Wrong java version. 1.8 or 9 is required

If you are getting below error while running cts-tradefed or vts-tradefedor gts-tradefed .
Use below steps to resole this error:

1)Check java --version
It gave below output:
java --version
java 12.0.1 2019-04-16
Java(TM) SE Runtime Environment (build 12.0.1+12)
Java HotSpot(TM) 64-Bit Server VM (build 12.0.1+12, mixed mode, sharing)

2)Open cts-tradefed or vts-tradefedor gts-tradefed and edit as below:
change below line 
JAVA_VERSION=$(java -version 2>&1 | head -n 1 | grep 'version [ "]\(1\.8\|9\).*[ "]')
to this
# check java version
JAVA_VERSION=$(java -version 2>&1 | head -n 1 | grep 'version [ "]\(12\.0\.1\|9\).*[ "]')

3)Now try to execute ./cts-tradefed it should execute without any error.

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