issue:sql server 安装完之后，驱动，URL正确的情况下，出现http connection error
solution:打开 SQL server configuration manager > SQL Server 2005 Network Configuration > Protocols for SQLEXPRESS > TCP/IP > IP Addresses > IPALL > TCP Port > set 1433
issue:javajava.lang.OutOfMemoryError: Java heap space
solution:tomcat/bin/catalina 的首行添加类似 set JAVA_OPTS=-Xms32m -Xmx256m to increase the jvm space