I need help on "snaq.db.ConnectionPoolManager". Thank you very much.

Hi, I am a new coder and need some help on my code.
Here is my sample code. After run some days, i got "ClassDAO::connect - unable to establish connection from the Connection Pool : ". I have multiple tasks run at the some time and they all call the same method sample(). How to fix this problem? Anything i have to add into my code to avoid this error? I am waiting online. Thank you very much.
import java.sql.*;*
import javax.sql.;
import snaq.db.ConnectionPoolManager;
public class ClassDAO {
private Connection conn = null;
public void sample(){
try {
conn = ConnectionPoolManager.getInstance().getConnection(dbName);
conn.setAutoCommit(false);
} catch(Exception ex){
throw new TandemDBException(ex, "DbAccessor::connect - unable to establish connection from the Connection
Pool : " + dbName);
}finally {
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
Below are the error messages:
ClassDAO::sample - unable to establish connection from the Connection Pool : DB
java.sql.SQLException: Read timed out

I checked every process code, they are all invoking the same connect() and disconnect() methods. I have disconnect() method in the catch (Exception e) block. But I will take your suggestion to call disconnect() again in finally{} in each process. Once again, please let me know if i have to call "snaq.db.ConnectionPoolManager.close() in the connect() method ". Thank you.
public void disconnect()
try
     closeSqlStatement();
     conn.close();
catch(SQLException e)
          e.printStackTrace(System.out);
          m_logger.error("Error in disconnect() : " + e.toString());
catch(Exception ex)
          ex.printStackTrace(System.out);
          m_logger.error("Error in disconnect() : " + ex.toString());
}

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