C3P0連線mysql8.0存在的問題？
阿新 • • 發佈：2021-01-06
一、環境介紹：
二、問題描述：
警告: [email protected]e0 -- Acquisition Attempt Failed!!! Clearing pending acquires. While trying to acquire a needed new resource, we failed to succeed more than the maximum number of allowed acquisition attempts (30). Last acquisition attempt exception: java.sql.SQLException: No suitable driver at java.sql.DriverManager.getDriver(DriverManager.java:315) at com.mchange.v2.c3p0.DriverManagerDataSource.driver(DriverManagerDataSource.java:223) at com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:119) at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:143) at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:132) at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:137) at com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResourcePool.java:1014) at com.mchange.v2.resourcepool.BasicResourcePool.access$800(BasicResourcePool.java:32) at com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask.run(BasicResourcePool.java:1810) at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:547)
分析：
mysql的驅動版本和mysql8.0版本可以匹配，但是c3p0版本太低，不匹配？
三、解決方案：
更新C3P0驅動，網址：
https://mvnrepository.com/artifact/com.mchange/c3p0
將新的驅動新增，並buildpath即可。
同時提供資料庫連線的XML配置檔案需要修改：
<property name="driverClass">com.mysql.cj.jdbc.Driver</property> <property name="jdbcUrl">jdbc:mysql:///test?useSSL=false&serverTimezone=UTC</property>
四、測試執行：
[email protected]