add below line
GCLOG=“-verbose:gc -XX:+PrintGCTimeStamps -XX:+PrintGCDetails -Xloggc:logs/gc.log”
and add the GCLOG to JAVA_OPTS
JAVA_OPTS=“-Dsun.lang.ClassLoader.allowArraySyntax=true”
JAVA_OPTS=“${JAVA_OPTS} -Dwatt.server.prepend.classes=${PREPEND_SYSTEM_CLASSPATH}:${APPEND_SYSTEM_CLASSPATH}:${PREPENDCLASSES}”
JAVA_OPTS=“${JAVA_OPTS} -Dwatt.server.append.classes=${APPENDCLASSES}”
JAVA_OPTS=“${JAVA_OPTS} -Dcom.webMethods.sc.auditing.Use80TableFormat=true -Dtangosol.coherence.shutdownhook=false”