Even though you have changed the JAVA_HOME variable in linux to chanhge the current java version in linux, java -version command will out put a version which you are not expecting. This may cause system has been installed several java versions.
As a solution for that you can change both JAVA_HOME and update-alternatives.
1) Change the JAVA_HOME variable as usual. (echo $JAVA_HOME to ensure)
2) Then type sudo update-alternatives --config java and follow the provided instructions.
3) Now java -version command should output the expected correct version of the java.
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