我对Wildfly/JBoss完全陌生，所以我不知道该怎么做，我从昨天中午就一直坐在这个问题上。 我尝试使用mysql-connector-java-8.0.20.jar作为连接器，我的Wildfly版本是Wildfly-19.0.0.final。 因此，服务器上的部署似乎工作得很好，但每当我尝试添加数据源并测试连接时，都会遇到以下错误:

"WFLYJCA0040: failed to invoke operation: WFLYJCA0047: Connection is not valid"

日志/服务器引发:

2020-06-19 12:47:04,231 INFO  [org.jboss.as.connector.subsystems.datasources] (MSC service thread 1-7) WFLYJCA0001: Bound data source [java:jboss/datasources/MySqlDS]
2020-06-19 12:47:04,353 WARN  [org.jboss.jca.core.connectionmanager.pool.strategy.OnePool] (External Management Request Threads -- 1) IJ000604: Throwable while attempting to get a new connection: null: javax.resource.ResourceException: IJ031084: Unable to create connection
    at org.jboss.ironjacamar.jdbcadapters@1.4.20.Final//org.jboss.jca.adapters.jdbc.local.LocalManagedConnectionFactory.createLocalManagedConnection(LocalManagedConnectionFactory.java:345)
    at org.jboss.ironjacamar.jdbcadapters@1.4.20.Final//org.jboss.jca.adapters.jdbc.local.LocalManagedConnectionFactory.getLocalManagedConnection(LocalManagedConnectionFactory.java:352)
    at org.jboss.ironjacamar.jdbcadapters@1.4.20.Final//org.jboss.jca.adapters.jdbc.local.LocalManagedConnectionFactory.createManagedConnection(LocalManagedConnectionFactory.java:287)
    at org.jboss.ironjacamar.impl@1.4.20.Final//org.jboss.jca.core.connectionmanager.pool.mcp.SemaphoreConcurrentLinkedDequeManagedConnectionPool.createConnectionEventListener(SemaphoreConcurrentLinkedDequeManagedConnectionPool.java:1326)
    at org.jboss.ironjacamar.impl@1.4.20.Final//org.jboss.jca.core.connectionmanager.pool.mcp.SemaphoreConcurrentLinkedDequeManagedConnectionPool.getConnection(SemaphoreConcurrentLinkedDequeManagedConnectionPool.java:499)
    at org.jboss.ironjacamar.impl@1.4.20.Final//org.jboss.jca.core.connectionmanager.pool.AbstractPool.internalTestConnection(AbstractPool.java:1067)
    at org.jboss.ironjacamar.impl@1.4.20.Final//org.jboss.jca.core.connectionmanager.pool.strategy.OnePool.testConnection(OnePool.java:93)
    at org.jboss.as.connector@19.0.0.Final//org.jboss.as.connector.subsystems.common.pool.PoolOperations$TestConnectionInPool.invokeCommandOn(PoolOperations.java:240)
    at org.jboss.as.connector@19.0.0.Final//org.jboss.as.connector.subsystems.common.pool.PoolOperations$1.execute(PoolOperations.java:97)
    at org.jboss.as.controller@11.0.0.Final//org.jboss.as.controller.AbstractOperationContext.executeStep(AbstractOperationContext.java:999)
    at org.jboss.as.controller@11.0.0.Final//org.jboss.as.controller.AbstractOperationContext.processStages(AbstractOperationContext.java:743)
    at org.jboss.as.controller@11.0.0.Final//org.jboss.as.controller.AbstractOperationContext.executeOperation(AbstractOperationContext.java:467)
    at org.jboss.as.controller@11.0.0.Final//org.jboss.as.controller.OperationContextImpl.executeOperation(OperationContextImpl.java:1413)
    at org.jboss.as.controller@11.0.0.Final//org.jboss.as.controller.ModelControllerImpl.internalExecute(ModelControllerImpl.java:429)
    at org.jboss.as.controller@11.0.0.Final//org.jboss.as.controller.ModelControllerImpl.lambda$execute$1(ModelControllerImpl.java:246)
    at org.wildfly.security.elytron-private@1.11.2.Final//org.wildfly.security.auth.server.SecurityIdentity.runAs(SecurityIdentity.java:289)
    at org.wildfly.security.elytron-private@1.11.2.Final//org.wildfly.security.auth.server.SecurityIdentity.runAs(SecurityIdentity.java:255)
    at org.jboss.as.controller@11.0.0.Final//org.jboss.as.controller.ModelControllerImpl.execute(ModelControllerImpl.java:246)
    at org.jboss.as.domain-http-interface@11.0.0.Final//org.jboss.as.domain.http.server.DomainApiHandler.handleRequest(DomainApiHandler.java:212)
    at io.undertow.core@2.0.30.Final//io.undertow.server.handlers.encoding.EncodingHandler.handleRequest(EncodingHandler.java:72)
    at org.jboss.as.domain-http-interface@11.0.0.Final//org.jboss.as.domain.http.server.DomainApiCheckHandler.handleRequest(DomainApiCheckHandler.java:93)
    at org.jboss.as.domain-http-interface@11.0.0.Final//org.jboss.as.domain.http.server.security.ElytronIdentityHandler.lambda$handleRequest$0(ElytronIdentityHandler.java:62)
    at org.wildfly.security.elytron-private@1.11.2.Final//org.wildfly.security.auth.server.SecurityIdentity.runAs(SecurityIdentity.java:313)
    at org.wildfly.security.elytron-private@1.11.2.Final//org.wildfly.security.auth.server.SecurityIdentity.runAs(SecurityIdentity.java:270)
    at org.jboss.as.controller@11.0.0.Final//org.jboss.as.controller.AccessAuditContext.doAs(AccessAuditContext.java:254)
    at org.jboss.as.controller@11.0.0.Final//org.jboss.as.controller.AccessAuditContext.doAs(AccessAuditContext.java:225)
    at org.jboss.as.domain-http-interface@11.0.0.Final//org.jboss.as.domain.http.server.security.ElytronIdentityHandler.handleRequest(ElytronIdentityHandler.java:61)
    at io.undertow.core@2.0.30.Final//io.undertow.server.handlers.BlockingHandler.handleRequest(BlockingHandler.java:56)
    at io.undertow.core@2.0.30.Final//io.undertow.server.Connectors.executeRootHandler(Connectors.java:376)
    at io.undertow.core@2.0.30.Final//io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:830)
    at org.jboss.threads@2.3.3.Final//org.jboss.threads.ContextClassLoaderSavingRunnable.run(ContextClassLoaderSavingRunnable.java:35)
    at org.jboss.threads@2.3.3.Final//org.jboss.threads.EnhancedQueueExecutor.safeRun(EnhancedQueueExecutor.java:1982)
    at org.jboss.threads@2.3.3.Final//org.jboss.threads.EnhancedQueueExecutor$ThreadBody.doRunTask(EnhancedQueueExecutor.java:1486)
    at org.jboss.threads@2.3.3.Final//org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1377)
    at java.base/java.lang.Thread.run(Thread.java:835)
    at org.jboss.threads@2.3.3.Final//org.jboss.threads.JBossThread.run(JBossThread.java:485)
Caused by: java.sql.SQLException: The server time zone value 'Mitteleurop?ische Sommerzeit' 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 deployment.mysql-connector-java-8.0.20.jar//com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:129)
    at deployment.mysql-connector-java-8.0.20.jar//com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:97)
    at deployment.mysql-connector-java-8.0.20.jar//com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:89)
    at deployment.mysql-connector-java-8.0.20.jar//com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:63)
    at deployment.mysql-connector-java-8.0.20.jar//com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:73)
    at deployment.mysql-connector-java-8.0.20.jar//com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:76)
    at deployment.mysql-connector-java-8.0.20.jar//com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:836)
    at deployment.mysql-connector-java-8.0.20.jar//com.mysql.cj.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:456)
    at deployment.mysql-connector-java-8.0.20.jar//com.mysql.cj.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:246)
    at deployment.mysql-connector-java-8.0.20.jar//com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:197)
    at org.jboss.ironjacamar.jdbcadapters@1.4.20.Final//org.jboss.jca.adapters.jdbc.local.LocalManagedConnectionFactory.createLocalManagedConnection(LocalManagedConnectionFactory.java:321)
    ... 35 more
Caused by: com.mysql.cj.exceptions.InvalidConnectionAttributeException: The server time zone value 'Mitteleurop?ische Sommerzeit' 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 java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:500)
    at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:481)
    at deployment.mysql-connector-java-8.0.20.jar//com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:61)
    at deployment.mysql-connector-java-8.0.20.jar//com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:85)
    at deployment.mysql-connector-java-8.0.20.jar//com.mysql.cj.util.TimeUtil.getCanonicalTimezone(TimeUtil.java:132)
    at deployment.mysql-connector-java-8.0.20.jar//com.mysql.cj.protocol.a.NativeProtocol.configureTimezone(NativeProtocol.java:2120)
    at deployment.mysql-connector-java-8.0.20.jar//com.mysql.cj.protocol.a.NativeProtocol.initServerSession(NativeProtocol.java:2143)
    at deployment.mysql-connector-java-8.0.20.jar//com.mysql.cj.jdbc.ConnectionImpl.initializePropsFromServer(ConnectionImpl.java:1310)
    at deployment.mysql-connector-java-8.0.20.jar//com.mysql.cj.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:967)
    at deployment.mysql-connector-java-8.0.20.jar//com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:826)
    ... 39 more

2020-06-19 12:47:04,356 ERROR [org.jboss.as.controller.management-operation] (External Management Request Threads -- 1) WFLYCTL0013: Operation ("test-connection-in-pool") failed - address: ([
    ("subsystem" => "datasources"),
    ("data-source" => "MySqlDS")
]) - failure description: "WFLYJCA0040: failed to invoke operation: WFLYJCA0047: Connection is not valid"

正如我所说的，我是一个新的，所以请不要期待太多关于野蝇的现有知识。 谢谢问候！