解决Jetty下EL版本冲突的问题

今天用jetty做嵌入式web container，来做web项目的integration test，结果发现出现在渲染使用EL表达式的jsp页面时出现异常：

javax.el.ExpressionFactory.newInstance()Ljavax/el/ExpressionFactory;

Caused by: java.lang.NoSuchMethodError: javax.el.ExpressionFactory.newInstance()Ljavax/el/ExpressionFactory;

at org.apache.jasper.compiler.JspUtil.getExpressionFactory(JspUtil.java:1189)

at org.apache.jasper.compiler.JspUtil.validateExpressions(JspUtil.java:651)

at org.apache.jasper.compiler.Validator$ValidateVisitor.visit(Validator.java:760)

at org.apache.jasper.compiler.Node$ELExpression.accept(Node.java:947)

at org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2297)

at org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2347)

at org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2353)

at org.apache.jasper.compiler.Node$Root.accept(Node.java:499)

at org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2297)

at org.apache.jasper.compiler.Validator.validate(Validator.java:1882)

at org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:223)

at org.apache.jasper.compiler.Compiler.compile(Compiler.java:451)

at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:625)

at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374)

at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:492)

at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:378)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:848)

at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:594)

at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:486)

at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:119)

at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:542)

at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:233)

at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1065)

at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:413)

at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:192)

at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:999)

at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:117)

at org.eclipse.jetty.server.Dispatcher.forward(Dispatcher.java:271)

at org.eclipse.jetty.server.Dispatcher.forward(Dispatcher.java:98)

at org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:238)

at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:262)

at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1157)

at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:927)

at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:827)

at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882)

at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:778)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:735)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:848)

at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:594)

at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1366)

at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)

at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)

at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1337)

at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:484)

at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:119)

at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:524)

at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:233)

at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1065)

at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:413)

at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:192)

at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:999)

at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:117)

at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:111)

at org.eclipse.jetty.server.Server.handle(Server.java:351)

at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:454)

at org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:890)

at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:944)

at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:634)

at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:230)

at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:77)

at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:609)

at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:45)

at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:599)

at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:534)

at java.lang.Thread.run(Thread.java:619)

检查了一下，发现javax.el.ExpressionFactory.newInstance()这个方法是EL2.2版本之后才有的方法，而在EL2.1之中是没有这个方法的，问题很明显：org.apache.jasper中试图调用2.2版本的EL，当时提供的EL的版本是2.1版本，所以解决的方式无非就是两个，要不降低org.apache.jasper的版本，要不提升el的版本。考虑到现在使用的jetty已经是最新的版本8.1.2.v20120308，因此提升EL的版本为2.2更为合适。

修改pom.xml文件，将

<groupId>javax.servlet.jsp</groupId>

<scope>provided</scope>

</dependency>

修改为2.2版本，上述问题顺利解决，之前的el异常不再出现。

解决Jetty下EL版本冲突的问题

解决Jetty下EL版本冲突的问题

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