我编Java最后的酒店管理系统时，总会出现以下错误：

java.lang.ClassNotFoundException: com.microsoft.sqlserver.jdbc.SQLServerDriver

at java.net.URLClassLoader.findClass(URLClassLoader.java:382)

at java.lang.ClassLoader.loadClass(ClassLoader.java:424)

at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)

at java.lang.ClassLoader.loadClass(ClassLoader.java:357)

at java.lang.Class.forName0(Native Method)

at java.lang.Class.forName(Class.java:264)

at com.mwq.dao.JDBC.<clinit>(JDBC.java:18)

at com.mwq.dao.BaseDao.selectSomeValue(BaseDao.java:61)

at com.mwq.dao.Dao.sUserNameOfNotFreeze(Dao.java:23)

at com.mwq.frame.LandFrame.<init>(LandFrame.java:148)

at com.mwq.DrinkeryManage.<init>(DrinkeryManage.java:16)

at com.mwq.DrinkeryManage$1.run(DrinkeryManage.java:37)

at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)

at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)

at java.awt.EventQueue.access$500(EventQueue.java:97)

at java.awt.EventQueue$3.run(EventQueue.java:709)

at java.awt.EventQueue$3.run(EventQueue.java:703)

at java.security.AccessController.doPrivileged(Native Method)

at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:74)

at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)

at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:205)

at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)

at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)

at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)

at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)

at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)

java.sql.SQLException: No suitable driver found for jdbc:sqlserver://baiweiming:1433;DatabaseName=db_DrinkeryManage1

at java.sql.DriverManager.getConnection(DriverManager.java:689)

at java.sql.DriverManager.getConnection(DriverManager.java:247)

at com.mwq.dao.JDBC.getConnection(JDBC.java:28)

at com.mwq.dao.BaseDao.selectSomeValue(BaseDao.java:61)

at com.mwq.dao.Dao.sUserNameOfNotFreeze(Dao.java:23)

at com.mwq.frame.LandFrame.<init>(LandFrame.java:148)

at com.mwq.DrinkeryManage.<init>(DrinkeryManage.java:16)

at com.mwq.DrinkeryManage$1.run(DrinkeryManage.java:37)

at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)

at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)

at java.awt.EventQueue.access$500(EventQueue.java:97)

at java.awt.EventQueue$3.run(EventQueue.java:709)

at java.awt.EventQueue$3.run(EventQueue.java:703)

at java.security.AccessController.doPrivileged(Native Method)

at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:74)

at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)

at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:205)

at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)

at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)

at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)

at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)

at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException

at com.mwq.dao.BaseDao.selectSomeValue(BaseDao.java:63)

at com.mwq.dao.Dao.sUserNameOfNotFreeze(Dao.java:23)

at com.mwq.frame.LandFrame.<init>(LandFrame.java:148)

at com.mwq.DrinkeryManage.<init>(DrinkeryManage.java:16)

at com.mwq.DrinkeryManage$1.run(DrinkeryManage.java:37)

at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)

at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)

at java.awt.EventQueue.access$500(EventQueue.java:97)

at java.awt.EventQueue$3.run(EventQueue.java:709)

at java.awt.EventQueue$3.run(EventQueue.java:703)

at java.security.AccessController.doPrivileged(Native Method)

at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:74)

at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)

at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:205)

at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)

at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)

at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)

at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)

at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)

下面的是debug之后添加的两行：

ERROR: JDWP Unable to get JNI 1.2 environment, jvm->GetEnv() return code = -2

JDWP exit error AGENT_ERROR_NO_JNI_ENV(183):  [util.c:840]

怎么办？

而且每一回只要程序中加入了一张图片就不能运行，总是超级多的错误。

求帮助！