title: Not able to see the results by using Dbms_Output.Put_Line
body: <p>I am not able to see the results by using Dbms_Output.Put_Line in sql developer. The result is shown only once. When I execute it again, it is not shown. 
  I checked a lot of workarounds described in google, but those haven't worked for me.</p>
  
  <p>I am executing following:</p>
  
  <pre><code>set serveroutput on;
  
  BEGIN
  
   Dbms_Output.Put_Line('hello1');
  
  END;
  </code></pre>
  
  <p>It should print 'hello1', everytime it executes, but instead, it does so only during first run. I have also tried the only resolution available on google: 
  Opening the 'view' menu and clicking on 'dbms output'. I got a dbms output window at the bottom of the worksheet. I then added the connection by clicking on plus sign appearing in window. But even that did not work for me.
  Please can anyone help me here?</p>