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java.sql.SQLException: null, message from server: "Host 'www.aactni.edu.in' is blocked because of many connection errors; unblock with 'mysqladmin flush-hosts'"

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com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Server connection failure during transaction. Due to underlying exception: 'java.sql.SQLException: null, message from server: "Host 'www.aactni.edu.in' is blocked because of many connection errors; unblock with 'mysqladmin flush-hosts'"'. ** BEGIN NESTED EXCEPTION ** java.sql.SQLException MESSAGE: null, message from server: "Host 'www.aactni.edu.in' is blocked because of many connection errors; unblock with 'mysqladmin flush-hosts'" STACKTRACE: java.sql.SQLException: null, message from server: "Host 'www.aactni.edu.in' is blocked because of many connection errors; unblock with 'mysqladmin flush-hosts'" at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1056) at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:957) at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1040) at com.mysql.jdbc.Connection.createNewIO(Connection.java:2078) at com.mysql.jdbc.Connection.(Connection.java:716) at com.mysql.jdbc.JDBC4Connection.(JDBC4Connection.java:46) at sun.reflect.GeneratedConstructorAccessor8.newInstance(Unknown Source) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:526) at com.mysql.jdbc.Util.handleNewInstance(Util.java:353) at com.mysql.jdbc.Connection.getInstance(Connection.java:295) at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:266) at java.sql.DriverManager.getConnection(DriverManager.java:571) at java.sql.DriverManager.getConnection(DriverManager.java:215) at org.apache.jsp.index_jsp._jspService(index_jsp.java:735) at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) at javax.servlet.http.HttpServlet.service(HttpServlet.java:728) at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:472) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339) at javax.servlet.http.HttpServlet.service(HttpServlet.java:728) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:110) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:444) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:1025) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:445) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1137) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:637) at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:317) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(Thread.java:724) ** END NESTED EXCEPTION ** Attempted reconnect 3 times. Giving up.

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com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Server connection failure during transaction. Due to underlying exception: 'java.sql.SQLException: null, message from server: "Host 'www.aactni.edu.in' is blocked because of many connection errors; unblock with 'mysqladmin flush-hosts'"'. ** BEGIN NESTED EXCEPTION ** java.sql.SQLException MESSAGE: null, message from server: "Host 'www.aactni.edu.in' is blocked because of many connection errors; unblock with 'mysqladmin flush-hosts'" STACKTRACE: java.sql.SQLException: null, message from server: "Host 'www.aactni.edu.in' is blocked because of many connection errors; unblock with 'mysqladmin flush-hosts'" at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1056) at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:957) at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1040) at com.mysql.jdbc.Connection.createNewIO(Connection.java:2078) at com.mysql.jdbc.Connection.(Connection.java:716) at com.mysql.jdbc.JDBC4Connection.(JDBC4Connection.java:46) at sun.reflect.GeneratedConstructorAccessor8.newInstance(Unknown Source) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:526) at com.mysql.jdbc.Util.handleNewInstance(Util.java:353) at com.mysql.jdbc.Connection.getInstance(Connection.java:295) at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:266) at java.sql.DriverManager.getConnection(DriverManager.java:571) at java.sql.DriverManager.getConnection(DriverManager.java:215) at org.apache.jsp.index_jsp._jspService(index_jsp.java:839) at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) at javax.servlet.http.HttpServlet.service(HttpServlet.java:728) at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:472) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339) at javax.servlet.http.HttpServlet.service(HttpServlet.java:728) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:110) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:444) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:1025) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:445) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1137) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:637) at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:317) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(Thread.java:724) ** END NESTED EXCEPTION ** Attempted reconnect 3 times. Giving up.

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com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Server connection failure during transaction. Due to underlying exception: 'java.sql.SQLException: null, message from server: "Host 'www.aactni.edu.in' is blocked because of many connection errors; unblock with 'mysqladmin flush-hosts'"'. ** BEGIN NESTED EXCEPTION ** java.sql.SQLException MESSAGE: null, message from server: "Host 'www.aactni.edu.in' is blocked because of many connection errors; unblock with 'mysqladmin flush-hosts'" STACKTRACE: java.sql.SQLException: null, message from server: "Host 'www.aactni.edu.in' is blocked because of many connection errors; unblock with 'mysqladmin flush-hosts'" at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1056) at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:957) at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1040) at com.mysql.jdbc.Connection.createNewIO(Connection.java:2078) at com.mysql.jdbc.Connection.(Connection.java:716) at com.mysql.jdbc.JDBC4Connection.(JDBC4Connection.java:46) at sun.reflect.GeneratedConstructorAccessor8.newInstance(Unknown Source) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:526) at com.mysql.jdbc.Util.handleNewInstance(Util.java:353) at com.mysql.jdbc.Connection.getInstance(Connection.java:295) at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:266) at java.sql.DriverManager.getConnection(DriverManager.java:571) at java.sql.DriverManager.getConnection(DriverManager.java:215) at org.apache.jsp.index_jsp._jspService(index_jsp.java:939) at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) at javax.servlet.http.HttpServlet.service(HttpServlet.java:728) at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:472) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339) at javax.servlet.http.HttpServlet.service(HttpServlet.java:728) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:110) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:444) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:1025) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:445) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1137) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:637) at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:317) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(Thread.java:724) ** END NESTED EXCEPTION ** Attempted reconnect 3 times. Giving up.