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Error Showing Data Base Data with Spring MVC

开发者 https://www.devze.com 2023-01-12 17:31 出处：网络
Im so grateful of the help this community has offered on my learning and production experience, i come to you with another question, thank you in advance.
相关专题：jstlspring

Im so grateful of the help this community has offered on my learning and production experience, i come to you with another question, thank you in advance.

Ok, i have a Flex + Spring + Hibernate + Tomcat + Mysql application that has been in development for 3 years. So now i need to add some html views on them. So what i intend to do is plug the jstl/jsp part of the spring framework to the project.

All the logic of the application is called from the view (flex) through one controller called CatalogFacadeImpl. So what i intend to do is create a bunch of controllers that call the method of CatalogFacadeImpl and throws the results to the new jstl views.

Problem is i´m having trouble connecting the mvc Controller Class, ModelAndView data to the jsp/jstl file.

Right now, in tests im making, i have the controller call the CatalogFacadeImpl like this:

public class Welcome implements Controller {

    private String successView;
    public static final String MAP_KEY = "categorias";
    private CatalogFacadeImpl catalogFacadeImpl ;



    public ModelAndView handleRequest(
               HttpServletRequest request,
               HttpServletResponse response) throws Exception
       {

           List lista = catalogFacadeImpl.getUserList();

           return new ModelAndView(getSuccessView(),MAP_KEY,lista);

       }

    public String getSuccessView() {
        return successView;
    }

    public void setSuccessView(String successView) {
        this.successView = successView;
    }

    public void setCatalogFacadeImpl(CatalogFacadeImpl catalog){
        this.catalogFacadeImpl = catalog;
    }
}

Which when i debug it , lista brings the right objects with the data! so it works!

The view without jstl works fine also, however when i add the code that should bring me the ModelAndView Success info i get the error :( here is the code (note, the html code doen't show right because of the editor, but it´s and html with the jstl code added):

taglib prefix="c" uri="http://java.sun.com/jstl/core"  
<html>
  <head><title>Example :: Spring Application</title></head>
  <body>
    <h1>Example - Spring Application</h1>
    <p>Lista de usuarios</p>
  <c:forEach items="${lista}" var="lista">
                <tr>

                    <c:out value="${lista.userName}" />
                        <div></div>
                        </td>
                    </tr>
                </c:forEach>
  </body>
</html>

And error i get:

<html><head><title>Apache Tomcat/5.5.26 - Informe de Error</title><style><!--H1 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:22px;} H2 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:16px;} H3 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:14px;} BODY {font-family:Tahoma,Arial,sans-serif;color:black;background-color:white;} B {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;} P {font-family:Tahoma,Arial,sans-serif;background:white;color:black;font-size:12px;}A {color : black;}A.name {color : black;}HR {color : #525D76;}--></style> </head><body><h1>Estado HTTP 500 - </h1><hr noshade="noshade" size="1"><p><b>type</b> Informe de Excepción</p><p><b>mensaje</b> <u></u></p><p><b>descripción</b> <u>El servidor encontró un error interno () que hizo que no pudiera rellenar este requerimiento.</u></p><p><b>excepción</b> </p><pre>javax.servlet.ServletException: javax/el/ValueExpression
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:273)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
    org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:142)
    org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:239)
    org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1142)
    org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:879)
    org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:792)
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:476)
    org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:431)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
    javax.servlet.http.开发者_Python百科HttpServlet.service(HttpServlet.java:803)
</pre><p></p><p><b>causa raíz</b> </p><pre>java.lang.NoClassDefFoundError: javax/el/ValueExpression
    java.lang.Class.getDeclaredMethods0(Native Method)
    java.lang.Class.privateGetDeclaredMethods(Class.java:2427)
    java.lang.Class.getDeclaredMethods(Class.java:1791)
    java.beans.Introspector$1.run(Introspector.java:1272)
    java.security.AccessController.doPrivileged(Native Method)
    java.beans.Introspector.getPublicDeclaredMethods(Introspector.java:1270)
    java.beans.Introspector.getTargetMethodInfo(Introspector.java:1136)
    java.beans.Introspector.getBeanInfo(Introspector.java:387)
    java.beans.Introspector.getBeanInfo(Introspector.java:159)
    java.beans.Introspector.getBeanInfo(Introspector.java:220)
    java.beans.Introspector.&lt;init&gt;(Introspector.java:368)
    java.beans.Introspector.getBeanInfo(Introspector.java:159)
    java.beans.Introspector.getBeanInfo(Introspector.java:220)
    java.beans.Introspector.&lt;init&gt;(Introspector.java:368)
    java.beans.Introspector.getBeanInfo(Introspector.java:159)
    org.apache.jasper.compiler.Generator$TagHandlerInfo.&lt;init&gt;(Generator.java:3729)
    org.apache.jasper.compiler.Generator$GenerateVisitor.getTagHandlerInfo(Generator.java:2132)
    org.apache.jasper.compiler.Generator$GenerateVisitor.visit(Generator.java:1600)
    org.apache.jasper.compiler.Node$CustomTag.accept(Node.java:1442)
    org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2166)
    org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2216)
    org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2222)
    org.apache.jasper.compiler.Node$Root.accept(Node.java:457)
    org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2166)
    org.apache.jasper.compiler.Generator.generate(Generator.java:3321)
    org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:199)
    org.apache.jasper.compiler.Compiler.compile(Compiler.java:296)
    org.apache.jasper.compiler.Compiler.compile(Compiler.java:277)
    org.apache.jasper.compiler.Compiler.compile(Compiler.java:265)
    org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:564)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:302)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:329)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
    org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:142)
    org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:239)
    org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1142)
    org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:879)
    org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:792)
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:476)
    org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:431)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:803)

</pre><p></p><p><b>causa raíz</b> </p><pre>java.lang.ClassNotFoundException: javax.el.ValueExpression
    org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1363)
    org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1209)
    java.lang.ClassLoader.loadClassInternal(ClassLoader.java:374)
    java.lang.Class.getDeclaredMethods0(Native Method)
    java.lang.Class.privateGetDeclaredMethods(Class.java:2427)
    java.lang.Class.getDeclaredMethods(Class.java:1791)
    java.beans.Introspector$1.run(Introspector.java:1272)
    java.security.AccessController.doPrivileged(Native Method)
    java.beans.Introspector.getPublicDeclaredMethods(Introspector.java:1270)
    java.beans.Introspector.getTargetMethodInfo(Introspector.java:1136)
    java.beans.Introspector.getBeanInfo(Introspector.java:387)
    java.beans.Introspector.getBeanInfo(Introspector.java:159)
    java.beans.Introspector.getBeanInfo(Introspector.java:220)
    java.beans.Introspector.&lt;init&gt;(Introspector.java:368)
    java.beans.Introspector.getBeanInfo(Introspector.java:159)
    java.beans.Introspector.getBeanInfo(Introspector.java:220)
    java.beans.Introspector.&lt;init&gt;(Introspector.java:368)
    java.beans.Introspector.getBeanInfo(Introspector.java:159)
    org.apache.jasper.compiler.Generator$TagHandlerInfo.&lt;init&gt;(Generator.java:3729)
    org.apache.jasper.compiler.Generator$GenerateVisitor.getTagHandlerInfo(Generator.java:2132)
    org.apache.jasper.compiler.Generator$GenerateVisitor.visit(Generator.java:1600)
    org.apache.jasper.compiler.Node$CustomTag.accept(Node.java:1442)
    org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2166)
    org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2216)
    org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2222)
    org.apache.jasper.compiler.Node$Root.accept(Node.java:457)
    org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2166)
    org.apache.jasper.compiler.Generator.generate(Generator.java:3321)
    org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:199)
    org.apache.jasper.compiler.Compiler.compile(Compiler.java:296)
    org.apache.jasper.compiler.Compiler.compile(Compiler.java:277)
    org.apache.jasper.compiler.Compiler.compile(Compiler.java:265)
    org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:564)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:302)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:329)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
    org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:142)
    org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:239)
    org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1142)
    org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:879)
    org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:792)
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:476)
    org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:431)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
</pre><p></p><p><b>nota</b> <u>La traza completa de la causa de este error se encuentra en los archivos de diario de Apache Tomcat/5.5.26.</u></p><hr noshade="noshade" size="1"><h3>Apache Tomcat/5.5.26</h3></body></html>

Smells like a classloader problem.

javax.el.ValueExpression only appeared in JSP 2.1, and Tomcat 5.5 only supports JSP 2.0 (see version matrix).

Something is clearly asking for javax.el.ValueExpression, though, and I suspect you've packaged a copy of the JSTL, JSP and/or Servlet libraries in your WAR somewhere - those libraries may be for a newer version of JSP, and they'll clash with Tomcat's own libraries. Have a look to see if that's the case, and if so, remove the library from the WAR.

Also, your JSTL declaration is out of date. It should be

http://java.sun.com/jsp/jstl/core

not

http://java.sun.com/jstl/core (this is the old, pre-JSP 2.0 URI).

Based on this forum, I think you might be bundling a conflicting servlet-api.jar with your code.

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