狗！The server time zone value 'PDT' is unrecognized or represents more than one time zone.

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错误原因：Mysql时区上的时间与Linux时间不对等。

Sat Apr 20 18:06:40 CST 2019 WARN: Establishing SSL connection without server's identity verification is not recommended. According to MySQL 5.5.45+, 5.6.26+ and 5.7.6+ requirements SSL connection must be established by default if explicit option isn't set. For compliance with existing applications not using SSL the verifyServerCertificate property is set to 'false'. You need either to explicitly disable SSL by setting useSSL=false, or set useSSL=true and provide truststore for server certificate verification.
java.sql.SQLException: The server time zone value 'PDT' is unrecognized or represents more than one time zone. You must configure either the server or JDBC driver (via the serverTimezone configuration property) to use a more specifc time zone value if you want to utilize time zone support.
   at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:127)
   at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:95)
   at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:87)
   at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:61)
   at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:71)
   at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:76)
   at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:862)
   at com.mysql.cj.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:444)
   at com.mysql.cj.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:230)
   at com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:226)
   at java.sql.DriverManager.getConnection(DriverManager.java:664)
   at java.sql.DriverManager.getConnection(DriverManager.java:247)
   at jdbc.jdbc.main(jdbc.java:20)
Caused by: com.mysql.cj.exceptions.InvalidConnectionAttributeException: The server time zone value 'PDT' is unrecognized or represents more than one time zone. You must configure either the server or JDBC driver (via the serverTimezone configuration property) to use a more specifc time zone value if you want to utilize time zone support.
   at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
   at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
   at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
   at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
   at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:59)
   at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:83)
   at com.mysql.cj.util.TimeUtil.getCanonicalTimezone(TimeUtil.java:128)
   at com.mysql.cj.protocol.a.NativeProtocol.configureTimezone(NativeProtocol.java:2201)
   at com.mysql.cj.protocol.a.NativeProtocol.initServerSession(NativeProtocol.java:2225)
   at com.mysql.cj.jdbc.ConnectionImpl.initializePropsFromServer(ConnectionImpl.java:1391)
   at com.mysql.cj.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:993)
   at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:852)
   ... 6 more
Exception in thread "main" java.lang.NullPointerException
   at jdbc.jdbc.main(jdbc.java:29)