com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Data source rejected establishment of connection, message from server: Too many connections
最简单的办法是因为你的my.ini中设定的并发连接数太少或者系统繁忙导致连接数被占满解决方式：打开MySQL安装目录打开MY.INI找到max_connections默认是100.--实例WINDOWS解决mysql Errno.:1040错误XXXXinfo:CannotconnecttoMySQLserv...
ORA-28509: unable to establish a connection to non-Oracle system
文档解释ORA-28509:unabletoestablishaconnectiontonon-OraclesystemCause:Initializationofadatabaselinktoanon-OraclesystemfailedtoconnecttotheHeterogeneousServicesagent...
ORA-30683: failure establishing connection to debugger
文档解释ORA-30683:failureestablishingconnectiontodebuggerCause:Anerrorwasindicatedwhentryingtoestablishaconnectiontoadebugger.UsuallyaTNSerrorwilldisplayalongwithth...
MySQL Error number: MY-011803; Symbol: ER_LDAP_AUTH_FAILED_TO_ESTABLISH_TLS_CONNECTION; SQLSTATE: HY000
文档解释Errornumber:MY-011803;Symbol:ER_LDAP_AUTH_FAILED_TO_ESTABLISH_TLS_CONNECTION;SQLSTATE:HY000Message:FailedtoestablishTLSconnection:%s错误说明MY-011803错误是MySQL定义的...
MySQL Error number: MY-011577; Symbol: ER_GRP_RPL_ESTABLISH_RECOVERY_WITH_ANOTHER_DONOR; SQLSTATE: HY000
文档解释Errornumber:MY-011577;Symbol:ER_GRP_RPL_ESTABLISH_RECOVERY_WITH_ANOTHER_DONOR;SQLSTATE:HY000Message:Retryinggrouprecoveryconnectionwithanotherdonor.Attempt%...
Data source rejected establishment of connection, message from server: "Too many connections"
错误原因: 太多的连接数，登录用户过多，配置的mysql连接数过小，或者某些连接没有关闭，导致连接数过大。问题的解决： 修改mysql的my.ini配置文件，网上的说法：mysql安装目录下的my.ini中设定的并发连接数太少或者系统繁忙导致连接数被占...
Wed Jul 04 18:01:38 CST 2018 WARN: Establishing SSL connection without server's identity verification is not recommended
WedJul0418:01:38CST2018WARN:EstablishingSSLconnectionwithoutserver'sidentityverificationisnotrecommended.AccordingtoMySQL5.5.45+,5.6.26+and5.7.6+requirementsSSL...
WARN: Establishing SSL connection without server's identity verification is not recommended
0.要想用Java连接mysql数据库，首先装好JDK，配置好环境变量，将jdk*.*.*lib放入classpath，将jdk*.*.*in放入path中（*.*.*表示版本号）；其次安装好mysql数据库，然后下载连接数据库要用的驱动包，并配置环境变量（配置方法，将驱动包的路径放入classpath中）。&nbs...