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HarmonyOS
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
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.16</version>
</dependency>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.<init>(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)
java
mysql
ios
windows装 debian虚拟机测试了下，mac可以连接。
排查网络问题，接过mac后台启动了ssr，坑爹了。打开ssr设置了下就好了。