【文章推薦】c3p0連接錯誤 An attempt by a client to checkout a Connection has timed out.

原文：c3p0連接錯誤 An attempt by a client to checkout a Connection has timed out.

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配置c3p0連接池出現錯誤：java.sql.SQLException: An attempt by a client to checkout a Connection has timed

mysql是8版本的，在學習c3p0鏈接池配置的時候出現了一些問題,記錄一下錯誤.. 剛開始出現的是這個錯誤：java.lang.NoClassDefFoundError: com/mchange/v2/ser/Indirector 查了一下是缺少 ...

c3p0出現 An attempt by a client to checkout a Connection has timed out

java.sql.SQLException: An attempt by a client to checkout a Connection has timed out. at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java ...

Could not obtain connection to query metadata : An attempt by a client to checkout a Connection has timed out.]

hibernate c3p0配置： <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans ...

log報錯： Caused by: java.sql.SQLException: An attempt by a client to checkout a Connection has timed out.

報錯：解決方式： 1、登錄數據庫查看錯誤原因結果發現賬號無法正常登錄出現賬號被鎖定的錯誤。 2、如何賬號解鎖？用sys系統管理員賬號登錄數據庫 SQL> alter user 用戶名 account unlock; (解鎖) SQL>alter user ...

報錯： Could not open JDBC Connection for transaction; nested exception is java.sql.SQLException: An attempt by a client to checkout a Connection has

mysql數據庫連接出問題，提示超時 java.sql.SQLException: An attempt by a client to checkout a Connection has timed out.解決辦法

mysql數據庫連接出問題，提示超時，后來發現問題在於連接mysql數據庫的jar包跟數據庫版本不對應導致的，更換jar包一致就解決了。 ...

to checkout a Connection has timed out.

本人今天新部署在UAT環境的war包,一直進不去系統，但是tomcat服務器（ip:8080）是能進去的，查詢日志為： Caused by: com.mchange.v2.resourcepool.TimeoutException: A client timed out while ...

一次c3p0連接池連接異常錯誤的排查

近期寫了一個數據庫採集程序，大概過程是將SQLSERVER數據庫的數據定時採集到Oracle數據庫。 1小時出一次數據，每次數據量在2W左右。環境採用Sping3+hibernate4,數據庫連接池採用C3p0 奇怪的時候每隔一段時間都會報：“c3p0 connection ...

原文：c3p0連接錯誤 An attempt by a client to checkout a Connection has timed out.

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