java.lang.NoSuchMethodError：javax.el.E​​xpressionFactory.getStreamELResolver（）Ljavax / el / ELResolver;

Question

我在tomcat 8.0.33中使用java.lang.NoSuchMethodError: javax.el.ExpressionFactory.getStreamELResolver()Ljavax/el/ELResolver;时收到错误jstl。我已经检查了我的应用程序的WEB-INF / lib，但它并没有包含任何有冲突的内容。

我还从tomcat 8的lib文件夹中的javax.el.ExpressionFactory文件中检查了el-api.jar类的源代码。方法签名为public ELResolver getStreamELResolver()。

将应用程序从tomcat 6.0.35迁移到tomcat 8.0.33后发生此问题。该应用程序是使用jstl-1.2

编写的

完整的堆栈跟踪是

16-May-2016 19:14:54.119 SEVERE [ajp-nio-11009-exec-4] org.apache.catalina.core.StandardWrapperValve.invoke Servlet.service() for servlet [spring] in context with path [/app] threw exception [Request processing failed; nested exception is org.apache.tiles.impl.CannotRenderException: org.apache.tiles.util.TilesIOException: JSPException including path '/WEB-INF/JSP/APP/display.jsp'.] with root cause
 java.lang.NoSuchMethodError: javax.el.ExpressionFactory.getStreamELResolver()Ljavax/el/ELResolver;
    at org.apache.jasper.el.ELContextImpl.<clinit>(ELContextImpl.java:87)
    at org.apache.jasper.compiler.Validator$ValidateVisitor.prepareExpression(Validator.java:1617)
    at org.apache.jasper.compiler.Validator$ValidateVisitor.visit(Validator.java:750)
    at org.apache.jasper.compiler.Node$ELExpression.accept(Node.java:950)
    at org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2376)
    at org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2428)
    at org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2434)
    at org.apache.jasper.compiler.Node$Root.accept(Node.java:464)
    at org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2376)
    at org.apache.jasper.compiler.Validator.validateExDirectives(Validator.java:1853)
    at org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:217)
    at org.apache.jasper.compiler.Compiler.compile(Compiler.java:356)
    at org.apache.jasper.compiler.Compiler.compile(Compiler.java:336)
    at org.apache.jasper.compiler.Compiler.compile(Compiler.java:323)
    at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:585)
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:363)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:396)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:340)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
    at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:720)
    at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:584)
    at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:523)
    at org.apache.jasper.runtime.JspRuntimeLibrary.include(JspRuntimeLibrary.java:935)
    at org.apache.jasper.runtime.PageContextImpl.doInclude(PageContextImpl.java:679)
    at org.apache.jasper.runtime.PageContextImpl.include(PageContextImpl.java:673)
    at org.apache.tiles.jsp.context.JspTilesRequestContext.include(JspTilesRequestContext.java:103)
    at org.apache.tiles.jsp.context.JspTilesRequestContext.dispatch(JspTilesRequestContext.java:96)
    at org.apache.tiles.renderer.impl.TemplateAttributeRenderer.write(TemplateAttributeRenderer.java:44)
    at org.apache.tiles.renderer.impl.AbstractBaseAttributeRenderer.render(AbstractBaseAttributeRenderer.java:106)
    at org.apache.tiles.renderer.impl.ChainedDelegateAttributeRenderer.write(ChainedDelegateAttributeRenderer.java:76)
    at org.apache.tiles.renderer.impl.AbstractBaseAttributeRenderer.render(AbstractBaseAttributeRenderer.java:106)
    at org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:670)
    at org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:336)
    at org.apache.tiles.template.InsertAttributeModel.renderAttribute(InsertAttributeModel.java:210)
    at org.apache.tiles.template.InsertAttributeModel.end(InsertAttributeModel.java:126)
    at org.apache.tiles.jsp.taglib.InsertAttributeTag.doTag(InsertAttributeTag.java:311)

... (truncated)

如何解决此问题？

Answer 1

要解决类路径中存在的同一类的不同版本的此类问题 - 最好的方法是启用详细类加载，并查看该类是否实际上是从预期的jar文件加载的。

从命令行我们可以运行java -verbose:class MyClassWithMain。这将输出JVM中加载的所有类以及jar的名称或加载它的类路径上的任何类。找到问题的根源后，您可以将其删除。 要在tomcat中启用verbose:class，请参阅this answer。