See [this question on Stack Overflow](http://stackoverflow.com/questions/27187435/how-to-change-bitronix-jms-pool-parameters). You have to do this at the moment: ``` java @Bean public XAConnectionFactoryWrapper xaConnectionFactoryWrapper() { return new XAConnectionFactoryWrapper() { @Override public ConnectionFactory wrapConnectionFactory( XAConnectionFactory connectionFactory) { PoolingConnectionFactoryBean pool = new PoolingConnectionFactoryBean(); pool.setConnectionFactory(connectionFactory); pool.setMaxPoolSize(50); return pool; } }; } ```