c3p0

I have my Spring Hibernate web application running on MySQL that gives me trouble. I have searched around and tried different configurations, read quite a few threads on this website, but it still pops up its smiling head. The error message is: Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: The last packet successfully received from the server was 63,313,144 milliseconds ago. The last packet sent successfully to the server was 63,313,144 milliseconds ago. is longer than the server configured value of 'wait_timeout'. You should consider either expiring and/or testing

I'm using for example c3p0 with some defined "maxStatements" for preparedStatement caching. What does this caching really do? What kind of data it caches. On what level (db, application,..)? It will be nice to understand it from example. For example i have a query select * from sometable where somecolumn=? Now i send it in prepared statement that is not cached. And now i'm sending it and it is cached. What the difference. What happened in the first case and in the second. What is sent to DB server in the first case and in the second? Thanks. Without caching, you will get a new

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 have a threaded chat server application which requires MySQL authencation. Is the best way to have 1 class create the MySQL connection, keep that connection open and let every thread use that connection but use own Query handler? Or is it better to have all threads make a seperate connection to MySQL to authencate? Or is it better to let 1 class handle the queries AND connections? We are looking at a chatserver that should be able to handle upto 10.000 connections/users. I am now using c3p0, and I created this: public static void main

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: We are facing APPARENT DEADLOCK while using c3p0 0.9.5.1 ( which is latest version of c3p0). following is the connection pool config we are using. p:driverClass="${app.jdbc.driverClassReplica}" p:jdbcUrl="jdbc:mysql://database,database/dbname" p:acquireIncrement="5" p:idleConnectionTestPeriod="300" p:maxPoolSize="100" p:maxStatements="2000" p:minPoolSize="10" p:maxIdleTime="1800" p:maxConnectionAge="3600" p:maxIdleTimeExcessConnections="20" p:numHelperThreads="15" p:preferredTestQuery="SELECT 1"/> and Following are the logs

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 built an application and deployed locally ... and it was working perfectly. I deployed it on a remote server and started getting the exception mentioned in the subject line. It's not because of any firewall issues. I changed my hibernate.xml to connect via my IP address rather then localhost and now I get the same timeouts on my locally deployed application. I get this error when I keep the application running for more than one day. I am not performing any operations after committing transactions or closing sessions myself. I am using the

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 having an Spring MVC + Mysql (JDBC 4) + c3p0 0.9.2 project. In c3p0 maxIdleTime value is 240 (i.e 4 mins.) and wait_timeout in my.ini of Mysql to 30 seconds. According to c3p0 maxIdleTime: (Default: 0) Seconds a Connection can remain pooled but unused before being discarded. Zero means idle connections never expire. According to Mysql wait_timeout: The number of seconds the server waits for activity on a noninteractive connection before closing it. Now i am having some douts on this:(some answers are known to me,Just wated to be sure I

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 3, c3p0 9.1.2, Oracle 11g in my application. If I restart the Oracle then the stale connections are not getting refresh and I am getting exception "java.sql.SQLRecoverableException: Closed Connection". Below is my hibernate.cfg.xml. I am a beginner in Hibernate API. Can you please suggest how to configure hibernate to automatically refresh the stale connections on a specified time. Here is my hibernate.cfg.xml oracle.jdbc.driver.OracleDriver jdbc:oracle:thin:@localhost:1521:ems emsman <property name="hibernate.c3p0.idle

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 getting the following java.lang.ClassCastException: com.mchange.v2.c3p0.impl.NewProxyConnection when the following code executes. could you please help me how to solve. ComboPooledDataSource connPool = new ComboPooledDataSource(); connPool .setJdbcUrl(PropertyReader.getSystemProperty(DB_URL)); connPool .setUser(PropertyReader.getSystemProperty(DB_USER)); connPool .setPassword(Decryption.getDecryptedPwd(DB_PASSWORD)); connPool .setMaxPoolSize(MAX_POOL_SIZE); connPool .setMaxIdleTime(MAX_IDLE_TIME); connPool .setMinPoolSize(MIN_POOL_SIZE)