Question

在Eclipse中尝试通过数据库开发（数据源资源管理器）进行连接，在测试连接期间，我发现ping操作失败。

com.mysql.cj.jdbc.exceptions.CommunicationsException：通信链接失败

成功发送到服务器的最后一个数据包是0毫秒前。驱动程序尚未收到来自服务器的任何数据包。

const onEventDrop = ({event, start, end, isAllDay}) => {
  const updatedEvent = {...event, start, end, isAllDay};
  // Any other logic. If async saving your change, you'll probably
  // do the next line in a `.then()`
  setEvents((prevEvents) => {
    const filtered = prevEvents.filter((item) => item.id !== event.id);
    return [...filtered, updatedEvent];
  });
};

由以下原因引起：com.mysql.cj.exceptions.CJCommunicationsException：通信链接失败

成功发送到服务器的最后一个数据包是0毫秒前。驱动程序尚未收到来自服务器的任何数据包。

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:836)

at com.mysql.cj.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:456)

at com.mysql.cj.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:246)

at com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:197)

at org.eclipse.datatools.connectivity.drivers.jdbc.JDBCConnection.createConnection(JDBCConnection.java:328)

at org.eclipse.datatools.connectivity.DriverConnectionBase.internalCreateConnection(DriverConnectionBase.java:105)

at org.eclipse.datatools.connectivity.DriverConnectionBase.open(DriverConnectionBase.java:54)

at org.eclipse.datatools.connectivity.drivers.jdbc.JDBCConnection.open(JDBCConnection.java:96)

at org.eclipse.datatools.enablement.internal.mysql.connection.JDBCMySQLConnectionFactory.createConnection(JDBCMySQLConnectionFactory.java:28)

at org.eclipse.datatools.connectivity.internal.ConnectionFactoryProvider.createConnection(ConnectionFactoryProvider.java:83)

at org.eclipse.datatools.connectivity.internal.ConnectionProfile.createConnection(ConnectionProfile.java:359)

at org.eclipse.datatools.connectivity.ui.PingJob.createTestConnection(PingJob.java:76)

at org.eclipse.datatools.connectivity.ui.PingJob.run(PingJob.java:59)

at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)

原因：java.net.ConnectException：连接被拒绝：connect

at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)

at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)

at java.lang.reflect.Constructor.newInstance(Unknown Source)

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:144)

at com.mysql.cj.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:956)

at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:826)

... 13 more

Ping失败-com.mysql.cj.jdbc.exceptions.CommunicationsException：通信链接失败

0 个答案: