How to convert FileInputStream to S3ObjectInputStream

Question

I want to convert the File InputStream to S3ObjectInputStream, I tried it in the below way but it did not work out and I am getting

java.io.FileInputStream cannot be cast to com.amazonaws.services.s3.model.S3ObjectInputStream

This is my code

InputStream is = new FileInputStream(file);
S3ObjectInputStream sObject = (S3ObjectInputStream)is;

Answer 1

This is how you can convert inputStream to S3Object inputstream. Make sure you have the mock S3 file present on src/test/resources folder

private S3ObjectInputStream getMockS3Content() {
        InputStream inputStream = Thread.currentThread()
            .getContextClassLoader()
            .getResourceAsStream("mockS3content.json");
        S3ObjectInputStream s3ObjectInputStream = new S3ObjectInputStream(inputStream,null);
        return s3ObjectInputStream;
    }

Answer 2

Use the constructor

new S3ObjectInputStream(InputStream in, ...

I used aws-java-sdk version 1.11.526

Answer 3

You need cast as a InputStream

InputStream is = new FileInputStream(file);
S3ObjectInputStream sObject = (InputStream) is;

Hope it helps