SQL statement not executing

Question

Please enlighten me. This is driving me crazy.
I don't know if this is a database or java code related problem.
JVM: 1.4.2
Database: Oracle 9i
Objective: trying to add a row into a table
Problem: 1. SQL statement never gets executed.
2. Application freezes. I have to terminate it myself.
Any Ideas?
void addCourse(){
try {
    DriverManager.registerDriver ( new oracle.jdbc.driver.OracleDriver () ) ;
   System.out.println("Driver registered");  //---> ok.
Connection conn = DriverManager.getConnection ( dbPath, username, password ) ;
   System.out.println("Connected");   // -----> it connects fine
   ResultSet rset = stmt.getResultSet();
   System.out.println("getting result set");  //-----> gets the resultSet fine
  Statement stmt = conn.createStatement();
  System.out.println("statement created");  //------> it creates statement
7 = are the credits. Number on table. Length allowed 5.
CS 500 = are the course code. Varchar2 on table. Length allowed 20
Java = Actual course name. Varchar2 on table. Length 30
3 = credits. Number on table. Length 5.
          // Prepare a statement to insert a record
          String sql = "INSERT INTO course VALUES (7 , 'CS 500', 'Java', 3 )"; //-->ok. Tested it manually 
          // Execute the insert statement
        stmt.executeUpdate(sql);  //----> *** java program freezes right here.***
        System.out.println("sql executed");   //--> Checked table. SQL never gets executed.
catch ( SQLException ex ) {   //---> no error messages thrown.
System.err.println(ex.getMessage());
  System.err.println(ex.getErrorCode());
  System.err.println(ex.getSQLState());
}

Answer 1

Nothing looks amiss in the code... How long are you waiting before you manually terminate?
Can you replace the executeUpdate() with execute and change the INSERT to a SELECT? Does that work normally (you should be sure to get at least one row to verify that it is working correctly)? Can you select and update a different table in a different tablespace successfully?
Couple of possibilities (I know this is weak):
1) You have hit a deadlock condition because the table is locked by another or same process.
2) You are running into network problems.
3) Your insert is being queued up in Oracle's transaction manager (if configured).
4) Have you tried both the Oracle thin and Oracle OCI driver? Do they both fail without error?
5) Can you turn off autoupdate and try the insert? Does the executeUpdate() return then?