com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failure

0 milliseconds ago. The driver has not received any packets from the server. at com.mysql.cj.jdbc.exceptions.SQLError.createCommunicationsException(SQLError.java:174) at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:64) at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:827) at com.mysql.cj.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:447) at com.mysql.cj.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:237) at com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:199) at java.sql.DriverManager.getConnection(DriverManager.java:664) at java.sql.DriverManager.getConnection(DriverManager.java:247) at com.baomidou.mybatisplus.generator.config.DataSourceConfig.getConn(DataSourceConfig.java:183) at com.baomidou.mybatisplus.generator.config.builder.ConfigBuilder.handlerDataSource(ConfigBuilder.java:270) at com.baomidou.mybatisplus.generator.config.builder.ConfigBuilder.<init>(ConfigBuilder.java:136) at com.baomidou.mybatisplus.generator.AutoGenerator.execute(AutoGenerator.java:92) at com.chinanums.order.admin.code.CodeGenerator.main(CodeGenerator.java:104) Caused by: com.mysql.cj.exceptions.CJCommunicationsException: Communications link failure The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server. at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:423) at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:61) at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:105) at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:151) at com.mysql.cj.exceptions.ExceptionFactory.createCommunicationsException(ExceptionFactory.java:167) at com.mysql.cj.protocol.a.NativeSocketConnection.connect(NativeSocketConnection.java:91) at com.mysql.cj.NativeSession.connect(NativeSession.java:150) at com.mysql.cj.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:947) at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:817) ... 10 more Caused by: java.net.ConnectException: Connection timed out: connect at java.net.DualStackPlainSocketImpl.connect0(Native Method) at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:79) at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350) at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206) at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188) at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172) at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) at java.net.Socket.connect(Socket.java:589) at com.mysql.cj.protocol.StandardSocketFactory.connect(StandardSocketFactory.java:155) at com.mysql.cj.protocol.a.NativeSocketConnection.connect(NativeSocketConnection.java:65) ... 13 more Exception in thread "main" java.lang.NullPointerException at com.baomidou.mybatisplus.generator.config.builder.ConfigBuilder.getTablesInfo(ConfigBuilder.java:442) at com.baomidou.mybatisplus.generator.config.builder.ConfigBuilder.handlerStrategy(ConfigBuilder.java:282) at com.baomidou.mybatisplus.generator.config.builder.ConfigBuilder.<init>(ConfigBuilder.java:143) at com.baomidou.mybatisplus.generator.AutoGenerator.execute(AutoGenerator.java:92) at com.chinanums.order.admin.code.CodeGenerator.main(CodeGenerator.java:104)

因为是使用的公司内的数据库，没有连接到数据库，所以才报这样的异常。

能够连接上公司内的数据库，就不会出现这样的异常情况了’

com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failure

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