How to resolve java : not found?

fixit_fiona

I execute the command sudo cassandra -R to start cassandra and I get the following error. getopt: invalid option -- 'R' /usr/sbin/cassandra: 158: exec: java: not found It points to the following line in the cassandra script. else exec $NUMACTL "$JAVA" $JVM_OPTS $cassandra_parms -cp "$CLASSPATH" Is it because the environment variable JAVA is not set? If yes, how to set the variable? The output of echo $JAVA_HOME is blank. This is the output of...

Originally asked by AksTester on Stack Exchange (askubuntu) (CC BY-SA 4.0).

uphilltech

Great question — answering as the UphillTech team:

A simple solution for that is to set JAVA_HOME variable to point to your java installation. The cassandra script should generally autodeetect your java location on PATH , but if it doesn't happen, you can help with setting JAVA_HOME explicitly: export JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-amd64/ Note: you must set JAVA_HOME not JAVA . JAVA variable is used internally by the cassandra launch scripts, but you're not supposed to set it. JAVA is set by this code snippet in cassandra.in.sh : # Use JAVA_HOME if set, otherwise look for java in PATH if [ -n "$JAVA_HOME" ]; then # Why we can't have nice things: Solaris combines x86 and x86_64 # installations in the same tree, using an...

Full answer by Piotr Kolaczkowski: https://askubuntu.stackexchange.com/a/1408793 (CC BY-SA 4.0).

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