解决问题：Unable to compile class for JSP
java web相关的项目总是会有许多问题出现，不管是在运行期间还是运行成功之后，总是会有许多问题困扰着我们，幸好现在网络发达，许多学习爱好者会分享各自的研究成果或者解决问题的方法，我们要不怕遇到问题，遇到问题解决问题，这样才会有较大的提高。
以下是问题的所有报错信息：
HTTP Status 500 - Unable to compile class for JSP:
--------------------------------------------------------------------------------
type Exception report
message Unable to compile class for JSP:
description The server encountered an internal error that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: Unable to compile class for JSP:
An error occurred at line: [211] in the generated java file: [D:\Workspaces\work Place\workspace_B\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\work\Catalina\localhost\WFWL\org\apache\jsp\application\modules\core\leftMenu_jsp.java]
The method releaseTag(IfTag, InstanceManager, boolean) is undefined for the type JspRuntimeLibrary
An error occurred at line: [280] in the generated java file: [D:\Workspaces\work Place\workspace_B\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\work\Catalina\localhost\WFWL\org\apache\jsp\application\modules\core\leftMenu_jsp.java]
The method releaseTag(ForEachTag, InstanceManager, boolean) is undefined for the type JspRuntimeLibrary
An error occurred at line: [296] in the generated java file: [D:\Workspaces\work Place\workspace_B\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\work\Catalina\localhost\WFWL\org\apache\jsp\application\modules\core\leftMenu_jsp.java]
The method releaseTag(IfTag, InstanceManager, boolean) is undefined for the type JspRuntimeLibrary
An error occurred at line: [318] in the generated java file: [D:\Workspaces\work Place\workspace_B\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\work\Catalina\localhost\WFWL\org\apache\jsp\application\modules\core\leftMenu_jsp.java]
The method releaseTag(ForEachTag, InstanceManager, boolean) is undefined for the type JspRuntimeLibrary
An error occurred at line: [334] in the generated java file: [D:\Workspaces\work Place\workspace_B\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\work\Catalina\localhost\WFWL\org\apache\jsp\application\modules\core\leftMenu_jsp.java]
The method releaseTag(IfTag, InstanceManager, boolean) is undefined for the type JspRuntimeLibrary
An error occurred at line: [356] in the generated java file: [D:\Workspaces\work Place\workspace_B\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\work\Catalina\localhost\WFWL\org\apache\jsp\application\modules\core\leftMenu_jsp.java]
The method releaseTag(ForEachTag, InstanceManager, boolean) is undefined for the type JspRuntimeLibrary
An error occurred at line: [452] in the generated java file: [D:\Workspaces\work Place\workspace_B\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\work\Catalina\localhost\WFWL\org\apache\jsp\application\modules\core\leftMenu_jsp.java]
The method releaseTag(OutTag, InstanceManager, boolean) is undefined for the type JspRuntimeLibrary
An error occurred at line: [476] in the generated java file: [D:\Workspaces\work Place\workspace_B\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\work\Catalina\localhost\WFWL\org\apache\jsp\application\modules\core\leftMenu_jsp.java]
The method releaseTag(OutTag, InstanceManager, boolean) is undefined for the type JspRuntimeLibrary
An error occurred at line: [500] in the generated java file: [D:\Workspaces\work Place\workspace_B\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\work\Catalina\localhost\WFWL\org\apache\jsp\application\modules\core\leftMenu_jsp.java]
The method releaseTag(OutTag, InstanceManager, boolean) is undefined for the type JspRuntimeLibrary
An error occurred at line: [524] in the generated java file: [D:\Workspaces\work Place\workspace_B\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\work\Catalina\localhost\WFWL\org\apache\jsp\application\modules\core\leftMenu_jsp.java]
The method releaseTag(OutTag, InstanceManager, boolean) is undefined for the type JspRuntimeLibrary
An error occurred at line: [548] in the generated java file: [D:\Workspaces\work Place\workspace_B\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\work\Catalina\localhost\WFWL\org\apache\jsp\application\modules\core\leftMenu_jsp.java]
The method releaseTag(OutTag, InstanceManager, boolean) is undefined for the type JspRuntimeLibrary
Stacktrace:
org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:103)
org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:366)
org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:490)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:379)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:354)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:341)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:660)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:364)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)
javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
com.bupt.core.system.action.ChangePasswordFilter.doFilter(ChangePasswordFilter.java:78)
org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)
org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:259)
com.bupt.core.system.action.PrivilegeChangeFilter.doFilter(PrivilegeChangeFilter.java:95)
org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)
org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:259)
com.bupt.core.system.action.LogFilter.doFilter(LogFilter.java:321)
org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)
org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:259)
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
com.bupt.core.security.filter.MySessionHandleFilter.doFilter(MySessionHandleFilter.java:141)
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:118)
org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:84)
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
com.bupt.core.security.filter.MyFilterSecurityInterceptor.invoke(MyFilterSecurityInterceptor.java:57)
com.bupt.core.security.filter.MyFilterSecurityInterceptor.doFilter(MyFilterSecurityInterceptor.java:36)
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:113)
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:103)
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:113)
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
org.springframework.security.web.authentication.rememberme.RememberMeAuthenticationFilter.doFilter(RememberMeAuthenticationFilter.java:146)
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:54)
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:45)
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:183)
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:105)
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
org.springframework.security.web.session.ConcurrentSessionFilter.doFilter(ConcurrentSessionFilter.java:125)
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:87)
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:192)
org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:160)
org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)
org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:259)
note The full stack trace of the root cause is available in the Apache Tomcat/7.0.82 logs.
解决方法：报错时用的tomcat版本是7.0.82，错误的原因是tomcat版本过低，使用tomcat8.x即可。
over!