;newstart-app-ithelp&lt;/name&gt;
  &lt;url&gt;http://maven.apache.org&lt;/url&gt;
  
  &lt;properties&gt;
      &lt;project.build.sourceEncoding&gt;UTF-8&lt;/project.build.sourceEncoding&gt;
  &lt;/properties&gt;
  &lt;build&gt;
      &lt;plugins&gt;
          &lt;plugin&gt;
              &lt;groupId&gt;org.apache.maven.plugins&lt;/groupId&gt;
              &lt;artifactId&gt;maven-assembly-plugin&lt;/artifactId&gt;
              &lt;version&gt;2.2.1&lt;/version&gt;
              &lt;configuration&gt;
                  &lt;appendAssemblyId&gt;false&lt;/appendAssemblyId&gt;
                  &lt;descriptorRefs&gt;
                      &lt;descriptorRef&gt;jar-with-dependencies&lt;/descriptorRef&gt;
                  &lt;/descriptorRefs&gt;
                  &lt;archive&gt;
                      &lt;manifest&gt;
                          &lt;mainClass&gt;com.newstart.app.ithelp.ITHelpBean&lt;/mainClass&gt;
                      &lt;/manifest&gt;
                  &lt;/archive&gt;
              &lt;/configuration&gt;
              &lt;executions&gt;
                  &lt;execution&gt;
                      &lt;id&gt;make-assembly&lt;/id&gt;
                      &lt;phase&gt;package&lt;/phase&gt;
                      &lt;goals&gt;
                          &lt;goal&gt;assembly&lt;/goal&gt;
                      &lt;/goals&gt;
                  &lt;/execution&gt;
              &lt;/executions&gt;
          &lt;/plugin&gt;
          &lt;plugin&gt;
              &lt;groupId&gt;org.apache.maven.plugins&lt;/groupId&gt;
              &lt;artifactId&gt;maven-compiler-plugin&lt;/artifactId&gt;
              &lt;version&gt;2.3.2&lt;/version&gt;
              &lt;configuration&gt;
                  &lt;verbose&gt;true&lt;/verbose&gt;
                  &lt;fork&gt;true&lt;/fork&gt;
                  &lt;source&gt;1.6&lt;/source&gt;
                  &lt;target&gt;1.6&lt;/target&gt;
              &lt;/configuration&gt;
          &lt;/plugin&gt;
  
          &lt;plugin&gt;
              &lt;groupId&gt;org.apache.maven.plugins&lt;/groupId&gt;
              &lt;artifactId&gt;maven-surefire-plugin&lt;/artifactId&gt;
              &lt;configuration&gt;
                  &lt;skip&gt;true&lt;/skip&gt;
              &lt;/configuration&gt;
          &lt;/plugin&gt;
      &lt;/plugins&gt;
  &lt;/build&gt;
  &lt;dependencies&gt;
      &lt;dependency&gt;
          &lt;groupId&gt;org.apache.maven.plugins&lt;/groupId&gt;
          &lt;artifactId&gt;maven-resources-plugin&lt;/artifactId&gt;
          &lt;version&gt;2.4.3&lt;/version&gt;
      &lt;/dependency&gt;
      &lt;dependency&gt;
          &lt;groupId&gt;junit&lt;/groupId&gt;
          &lt;artifactId&gt;junit&lt;/artifactId&gt;
          &lt;version&gt;3.8.1&lt;/version&gt;
          &lt;scope&gt;test&lt;/scope&gt;
      &lt;/dependency&gt;
      &lt;dependency&gt;
          &lt;groupId&gt;log4j&lt;/groupId&gt;
          &lt;artifactId&gt;log4j&lt;/artifactId&gt;
          &lt;version&gt;1.2.16&lt;/version&gt;
      &lt;/dependency&gt;
      &lt;dependency&gt;
          &lt;groupId&gt;org.apache.httpcomponents&lt;/groupId&gt;
          &lt;artifactId&gt;httpclient&lt;/artifactId&gt;
          &lt;version&gt;4.1.2&lt;/version&gt;
      &lt;/dependency&gt;
      &lt;dependency&gt;
          &lt;groupId&gt;org.apache.httpcomponents&lt;/groupId&gt;
          &lt;artifactId&gt;httpmime&lt;/artifactId&gt;
          &lt;version&gt;4.1.2&lt;/version&gt;
      &lt;/dependency&gt;
      &lt;dependency&gt;
          &lt;groupId&gt;com.google.code.gson&lt;/groupId&gt;
          &lt;artifactId&gt;gson&lt;/artifactId&gt;
          &lt;version&gt;2.0&lt;/version&gt;
      &lt;/dependency&gt;
      &lt;dependency&gt;
          &lt;groupId&gt;com.feinno.app&lt;/groupId&gt;
          &lt;artifactId&gt;feinno-app-common&lt;/artifactId&gt;
          &lt;version&gt;0.0.1-SNAPSHOT&lt;/version&gt;
      &lt;/dependency&gt;
      &lt;dependency&gt;
          &lt;groupId&gt;org.quartz-scheduler&lt;/groupId&gt;
          &lt;artifactId&gt;quartz&lt;/artifactId&gt;
          &lt;version&gt;2.2.0&lt;/version&gt;
      &lt;/dependency&gt;
      &lt;dependency&gt;
          &lt;groupId&gt;mysql&lt;/groupId&gt;
          &lt;artifactId&gt;mysql-connector-java&lt;/artifactId&gt;
          &lt;version&gt;5.1.24&lt;/version&gt;
      &lt;/dependency&gt;
      &lt;dependency&gt;
          &lt;groupId&gt;com.alibaba&lt;/groupId&gt;
          &lt;artifactId&gt;druid&lt;/artifactId&gt;
          &lt;version&gt;0.2.9&lt;/version&gt;
      &lt;/dependency&gt;
      &lt;dependency&gt;
          &lt;groupId&gt;spring-aop&lt;/groupId&gt;
          &lt;artifactId&gt;spring-aop&lt;/artifactId&gt;
          &lt;version&gt;3.2.3&lt;/version&gt;
      &lt;/dependency&gt;
      &lt;dependency&gt;
          &lt;groupId&gt;spring-beans&lt;/groupId&gt;
          &lt;artifactId&gt;spring-beans&lt;/artifactId&gt;
          &lt;version&gt;3.2.3&lt;/version&gt;
      &lt;/dependency&gt;
      &lt;dependency&gt;
          &lt;groupId&gt;spring-context&lt;/groupId&gt;
          &lt;artifactId&gt;spring-context&lt;/artifactId&gt;
          &lt;version&gt;3.2.3&lt;/version&gt;
      &lt;/dependency&gt;
      &lt;dependency&gt;
          &lt;groupId&gt;spring-core&lt;/groupId&gt;
          &lt;artifactId&gt;spring-core&lt;/artifactId&gt;
          &lt;version&gt;3.2.3&lt;/version&gt;
      &lt;/dependency&gt;
      &lt;dependency&gt;
          &lt;groupId&gt;spring-jdbc&lt;/groupId&gt;
          &lt;artifactId&gt;spring-jdbc&lt;/artifactId&gt;
          &lt;version&gt;3.2.3&lt;/version&gt;
      &lt;/dependency&gt;
      &lt;dependency&gt;
          &lt;groupId&gt;spring-tx&lt;/groupId&gt;
          &lt;artifactId&gt;spring-tx&lt;/artifactId&gt;
          &lt;version&gt;3.2.3&lt;/version&gt;
      &lt;/dependency&gt;
      &lt;dependency&gt;
          &lt;groupId&gt;spring-expression&lt;/groupId&gt;
          &lt;artifactId&gt;spring-expression&lt;/artifactId&gt;
          &lt;version&gt;3.2.3&lt;/version&gt;
      &lt;/dependency&gt;
      &lt;dependency&gt;
          &lt;groupId&gt;IKAnalyzer&lt;/groupId&gt;
          &lt;artifactId&gt;IKAnalyzer&lt;/artifactId&gt;
          &lt;version&gt;6&lt;/version&gt;
      &lt;/dependency&gt;
      &lt;dependency&gt;
          &lt;groupId&gt;commons-logging&lt;/groupId&gt;
          &lt;artifactId&gt;commons-logging&lt;/artifactId&gt;
          &lt;version&gt;1.1.2&lt;/version&gt;
      &lt;/dependency&gt;
      &lt;dependency&gt;
          &lt;groupId&gt;org.apache.lucene&lt;/groupId&gt;
          &lt;artifactId&gt;lucene-core&lt;/artifactId&gt;
          &lt;version&gt;3.6.0&lt;/version&gt;
      &lt;/dependency&gt;
      &lt;dependency&gt;
          &lt;groupId&gt;net.sf.ehcache&lt;/groupId&gt;
          &lt;artifactId&gt;ehcache-core&lt;/artifactId&gt;
          &lt;version&gt;2.6.0&lt;/version&gt;
      &lt;/dependency&gt;
      &lt;dependency&gt;
          &lt;groupId&gt;linq4j&lt;/groupId&gt;
          &lt;artifactId&gt;linq4j&lt;/artifactId&gt;
          &lt;version&gt;1.0&lt;/version&gt;
      &lt;/dependency&gt;
  &lt;/dependencies&gt;
  &lt;distributionManagement&gt;
      &lt;snapshotRepository&gt;
          &lt;id&gt;snapshots&lt;/id&gt;
          &lt;url&gt;http://10.10.208.92:8081/content/repositories/snapshots&lt;/url&gt;
      &lt;/snapshotRepository&gt;
  &lt;/distributionManagement&gt;
  </code></pre>
  
  <p></p>