Dec 06, 2017 10:59:49 PM com.mongodb.ConnectionStatus$UpdatableNode update
WARNING: Server seen down: /:27017 - java.io.IOException - message: couldn't connect to [/17017] bc:java.net.SocketTimeoutException: connect timed out
Dec 06, 2017 11:00:14 PM org.apache.coyote.http11.AbstractHttp11Processor process
INFO: Error parsing HTTP request header
Note: further occurrences of HTTP header parsing errors will be logged at DEBUG level.
Dec 06, 2017 11:00:29 PM com.mongodb.ConnectionStatus$UpdatableNode update
WARNING: Server seen down: /:27017 - java.io.IOException - message: couldn't connect to [/1027017] bc:java.net.SocketTimeoutException: connect timed out
Dec 06, 2017 11:00:49 PM com.mongodb.ConnectionStatus$UpdatableNode update
WARNING: Server seen down: /17 - java.io.IOException - message: couldn't connect to [/117] bc:java.net.SocketTimeoutException: connect timed out
Dec 06, 2017 11:01:09 PM com.mongodb.ConnectionStatus$UpdatableNode update
WARNING: Server seen down: /017 - java.io.IOException - message: couldn't connect to [/10.117] bc:java.net.SocketTimeoutException: connect timed out
Dec 06, 2017 11:01:50 PM com.mongodb.ConnectionStatus$UpdatableNode update
WARNING: Server seen down: /10017 - java.io.IOException - message: couldn't connect to [/10.117] bc:java.net.SocketTimeoutException: connect timed out
Dec 06, 2017 11:02:10 PM com.mongodb.ConnectionStatus$UpdatableNode update
WARNING: Server seen down: /10.7017 - java.io.IOException - message: couldn't connect to [/10.017] bc:java.net.SocketTimeoutException: connect timed out
Dec 06, 2017 11:02:50 PM com.mongodb.ConnectionStatus$UpdatableNode update
WARNING: Server seen down: /10.15017 - java.io.IOException - message: couldn't connect to [/10.159.17] bc:java.net.SocketTimeoutException: connect timed out
Dec 06, 2017 11:03:06 PM org.apache.coyote.AbstractProtocol pause
INFO: Pausing ProtocolHandler ["ht60"]
Dec 06, 2017 11:03:07 PM org.apache.coyote.AbstractProtocol pause
INFO: Pausing ProtocolHandler ["09"]
Dec 06, 2017 11:03:07 PM org.apache.catalina.core.StandardService stopInternal
INFO: Stopping service Catalina
Dec 06, 2017 11:03:07 PM org.apache.catalina.loader.WebappClassLoader clearReferencesJdbc
SEVERE: The web application [/gochan] registered the JDBC driver [com.mysql.jdbc.Driver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered.
Dec 06, 2017 11:03:07 PM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
SEVERE: The web application [/gan] appears to have started a thread named [Timer-0] but has failed to stop it. This is very likely to create a memory leak.
Dec 06, 2017 11:03:07 PM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
SEVERE: The web application [/ghan] appears to have started a thread named [pool-1-thread-1] but has failed to stop it. This is very likely to create a memory leak.
Dec 06, 2017 11:03:07 PM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
SEVERE: The web application [/guaochan] appears to have started a thread named [MySQL Statement Cancellation Timer] but has failed to stop it. This is very likely to create a memory leak.
Dec 06, 2017 11:03:07 PM org.apache.coyote.AbstractProtocol stop
INFO: Stopping ProtocolHandler ["htt0"]
Dec 06, 2017 11:03:07 PM org.apache.coyote.AbstractProtocol stop
INFO: Stopping ProtocolHandler ["ajp09"]
Dec 06, 2017 11:03:07 PM org.apache.coyote.AbstractProtocol destroy
INFO: Destroying ProtocolHandler ["h0"]
Dec 06, 2017 11:03:07 PM org.apache.coyote.AbstractProtocol destroy
INFO: Destroying ProtocolHandler ["a09"]
可能断网了吧……
把当前连接数据库的进程杀死，重启
java.io.IOException - message: couldn't connect to [/17017] bc:java.net.SocketTimeoutException: connect timed out
看报错信息是连接超时，不能连接 [/17017]；你是不是修改了某些参数信息，导致连接失败
连接超时了，阿里云也可能网络有延迟，建议你最好服务器和数据库放在同一台主机上。