tomcat startup.sh提示java.lang.OutOfMemoryError: PermGen space

JAVA_OPTS="-server -XX:PermSize=512M -XX:MaxPermSize=1024m"
if [ -z "$LOGGING_MANAGER" ]; then
JAVA_OPTS="$JAVA_OPTS -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager"
else
JAVA_OPTS="$JAVA_OPTS $LOGGING_MANAGER"
fi