title: How to print all play framework crash?
body: <p>I am using play framework v2.0.3.</p>
  
  <p>I need to know how to see all the system log. 
  For example, missing dependence jars,throw exception, etc.<br>
  what I see is that it just stuck or web socket get stuck after decoding .</p>
  
  <p>I'm using logback as a logger.</p>
  
  <p>This is the <code>logger.xml</code></p>
  
  <pre class="lang-xml prettyprint-override"><code>&lt;configuration&gt;
  
      &lt;appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender"&gt;
          &lt;!-- encoders are assigned the type ch.qos.logback.classic.encoder.PatternLayoutEncoder 
              by default --&gt;
          &lt;encoder&gt;
              &lt;pattern&gt;%d{HH:mm:ss.SSS} %-5level %logger{36} - %msg%n&lt;/pattern&gt;
          &lt;/encoder&gt;
      &lt;/appender&gt;
  
      &lt;appender name="FILE" class="ch.qos.logback.core.FileAppender"&gt;
       &lt;file&gt;${application.home}/logs/application.log&lt;/file&gt;
       &lt;encoder&gt;
         &lt;pattern&gt;%date - [%level] - from %logger in %thread %n%message%n%xException%n&lt;/pattern&gt;
       &lt;/encoder&gt;
     &lt;/appender&gt;
  
     &lt;logger name="play" level="ERROR" /&gt;
     &lt;logger name="application" level="ERROR" /&gt;
  
      &lt;root level="ERROR"&gt;
          &lt;appender-ref ref="STDOUT" /&gt;
          &lt;appender-ref ref="FILE" /&gt;
      &lt;/root&gt;
  &lt;/configuration&gt;
  </code></pre>
  
  <p>Thanks.</p>