How can I construct a file from a byte array to send the file as an attachment to an email without saving the file or file path to disk?

In Java, I have an array of bytes, usually a file from an external API call.

I need to convert this byte array back to a File and send it as an attachment in an email without creating an actual File or referencing the file path in Disk .

I'm fine with making external API calls and building emails with file attachments. Except for the fact that the file I want to create is saved to disk and then emailed as an attachment.

Tried the usual way of writing to a file using FileOutputStream.

//Convert Byte Array to File
byte[] byteArrayFileObj = someProcess();
File attachmentFile = new File("FileName.abc");
OutputStream os = new FileOutputStream(attachmentFile);
os.write(byteArrayFileObj);
os.close();

//Attach the File as an E-Mail Attachment
MimeMessageHelper helper = new MimeMessageHelper(message, true);
helper.addAttachment(attachmentFile.getName(), attachmentFile);

I need to send an email with a file attached without saving the file to disk. In my case it saves a copy of the file to disk.

Google a lot. However, there is no answer to this. Thanks in advance. !