JAVA_HOME error

$echo $JAVA_HOME
/usr/lib/jvm/java-1.7.0-openjdk-amd64

The error I get:
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10.0.1.193: Error: JAVA_HOME is not set and could not be found.
10.0.1.190: Error: JAVA_HOME is not set and could not be found.
10.0.1.191: Error: JAVA_HOME is not set and could not be found.
10.0.1.192: Error: JAVA_HOME is not set and could not be found.
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What exists in hadoop-config.sh:

# Attempt to set JAVA_HOME if it is not set
if [[ -z $JAVA_HOME ]]; then
  # On OSX use java_home (or /Library for older versions)
  if [ "Darwin" == "$(uname -s)" ]; then
    if [ -x /usr/libexec/java_home ]; then
      export JAVA_HOME=($(/usr/libexec/java_home))
    else
      export JAVA_HOME=(/Library/Java/Home)
    fi
  fi

  # Bail if we did not detect it
  if [[ -z $JAVA_HOME ]]; then
    echo "Error: JAVA_HOME is not set and could not be found." 1>&2
    exit 1
  fi
fi