Error Registered the JDBC driver [oracle.jdbc.driver.Oracledriver] but failed to unregister

Question

I’m making a system Javaweb using jsp that’s on that topic: Doubt in database query, error in query, and in a database query, I came across a driver error that is just below. I use the IDE netbeans server-based glassfish and the Oracle database.

Error:

Warning: The web application [/highway] Registered the JDBC driver [oracle.jdbc.driver.Oracledriver] but failed to unregister it when the web application was stopped. To Prevent a memory Leak, the JDBC Driver has been forcibly unregistered.

Connection class:

public class Conexao {

private Connection conexao;

public Conexao() {
    try {
        Class.forName("oracle.jdbc.driver.OracleDriver").newInstance();
        String url = "jdbc:oracle:thin:@127.0.0.1:1521:XE";
        conexao = DriverManager.getConnection(url,"rafilds","1234");
  } catch (Exception e) {
        e.printStackTrace();
    }
}

public Connection getConexao() {
    return conexao;
}
}

Answer 1

Problem solved, this was no error as stated by Pedro, it is a Warning, and the problem was in the database Insert.