问题：
java.sql.SQLException: The server time zone value '�й���ʱ��' 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:129) ~[mysql-connector-java-8.0.21.jar:8.0.21]
at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:97) ~[mysql-connector-java-8.0.21.jar:8.0.21]
at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:89) ~[mysql-connector-java-8.0.21.jar:8.0.21]
at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:63) ~[mysql-connector-java-8.0.21.jar:8.0.21]
at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:73) ~[mysql-connector-java-8.0.21.jar:8.0.21]
at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:76) ~[mysql-connector-java-8.0.21.jar:8.0.21]
at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:836) ~[mysql-connector-java-8.0.21.jar:8.0.21]
at com.mysql.cj.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:456) ~[mysql-connector-java-8.0.21.jar:8.0.21]
at com.mysql.cj.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:246) ~[mysql-connector-java-8.0.21.jar:8.0.21]
at com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:197) ~[mysql-connector-java-8.0.21.jar:8.0.21]
at com.zaxxer.hikari.util.DriverDataSource.getConnection(DriverDataSource.java:138) ~[HikariCP-3.4.5.jar:na]
at com.zaxxer.hikari.pool.PoolBase.newConnection(PoolBase.java:358) ~[HikariCP-3.4.5.jar:na]
at com.zaxxer.hikari.pool.PoolBase.newPoolEntry(PoolBase.java:206) ~[HikariCP-3.4.5.jar:na]
at com.zaxxer.hikari.pool.HikariPool.createPoolEntry(HikariPool.java:477) [HikariCP-3.4.5.jar:na]
at com.zaxxer.hikari.pool.HikariPool.checkFailFast(HikariPool.java:560) [HikariCP-3.4.5.jar:na]
at com.zaxxer.hikari.pool.HikariPool.<init>(HikariPool.java:115) [HikariCP-3.4.5.jar:na]
at com.zaxxer.hikari.HikariDataSource.getConnection(HikariDataSource.java:112) [HikariCP-3.4.5.jar:na]
at com.security.service.Experiment5ApplicationTests.contextLoads(Experiment5ApplicationTests.java:25) [test-classes/:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0]
at java.lang.reflect.Method.invoke(Method.java:483) ~[na:1.8.0]
at org.junit.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:686) [junit-platform-commons-1.6.2.jar:1.6.2]
at org.junit.jupiter.engine.execution.MethodInvocation.proceed(MethodInvocation.java:60) [junit-jupiter-engine-5.6.2.jar:5.6.2]
at org.junit.jupiter.engine.execution.InvocationInterceptorChain$ValidatingInvocation.proceed(InvocationInterceptorChain.java:131) [junit-jupiter-engine-5.6.2.jar:5.6.2]
at org.junit.jupiter.engine.extension.TimeoutExtension.intercept(TimeoutExtension.java:149) [junit-jupiter-engine-5.6.2.jar:5.6.2]
at org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestableMethod(TimeoutExtension.java:140) [junit-jupiter-engine-5.6.2.jar:5.6.2]
at org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestMethod(TimeoutExtension.java:84) [junit-jupiter-engine-5.6.2.jar:5.6.2]
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor$$Lambda$151/1268959798.apply(Unknown Source) [junit-jupiter-engine-5.6.2.jar:5.6.2]
at org.junit.jupiter.engine.execution.ExecutableInvoker$ReflectiveInterceptorCall.lambda$ofVoidMethod$0(ExecutableInvoker.java:115) [junit-jupiter-engine-5.6.2.jar:5.6.2]
at org.junit.jupiter.engine.execution.ExecutableInvoker$ReflectiveInterceptorCall$$Lambda$152/928466577.apply(Unknown Source) [junit-jupiter-engine-5.6.2.jar:5.6.2]
at org.junit.jupiter.engine.execution.ExecutableInvoker.lambda$invoke$0(ExecutableInvoker.java:105) [junit-jupiter-engine-5.6.2.jar:5.6.2]
at org.junit.jupiter.engine.execution.ExecutableInvoker$$Lambda$376/2059572982.apply(Unknown Source) [junit-jupiter-engine-5.6.2.jar:5.6.2]
at org.junit.jupiter.engine.execution.InvocationInterceptorChain$InterceptedInvocation.proceed(InvocationInterceptorChain.java:106) [junit-jupiter-engine-5.6.2.jar:5.6.2]
at org.junit.jupiter.engine.execution.InvocationInterceptorChain.proceed(InvocationInterceptorChain.java:64) [junit-jupiter-engine-5.6.2.jar:5.6.2]
at org.junit.jupiter.engine.execution.InvocationInterceptorChain.chainAndInvoke(InvocationInterceptorChain.java:45) [junit-jupiter-engine-5.6.2.jar:5.6.2]
at org.junit.jupiter.engine.execution.InvocationInterceptorChain.invoke(InvocationInterceptorChain.java:37) [junit-jupiter-engine-5.6.2.jar:5.6.2]
at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:104) [junit-jupiter-engine-5.6.2.jar:5.6.2]
at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:98) [junit-jupiter-engine-5.6.2.jar:5.6.2]
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeTestMethod$6(TestMethodTestDescriptor.java:212) [junit-jupiter-engine-5.6.2.jar:5.6.2]
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor$$Lambda$810/2084041029.execute(Unknown Source) [junit-jupiter-engine-5.6.2.jar:5.6.2]
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) [junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeTestMethod(TestMethodTestDescriptor.java:208) [junit-jupiter-engine-5.6.2.jar:5.6.2]
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:137) [junit-jupiter-engine-5.6.2.jar:5.6.2]
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:71) [junit-jupiter-engine-5.6.2.jar:5.6.2]
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:135) [junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.NodeTestTask$$Lambda$248/1907431275.execute(Unknown Source) [junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) [junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:125) [junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.NodeTestTask$$Lambda$247/1383524016.invoke(Unknown Source) [junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:135) [junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:123) [junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.NodeTestTask$$Lambda$246/373182087.execute(Unknown Source) [junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) [junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:122) [junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:80) [junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService$$Lambda$252/1374026904.accept(Unknown Source) [junit-platform-engine-1.6.2.jar:1.6.2]
at java.util.ArrayList.forEach(ArrayList.java:1234) [na:1.8.0]
at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38) [junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:139) [junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.NodeTestTask$$Lambda$248/1907431275.execute(Unknown Source) [junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) [junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:125) [junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.NodeTestTask$$Lambda$247/1383524016.invoke(Unknown Source) [junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:135) [junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:123) [junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.NodeTestTask$$Lambda$246/373182087.execute(Unknown Source) [junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) [junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:122) [junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:80) [junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService$$Lambda$252/1374026904.accept(Unknown Source) [junit-platform-engine-1.6.2.jar:1.6.2]
at java.util.ArrayList.forEach(ArrayList.java:1234) [na:1.8.0]
at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38) [junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:139) [junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.NodeTestTask$$Lambda$248/1907431275.execute(Unknown Source) [junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) [junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:125) [junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.NodeTestTask$$Lambda$247/1383524016.invoke(Unknown Source) [junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:135) [junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:123) [junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.NodeTestTask$$Lambda$246/373182087.execute(Unknown Source) [junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) [junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:122) [junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:80) [junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.submit(SameThreadHierarchicalTestExecutorService.java:32) [junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:57) [junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:51) [junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:248) [junit-platform-launcher-1.6.2.jar:1.6.2]
at org.junit.platform.launcher.core.DefaultLauncher.lambda$execute$5(DefaultLauncher.java:211) [junit-platform-launcher-1.6.2.jar:1.6.2]
at org.junit.platform.launcher.core.DefaultLauncher$$Lambda$181/1514840818.accept(Unknown Source) [junit-platform-launcher-1.6.2.jar:1.6.2]
at org.junit.platform.launcher.core.DefaultLauncher.withInterceptedStreams(DefaultLauncher.java:226) [junit-platform-launcher-1.6.2.jar:1.6.2]
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:199) [junit-platform-launcher-1.6.2.jar:1.6.2]
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:132) [junit-platform-launcher-1.6.2.jar:1.6.2]
at com.intellij.junit5.JUnit5IdeaTestRunner.startRunnerWithArgs(JUnit5IdeaTestRunner.java:69) [junit5-rt.jar:na]
at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33) [junit-rt.jar:na]
at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:230) [junit-rt.jar:na]
at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:58) [junit-rt.jar:na]
Caused by: com.mysql.cj.exceptions.InvalidConnectionAttributeException: The server time zone value '�й���ʱ��' 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) ~[na:1.8.0]
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[na:1.8.0]
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:1.8.0]
at java.lang.reflect.Constructor.newInstance(Constructor.java:408) ~[na:1.8.0]
at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:61) ~[mysql-connector-java-8.0.21.jar:8.0.21]
at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:85) ~[mysql-connector-java-8.0.21.jar:8.0.21]
at com.mysql.cj.util.TimeUtil.getCanonicalTimezone(TimeUtil.java:132) ~[mysql-connector-java-8.0.21.jar:8.0.21]
at com.mysql.cj.protocol.a.NativeProtocol.configureTimezone(NativeProtocol.java:2120) ~[mysql-connector-java-8.0.21.jar:8.0.21]
at com.mysql.cj.protocol.a.NativeProtocol.initServerSession(NativeProtocol.java:2143) ~[mysql-connector-java-8.0.21.jar:8.0.21]
at com.mysql.cj.jdbc.ConnectionImpl.initializePropsFromServer(ConnectionImpl.java:1310) ~[mysql-connector-java-8.0.21.jar:8.0.21]
at com.mysql.cj.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:967) ~[mysql-connector-java-8.0.21.jar:8.0.21]
at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:826) ~[mysql-connector-java-8.0.21.jar:8.0.21]
... 90 common frames omitted
原因：
使用了Mysql Connector/J 6.x以上的版本，然后就报了时区的错误
解决办法：
在jdbc后拼接serverTimezone=UTC
例：
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/security?characterEncoding=UTF-8&serverTimezone=UTC
spring.datasource.username=root
spring.datasource.password=root