c3p0

问题 I am new to spring, hibernate, c3p0 & ehcache. I am developing an application completely using Java Configuration except web.xml. I have to use second level cache in my app. So I added following code import net.sf.ehcache.config.CacheConfiguration; import org.springframework.cache.CacheManager; import org.springframework.cache.annotation.CachingConfigurer; import org.springframework.cache.annotation.EnableCaching; import org.springframework.cache.ehcache.EhCacheCacheManager; import org

问题 I am using Hibernate and I have configured some c3p0 properties in its config as specified in one of the hibernate documentation. Sample configuration looks like : <property name="hibernate.c3p0.min_size">5</property> <property name="hibernate.c3p0.max_size">20</property> <property name="hibernate.c3p0.timeout">300</property> <property name="hibernate.c3p0.max_statements">50</property> <property name="hibernate.c3p0.idle_test_period">3000</property> I came to know that c3p0 has many other

问题 In continuation with this Websphere hangs due to c3p0 question Our JSP application itself is a legacy code (written some 5 years back) and we need to maintain it for next 3 years. With the updates to Oracle & WAS the existing code is becoming unstable. Rewriting is not an option due to cost factors One such problem came when we had to move to Oracle 11. After some research I found out that connection pooling would help. Proper fix is to make changes to the code but cost comes into picture.

问题 My webapp works well and now I wanna add C3P0 into my webapp to manage connection pooling. Everything seems OK but I get the following error leading to bunch of exceptions: java.lang.NoSuchMethodError: org.springframework.orm.hibernate4.LocalSessionFactoryBuilder.addAnnotatedClass(Ljava/lang/Class;)Lorg/hibernate/cfg/Configuration; at org.springframework.orm.hibernate4.LocalSessionFactoryBuilder.addAnnotatedClasses(LocalSessionFactoryBuilder.java:165) at org.springframework.orm.hibernate4

问题 I'm attempting to connect to a MySQL database via JPA on a JBoss server. I get the following exception when deploying my project. 13:04:41,035 ERROR [org.jboss.msc.service.fail] (MSC service thread 1-1) MSC00001: Failed to start service jboss.persistenceunit."dryrun.war#dbname": org.jboss.msc.service.StartException in service jboss.persistenceunit."dryrun.war#dbname": Failed to start service at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1767) [jboss

问题 After upgrading to hibernate 4.2.4 from 3.6 database connections are not returned to pool after initialisation of lazy collection. As a result connection pool is exhausted very quickly when number of users exceeds number of connections in the pool. Similar symptoms are described in HHH-4808 but we haven't observed these problems in Hibernate 3.1-3.6 Relevant settings: hibernate.connection.autocommit=true hibernate.connection.release_mode=after_transaction After collection is initialized there

问题 I'm working on an OSGi application using Karaf. This application connects to a postgresql database using Hibernate 4.3. My application works when I use the hibernate default connection pool but JBoss advices not to use it on a prod system. So I'm trying to use a c3p0 connection pool. I use the following bundles: <bundle wrap="yes">hibernate-jpa-2.1-api-1.0.0.Final</bundle> <bundle wrap="no">hibernate-core-4.3.7.Final</bundle> <bundle wrap="no">hibernate-entitymanager-4.3.7.Final</bundle>

问题 I am using Postgresql as my underlying Database and and letting Spring managed my DataSource/Connection pool. The configuration I have is this <bean id="clientDataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close"> <property name="driverClass" value="org.postgresql.Driver"/> <property name="jdbcUrl" value="jdbc:postgresql://localhost:5432/genesis_cms"/> <property name="user" value="user"/> <property name="password" value="password"/> </bean> <bean id=

问题 I am working on a web project in which i have used c3p0 in web services.I have configured the following pararamters in hibernate.cfg.xml file.But even though i have given max_size is 10000 and idle test period is 30 ,Sometimes mysql server is not providing another connection to db.So the website is getting load and load till i restart my server.And my in log shows "too many conection are opened".What i miss in the following configuration.Please help me out <property name="hibernate.c3p0.min

问题 I am developing a tool that receives different connection parameters to test values in different databases (a plugin for Nagios in jNRPE that keeps an open connection to different databases). Because the configuration is dynamic (there could be more databases or they can be removed) I cannot have a configuration file. I want to know if I should have an instance of C3P0 per database or can I use the same instance and just change the URL each time I ask for a connection? The code is at github: