Question

我从spring控制器返回数据如下：

    HashMap hm = new HashMap();
    hm.put("totalPage", pageQuery.count());
    ArrayList al = new ArrayList();
    while(iterator.hasNext()){
        Vertex v = iterator.next();
        MyPageList myPageList = new MyPageList();
        myPageList.setPageName(....);
        al.add(myPageList);
    }
    hm.put("pages", al);
    ...
    ...
    HashMap hm2=new HashMap();
    hm2.put("mydata",hm);
    return hm2;

在jsp端如果我使用${mydata['totalPage']}，当我尝试迭代pages时，它会打印值bu：

<c:forEach items="${mydata['pages']}" var="v">  
</c:forEach>

它显示以下异常：

javax.servlet.ServletException: java.lang.AbstractMethodError: javax.servlet.jsp.PageContext.getELContext()Ljavax/el/ELContext;

如何显示pages值

这是我的POM文件

http://maven.apache.org/xsd/maven-4.0.0.xsd“＆GT; 4.0.0

<groupId>com.xyz</groupId>
<artifactId>abcde</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>war</packaging>

<name>hello world</name>

<properties>
    <spring.version>3.2.4.RELEASE</spring.version>        
</properties>
<dependencies>
    <!-- spring -->
    <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>${spring.version}</version>
    </dependency>
    <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>${spring.version}</version>
    </dependency>
    <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
            <version>${spring.version}</version>
    </dependency>
    <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>${spring.version}</version>
    </dependency>
    <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>${spring.version}</version>
    </dependency>
    <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context-support</artifactId>
            <version>${spring.version}</version>
    </dependency>

    <!-- spring security -->
    <dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-config</artifactId>
            <version>3.1.4.RELEASE</version>
    </dependency>
    <dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-core</artifactId>
            <version>3.1.4.RELEASE</version>
    </dependency>            
    <dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-web</artifactId>
            <version>3.1.4.RELEASE</version>
    </dependency>
    <dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-taglibs</artifactId>
            <version>3.1.4.RELEASE</version>
    </dependency>

<!-- javax mail -->
<dependency>
        <groupId>javax.mail</groupId>
        <artifactId>javax.mail-api</artifactId>
        <version>1.5.0</version>
</dependency>
<dependency>
        <groupId>javax.mail</groupId>
        <artifactId>mail</artifactId>
        <version>1.4.7</version>
</dependency>
<dependency>
        <groupId>javax.mail</groupId>
        <artifactId>mailapi</artifactId>
        <version>1.4.3</version>
</dependency>
<dependency>
        <groupId>com.sun.mail</groupId>
        <artifactId>javax.mail</artifactId>
        <version>1.5.0</version>
</dependency>

<!-- Cassandra dependency -->
<dependency>
  <groupId>org.apache.cassandra</groupId>
  <artifactId>cassandra-thrift</artifactId>
  <version>2.0.0</version>
</dependency>
<dependency>
  <groupId>org.apache.cassandra</groupId>
  <artifactId>cassandra-clientutil</artifactId>
  <version>2.0.0</version>
</dependency>            
<dependency>
  <groupId>com.datastax.cassandra</groupId>
  <artifactId>cassandra-driver-core</artifactId>
  <version>2.0.0-rc2</version>
</dependency>       
<dependency>
  <groupId>com.yammer.metrics</groupId>
  <artifactId>metrics-core</artifactId>
  <version>2.2.0</version>
</dependency>
<dependency>
  <groupId>org.apache.thrift</groupId>
  <artifactId>libthrift</artifactId>
  <version>0.9.1</version>
</dependency>
<dependency>
    <groupId>log4j</groupId>
    <artifactId>log4j</artifactId>
    <version>1.2.16</version>
</dependency>
<dependency>
    <groupId>commons-fileupload</groupId>
    <artifactId>commons-fileupload</artifactId>
    <version>1.3</version>
</dependency>

<!-- Titan dependency -->
<dependency>
   <groupId>com.thinkaurelius.titan</groupId>
   <artifactId>titan-core</artifactId>
   <version>0.4.2</version>
</dependency>   
<dependency>
   <groupId>com.thinkaurelius.titan</groupId>
   <artifactId>titan-cassandra</artifactId>
   <version>0.4.2</version>
</dependency>
<dependency>
   <groupId>com.thinkaurelius.titan</groupId>
   <artifactId>titan-all</artifactId>
   <version>0.4.2</version>
</dependency>        


<!-- jstl -->
<dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>jstl</artifactId>
        <version>1.2</version>
</dependency>        
</dependencies>

<build>
    <finalName>SpringMVC</finalName>
    <plugins>
        <plugin>
            <artifactId>maven-compiler-plugin</artifactId>
            <configuration>
                <source>1.6</source>
                <target>1.6</target>
            </configuration>
        </plugin>
    </plugins>
</build>

Answer 1

java.lang.AbstractMethodError: javax.servlet.jsp.PageContext.getELContext()Ljavax/el/ELContext;

方法javax.servlet.jsp.PageContext.getELContext()是在JSP 2.1中引入的。 AbstractMethodError基本上意味着运行时类路径包含与JSP 2.1兼容的API，但是包含旧版本的实现，例如JSP 2.0,1.2等。

通常，JSP API和实现都是已经由您部署Web应用程序的目标servletcontainer提供，例如Tomcat。通常，您不需要乱用其库或类路径。

此异常意味着您这样做了。此异常表明您有一些不明原因在webapp的运行时类路径中放置了较新版本的JSP API或较旧的版本化JSP实现，很可能是webapp的/WEB-INF/lib中的JAR文件的风格。这就是许多初学者在他们的IDE项目中遇到编译错误时错误地做了什么，并且根本不了解IDE项目的“Targeted runtime”设置实际意味着什么。

您应该从不将任意下载的特定于servlet容器的JAR文件放在您的webapp /WEB-INF/lib中，该文件最初源自与目标servletcontainer完全不同的make / version的servlet容器。它会使您的webapp与您实际要部署到的目标servletcontainer不兼容。相反，您应该设置/修复“Targeted runtime”设置，让IDE指出您要部署到的目标servletcontainer。

另见：

How do I import the javax.servlet API in my Eclipse project?

Answer 2

首先，感谢@BalusC的回答;我从中学到了东西。

当您使用JSTL1.2时，可能是容器版本与JSTL版本不匹配：

答案：https://stackoverflow.com/a/542454/2906290

来自http://www.coderanch.com/how-to/java/JstlTagLibDefinitions：

JSTL 1.2 由两个文件组成（jstl-impl-1.2.jar和jstl-api-1.2.jar）（...）应该用于JSP 2.1容器< / strong>例如Tomcat 6.

如果情况并非如此，这个案子可能会给出一个提示，因为他得到了同样的错误，但是我不确定他是否对他的方法是正确的，因为我不确定他是否真的修改了版本，或者为什么他无法降级JSTL或升级容器： https://stackoverflow.com/a/15259704/2906290

java.lang.AbstractMethodError：javax.servlet.jsp.PageContext.getELContext（）Ljavax / el / ELContext

2 个答案:

另见：