使用hibernate3 时，把所有jar包全部加进去了，报如下错误：
Servlet.service() for servlet StudentTestServlet threw exception
java.lang.NoClassDefFoundError:
org/slf4j/impl/StaticLoggerBinder
at
org.slf4j.LoggerFactory.getSingleton(LoggerFactory.java:223)
at
org.slf4j.LoggerFactory.bind(LoggerFactory.java:120)
at
org.slf4j.LoggerFactory.performInitialization(LoggerFactory.java:111)
at
org.slf4j.LoggerFactory.getILoggerFactory(LoggerFactory.java:269)
at
org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:242)
at
org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:255)
at
org.hibernate.cfg.Configuration.<clinit>(Configuration.java:165)
at
servlet.StudentTestServlet.doGet(StudentTestServlet.java:53)
at
javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
at
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter
解决方法：
1、添加一个slf4j-nop-1.6.0.jar包
2、把slf4j-api-1.5.2.jar 换成 slf4j-api-1.6.0.jar
因为slf4j-api-1.5.2.jar 中只提供了接口，没有实现类，实现类在slf4j-nop-1.6.0.jar包中
slf4j包下载地址：slf4j-1.6.0.zip