maven项目使用SOLR时报 previously initiated loading for a different type with name "javax/servlet/http/HttpServletRequest" 错的解决方法

环境：Apache solr4.8，maven3,IntellijIDEA

想在项目中使用solr 在pom.xml文件中添加了solr的依赖 solr-core，solrj 和solr-dataimporthandler

在使用tomcat6插件启动项目的时候报错：

八月 22, 2014 3:43:46 下午 org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet jsp threw exception
java.lang.LinkageError: loader constraint violation: loader (instance of org/apache/jasper/servlet/JasperLoader) previously initiated loading for a different type with name "javax/servlet/http/HttpServletRequest"
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2451)
at java.lang.Class.getDeclaredMethods(Class.java:1810)
at org.apache.catalina.util.DefaultAnnotationProcessor.processAnnotations(DefaultAnnotationProcessor.java:226)
at org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:153)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:340)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:602)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Thread.java:722)

 

报错的原因是javax.servlet这个jar包冲突(每个web容器都会提供这样一个名为javax.servlet.jar的jar包)

检查项目的依赖树，发现solr-core和solr-dataimporthandler 都有对javax.servelt 的依赖

在pom.xml中排除这些依赖：

<dependency>
          <groupId>org.apache.solr</groupId>
          <artifactId>solr-dataimporthandler</artifactId>
          <version>4.8.0</version>
         <exclusions>
             <exclusion>
                 <groupId>org.eclipse.jetty.orbit</groupId>
                 <artifactId>javax.servlet</artifactId>
             </exclusion>
         </exclusions>
      </dependency>
    <dependency>
          <groupId>org.apache.solr</groupId>
          <artifactId>solr-core</artifactId>
          <version>4.8.0</version>
        <exclusions>
            <exclusion>
                <groupId>org.eclipse.jetty.orbit</groupId>
                <artifactId>javax.servlet</artifactId>
            </exclusion>
        </exclusions>
      </dependency>

 

重新启动项目之后就不报错了