Logstash restsart and no error logs

I have install the logstash with the rpm package, the version is 6.0, and the vm is 2c 2g, the jdk version is 1.8.0(yum install), when I start the logstash service, it always restart , and no error log in the /var/log/message and the journalctl -u logstash logs, please help me to solve this problem, thanks. The logstash's log of message file is that :Sep 16 23:17:20 localhost.localdomain systemd[1]: Started logstash.
Sep 16 23:17:30 localhost.localdomain logstash[5740]: Sending Logstash's logs to /var/log/logstash which is now configured via log4j2.properties
Sep 16 23:17:30 localhost.localdomain systemd[1]: logstash.service: main process exited, code=exited, status=1/FAILURE
Sep 16 23:17:30 localhost.localdomain systemd[1]: Unit logstash.service entered failed state.
Sep 16 23:17:30 localhost.localdomain systemd[1]: logstash.service failed.
Sep 16 23:17:30 localhost.localdomain systemd[1]: logstash.service holdoff time over, scheduling restart.
Sep 16 23:17:30 localhost.localdomain systemd[1]: Stopped logstash.
Sep 16 23:17:30 localhost.localdomain systemd[1]: Started logstash.

6.0 is EOL, can you upgrade?