Jsp servlet异常 [英] Jsp servlet exception

问题描述

我也看到了一些类似的答案，但我觉得我的情况有所不同。我正在开发一个迄今为止运行良好的Spring MVC应用程序，那就是我在项目中包含hadoop api，当我包含hadoop时，此异常开始发生，当我尝试打开之前工作的初始仪表板页面时：

  java.lang.AbstractMethodError：javax.servlet.jsp.JspFactory.getJspApplicationContext（Ljavax / servlet / 
 ServletContext;）Ljavax / servlet / JSP / JspApplicationContext; 
 org.apache.jsp.ServerInfo_jsp._jspInit（ServerInfo_jsp.java:63）
 org.apache.jasper.runtime.HttpJspBase.init（HttpJspBase.java:52）
 org.apache。 jasper.servlet.JspServletWrapper.getServlet（JspServletWrapper.java:158）
 org.apache.jasper.servlet.JspServletWrapper.service（JspServletWrapper.java:328）
 org.apache.jasper.servlet.JspServlet。 serviceJspFile（JspServlet.java:336）
 org.apache.jasper.servlet.JspServlet.service（JspServlet.java:265）
 javax.servlet.http.HttpServlet.service（HttpServlet.java:803） 
 org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter（ReplyHeaderFilter.java:9 
  

<

 <依赖项> 
< groupId> org.apache这是我的hadoop依赖关系的样子。 .hadoop< / groupId> 
< artifactId> hadoop-client< / artifactId> 
< version> 0.23.1-mr1-cdh4.0.0b2< / version> 
<依赖关系> 
< d ependency> 
< groupId> org.apache.hadoop< / groupId> 
< artifactId> hadoop-core< / artifactId> 
< version> 0.23.1-mr1-cdh4.0.0b2< / version> 
<排除项> 
<排除> 
< groupId> org.mortbay.jetty< / groupId> 
< artifactId> jetty< / artifactId> 
< /排除> 
<排除> 
< groupId> javax.servlet< / groupId> 
< artifactId> servlet-api< / artifactId> 
< /排除> 
< /排除> 
< /依赖关系> 
  

一旦我将它添加到我的应用程序中，它就不再可用了，并且自然没有这些依赖性，运行非常流畅。我在这里错过了什么？

解决方案

我认为你的问题在于，hadoop包含了即将到来的servlet API版本在类路径中的正确的servlet API之前。 Hadoop对Jetty有依赖性，jetty会尝试包含一个servlet API。

我有一个项目，它的设置非常类似Spring MVC和Hadoop。对于hadoop依赖，我有以下排除。请注意，这可能会有所不同，具体取决于您的hadoop分布，我正在使用cloudera的。由于您使用的servlet容器通常会附带自己的javax.servlet依赖项，因此您的排除项目需要解决这个问题。我只用Jetty测试了以下配置：

 < dependency> 
< groupId> org.apache.hadoop< / groupId> 
< artifactId> hadoop-core< / artifactId> 
< version> $ {hadoop.version}< / version> 
<排除项> 
 
<排除> 
< groupId> org.mortbay.jetty< / groupId> 
< artifactId> jetty< / artifactId> 
< /排除> 
<排除> 
< groupId> org.mortbay.jetty< / groupId> 
< artifactId> jetty-util< / artifactId> 
< /排除> 
<排除> 
< groupId> org.mortbay.jetty< / groupId> 
< artifactId> jsp-2.1< / artifactId> 
< /排除> 
<排除> 
< groupId> org.mortbay.jetty< / groupId> 
< artifactId> jsp-api-2.1< / artifactId> 
< /排除> 
<排除> 
< groupId> org.mortbay.jetty< / groupId> 
< artifactId> servlet-api-2.1< / artifactId> 
< /排除> 
<排除> 
< groupId> javax.servlet< / groupId> 
< artifactId> servlet-api< / artifactId> 
< /排除> 
<排除> 
< groupId> javax.servlet.jsp< / groupId> 
< artifactId> jsp-api< / artifactId> 
< /排除> 
<排除> 
< groupId> tomcat< / groupId> 
< artifactId> jasper-compiler< / artifactId> 
< /排除> 
<排除> 
< groupId> tomcat< / groupId> 
< artifactId> jasper-runtime< / artifactId> 
< /排除> 
 <！ - 为简洁起见剪切了其他排除项目 - > 
  

I've seen some similar answer to this question perhaps but I feel my situation is different. I'm developing a spring MVC app working great so far, that is I included hadoop api in my project, when I included hadoop this exception started happening when I am trying to open the initial dashboard page which worked previously :

java.lang.AbstractMethodError: javax.servlet.jsp.JspFactory.getJspApplicationContext(Ljavax/servlet/ 
ServletContext;)Ljavax/servlet/jsp/JspApplicationContext;
 org.apache.jsp.ServerInfo_jsp._jspInit(ServerInfo_jsp.java:63)
 org.apache.jasper.runtime.HttpJspBase.init(HttpJspBase.java:52)
 org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:158)
 org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:328)
 org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:336)
 org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
 javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
 org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:9

Here is how my hadoop dependency looks like :

<dependency>
            <groupId>org.apache.hadoop</groupId>
            <artifactId>hadoop-client</artifactId>
            <version>0.23.1-mr1-cdh4.0.0b2</version>
        </dependency>
        <dependency>
            <groupId>org.apache.hadoop</groupId>
            <artifactId>hadoop-core</artifactId>
            <version>0.23.1-mr1-cdh4.0.0b2</version>
            <exclusions>
                <exclusion>
                    <groupId>org.mortbay.jetty</groupId>
                    <artifactId>jetty</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>javax.servlet</groupId>
                    <artifactId>servlet-api</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

Once I add this to my app it's no longer usable and naturally without these dependecies things run very smooth. What am I missing here?

解决方案

I think that your problem is that hadoop is including a version of the servlet API which is coming before the "correct" servlet API in the classpath. Hadoop has dependencies on Jetty, and jetty will in turn try to include a servlet API.

I have a project with a very similar setup, Spring MVC and Hadoop. I have the below exclusions for the hadoop dependency. Note that this might vary slightly depending on your hadoop distribution, I am using cloudera's. Since the servlet container you are using will usually ship with its own javax.servlet dependency, your exclusion needs to catch this case. I have only tested the below configuration with Jetty:

           <dependency>     
              <groupId>org.apache.hadoop</groupId>
              <artifactId>hadoop-core</artifactId>
              <version>${hadoop.version}</version>
           <exclusions>

          <exclusion>
                <groupId>org.mortbay.jetty</groupId>
                <artifactId>jetty</artifactId>
            </exclusion>
            <exclusion>
                <groupId>org.mortbay.jetty</groupId>
                <artifactId>jetty-util</artifactId>
            </exclusion>
            <exclusion>
                <groupId>org.mortbay.jetty</groupId>
                <artifactId>jsp-2.1</artifactId>
            </exclusion>
            <exclusion>
                <groupId>org.mortbay.jetty</groupId>
                <artifactId>jsp-api-2.1</artifactId>
            </exclusion>
            <exclusion>
                <groupId>org.mortbay.jetty</groupId>
                <artifactId>servlet-api-2.1</artifactId>
            </exclusion>
            <exclusion>
                <groupId>javax.servlet</groupId>
                <artifactId>servlet-api</artifactId>
            </exclusion>
            <exclusion>
                <groupId>javax.servlet.jsp</groupId>
                <artifactId>jsp-api</artifactId>
            </exclusion>
            <exclusion>
                <groupId>tomcat</groupId>
                <artifactId>jasper-compiler</artifactId>
            </exclusion>
            <exclusion>
                <groupId>tomcat</groupId>
                <artifactId>jasper-runtime</artifactId>
            </exclusion>
            <!-- other exclusions snipped for brevity -->

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