Scala repl throws error
Solution 1:
Either update to a newer scala version (2.10.3+) or downgrade java to java 6/7. As you have seen in the output, 2.9.2 was here long before java 8 was introduced (Copyright 2002-2011, LAMP/EPFL), so they don't work well together.
This duplicate question contains exact instructions on ubuntu's java downgrade.
Solution 2:
remove the scala 2.9.2 using terminal
sudo apt-get remove scala
download the latest scala from scala website
Installation instruction are giving on this link
Solution 3:
You might have to run it with JDK 7 or 6