Properties File Loading Using Static Code in Class

Question

I have a 'PropertiesUtil' class for reading properties from a configuration file. The code of the class is given below:

public class PropertiesUtil {

  public static Properties prop;
  public static String databaseConnectivityString;
  public static String databaseUserName;
  public static String databaseUserPassword;

  static {
      try {
          prop.load(new FileReader(new File("config.prop")));
          databaseConnectivityString = prop.getProperty("databaseConnectivityString");
          databaseUserName = prop.getProperty("databaseUserName");
          databaseUserPassword = prop.getProperty("databaseUserPassword");
      } catch (IOException | NumberFormatException ex) {
          LoggerUtil.getLogger().severe("Problem loading or Reading Configuration file");
      }
  }
}

when I call the following code from another class 'Test' with a main method I get a NullPointerException. The code of the 'Test' Class is given below. Kindly help me troubleshoot.

public class Test {
  public static void main(String... args) throws IOException {
      System.out.println(PropertiesUtil.databaseUserName);
  }
}

check congig.pop is available in current class path or not ..then match the properties key with property name that you provided in your code — loknath
– loknath, Commented Mar 26, 2014 at 18:31

Sotirios Delimanolis · Accepted Answer · 2014-03-26 18:24:09Z

4

Initialize your field right away.

public static Properties prop = new Properties();

otherwise the field remains null and dereferencing it

prop.load(new FileReader(new File("config.prop")));

causes a NullPointerException.

answered Mar 26, 2014 at 18:24

Sotirios Delimanolis

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