新手问题,简单

这是个什么错误阿，要怎么样才能改正呢，我的jsp没问题阿
javax.servlet.ServletException: oracle.jdbc.driver.OracleDriver
org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:867)
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:800)
org.apache.jsp.testoracle_jsp._jspService(testoracle_jsp.java:100)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:133)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:311)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
vas.mms.filter.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:170)
root cause java.lang.ClassNotFoundException: oracle.jdbc.driver.OracleDriver
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1383)
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1230)
org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:184)
org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:110)
java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
java.lang.Class.forName0(Native Method)
java.lang.Class.forName(Class.java:164)
org.apache.jsp.testoracle_jsp._jspService(testoracle_jsp.java:48)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:133)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:311)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
vas.mms.filter.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:170)