玩！框架1.2.4 --- C3P0设置，以避免通信链路故障做空闲时间

Question

我试图定制我的C3P0设置，以避免在这篇文章的底部显示的错误。

有人建议在这个网址--- http://make-it-open.blogspot.com/2008/12/sql-error-0-sqlstate-08s01.html ---如下调整设置：

hibernate.cfg.xml中，写

<property name="c3p0.min_size">5</property> 
<property name="c3p0.max_size">20</property> 
<property name="c3p0.timeout">1800</property> 
<property name="c3p0.max_statements">50</property> 

然后创建 “c3p0.properties”在你的根类路径文件夹中，并写入

c3p0.testConnectionOnCheckout=true 
c3p0.acquireRetryDelay=1000 
c3p0.acquireRetryAttempts=1 

我试着按照Play的方向进行这些调整！框架文档，他们说在那里使用“db.pool ...”如下：

db.pool.timeout=1800 
db.pool.maxSize=15 
db.pool.minSize=5 
db.pool.initialSize=5 
db.pool.acquireRetryAttempts=1 
db.pool.preferredTestQuery=SELECT 1 
db.pool.testConnectionOnCheckout=true 
db.pool.acquireRetryDelay=1000 
db.pool.maxStatements=50 

这些设置不起作用吗？我应该试图以不同的方式设置它们吗？有了这些设置，我仍然得到如下所示的错误，这是由于空闲时间过长造成的。错误的

完整的堆栈跟踪：

23:00:44,932 WARN ~ SQL Error: 0, SQLState: 08S01 
2012-04-13T23:00:44+00:00 app[web.1]: 23:00:44,932 ERROR ~ Communications link failure 
2012-04-13T23:00:44+00:00 app[web.1]: 
2012-04-13T23:00:44+00:00 app[web.1]: The last packet successfully received from the server was 274,847 milliseconds ago. The last packet sent successfully to the server was 7 milliseconds ago. 
2012-04-13T23:00:44+00:00 app[web.1]: 23:00:44,934 ERROR ~ Why the driver complains here? 
2012-04-13T23:00:44+00:00 app[web.1]: com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: No operations allowed after connection closed.Connection was implicitly closed by the driver. 
2012-04-13T23:00:44+00:00 app[web.1]: at com.mysql.jdbc.Util.handleNewInstance(Util.java:407) 
2012-04-13T23:00:44+00:00 app[web.1]: at com.mysql.jdbc.Util.getInstance(Util.java:382) 
2012-04-13T23:00:44+00:00 app[web.1]: at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1013) 
2012-04-13T23:00:44+00:00 app[web.1]: at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:987) 
2012-04-13T23:00:44+00:00 app[web.1]: at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:982) 
2012-04-13T23:00:44+00:00 app[web.1]: at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:927) 
2012-04-13T23:00:44+00:00 app[web.1]: at com.mysql.jdbc.ConnectionImpl.throwConnectionClosedException(ConnectionImpl.java:1213) 
2012-04-13T23:00:44+00:00 app[web.1]: at com.mysql.jdbc.ConnectionImpl.getMutex(ConnectionImpl.java:3101) 
2012-04-13T23:00:44+00:00 app[web.1]: at com.mysql.jdbc.ConnectionImpl.setAutoCommit(ConnectionImpl.java:4975) 
2012-04-13T23:00:44+00:00 app[web.1]: at org.hibernate.jdbc.BorrowedConnectionProxy.invoke(BorrowedConnectionProxy.java:74) 
2012-04-13T23:00:44+00:00 app[web.1]: at $Proxy49.setAutoCommit(Unknown Source) 
2012-04-13T23:00:44+00:00 app[web.1]: at play.db.jpa.JPAPlugin.closeTx(JPAPlugin.java:368) 
2012-04-13T23:00:44+00:00 app[web.1]: at play.db.jpa.JPAPlugin.onInvocationException(JPAPlugin.java:328) 
2012-04-13T23:00:44+00:00 app[web.1]: at play.plugins.PluginCollection.onInvocationException(PluginCollection.java:447) 
2012-04-13T23:00:44+00:00 app[web.1]: at play.Invoker$Invocation.onException(Invoker.java:240) 
2012-04-13T23:00:44+00:00 app[web.1]: at play.jobs.Job.onException(Job.java:124) 
2012-04-13T23:00:44+00:00 app[web.1]: at play.jobs.Job.call(Job.java:163) 
2012-04-13T23:00:44+00:00 app[web.1]: at play.jobs.Job$1.call(Job.java:66) 
2012-04-13T23:00:44+00:00 app[web.1]: at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334) 
2012-04-13T23:00:44+00:00 app[web.1]: at java.util.concurrent.FutureTask.run(FutureTask.java:166) 
2012-04-13T23:00:44+00:00 app[web.1]: at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$101(ScheduledThreadPoolExecutor.java:165) 
2012-04-13T23:00:44+00:00 app[web.1]: at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:266) 
2012-04-13T23:00:44+00:00 app[web.1]: at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110) 
2012-04-13T23:00:44+00:00 app[web.1]: at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603) 
2012-04-13T23:00:44+00:00 app[web.1]: at java.lang.Thread.run(Thread.java:636) 
2012-04-13T23:00:44+00:00 app[web.1]: Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure 

Answer 1

创建 “c3p0.properties” 内部 '的conf' 目录。

它适用于我。

我认为这是db.pool“在application.conf只读几个选项，看看游戏的源代码（DBPlugin.onApplicationStart（））：

ComboPooledDataSource ds = new ComboPooledDataSource(); 
ds.setDriverClass(p.getProperty("db.driver")); 
ds.setJdbcUrl(p.getProperty("db.url")); 
ds.setUser(p.getProperty("db.user")); 
ds.setPassword(p.getProperty("db.pass")); 
ds.setAcquireRetryAttempts(10); 
ds.setCheckoutTimeout(Integer.parseInt(p.getProperty("db.pool.timeout", "5000"))); 
ds.setBreakAfterAcquireFailure(false); 
ds.setMaxPoolSize(Integer.parseInt(p.getProperty("db.pool.maxSize", "30"))); 
ds.setMinPoolSize(Integer.parseInt(p.getProperty("db.pool.minSize", "1"))); 
ds.setMaxIdleTimeExcessConnections(Integer.parseInt(p.getProperty("db.pool.maxIdleTimeExcessConnections", "0"))); 
ds.setIdleConnectionTestPeriod(10); 
ds.setTestConnectionOnCheckin(true); 

Answer 2

idleConnectionTestPeriod不会从c3p0.properties文件中选取。因此，您需要将您的播放框架升级到1.3或1.4