Tukukkk

I built a jar file with maven. I am using the following code in the only class in the jar file to try to access the config file.

 InputStream is = Myclass.class.getClassLoader().getResourceAsStream("/config.properties");

The config.properties file is in the jar file located at Path /

I don't see any error messages. But when I try to access the values in the Properties object, the values are null.

 Properties prop = new Properties();

 prop.load(is);

 serverUrl=prop.getProperty("serverUrl");

serverUrl is null.

Any suggestions on how to get the values in the config file in the jar file?

Typically in maven, you locate resources under src/main/resources.

Then you can access these resources by using the classloader:

try (InputStream in = Myclass.class.getClassLoader().getResourceAsStream("config.properties") {

    //doSomething

}

I was facing same issue before I realized that the following way is only good for loading files in your classpath.

InputStream is = Myclass.class.getClassLoader().getResourceAsStream("/config.properties");

For picking files regardless of whether they are in classpath or not, I use Apache FileUtils. For e.g I used following and it worked like a charm.

String str = FileUtils.readFileToString(new File(path_to_your_file), "UTF-8");

IOUtils.toInputStream(str, "UTF-8"); // if you need InputStream object

You can have a look at other APIs provided by FileUtils too other than readFileToString

getResourceAsStream("config.properties") - this method will only work if your properties file is in the classpath. I think you have added the properties file outside the classpath. This method is basically used for accessing a file present in the classpath.

Please check it again.

Thanks :)

Working Code :

public class MyClass {



    public static void main(String args) throws Exception {

        Properties prop = new Properties();

        InputStream input = null;



        try {



            String filename = "config.properties";

            input = MyClass.class.getClassLoader().getResourceAsStream(filename);

            if (input == null) {

                System.out.println("Sorry, unable to find " + filename);

                return;

            }



            // load a properties file from class path, inside static method

            prop.load(input);



            // get the property value and print it out

            System.out.println(prop.getProperty("serverUrl"));



        } catch (IOException ex) {

            ex.printStackTrace();

        } finally {

            if (input != null) {

                try {

                    input.close();

                } catch (IOException e) {

                    e.printStackTrace();

                }

            }

        }



    }



}