title: Oracle SQL Developer - Driver Class not found. Vendor code 0
body: <p>I am using Oracle SQL V. 4.1.3.</p>
  
  <p>I have installed it successfully, and established connections to our database. I see the db connections, but when expanding them this error message shows up:</p>
  
  <blockquote>
    <p>Driver Class not found. Verify the Driver location. Vendor Code 0</p>
  </blockquote>
  
  <p>I installed Ms JDBC driver 6.0 for SQL Server and unpacked it in my ProgramFiles. I then went to ControlPanel-SystemProperties and added the sqljdbc42.jar as <code>&lt;installation directory&gt;\sqljdbc_&lt;version&gt;\&lt;language&gt;\sqljdbc.jar</code> under my existing environment variable called PATH.</p>
  
  <p>Now when I go to SQL Developer Properties, I see JDBC.JAR added to Java.library.path but not to java.class.path. Is this the reason I am still getting error message? How do I go about fixing it? Or is there some other issue at hand?</p>