Getting .IncompatibleClassChangeError??

Question

Hi,
     This is part of a larger application that I had developed in Eclipse. I tried to get everything into a single Jar � but it would not work. So in one of the smaller packages, I added a few files which would not access the rest of the stuff � and I tried to call the main method from one of the files from the Jar, and it did not work.
     I have this class *�ProcessStaticFiles�* working in Eclipse. (It is in a package called *�temp_multilingual�* ) I located the class files of this package where Eclipse had put them and I did
java temp_multilingual/ProcessStaticFilesand I get
Trying to connect to MySQL Server
class com.mysql.jdbc.JDBC4Connection
Connection is NOT Null
Exception in thread "main" java.lang.IncompatibleClassChangeError: Found interface com.mysql.jdbc.Connection, but class was expected
        at temp_multilingual.TransformFileLinks.connectToDB(TransformFileLinks.java:189)
        at temp_multilingual.ProcessStaticFiles.main(ProcessStaticFiles.java:93)In this part of the code (where it is crashing), I am making the connection to the mySQL Server.
try{
      conn = (Connection) DriverManager.getConnection(JDBC_URL, USER_NAME, PASSWORD);
      System.err.println(conn.getClass());
      if(conn == null)
        System.err.println("Connection is Null");
      else
        System.err.println("Connection is NOT Null");
      if(conn.isClosed())
        System.err.println("Connection seems to be closed??");
       if(!conn.isClosed())
         st = (Statement) conn.createStatement();
    catch (SQLException se) {
      displaySQLErrors(se);
    }Why does it say *�Found interface, � but class with expected�* ?? I would like to emphasize that this works if I run it within Eclipse.
I�d be grateful if you have any ideas.
Thanks a lot.
O.O.

Answer 1

I really don�t know why I got this error. However this morning I noticed that even in Eclipse I was getting the same error as mentioned above.
I then cleaned the entire project and re-built everything again. Still it did not work. Finally I shut down Eclipse and restarted it. It works now.
I don�t know what I was doing wrong.
I am closing this question � not because I got the answer, but because I solved my problem. I am still curious though.
Thanks guys.
O.O.