Question

请高手回答：HTTP Status 500 - javax.servlet.ServletException: Servlet execution threw an exception

type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception javax.servlet.ServletException: Servlet execution threw an exception
filters.TomcatFormFilter.doFilter(TomcatFormFilter.java:88)

root cause
java.lang.UnsupportedClassVersionError: Bad version number in .class file
java.lang.ClassLoader.defineClass1(Native Method)
java.lang.ClassLoader.defineClass(Unknown Source)
java.security.SecureClassLoader.defineClass(Unknown Source)
org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1817)
org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:872)
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1325)
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1204)
java.lang.ClassLoader.loadClassInternal(Unknown Source)
java.lang.Class.forName0(Native Method)
java.lang.Class.forName(Unknown Source)
dao.StudentDAO.findStudent(StudentDAO.java:17)
servlets.LoginServlet.doPost(LoginServlet.java:18)
javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
filters.TomcatFormFilter.doFilter(TomcatFormFilter.java:88)

noteThe full stack trace of the root cause is available in the Apache Tomcat/6.0.13 logs.
Apache Tomcat/6.0.13

Answer 1

配置文件有问题~

Answer 2

Bad version number in .class file
可能版本有问题

Answer 3

版本可能有问题！