title: Maven JavaDoc plugin giving warnings instead of Errors
body: <p>i have added maven java doc plugin dependency in my pox.xml as below</p>
  
  <pre><code>&lt;plugin&gt;
                  &lt;groupId&gt;org.apache.maven.plugins&lt;/groupId&gt;
                  &lt;artifactId&gt;maven-javadoc-plugin&lt;/artifactId&gt;
                  &lt;version&gt;3.0.0&lt;/version&gt;
                  &lt;executions&gt;
                      &lt;execution&gt;
                          &lt;id&gt;attach-javadocs&lt;/id&gt;
                          &lt;goals&gt;
                              &lt;goal&gt;jar&lt;/goal&gt;
                          &lt;/goals&gt;
                      &lt;/execution&gt;
                  &lt;/executions&gt;
              &lt;/plugin&gt;
  </code></pre>
  
  <p>And using java version 1.8, but its throwing warnings instead of errors when comments are missing or when there is no description.
  i want it to throw errors, can any one please help with this? Thanks in advance!
  It was throwing the below warnings in the console</p>
  
  <pre><code>7 warnings
  [WARNING] Javadoc Warnings
  [WARNING] javadoc: warning - Multiple sources of package comments found for package "javax.servlet"
  [WARNING] javadoc: warning - Multiple sources of package comments found for package "javax.servlet.http"
  [WARNING] C:\SOFTDEV\LPIS\LPISDEPT\WEBAPP\branches\DEVELOPMENT\web\lpis_web\src\main\java\ie\gov\agriculture\lpis\web\auth\servlet\LPISAuthenticationServlet.java:61: warning: no description for @throws
  [WARNING] * @throws IOException
  [WARNING] ^
  [WARNING] C:\SOFTDEV\LPIS\LPISDEPT\WEBAPP\branches\DEVELOPMENT\web\lpis_web\src\main\java\ie\gov\agriculture\lpis\web\editcache\filter\attribute\EditFilterAttribute.java:32: warning: no description for @param
  [WARNING] * @param currentEntityFilter
  [WARNING] ^
  [WARNING] C:\SOFTDEV\LPIS\LPISDEPT\WEBAPP\branches\DEVELOPMENT\web\lpis_web\src\main\java\ie\gov\agriculture\lpis\web\editcache\filter\factory\EntityFilter.java:19: warning: no description for @param
  [WARNING] * @param projectId
  [WARNING] ^
  [WARNING] C:\SOFTDEV\LPIS\LPISDEPT\WEBAPP\branches\DEVELOPMENT\web\lpis_web\src\main\java\ie\gov\agriculture\lpis\web\editcache\filter\factory\EntityFilter.java:20: warning: no description for @param
  [WARNING] * @param attributeValues
  [WARNING] ^
  [WARNING] C:\SOFTDEV\LPIS\LPISDEPT\WEBAPP\branches\DEVELOPMENT\web\lpis_web\src\main\java\ie\gov\agriculture\lpis\web\editcache\filter\factory\FilterFactory.java:40: warning: no description for @param
  [WARNING] * @param parameter
  [WARNING] ^
  </code></pre>