Java load properties file java.lang.NullPointerException error

Question

I have one properties file, name is XYZ.properties. I want to get details from this file. My property file location is D:\properties_file\XYZ.properties

For this i am using below code

import java.io.InputStream;
import java.util.Properties;

public class LoadProp {
    private static Properties prop = new Properties();
    public static Properties getProperties() throws Exception {
        if (prop.isEmpty()) {
            InputStream fis = LoadProp.class.getResourceAsStream("D:\\properties_file\\XYZ.properties");
            prop.load(fis);
        }
        return prop;
    }
}

public class demo extends HttpServlet {
    private static final long serialVersionUID = 1L;
    private static Properties propFile;

    public void doPost(HttpServletRequest request, HttpServletResponse response) {
        try {
            propFile = LoadProp.getProperties();
            System.out.println(propFile.getProperty(Constants.URL));
        }
        catch (ServletException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (Exception e1) {
            e1.printStackTrace();
        }
    }
}

But when i run this on prop.load(fis) line it gives me the following error

java.lang.NullPointerException

Resources are not files, do not reside in the file system, do not have backslashes as directory separators, and do not have drive letters as part of their names. — user207421, Oct 19 '16 at 11:29

Krzysztof Cichocki · Accepted Answer · 2016-10-19T11:36:12.383

2

Change this line:

InputStream fis = LoadProp.class.getResourceAsStream("D:\\properties_file\\XYZ.properties");

to

InputStream fis = new FileInputStream("D:\\properties_file\\XYZ.properties");

The getResourceAsStream is designed to read a resource from classpath (resource inside your app), in order to read file that is outside the app, use java File API.

edited Oct 19 '16 at 11:36

answered Oct 19 '16 at 11:29

Krzysztof Cichocki

6,294
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score 0 · Answer 2 · answered Oct 19 '16 at 11:29

0

Class.getResourceAsStream does not open a file system location. It tries to find the resource in the class path. You may want to read the properties with a FileInputStream instead.

answered Oct 19 '16 at 11:29

Henry

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Java load properties file java.lang.NullPointerException error

2 Answers2