title: Connection could not be allocated because: User id length (0) is outside the range of 1 to 255
body: <p>I'm creating a login interface using Netbeans with JSF, EJB and JPA. When I try to deploy the project, it throws the below exception:</p>
  
  <pre><code>Internal Exception: java.sql.SQLException: 
  Error in allocating a connection. Cause: Connection could not be allocated because: User id length (0) is outside the range of 1 to 255.
  Error Code: 0. Please see server.log for more details.
  C:\Users\Dell\Desktop\assignmenttask2\nbproject\build-impl.xml:1033: The module has not been deployed.
  See the server log for details.
  </code></pre>
  
  <p>How is this caused and how can I solve it?</p>