问题描述

mac 下无法使用jdbc连接mysql8.0

Mysql环境

debian9 虚拟机

mysql Ver 8.0.16 for Linux on x86_64 (MySQL Community Server - GPL) #已经允许远程连接

尝试方法

Mac下使用IDEA，Datagrip均无法连接到虚拟机。Mac与虚拟机在同一网段，192.168.0.x，未使用代理连接。

但是可以使用tableplus,mysqlworkbench 等工具连接。

预测为jetbrains产品有问题。

测试在另外一台windows系统下，使用 datagrip连接mysql，成功连接。

预测mac环境有问题。

编写jdbc代码测试

依赖

mysql

mysql-connector-java

8.0.16

代码

public static void main(String[] args) {

Connection conn = null;

try {

String userName = "root";

String password = "root";

String url = "jdbc:mysql://192.168.0.115:3306/mysql";

Class.forName("com.mysql.cj.jdbc.Driver").newInstance();

conn = DriverManager.getConnection(url, userName, password);

System.out.println("connection");

} catch (Exception e) {

System.out.println("error");

e.printStackTrace();

} finally {

if (conn != null) {

try {

conn.close();

} catch (Exception e) {

e.printStackTrace();

}

}

}

}

报错

com.mysql.cj.jdbc.exceptions.CommunicationsException: 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 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:835)

at com.mysql.cj.jdbc.ConnectionImpl.(ConnectionImpl.java:455)

at com.mysql.cj.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:240)

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.mysql.driver.MysqlDriver.main(MysqlDriver.java:23)

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.NativeProtocol.readMessage(NativeProtocol.java:562)

at com.mysql.cj.protocol.a.NativeProtocol.readServerCapabilities(NativeProtocol.java:514)

at com.mysql.cj.protocol.a.NativeProtocol.beforeHandshake(NativeProtocol.java:404)

at com.mysql.cj.protocol.a.NativeProtocol.connect(NativeProtocol.java:1450)

at com.mysql.cj.NativeSession.connect(NativeSession.java:165)

at com.mysql.cj.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:955)

at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:825)

... 6 more

Caused by: java.io.EOFException: Can not read response from server. Expected to read 4 bytes, read 0 bytes before connection was unexpectedly lost.

at com.mysql.cj.protocol.FullReadInputStream.readFully(FullReadInputStream.java:67)

at com.mysql.cj.protocol.a.SimplePacketReader.readHeader(SimplePacketReader.java:63)

at com.mysql.cj.protocol.a.SimplePacketReader.readHeader(SimplePacketReader.java:45)

at com.mysql.cj.protocol.a.NativeProtocol.readMessage(NativeProtocol.java:556)

... 12 more

通用代码在windows下测试是成功连接的。感觉问题不在mysql服务器上，应该是mac下jdbc连接mysql8.0 有问题，网上搜了很多，没有解决。

到这里就没有头绪了。

mac java环境

java version "1.8.0_201"

Java(TM) SE Runtime Environment (build 1.8.0_201-b09)

Java HotSpot(TM) 64-Bit Server VM (build 25.201-b09, mixed mode)