Caused by: com.mysql.cj.exceptions.WrongArgumentException

java.sql.SQLNonTransientConnectionException: Cannot load connection class because of underlying exception: com.mysql.cj.exceptions.WrongArgumentException: Malformed database URL, failed to parse the connection string near '=false'.
 at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:108)
 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:79)
 at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:131)
 at com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:231)
 at java.sql.DriverManager.getConnection(DriverManager.java:664)
 at java.sql.DriverManager.getConnection(DriverManager.java:247)
 at main.test.TestJDBC.findEmpById(TestJDBC.java:39)
 at main.test.TestJDBC.main(TestJDBC.java:18)
Caused by: com.mysql.cj.exceptions.UnableToConnectException: Cannot load connection class because of underlying exception: com.mysql.cj.exceptions.WrongArgumentException: Malformed database URL, failed to parse the connection string near '=false'.
 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:103)
 ... 5 more
Caused by: com.mysql.cj.exceptions.WrongArgumentException: Malformed database URL, failed to parse the connection string near '=false'.
 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.conf.ConnectionUrlParser.processKeyValuePattern(ConnectionUrlParser.java:524)
 at com.mysql.cj.conf.ConnectionUrlParser.parseQuerySection(ConnectionUrlParser.java:496)
 at com.mysql.cj.conf.ConnectionUrlParser.getProperties(ConnectionUrlParser.java:621)
 at com.mysql.cj.conf.ConnectionUrl.collectProperties(ConnectionUrl.java:302)
 at com.mysql.cj.conf.ConnectionUrl.<init>(ConnectionUrl.java:287)
 at com.mysql.cj.conf.url.SingleConnectionUrl.<init>(SingleConnectionUrl.java:47)
 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.util.Util.handleNewInstance(Util.java:210)
 at com.mysql.cj.util.Util.getInstance(Util.java:185)
 at com.mysql.cj.util.Util.getInstance(Util.java:192)
 at com.mysql.cj.conf.ConnectionUrl.getConnectionUrlInstance(ConnectionUrl.java:189)
 at com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:201)
 ... 4 more

解决方式：

Connection connect = DriverManager.getConnection( 
"jdbc:mysql://localhost:3306/test?useSSL=false","root","root");#加入useSSL=false

比如我的：

String url = "jdbc:mysql://localhost:3306/testDao?serverTimezone=UTC&&useSSL=false";