Error on Try statement

Question

I receive a message 'Illegal start of type' on the first Try statement when compiling the following code. I'd appreciate any ideas on why this error occurs.
import java.util.*;
import java.sql.*;
import java.io.*;
import java.lang.*;
public class VPAsql {   
String fieldValue;
Connection connection = null;
VPAsql() {
//public static void main(String args[]) {
try {   
String driverName = "COM.ibm.db2.jdbc.app.DB2Driver";
Class.forName(driverName);
String url = "jdbc:db2:SAMPLE";
String username = "db2admin";
String password = "password";
connection = DriverManager.getConnection(url, username,
password);
} catch (ClassNotFoundException e) {
System.err.println("Driver not found");
} catch (SQLException e) {
System.err.println("Could not connect");
System.err.println(connection);
insertSampleTable(String passedFieldValue){
this.fieldValue = passedFieldvalue;
try {
Statement stmt = connection.createStatement();
String sql = "INSERT INTO SAMPLE.PNVPA(PONUMBER) VALUES
(passedFieldvalue)";
stmt.executeUpdate(sql);
} catch (SQLException e) {
}

Answer 1

Uncomment the main method (or put another method with right signature there)