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I am currently running a Java Spring Boot program that should return a response that includes two Excel files (.xlsx) as ByteArrayOutputStream's in the ServletOutputStream as Content-Disposition: attachment;

However, upon returning that response to chrome, it isn't downloading anything.

The Excel files are generated using the Apache POI and then they're being written to a ByteArrayOutputStream.

Here's my code on the file generation

This questions is about my homework.
This topic is need to use like:

Mostly all things explained by fredoverflow(user 237K Rep.) in his Two answers

• https://stackoverflow.com/a/3109981/11862989
• https://stackoverflow.com/a/11540204/11862989

But while implementing Move constructor and overloaded Move Assignment operator(OMAO)( I am using these short form throughout the question ) I am facing some problem that I will put here.

Also there is another answer by user Greg Hewgill (user with 826K Rep.) https://stackoverflow.com/a/3106136/11862989his
I am Quoting him,

Suppose you have a function that returns a substantial object then an ordinary C++ compiler will create a temporary object for the result of multiply(), call the copy constructor to initialize r, and then destruct the temporary return value. Move semantics in C++0x allow the "move constructor" to be called to initialize r by copying its contents, and then discard the temporary value without having to destruct it.

I will also refer this in question.

okay Now I will start

I am trying to extract data (tables) from pdf files and store them as data frames.