java - How to set SQL Server Connection pool size -

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i using hibernate java web application , want set limit sql server 2005 connection pool size. far have read have use connection string. can specify in hibernate.properties or in hibernate.cfg.xml? there mandatory fields or can specify max pool size?

edit: reproduce error came production machine:

2011-02-07 17:52:00,282 error [stderr] [warn] jdbcexceptionreporter - sql error: 0, sqlstate: 08s01 2011-02-07 17:52:00,282 error [stderr] [error] jdbcexceptionreporter - i/o error: connection reset peer: socket write error 2011-02-07 17:52:00,282 error [stderr] [error] jdbctransaction - jdbc rollback failed <java.sql.sqlexception: invalid state, connection object closed.>java.sql.sqlexception: invalid state, connection object closed.     @ net.sourceforge.jtds.jdbc.connectionjdbc2.checkopen(connectionjdbc2.java:1634)     @ net.sourceforge.jtds.jdbc.connectionjdbc2.rollback(connectionjdbc2.java:2027)     @ org.hibernate.transaction.jdbctransaction.rollbackandresetautocommit(jdbctransaction.java:183)     @ org.hibernate.transaction.jdbctransaction.rollback(jdbctransaction.java:162)

if you're using e.g., c3p0 can configure pool size maxpoolsize property, e.g.: 

<bean id="datasource" class="com.mchange.v2.c3p0.combopooleddatasource" destroy-method="close">     <property name="driverclass" value="...." />     <property name="jdbcurl" value="..."/>     <property name="maxpoolsize" value="..." /> </bean>

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