c3p0

C3p0 displays 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:106)at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:65)at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:527)at com.mc

** Last packet sent to the server was 1 MS ago. Stacktrace: Com. MySQL. JDBC. communicationsexception: communications link failure due to underlying exception:I checked the MySQL documentation, the connector/J documentation, and the online description. The cause of this exception is that the default "wait_timeout" of the MySQL server is 8 hours, that is to say, if a connection is idle for more than 8 hours, MySQL will automatically disconnect the connection. This is the problem. If c3ons in

CentOS Monitor Tomcat current command line outputTail-f .../apache-tomcat-x.x.x/logs/catalina.out Main error content of C3P0 under Linux31-jul-2014 14:14:43.072 INFO [localhost-startstop-1] com.mchange.v2.c3p0.impl.C3P0ImplUtils.generateVmId Failed to Get local inetaddress for VMID. This was unlikely to matter. At all. We ll add some extra randomnessjava.net.UnknownHostException:XXX.XXX:XXX.XXX:Name or serv

1, using Org.springframework.jdbc.datasource.DriverManagerDataSource Description: Drivermanagerdatasource to establish a connection is as long as there is a connection to create a new connection, there is no connection pool role. The third way is to configure the data source in the Web server, which is not easy to deploy, and I recommend that you configure the data source in every two ways. Configure a data sourceSpring contains two implementation packages of data sources in third party d

First, a connection, introduce the difference between the various connection pools and performance differences (BONECP newer, higher performance) connection pool difference C3P0 is an open source JDBC connection pool that can be C3P0-JDBC3 Connection and Statement if the English is good pooling The version used here is c3p0-0.9.5.2: The required JDK is 1.6 or abo

connection, thus more efficient implementation of the response to the user request. Common Java-developed connection pools are mainly dbcp and c3p0. C3P0 Brief Introduction: C3P0 is an open source JDBC connection pool. It implements the data source and Jndi bindings, and supports the standard extensions of the JDBC3 specification and JDBC2. The open source proje

First, the introduction of JAR packageSecond, Java code1 @Test2 Public voidTestxml ()throwsException {3 //creating the C3P0 Connection Pool core tool class4 //automatic loading src under c3p0 profile "C3p0-config.xml"5Combopooleddatasource DataSource =NewCombopooleddatasource ();//Use the default configuration6PreparedStatement pstmt =NULL;7

What is a database connection pool:Use pools to manage connection, which can be reused with connection. With the pool, we don't have to create connection ourselves, but instead we get the connection object through the pool.When connection is finished, calling connection's close () method does not actually close the connection, but instead connection "returns" to the pool. The pool will be able to use this connection object again.Import dbutils Toolkit: Commons-dbutils-1.6.jarCommons-dbutils is a

Create a C3P0 data source, [Author]: kwu When creating a C3P0 data source, there are very few connections to the database using JDBC in actual development. Generally, the data source is used. C3P0 is an open source data source, and the actual project is used a lot: 1. Added support for maven. 2. Configure C3P0, the

Mysql Tomcat C3p0 System Performance Tuning personal summary System Information The application logic is to use c3p0 to query data in the database and return Json data over http. 1. the initial test result JMeter test result before optimization No. Type Original 1000 data bigger 1 500 Connection 250 query/S 63q/S70q/S 2 1000 connections 255q/S 57q/S65 q

Reprint: http://www.cnblogs.com/haogeBlogs/p/5856302.htmlThe most common open source data connection pools are c3p0, dbcp, and Proxool, with three of them:The Hibernate Development Group recommends the use of c3p0;Spring Development Group recommends the use of DBCP (DBCP connection pool has WebLogic connection pool the same problem, is forced to close the connection or the database restart, cannot reconnect

Tags: database connection pool C3P0 database Java JDBCC3P0 Database Connection Pool usage1. Copy jar package: C3p0-0.9.1.2.jar C3p0-0.9.1.2-jdk1.3.jar C3p0-oracle-thin-extras-0.9.1.2.jar (required by Oracle)2, write the preparation file in the SRC directory: c3p0-config.xml

Label:The most common open source data connection pools are c3p0, dbcp, and Proxool, with three of them:The Hibernate Development Group recommends the use of c3p0;Spring Development Group recommends the use of DBCP (DBCP connection pool has WebLogic connection pool the same problem, is forced to close the connection or the database restart, cannot reconnect, tell the connection is reset, this setting can be

An error occurred while connecting c3p0 to the database, Error: java. SQL. SQLException: No suitable driver Obviously, c3p0 does not find the corresponding configuration file (c3p0-config.xml or c3p0. properties), so it cannot connect to the database to report an error. Solution:

C3P0 connection pool, DBCP connection pool, C3P0 connection pool: Profile: c3p0-config.xml Test: Data preparation: CREATE DATABASE mybase;USE mybase;CREATE TABLE users(uid INT PRIMARY KEY AUTO_INCREMENT,username VARCHAR(64),upassword VARCHAR(64));INSERT INTO users (username,upassword) VALUES("zhangsan","123"),("lisi","456"),("wangwu","789");SELECT * FROM users;V

[Author]: KwuTo create a C3P0 data source, the actual development of the direct use of JDBC database connection is very small, generally using the form of data sources, C3P0 is open source data source, the actual project used a lot:1. Increase MAVEN Support2. Configurationc3p0, default configuration file C3p0-config.xml:3. Referencing a data source Package Com

In tomcat, JNDI uses the connection pool that comes with Tomcat.Discard the connection pool that comes with Tomcat. Use c3p0.Environment: Tomcat 5.5.20The following configuration is only applicable to Tomcat 5.5.x The combination of JNDI and c3p0 is as follows:C3p0: http://nchc.dl.sourceforge.net/sourceforge/c3p0/c3p0

If you configure Hibernate to connect to the database environment, we can set up an environment that uses C3P0 data sources in Hibernate, for example, in the following operations.1). Import the jar package:Hibernate-release-4.2.4.final\lib\optional\c3p0\*.jar (There are usually 3 jar packages in it .) C3p0-0.9.2.1.jarHibernate-

If you configure Hibernate to connect to the database environment, we can set up the environment for using C3P0 data source in hibernate in the following operation. 1). Import the jar package:Hibernate-release-4.2.4.final\lib\optional\c3p0\*.jar (There are usually 3 jar packages in it .) C3p0-0.9.2.1.jarHibernate-c3p0-

First step: Import the C3P0 packageStep two: Under the Classpath directory, create a C3p0-config.xml"1.0" encoding="UTF-8"?>"Checkouttimeout">30000"Idleconnectiontestperiod">30"initialpoolsize">2"MaxIdleTime">30"maxpoolsize">10"minpoolsize">2-"maxstatements">50"acquireincrement">3"Driverclass">com.mysql.jdbc.Driver"Jdbcurl">"user">root"password">1234Step three: Create a factory class to get this connection