Question

Please look at the following code for a MSSQL Server 2005.

Properties File

driver=com.microsoft.sqlserver.jdbc.SQLServerDriver
url=jdbc:sqlserver://127.0.0.1:1433;databaseName=LibMgmtSys
user=sa
password=passwrod

Connection File

public class DBConnection {

    static Properties dbproperties;

    public static Connection getConnection() throws Exception {
        Connection conn = null;
        InputStream dbInputStream = null;
        dbInputStream = DBConnection.class.getResourceAsStream("jdbc.properties");

        try {
            dbproperties.load(dbInputStream);
            Class.forName(dbproperties.getProperty("driver"));
            conn = DriverManager.getConnection(dbproperties.getProperty("url"),
                    dbproperties.getProperty("user"),
                    dbproperties.getProperty("password"));
        } catch (Exception exp) {
            System.out.println("error : " + exp);
        }

        return conn;
    }
}

The above code gives me a NullPointException when I try to do dbproperties.load(dbInputStream). Am I doing something wrong???

Answer 1

You didn’t instantiate dbproperties, so it’s null when you try to dereference it (dbproperties.load(dbInputStream);). Change it to:

    try {
        dbproperties = new Properties();
        dbproperties.load(dbInputStream);