mchange

c3p0配置连接测试

原文：http://www.mchange.com/projects/c3p0/#configuring_connection_testingc3p0提供了多种检测失效连接的方法，避免程序因为使用失效的连接而报错
米修hefengwen·2020-08-24 16:23

bug记录 网商练习

bug代码：十月29,20198:16:40下午com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSourcegetPoolManager信息:Initializingc3p0pool
请不要留恋·2020-08-24 15:24

C3p0的问题：testConnectionOnCheckin -＞ false, testConnectionOnCheckout -＞ false

环境：使用云服务器搭建CDH的时候报错问题：如下2020-06-0719:21:32,847INFOmain:com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource
花掏尽·2020-08-24 12:32

数据库连接池参数

com.mchange.v2.resourcepool.BasicResourcePool@7d322cadconfig:[start->3;min->3;max->8;inc->3;num_acq_attempts
hanhanhan2019·2020-08-24 08:51

c3p0 c3p0.properties

JdbcUtilimportjava.sql.Connection;importjava.sql.SQLException;importcom.mchange.v2.c3p0.ComboPooledDataSource
鹏Apan·2020-08-23 23:02

Log4j具体输出信息级别配置方法

新加设置某个包的级别：log4j.rootLogger=DEBUG,A1,Rlog4j.logger.com.mchange.v2=INFO,A1,R1.配置文件Log
云海无涯victory·2020-08-21 19:37

Spring | JDBC

一、JdbcTemplate介绍JdbcTemplate是SpringJDBC框架的核心，JDBC模板的设计目的是为了不同类型的JDBC操作提供模板方法二、导入的架包mchange-commons-java
EclipseO2·2020-08-21 15:44

项目启动报错 nested exception is java.lang.NoClassDefFoundError: com/mchange/v2/cfg/MConfig

电脑跑项目的时候遇到了个莫名其妙的问题Invocationofinitmethodfailed;nestedexceptionisjava.lang.NoClassDefFoundError:com/mchange
不拿offer不改名·2020-08-20 23:38

JDBC_Utils框架以及连接池的使用

说明：小白入门，有任何问题欢迎指出交流JDBC框架以及连接池的使用方式简述1、C3P0连接池文档链接：https://www.mchange.com/projects/c3p0/首先引入相应jar包：c3p0
ThinkKite·2020-08-19 20:35

ERROR: relation "public.userinfo" does not exist

ALTERTABLE"userInfo"OWNERTOsa;GRANTALLONTABLE"userInfo"TOsa;GRANTALLONTABLE"userInfo"TOpublic;Initializingc3p0pool...com.mchange.v2
DracoTianlong·2020-08-19 16:52

C3P0Linux上报错找不到主机

C3P0在Linux下的错误内容31-Jul-201414:14:43.072INFO[localhost-startStop-1]com.mchange.v2.c3p0.impl.C3P0ImplUtils.generateVmIdFailedtogetlocalInetAddressforVMID.Thisisunlikelytomatter.Atall.We
wenjie12201·2020-08-19 05:18

连接池和log4j

Threadlocal控制获取同一个conn3、利用连接池获取多个conn//连接池：创建单个conn创建多个conn利用Threadlocal（map放线程和conn）绑定同一个conn//加入两个jar包mchange
你得握有刀剑·2020-08-19 03:44

c3p0连接池的log4j日志配置

在log4j.properties中加入：#c3p0log4j.logger.com.mchange.v2.resourcepool.BasicResourcePool=DEBUG,C1#c3p0appenderlog4j.appender.C1
iteye_9223·2020-08-19 02:16

dbutils中queryRunner.query的注意事项

报错信息如下：信息:Initializingc3p0pool...com.mchange.v2.c3p0.ComboPooledDataSource[acquireIncrement->3,acquireRetryAttempts
凌研研·2020-08-17 13:15

阿里云服务器MySQL无法连接问题解决纪实

本文由fbysss原创，转载请注明出处背景：在调试程序的时候，发现数据库访问相关的环节出现错误：12:16:40,941WARNThreadPoolAsynchronousRunner:608-com.mchange.v2
fbysss·2020-08-16 19:33

JavaEE三层结构——用户管理(添加用户)

:mysql:///casedemocasedemo1233、创建好所需要的包在utils包里有一个C3p0Utils工具类packagecn.usermanager.utils;importcom.mchange.v2
Rxd123321Lm·2020-08-15 01:02

数据库连接池之ComboPooledDataSource

：c3p0c3p00.9.1.2因为是mysql数据库，所以还需要mysqlmysql-connector-java5.1.34第一种方式：不采用配置文件配置，纯java代码连接：importcom.mchange.v2
凌恩泽·2020-08-14 23:04

【oracle】oracle jdbc驱动与c3p0的一个兼容问题

oracle12c12.1.0.1oraclejdbc712.1.0.1c3p00.9.1.1tomcat7.0.55jdk1.7问题java.lang.RuntimeException:java.lang.AbstractMethodError:com.mchange.v2
sayyy·2020-08-14 07:57

jsp mysql 实现客户端简单分页查询

jspmysql实现客户端简单分页查询dao.implimportcom.mchange.v2.c3p0.ComboPooledDataSource;importorg.apache.commons.dbutils.QueryRunner
一念之间123·2020-08-13 20:00

【Java Web】jdbc —— 使用C3P0数据库连接池报错java.lang.ClassNotFoundException

问题引入今天在使用数据库连接池（C3P0）连接数据库时，总是连接不上数据库，并且会报以下错误：Exceptioninthread"main"java.lang.NoClassDefFoundError:com/mchange
酱懵静·2020-08-13 19:56

jsp mysql 实现客户端简单数据的修改和删除

jspmysql实现客户端简单数据的修改和删除dao.implimportcom.mchange.v2.c3p0.ComboPooledDataSource;importday13.dao.StudentDao
一念之间123·2020-08-12 22:00

jsp 简单把数据库数据，展示在网页

页面代码：StudentDaoImplimportcom.mchange.v2.c3p0.ComboPooledDataSource;importday13.dao.StudentDao;importday13
一念之间123·2020-08-12 14:00

c3p0连接异常处理

com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@11d9f05--AcquisitionAttemptFailed!!!
Babilonia·2020-08-12 13:24

DEBUG STACK TRACE for PoolBackedDataSource.close().

大家也可以看下先贴出来异常的部分代码:Java代码java.lang.Exception:DEBUGSTACKTRACEforPoolBackedDataSource.close().atcom.mchange.v2
zhiweianran·2020-08-12 00:59

java.lang.Exception: DEBUG STACK TRACE for PoolBackedDataSource.close().

java.lang.Exception:DEBUGSTACKTRACEforPoolBackedDataSource.close().atcom.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource.close
lele2426·2020-08-11 21:16

发布两配置有相同jar包的项目时报错：DEBUG STACK TRACE for PoolBackedDataSource.close().

大家也可以看下先贴出来异常的部分代码:Java代码java.lang.Exception:DEBUGSTACKTRACEforPoolBackedDataSource.close().atcom.mchange.v2
嘟嘟QQ7·2020-08-11 21:07

c3p0连接池连接失败：java.sql.SQLException: Connections could not be acquired from the underlying database!

问题描述：最近在使用c3p0连接池写一个小项目，在测试时始终无法正确连接数据库，报错如下：com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask
Star_Ship·2020-08-11 19:51

jsp,servlet 连接c3p0数据库连接池是出现的问题

九月02,201510:17:48下午com.mchange.v2.log.MLogINFO:MLogclientsusingjava1.4+standardlogging.九月02,201510:17
YUAN_DETECTION·2020-08-11 19:31

使用c3p0数据库连接池的各种报错警告: Having failed to acquire a resource, com.mchange.v2.resourcepool

在尝试使用c3p0数据库连接池的时候，首先先导入了三个jar包：c3p0-0.9.5.2.jarmchange-commons-java-0.2.3.4.jarmysql-connector-java-8.0.13.jar然后写了c3p0-config.xml配置文件如下：com.mysql.jdbc.Driverjdbc:mysql://localhost:3306/TestDB?useSSL=
栖欢_·2020-08-11 19:20

c3p0 空指针异常 com.mchange.v2.resourcepool.CannotAcquireResourceException: A ResourcePool could not acqu.

com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@11d9f05--AcquisitionAttemptFailed!!!
weixin_30765577·2020-08-11 18:48

解决c3p0：Connections could not be acquired from the underlying database!

atcom.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:106)atcom.mchange.v2.c3p0.impl.C3P0PooledConne
weixin_30559481·2020-08-11 18:04

c3p0 空指针异常 com.mchange.v2.resourcepool.CannotAcquireResourceException: A ResourcePool could not acqu.

com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@11d9f05--AcquisitionAttemptFailed!!!
詹小布·2020-08-11 18:22

今天本地调试的时候出现几次com.mchange.v2.resourcepool.CannotAcquireResourceException:

此问题暂未查明原因严重:Servlet.service()forservlet[springmvc]incontextwithpath[]threwexception[Requestprocessingfailed;nestedexceptionisorg.springframework.transaction.CannotCreateTransactionException:Couldnotop
Alvin_Zhu·2020-08-11 18:42

在关闭tomcat 的时候报 线程未关闭的问题

org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreadsThewebapplication[day14]appearstohavestartedathreadnamed[com.mchange.v2
vivid1993·2020-08-11 17:46

解决C3P0连接中Caused by: com.mchange.v2.resourcepool.CannotAcquireResourceException: A ResourcePool

在使用C3P0连接时出现问题Causedby:com.mchange.v2.resourcepool.CannotAcquireResourceException:AResourcePoolcouldnotacquirearesourcefromitsprimaryfactoryorsource.atcom.mchange.v2
cx-young·2020-08-11 17:37

logback使用c3p0连接池没有写配置文件会报警告处理方法

com.mchange.v2.cfg.DelayedLogItem[level->FINE,text->“Theconfigurationfileforresourceidentifier‘/mchange-commons.properties
心动_·2020-08-11 17:27

com.mchange.v2.resourcepool.ResourcePoolException: Attempted to use a closed or broken resource pool

com.mchange.v2.resourcepool.ResourcePoolException:Attemptedtouseaclosedorbrokenresourcepool1，检查配置文件classpath
大卫不加班·2020-08-11 17:54

使用JPA persistence.xml报错:A ResourcePool could not acquire a resource from its primary factory or sour

Causedby:com.mchange.v2.resourcepool.CannotAcquireResource
东非大裂谷·2020-08-11 17:00

com.mchange.v2.resourcepool.CannotAcquireResourceException: A ResourcePool could

Spring结合c3p0的时候,出现如下异常:com.mchange.v2.resourcepool.CannotAcquireResourceException:AResourcePoolcouldnotacquirearesourcefromitsprimaryfactoryorsource
macrotea·2020-08-11 17:49

spring 连接池配置C3P0的详细配置说明（com.mchange.v2.c3p0.ComboPooledDataSource）

C3P0是一个开放源代码的JDBC连接池，它在lib目录中与Hibernate一起发布,包括了实现jdbc3和jdbc2扩展规范说明的Connection和Statement池的DataSources对象。c3p0-config>3301000falseTestfalse100nullfalse60360151003rootpasswordselectidfromtestwhereid=1300f
明月天国·2020-08-11 17:04

hibernate c3p0的配置

项目中用到了hibernate,后来出现了mysql闲置8小时候就自动断开链接的问题,这样用了s3p0连接池来试试,哪知道问题依旧没有解决,经常出现如下的错误:com.mchange.v2.resourcepool.BasicResourcePool
lifesounds·2020-08-11 17:03

无访问权限导致的com.mchange.v2.resourcepool.CannotAcquireResourceException: A ResourcePo

39PMorg.apache.catalina.core.StandardWrapperValveinvokeSEVERE:Servlet.service()forservletjspthrewexceptioncom.mchange.v2
iteye_8608·2020-08-11 17:47

C3p0使用时出现的异常及解决方案

连接池会出现如下异常信息：Causedby:java.sql.SQLException:AnattemptbyaclienttocheckoutaConnectionhastimedout.atcom.mchange.v2
iteye_17686·2020-08-11 16:38

C3P0的详细配置说明（com.mchange.v2.c3p0.ComboPooledDataSource）

C3P0是一个开放源代码的JDBC连接池，它在lib目录中与Hibernate一起发布,包括了实现jdbc3和jdbc2扩展规范说明的Connection和Statement池的DataSources对象。c3p0-config>3301000falseTestfalse100nullfalse60360151003rootpasswordselectidfromtestwhereid=1300f
houfeng30920·2020-08-11 16:18

c3p0.properties配置引起的com.mchange.v2.resourcepool.TimeoutException

c3p0.properties配置引起的com.mchange.v2.resourcepool.TimeoutException最近由于客户业务量的增长，公司决定使用分布式处理的方式来解决客户反应的处理速度慢的问题
Aeolus_Jaeger·2020-08-11 16:07

使用c3p0数据库连接池时出现com.mchange.v2.resourcepool.TimeoutException

最近访问压力增大后台tomcat的日志里面频繁出现com.mchange.v2.resourcepool.TimeoutException:Aclienttimedoutwhilewaitingtoacquirearesourcefromcom.mchange.v2
flyflyfly55555·2020-08-11 16:33

【MySQL】使用JDBC时，无法连接远程MySQL数据库

时无法连接远程MySQL数据库问题解决过程总结问题今天连接MySQL的时候，程序很久没有反应，在过了几分钟后向我抛出了一堆异常：警告:Havingfailedtoacquirearesource,com.mchange.v2
cflys·2020-08-11 16:21

(已解决)C3P0数据库使用配置文件链接，报错:com.mchange.v2.async.ThreadPoolAsynchronousRunner$DeadlockDetector run...

所以打算自己来体验一下C3P创建的具体过程，在使用C3P0指定的配置文件来创建连接执行简单操作测试时，出现了以下的错误：四月11,20198:51:04上午com.mchange.v
avw0108·2020-08-11 16:57

A ResourcePool could not acquire a resource from its primary factory or source

atcom.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:106)~[c3p0-0.9.1.2.jar:0.9.1.2]atcom.mchange
_荣耀之路_·2020-08-11 16:25

WARN BasicResourcePool:1841 - com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@ddfbdac -

启动Web项目的过程中，遇到了这样一个问题WARNBasicResourcePool:1841-com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask
我爱猪刚鬣·2020-08-11 16:02
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