Java Exception Thrown When Making New Line

[Former user]

Hello, I encountered a Java error in when testing this code:

local newCode = "abc/n123"
local editFile = "testy"
----------------------------
local f = fs.open(editFile, "r")--Retrieves files code. I used 'testy' to test.
local oldFile = f.readAll()
f.close()
local f = fs.open(editFile, "w")--Writes over old code.
f.writeLine(newCode)
f.write(oldFile)
f.close()
----------------------------

More information is here. I think it happens when making a new line with /n.

[Thomas Farr]

I've tested that code and got no errors, If you're able to replicate the error, could you post either the output from the command line when the exception occurs.

[Former user]

I did some testing and it seemed to work fine this time. Not sure why it didn't work when trying to recreate it.