java_home is not read by hadoop

Question

I installed java8 with brew install --cask adoptopenjdk/openjdk/adoptopenjdk8 but i think i messed things up,

when i type echo $JAVA_HOME it gives /usr/bin/java

when i type java -version it gives java version "1.8.0_311" Java(TM) SE Runtime Environment (build 1.8.0_311-b11) Java HotSpot(TM) 64-Bit Server VM (build 25.311-b11, mixed mode)

when i type /usr/libexec/java_home it gives /Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home

when i try to run hadoop everything starts except namenode.

when i type namenode -format after start-all.sh it gives this error:

ERROR: JAVA_HOME /usr/local/opt/openjdk does not exist.

My hadoop-env.sh in /etc/hadoop/

score 0 · Accepted Answer · answered Dec 12 '21 at 20:21

0

ensure you JAVA_HOME is set in /etc/hadoop/conf/hadoop-env.sh.

in you ~/.bash_profile add the following:

export JAVA_HOME=$<your java install path>

check this post on actual install path of Java when using brew: java's path still /usr/bin/java after brew cask install java

do this in hadoop-env.sh :

JAVA_HOME=<your java install path>
export JAVA_HOME

answered Dec 12 '21 at 20:21

AppleCiderGuy

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can also refer to this post for further insight: https://stackoverflow.com/questions/14325594/working-with-hadoop-localhost-error-java-home-is-not-set – AppleCiderGuy Dec 12 '21 at 20:22
It is already set in hadoop-en.sh – nada zayed Dec 12 '21 at 21:30
did you export JAVA_HOME in `bash_profile` ? – AppleCiderGuy Dec 12 '21 at 21:45
yes i did and then executed source ~/.bash_profile – nada zayed Dec 12 '21 at 22:37
@nadazayed On macOS, it should be `~/.profile`, since the default shell can be ZSH – OneCricketeer Dec 13 '21 at 22:56
to check your default shell: go to `Terminal > preference > profiles > shell` and check `run command` field – AppleCiderGuy Dec 14 '21 at 23:40
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@OneCricketeer Thank you so much it worked. – nada zayed Dec 15 '21 at 17:30

java_home is not read by hadoop

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