Couldn't perform the operation setAutoCommit: You can't perform any operations on this connection. I

错误描述：java.sql.SQLException: Couldn't perform the operation setAutoCommit: You can't perform any operations on this connection. It has been automatically closed by Proxool for some reason (see logs).
    at org.logicalcobwebs.proxool.WrappedConnection.invoke(WrappedConnection.java:207)
    at org.logicalcobwebs.proxool.WrappedConnection.intercept(WrappedConnection.java:87)
    at $java.sql.Connection$$EnhancerByProxool$$c663b102.setAutoCommit(<generated>)
    at org.hibernate.transaction.JDBCTransaction.toggleAutoCommit(JDBCTransaction.java:224)
    at org.hibernate.transaction.JDBCTransaction.commitAndResetAutoCommit(JDBCTransaction.java:169)
    at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:142)
    at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:1822)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    at java.lang.Thread.run(Thread.java:662)
ERROR 2013-05-22 18:32:20,839 org.hibernate.transaction.JDBCTransaction: JDBC commit failed
java.sql.SQLException: Couldn't perform the operation commit: You can't perform any operations on this connection. It has been automatically closed by Proxool for some reason (see logs).
    at org.logicalcobwebs.proxool.WrappedConnection.invoke(WrappedConnection.java:207)
    at org.logicalcobwebs.proxool.WrappedConnection.intercept(WrappedConnection.java:87)
    at $java.sql.Connection$$EnhancerByProxool$$c663b102.commit(<generated>)
    at org.hibernate.transaction.JDBCTransaction.commitAndResetAutoCommit(JDBCTransaction.java:166)
    at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:142)
    at org.springframework.orm.hibernate3.HibernateTransactionManager.doCommit(HibernateTransactionManager.java:656)
    at org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:754)

    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1004)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
    at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:1822)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)

    at java.lang.Thread.run(Thread.java:662)

解决方法：错误的意思是说，由于某些原因连接被Proxool自动关闭，出现这种情况，一般有如下原因：

                       1.可能为连接数据库超时，比如调试时，对一个窗口停留太久。（对Lucene建立的站内搜索时，俺就出现了这个错误~）

                       2.网上的说法：

                       <proxool.minimumConnectionCount>5</proxool.minimumConnectionCount>//最小连接数
                       <proxool.maximumConnectionCount>150</proxool.maximumConnectionCount>//最大连接数
                        <proxool.simultaneousBuildThrottle>20</proxool.simultaneousBuildThrottle>//同时最大连接数

                       连接数够用，但是同时最大连接数设置的小了点，取不到连接导致报错。

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