$ grep -i java_home /etc/init.d/tomcat7

$ grep -i java_home /etc/init.d/tomcat7
# The first existing directory is used for JAVA_HOME (if JAVA_HOME is not
    if [ -r "$jdir/bin/java" -a -z "${JAVA_HOME}" ]; then
	JAVA_HOME="$jdir"
export JAVA_HOME
if [ -z "${JSSE_HOME}" -a -r "${JAVA_HOME}/jre/lib/jsse.jar" ]; then
    JSSE_HOME="${JAVA_HOME}/jre/"
	TOMCAT_SH="set -a; JAVA_HOME=\"$JAVA_HOME\"; source \"$DEFAULT\"; \
	if [ -z "$JAVA_HOME" ]; then
		log_failure_msg "no JDK or JRE found - please set JAVA_HOME"
		--user $TOMCAT7_USER --exec "$JAVA_HOME/bin/java" \
			--user $TOMCAT7_USER --exec "$JAVA_HOME/bin/java" \
		--user $TOMCAT7_USER --exec "$JAVA_HOME/bin/java" \
		--user $TOMCAT7_USER --exec "$JAVA_HOME/bin/java" \