title: Why do I get an unmappable character for encoding UTF-8 when I changed maven java compiler plugin from 1.5 to 1.6?
body: <p>I have a Java project and I'm using Apache Maven. All this time I was using Maven Java compiler plugin with parameters <em>source=1.5</em> and <em>target=1.5</em> defined in pom.xml file. Since I changed it to <em>source=1.6</em> and <em>target=1.6</em> I'm getting the following error:</p>
  
  <blockquote>
    <p>XXXXXXXX.java:[54,27] unmappable character for encoding UTF-8</p>
  </blockquote>
  
  <p>I've been testing different configurations and I turned <em>showWarnings</em> to value <em>true</em> so I could see that with value <em>1.5</em> for <em>source</em> and <em>target</em> this is a warning and not an error.</p>
  
  <p>I need to change the Java compiler configuration anyway. Does anybody know why is this so and how can I solve this problem without editing all Java source files (there are hundreds of files with this issue now)?</p>