Logstash -Could not find any executable java binary
I had to
export JAVACMD=`which java`
to make this work.
I know, it's an old thread, but I was also having the same problem and was doing a very silly thing.
I had updated my $JAVA_HOME var in /etc/environment but was not reloading the file because of which it was not taking effect, and running source /etc/environment solved my problem.