Caused by: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException:

错误提示

Last packet sent to the server was 2 ms ago.
		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.jdbc.Util.handleNewInstance(Util.java:406)
		at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1074)
		at com.mysql.jdbc.ExportControlled.transformSocketToSSLSocket(ExportControlled.java:104)
		at com.mysql.jdbc.MysqlIO.negotiateSSLConnection(MysqlIO.java:4472)
		at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1319)
		at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2031)
		... 12 more
	Caused by: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
		at sun.security.ssl.Alerts.getSSLException(Alerts.java:192)
		at sun.security.ssl.SSLSocketImpl.fatal(SSLSocketImpl.java:1959)
		at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:302)
		at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:296)
		at sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1514)
		at sun.security.ssl.ClientHandshaker.processMessage(ClientHandshaker.java:216)
		at sun.security.ssl.Handshaker.processLoop(Handshaker.java:1026)
		at sun.security.ssl.Handshaker.process_record(Handshaker.java:961)
		at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:1072)
		at sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1385)
		at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1413)
		at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1397)
		at com.mysql.jdbc.ExportControlled.transformSocketToSSLSocket(ExportControlled.java:89)
		... 15 more

错误原因：导入数据库的jar包与数据库版本不一致

解决：我的数据库是8.0的，把jar包5.1.6改为8.0.22即可

  mysql
  mysql-connector-java
  5.1.6

  mysql
  mysql-connector-java
  8.0.22