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Exception

java.sql.SQLException: Cannot create PoolableConnectionFactory (Socket fail to connect to host:address=(host=localhost)(port=3306)(type=primary). Connection refused (Connection refused))
	at org.apache.tomcat.dbcp.dbcp2.BasicDataSource.createPoolableConnectionFactory(BasicDataSource.java:632)
	at org.apache.tomcat.dbcp.dbcp2.BasicDataSource.createDataSource(BasicDataSource.java:534)
	at org.apache.tomcat.dbcp.dbcp2.BasicDataSource.getConnection(BasicDataSource.java:710)
	at ecommander.fwk.MysqlConnector.getConnection(MysqlConnector.java:387)
	at ecommander.persistence.common.DelayedTransaction.execute(DelayedTransaction.java:65)
	at ecommander.model.UserModelCreateCommandUnit.createUsers(UserModelCreateCommandUnit.java:133)
	at ecommander.model.UserModelBuilder.testActuality(UserModelBuilder.java:59)
	at ecommander.controllers.StartController.start(StartController.java:39)
	at ecommander.controllers.MainExecutionController.execute(MainExecutionController.java:41)
	at ecommander.controllers.TransliterationServlet.doGet(TransliterationServlet.java:69)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:529)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:623)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:210)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:154)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:179)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:154)
	at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:661)
	at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:425)
	at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:357)
	at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:294)
	at org.tuckey.web.filters.urlrewrite.NormalRewrittenUrl.doRewrite(NormalRewrittenUrl.java:213)
	at org.tuckey.web.filters.urlrewrite.RuleChain.handleRewrite(RuleChain.java:171)
	at org.tuckey.web.filters.urlrewrite.RuleChain.doRules(RuleChain.java:145)
	at org.tuckey.web.filters.urlrewrite.UrlRewriter.processRequest(UrlRewriter.java:92)
	at org.tuckey.web.filters.urlrewrite.UrlRewriteFilter.doFilter(UrlRewriteFilter.java:394)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:179)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:154)
	at ecommander.fwk.CharsetFilter.doFilter(CharsetFilter.java:36)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:179)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:154)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:168)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:90)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:481)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:130)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:93)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:346)
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:390)
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63)
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:928)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1786)
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52)
	at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191)
	at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:63)
	at java.base/java.lang.Thread.run(Thread.java:829)
Caused by: java.sql.SQLNonTransientConnectionException: Socket fail to connect to host:address=(host=localhost)(port=3306)(type=primary). Connection refused (Connection refused)
	at org.mariadb.jdbc.client.impl.ConnectionHelper.connectSocket(ConnectionHelper.java:136)
	at org.mariadb.jdbc.client.impl.StandardClient.(StandardClient.java:101)
	at org.mariadb.jdbc.Driver.connect(Driver.java:69)
	at org.mariadb.jdbc.Driver.connect(Driver.java:95)
	at org.mariadb.jdbc.Driver.connect(Driver.java:26)
	at org.apache.tomcat.dbcp.dbcp2.DriverConnectionFactory.createConnection(DriverConnectionFactory.java:52)
	at org.apache.tomcat.dbcp.dbcp2.PoolableConnectionFactory.makeObject(PoolableConnectionFactory.java:414)
	at org.apache.tomcat.dbcp.dbcp2.BasicDataSource.validateConnectionFactory(BasicDataSource.java:112)
	at org.apache.tomcat.dbcp.dbcp2.BasicDataSource.createPoolableConnectionFactory(BasicDataSource.java:628)
	... 46 more
Caused by: java.net.ConnectException: Connection refused (Connection refused)
	at java.base/java.net.PlainSocketImpl.socketConnect(Native Method)
	at java.base/java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:412)
	at java.base/java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:255)
	at java.base/java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:237)
	at java.base/java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
	at java.base/java.net.Socket.connect(Socket.java:609)
	at org.mariadb.jdbc.client.impl.ConnectionHelper.connectSocket(ConnectionHelper.java:130)
	... 54 more