c3p0

I keep getting this exception in my Tomcat log: com.mchange.v2.async.ThreadPoolAsynchronousRunner$DeadlockDetector run WARNING: com.mchange.v2.async.ThreadPoolAsynchronousRunner$DeadlockDetector@76b28200 -- APPARENT DEADLOCK!!! Creating emergency threads for unassigned pending tasks! com.mchange.v2.async.ThreadPoolAsynchronousRunner$DeadlockDetector run WARNING: com.mchange.v2.async.ThreadPoolAsynchronousRunner$DeadlockDetector@76b28200 -- APPARENT DEADLOCK!!! Complete Status: Managed Threads: 3 Active Threads: 3 Active Tasks: com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@1201fd18

I'm still getting JDBC timeouts after trying to configure c3p0 following all of the examples I could find. I'm using JPA, Hibernate, Tomcat, MySQL [AWS RDS]. Here's the snippet from persistence.xml: <property name="javax.persistence.jdbc.url" value="jdbc:mysql://url..." /> <property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver" /> <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect" /> <property name="connection.provider_class" value="org.hibernate.connection.C3P0ConnectionProvider"/> <property name="hibernate.c3p0.acquire_increment" value="4" />

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I am using oracle 11g,hibernate 3 and jsf2.I deployed my application on was7.Every thing is going well but when i try to login after 5-6 hours it is gives me error ERROR org.hibernate.util.JDBCExceptionReporter - Io exception: Connection reset by peer: socket write error [5/28/13 11:31:25:048 IST] 00000024 SystemErr R org.hibernate.exception.GenericJDBCException: could not execute query at org.hibernate.exception.SQLStateConverter.handledNonSpecificException(SQLStateConverter.java:126) at org.hibernate.exception.SQLStateConverter.convert

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I am using hibernate in my project and I am getting random Apparent Deadlocks for very simple database operations. There is one of the Stack Traces: https://gist.github.com/knyttl/8999006 The problem happens often on similar clauses: @Transactional public void setLastActivity() { User user = em.findById(...); user.setLastActivity(new Date()); em.merge(user); em.flush(); } I am quite stuck as I don't know whether it is problem of Hibernate, MySQL or C3P0. My Hibernate configuration: <prop key="hibernate.dialect">${database.dialect}</prop>

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I've deployed an GWT application on a Tomcat server. Everything is working fine but sometimes I get the following exception: org.hibernate.exception.JDBCConnectionException: could not extract ResultSet at com.google.gwt.user.server.rpc.RPC.encodeResponseForFailure(RPC.java:389) at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:579) at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:265) at com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(RemoteServiceServlet.java

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: In my project I started to use c3p0 with hibernate for reconnecting to database as hibernate won't restore connection on db failure. <dependency> <groupId>org.hibernate</groupId> <artifactId>hibernate-c3p0</artifactId> <version>5.2.9.Final</version> </dependency> I am using hibernate version: <dependency> <groupId>org.hibernate</groupId> <artifactId>hibernate-core</artifactId> <version>5.2.9.Final</version> </dependency> the postgresql driver is: <dependency> <groupId>org.postgresql</groupId> <artifactId>postgresql</artifactId> <version>42.1

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I use Hibernate together with MySQL 5.1.30. I have the next libraries: c3p0-0.0.1.2.jar mysql-connector-java-5.0.3-bin.jar hibernate3.jar I use a hibernate.cfg.xml for configuration: <!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> <hibernate-configuration> <session-factory> <!-- Database connection settings --> <property name="connection.driver_class">org.gjt.mm.mysql.Driver</property> <property name="connection.url">jdbc:mysql:/

转载：Hibernate的三种连接池设置C3P0、Proxool和DBCP 以下三种连接都是以连接MySQl为例。 org.gjt.mm.mysql.Driver jdbc:mysql://localhost:3306/struts?useUnicode=true&characterEncoding=GBK root 8888 上面的一段配置，在c3p0和dbcp中，都是必需的，因为hibernate会根据上述的配置来生成connections，再交给c3p0或dbcp 管理.但是，proxool则不能，虽然说服文档上说proxool也可以和hibernate结合,但我按照官方文档上的说明怎么配也出错，而且，到了 sun和hibernat有的官方网站上问了几天，都没有一个人回复。后来我只能让proxool自身来生成连接，这在下面再讲。 1 C3P0 只需在hibernate.cfg.xml中加入 5 30 1800 50 还有在classespath中加入c3p0-0.8.4.5.jar 2 dbcp 在hibernate.cfg.xml中加入 100 1 60000 10 100 1 60000 10 还有在classespath中加入commons-pool-1.2.jar 和commons-dbcp-1.2.1.jar. 3 proxool 在hibernate.cfg

We have a java server connecting to a MySQL 5 database usingHibernate as our persistence layer which is using c3p0 for DB connection pooling. I've tried following the c3p0 and hibernate documentation: Hibernate - HowTo Configure c3p0 connection pool C3P0 Hibernate properties C3P0.properties configuration We're getting an error on our production servers stating that: ... Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: No operations allowed after connection closed.Connection was implicitly closed due to underlying exception/error: BEGIN NESTED EXCEPTION com.mysql