Unable to compile class for JSP(不能编译class)

org.apache.jasper.JasperException: Unable to compile class for JSP:

An error occurred at line: 23 in the generated java file
The method getJspApplicationContext(ServletContext) is undefined for the type JspFactory

Stacktrace:
org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:92)
org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:330)
org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:423)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:317)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:295)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:282)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:586)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:317)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
com.challenger.core.lang.filter.EncodingFilter.doFilter(EncodingFilter.java:46)

结论：1、我的工程里的servlet.jar、jsp-servlet.jar的版本比较低与tomcat6.0相比。

2、tomcat的下面的lib里面不能与工程里面的jar相同(如果部署到tomcat上)。

3、把工程里面的两个jar包删除了，就解决了。