title: IO Error: The Network Adapter could not establish the connection
body: <p>I am new to Oracle, and am trying to run a simple example code with Java, but am getting this error when executing the code.. I am able to start up the listener via CMD and am also able to run SQL Plus. Can anyone give me a hand and tell me what I might be doing wrong?</p>
  
  <p>Update:
  I am using JDBC.</p>
  
  <p>Database is local, and I actually had it working but it stopped working just today. I'm not really sure why though. Would you mind giving me some procedures to follow by since I don't know much.</p>