<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
        <property name="entityManagerFactory" ref="entityManagerFactory" />
          <property name="defaultTimeout" value="400" />
    </bean>

int timeout = determineTimeout(definition);
            if (timeout != -1) {
                txObject.getConnectionHolder().setTimeoutInSeconds(timeout);
            }


public void setTimeoutInSeconds(int seconds) {
        setTimeoutInMillis(seconds * 1000);
        public void setTimeoutInMillis(long millis) {
        this.deadline = new Date(System.currentTimeMillis() + millis);
    }
}