堆棧跟蹤：Exception in thread "main" org.hibernate.exception.JDBCConnectionException: Could not open connection at org.hibernate.exception.internal.SQLExceptionTypeDelegate.convert(SQLExceptionTypeDelegate.java:67) at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:49) at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:125) at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:110) at org.hibernate.engine.jdbc.internal.LogicalConnectionImpl.obtainConnection(LogicalConnectionImpl.java:304) at org.hibernate.engine.jdbc.internal.LogicalConnectionImpl.getConnection(LogicalConnectionImpl.java:169) at org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction.doBegin(JdbcTransaction.java:67) at org.hibernate.engine.transaction.spi.AbstractTransactionImpl.begin(AbstractTransactionImpl.java:160) at org.hibernate.internal.SessionImpl.beginTransaction(SessionImpl.java:1396) at com.telusko.DemoHibb.App.main(App.java:24)我的 Hibernate.cfg.xml 文件是：<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd"><hibernate-configuration> <session-factory> <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property> <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/neon</property> <property name="hibernate.connection.username">root</property> <property name="hibernate.connection.password">root</property> <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property> <property name="hbm2ddl.auto">update</property> </session-factory></hibernate-configuration>
2 回答
心有法竹
TA貢獻1866條經驗 獲得超5個贊
請檢查您的 MySQL 服務器是否正在運行：
對于 Unix (sh)：
sudo netstat -npl | grep 3306
對于 Windows（cmd）：
netstat -aon | find /i "3306"
如果為空則運行 MySQL-server或更改端口
慕運維8079593
TA貢獻1876條經驗 獲得超5個贊
問題在于舊版本的 MySQL Connector/J 與 MySQL 8 的兼容性。我只需將 SQL Connector 版本升級為最新版本。
經過一番努力，我能夠找到問題所在。
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