title: Show compiler warnings without editing pom.xml
body: <p>I would like to always show compiler warning and deprecation when I compile with Maven. I know how to do it by editing the <code>pom.xml</code>, but I want this behavior by default only for myself (so I can't edit the <code>pom.xml</code>).</p>
  
  <p>I tried:</p>
  
  <pre><code>mvn -Dmaven.compiler.showWarnings=true -Dmaven.compiler.showDeprecation=true clean compile
  </code></pre>
  
  <p>but this doesn't show any warnings (if I modify the <code>pom.xml</code> to show them, they are there).</p>
  
  <p>Both expressions (<code>maven.compiler.showWarnings</code> and <code>maven.compiler.showDeprecation</code>) <a href="http://maven.apache.org/plugins/maven-compiler-plugin/compile-mojo.html#showWarnings" rel="noreferrer">exist</a>.</p>
  
  <p>What do I miss?</p>