java.io.IOException: invalid identifier
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When you iterate over the lines of a scala.io.Source with source.getLines, make sure you do not close the source until you processed the iterator.
This occurs when the file is being locked by another application. Check if another process is accessing the same file. On Windows follow this post to figure it out : https://goo.gl/yPp1To
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java.io.IOException: invalid identifier
at java.io.FileInputStream.readBytes(Native Method)
at java.io.FileInputStream.read(FileInputStream.java:191)
at java.io.BufferedInputStream.read1(BufferedInputStream.java:220)
at java.io.BufferedInputStream.read(BufferedInputStream.java:277)
at sun.nio.cs.StreamDecoder$CharsetSD.readBytes(StreamDecoder.java:406)
at sun.nio.cs.StreamDecoder$CharsetSD.implRead(StreamDecoder.java:446)
at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:180)
at java.io.InputStreamReader.read(InputStreamReader.java:167)
at java.io.BufferedReader.fill(BufferedReader.java:136)
at java.io.BufferedReader.readLine(BufferedReader.java:299)
at java.io.BufferedReader.readLine(BufferedReader.java:362)
at aritmetica.Stub.getOperationRequested(Stub.java:100)
at aritmetica.Stub.go(Stub.java:66)
at aritmetica.Stub.main(Stub.java:33)