使用JSTL访问从Spring Controller到JSP的Map时出错

2024-03-23 10:54:10

我有一个弹簧控制器,我在其中返回一个名为“model”的Map; model包含一些值,但重要的是还包含一个ArrayList.现在我将这个Map返回给我的JSP,同时在我的JSP中使用JSTL来获取ArrayList它会引发错误.

<c:forEach items="${model.result}" var="data" varStatus="status"> <!-- result is my ArrayList -->
    <c:out value="${data.url}" /> <!-- here url is data inside my result arraylist -->
</c:forEach>

生成的错误是：

root cause 

java.lang.NoSuchMethodError: javax.servlet.jsp.PageContext.getELContext()Ljavax/el/ELContext;
    at javax.servlet.jsp.jstl.core.LoopTagSupport.unExposeVariables(LoopTagSupport.java:587)
    at javax.servlet.jsp.jstl.core.LoopTagSupport.doFinally(LoopTagSupport.java:323)
    at jsp_servlet._jsp.__searchsuccess._jsp__tag3(__searchsuccess.java:294)
    at jsp_servlet._jsp.__searchsuccess._jspService(__searchsuccess.java:137)
    at weblogic.servlet.jsp.JspBase.service(JspBase.java:34)

它在Tomcat服务器上运行正常但是当我在Weblogic(9.2)服务器上部署它时会出错.我的类路径条目是：

<classpathentry kind="con" path="org.eclipse.jst.j2ee.internal.web.container"/>
    <classpathentry kind="con" path="org.eclipse.jst.j2ee.internal.module.container"/>
    <classpathentry kind="lib" path="WebContent/WEB-INF/lib/commons-fileupload-1.1.1.jar"/>
    <classpathentry kind="lib" path="WebContent/WEB-INF/lib/commons-io-1.2.jar"/>
    <classpathentry kind="lib" path="WebContent/WEB-INF/lib/commons-logging-1.1.1.jar"/>
    <classpathentry kind="lib" path="WebContent/WEB-INF/lib/hibernate-validator-4.0.2.GA.jar"/>
    <classpathentry kind="lib" path="WebContent/WEB-INF/lib/log4j-1.2.14.jar"/>
    <classpathentry kind="lib" path="WebContent/WEB-INF/lib/slf4j-api-1.5.6.jar"/>
    <classpathentry kind="lib" path="WebContent/WEB-INF/lib/slf4j-log4j12-1.5.6.jar"/>
    <classpathentry kind="lib" path="WebContent/WEB-INF/lib/spring-asm-3.0.3.RELEASE.jar"/>
    <classpathentry kind="lib" path="WebContent/WEB-INF/lib/spring-beans-3.0.3.RELEASE.jar"/>
    <classpathentry kind="lib" path="WebContent/WEB-INF/lib/spring-context-3.0.3.RELEASE.jar"/>
    <classpathentry kind="lib" path="WebContent/WEB-INF/lib/spring-core-3.0.3.RELEASE.jar"/>
    <classpathentry kind="lib" path="WebContent/WEB-INF/lib/spring-expression-3.0.3.RELEASE.jar"/>
    <classpathentry kind="lib" path="WebContent/WEB-INF/lib/spring-web-3.0.3.RELEASE.jar"/>
    <classpathentry kind="lib" path="WebContent/WEB-INF/lib/spring-webmvc-3.0.3.RELEASE.jar"/>
    <classpathentry kind="lib" path="WebContent/WEB-INF/lib/validation-api-1.0.0.GA.jar"/>
    <classpathentry kind="lib" path="WebContent/WEB-INF/lib/log4j-1.2.9.jar"/>
    <classpathentry kind="lib" path="WebContent/WEB-INF/lib/servlet-2.3.jar"/>
    <classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/jre6">
        <attributes>
            <attribute name="owner.project.facets" value="jst.java"/>
        </attributes>
    </classpathentry>
    <classpathentry kind="lib" path="WebContent/WEB-INF/lib/jstl-1.2.jar"/>
    <classpathentry kind="output" path="WebContent/WEB-INF/classes"/>

更新：我已删除jstl-1.2.jar,现在我收到编译错误：

searchsuccess.jsp:1:5: No tag library could be found with this URI. Possible causes could be that the URI is incorrect, or that there were errors during pa
rsing of the .tld file.
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
    ^----^
searchsuccess.jsp:1:5: No tag library could be found with this URI. Possible causes could be that the URI is incorrect, or that there were errors during pa
rsing of the .tld file.
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
    ^----^

        at weblogic.servlet.jsp.JavelinxJSPStub.compilePage(JavelinxJSPStub.java:298)
        at weblogic.servlet.jsp.JspStub.prepareServlet(JspStub.java:200)
        at weblogic.servlet.jsp.JspStub.prepareServlet(JspStub.java:164)
        at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:235)
        at weblogic.servlet.internal.ServletStubImpl.onAddToMapException(ServletStubImpl.java:394)

解决方法:

根据堆栈跟踪,

java.lang.NoSuchMethodError: javax.servlet.jsp.PageContext.getELContext()Ljavax/el/ELContext;
    at javax.servlet.jsp.jstl.core.LoopTagSupport.unExposeVariables(LoopTagSupport.java:587)

JSTL< c：forEach> tag期望方法PageContext#getELContext().此方法在JSP 2.1中引入.因此,此异常表明您正在使用JSTL 1.2,而您的容器不支持JSP 2.1,或者您使用不支持JSP 2.1的容器的servletcontainer特定JSP库散布了运行时类路径.运行时类路径包括webapp的/ WEB-INF / lib文件夹和Java的JRE / lib和JRE / lib / ext文件夹.

你永远不应该把servletcontainer特定的库放在那些文件夹中,例如jsp-api.jar,servlet-api.jar,el-api.jar,j2ee.jar,javaee.jar等等.你通常使用那些文件请参阅servletcontainer本身的/ lib文件夹.例如. Tomcat的/ lib目录下.它使您的webapp无法移植到目标servlet容器.您运行此webapp的目标servletcontainer已经具有这些库.如果您这样做是为了克服JSP / Servlet包上的编译错误,那么您应该以不同的方式解决它.另见How do I import the javax.servlet API in my Eclipse project?

更新：根据您的更新,您使用的是Weblogic 9.2,它是一个Servlet 2.4 / JSP 2.0容器.它根本不支持JSP 2.1 / JSTL 1.2.您需要删除JSTL 1.2库.如果我没有弄错的话,Weblogic已经提供了JSTL 1.1.否则,您需要自己将其包含在类路径(/ WEB-INF / lib文件夹)中.您可以在our JSTL wiki page找到JSTL 1.1下载链接.

码农公寓

相关文章