c3p0

Error occured while trying to acquire a cached PreparedStatement in a background thread

由 好久不见. 提交于 2019-12-25 04:23:33
问题 we are using connection pooling which is provided by mule in Database component. we are getting below error when we applied huge load. configured parameters as : maxConnection=100, minConn=0, autoIncrement =15 waitMillisec=10000 and prepared statement cache size kept it as default(i.e did not configure anything). Could you please assit on this to reslove below. {"timestamp":"2016-10-22T09:28:13,611","level":"WARN","thread":"ActiveMQ Session Task-25","loggerName":"com.mchange.v2.c3p0.impl

Hibernate: c3p0 throws NullPointerException at NewProxyConnection.commit()

由 我的梦境 提交于 2019-12-25 04:19:40
问题 I am using both Hibernate and C3P0 in version 4.3.1.Final. MySQL 5.6.14 (InnoDB for all tables). C3P0 settings in hibernate.cfg.xml are: <property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider</property> <property name="hibernate.c3p0.timeout">300</property> <property name="hibernate.c3p0.idle_test_period">3000</property> <property name="hibernate.c3p0.preferredTestQuery">SELECT 1</property> <property name="hibernate.c3p0.minPoolSize">3</property>

c3p0 deadlock on RefurbishCheckinResourceTask, getConnection()

由 纵然是瞬间 提交于 2019-12-25 02:25:36
问题 I've a webApp deployed on tomcat6, there's an import message function, which will import a large amount of messages persisting them into an Oracle 11g database. I'm getting the deadlock occasionally/unpredictably, after running import for a while. The trace : 7 août 2014 13:04:38 com.mchange.v2.async.ThreadPoolAsynchronousRunner$DeadlockDetector run ATTENTION: com.mchange.v2.async.ThreadPoolAsynchronousRunner$DeadlockDetector@637d7dd6 -- APPARENT DEADLOCK!!! Creating emergency threads for

Is there any reason to keep around a c3p0.properties file when you use hibernate.cfg.xml?

由 我与影子孤独终老i 提交于 2019-12-25 01:53:27
问题 Our project uses Hibernate (3.3.2) with c3p0 as our connection pool. For a while, it seems there were some c3p0 properties in a c3p0.properties file, and others in hibernate.cfg.xml. I've just moved the last two c3p0 properties into hibernate.cfg.xml and confirmed they are being respected. Is there ANY reason to keep around the c3p0 properties file, when c3p0 properties can be specified in hibernate.cfg.xml? Such as there being a property that can't be configured there, or another reason I'm

SSM（Spring+SpringMVC+Mybatis）框架搭建详细教程【附源代码Demo】

由 生来就可爱ヽ(ⅴ＜●) 提交于 2019-12-24 19:12:02
【前言】 　　应某网络友人邀约，需要一个SSM框架的Demo作为基础学习资料，于是乎，就有了本文。一个从零开始的SSM框架Demo对一个新手来说，是非常重要的，可大大减少在学习过程中遇到的各种各样的坑，说到最后，也算是助人为乐吧！下面我们从零开始进行SSM框架的搭建，在介绍最后，我会把项目部署在 GitHub 以便需要Demo的亲朋好友们进行下载~~~ 　 　 https://github.com/sevenTiny/Demo.SSM 　 （访问记得Star哦~） 　　 本Demo是在IDEA下搭建的Maven项目，在进行下面阅读前先了解这一点！ 【开发环境】 　　1.操作系统：Windows7 ×64 Sp1 　　 　　2.Java-Version：1.8.0_101 　　 　　3.IDE:IntelliJ IDEA 2017.2.2 x64 　　 一、新建项目 　　运行IDEA，进入初始化界面，然后我们选择新建项目（进入主界面新建项目也是一样的） 　　 　　在Maven选项卡里面找到对应的java web选项，然后我们点下一步 　　 　　这一步填入组织等信息，这里比较随意，按照自己的需求进行填写，然后下一步 　　 　　这里我早已配置好本地Maven仓库，因此直接默认即可。如果没进行配置本地默认仓库的话，请网上查找对应的资料进行配置 　　 　　输入Project name

Idle (not idle in transaction) connections are not released/closed in PostgreSQL AWS RDS

由 ☆樱花仙子☆ 提交于 2019-12-24 19:05:10
问题 I'm using C3P0 connection pool and PostgreSQL(10.3) in AWS RDS. I did a load test at low TPS (1 TPS) for 2 minutes, after load test finished, the number of connections were not dropped according to the monitoring board in AWS RDS. (See below). Neither did CPU utilization. I'm still new to database, not sure if this is expected? This seems like it's reaching RDS instance's max_connection. I did a select from pg_stat_activity , 99% of connections are idle , and most of the queries are SHOW

SpringAOP——通过JdbcTemplate连接数据库，并使用事务（Transactional）（使用IDEA进行编程）

由 冷暖自知 提交于 2019-12-24 14:06:05
JdbcTemplate:用于操作数据库，与Dbutils一样，是一个操作数据库的工具。 首先声明事物是很简单的，只是为了展现例子，需要做很多准备工作。 1）使用c3p0获取连接： 　　先导入mysql的jar包:　　mysql-connector-java-8.0.16.jar 　　再导入c3p0的3个jar包:　　c3p0-0.9.5.2.jar　　c3p0-oracle-thin-extras-0.9.5.2.jar　　mchange-commons-java-0.2.11.jar 　　　　　　　　　　　　下载地址：https://sourceforge.net/projects/c3p0/files/latest/download?source=files ——等待一会自动弹出下载框 　　　　　　　　　　　　c3p0的基础知识：https://www.cnblogs.com/ygj0930/p/6405861.html 2)创建配置文件： 　　先创建：db.properties　　https://blog.csdn.net/u013164931/article/details/76283884 jdbc.user=root jdbc.pssward=123456 jdbc.driverClass=com.mysql.cj.jdbc.Driver jdbc.url=jdbc

C3P0 Creating too many Threads and Timers

由 假如想象 提交于 2019-12-23 12:58:13
问题 I have a Java webapp running on Tomcat, with Hibernate and C3P0. All entity classes and JPA Controllers were done with Netbeans wizzard. There is a servlet that when called inserts many objects in the database (using the JPA controllers). The problem is that looking at my webapp with Java VisualVM I found that there are a lot of Timers and com.mchange.v2.async.ThreadPoolAsynchronousRunner classes, and it grows as time pass. For every Timer there are 3 Threads created. All the Threads and

How to configure MySQL connection properties with Spring, Hibernate 3.3 and c3p0?

由 夙愿已清 提交于 2019-12-23 12:43:51
问题 I am currently in the process of upgrading an application from Hibernate 3.2 to Hibernate 3.3. I though I'd stick with the default connection pool (Hibernate changed its default from Commons DBCP to c3p0) as I don't have any good reason to choose a non-default pool. At least non but having used DBCP before. The upgrade went pretty much without any problems so far. The only thing I can't get to work is passing properties to the underlying MySQL JDBC4Connection. Up to now, I used DBCP's

Spring + c3p0 + postgres

由 半腔热情 提交于 2019-12-23 06:09:31
问题 I am using Spring 3.0.5.RELEASE and Postgres 9.1. I am limiting a maximum number of connections in 17: <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"> <property name="driverClass" value="${database.driver}" /> <property name="jdbcUrl" value="${database.url}" /> <property name="user" value="${database.username}" /> <property name="password" value="${database.password}" /> <property name="initialPoolSize" value="3" /> <property name="minPoolSize" value="1" /> <property
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