Servlet错误

我的web程序开始没有servlet，但是在我添加了一个servlet之后，我其他的jsp页面都打不开了，就这个servlet还可以运行。郁闷了。我的servlet虽然也出现同样的错误，但是还是可以显示的。  
  我用的是jbuilder  
  请问我该怎么解决啊？？  
   
   
  message   Internal   Server   Error  
  description   The   server   encountered   an   internal   error   (Internal   Server   Error)   that   prevented   it   from   fulfilling   this   request.  
  exception   javax.servlet.ServletException:   Servlet.init()   for   servlet   debugjsp   threw   exception  
   
    at   org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:946)  
    at   org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:655)  
    at   org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214)  
    at   org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)  
    at   org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)  
    at   org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)  
    at   org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:190)  
    at   org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)  
    at   org.apache.catalina.valves.CertificatesValve.invoke(CertificatesValve.java:246)  
    at   org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)  
    at   org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)  
    at   org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)  
    at   org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2347)  
    at   org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)  
    at   org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)  
    at   org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:170)  
    at   org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)  
    at   org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:170)  
    at   org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)  
    at   org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)  
    at   org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)  
    at   org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)  
    at   org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)  
    at   org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)  
    at   org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)  
    at   org.apache.catalina.connector.http.HttpProcessor.process(HttpProcessor.java:1027)  
    at   org.apache.catalina.connector.http.HttpProcessor.run(HttpProcessor.java:1125)  
    at   java.lang.Thread.run(Thread.java:534)  
  root   cause   java.lang.NoClassDefFoundError:   org/xml/sax/ext/Attributes2  
    at   java.lang.ClassLoader.defineClass0(Native   Method)  
    at   java.lang.ClassLoader.defineClass(ClassLoader.java:537)  
    at   java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)  
    at   org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1643)  
    at   org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:937)  
    at   org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1372)  
    at   org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1254)  
    at   java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302)  
    at   gnu.xml.aelfred2.XmlReader.(XmlReader.java:67)  
    at   gnu.xml.aelfred2.JAXPFactory$JaxpParser.(JAXPFactory.java:140)  
    at   gnu.xml.aelfred2.JAXPFactory.setFeature(JAXPFactory.java:98)  
    at   gnu.xml.dom.JAXPFactory.newDocumentBuilder(JAXPFactory.java:96)  
    at   org.apache.jasper.parser.ParserUtils.parseXMLDocument(ParserUtils.java:198)  
    at   org.apache.jasper.compiler.TldLocationsCache.processWebDotXml(TldLocationsCache.java:165)  
    at   org.apache.jasper.compiler.TldLocationsCache.(TldLocationsCache.java:138)  
    at   org.apache.jasper.EmbededServletOptions.(EmbededServletOptions.java:350)  
    at   org.apache.jasper.servlet.JspServlet.init(JspServlet.java:265)  
    at   org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:918)  
    at   org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:655)  
    at   org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214)  
    at   org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)  
    at   org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)  
    at   org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)  
    at   org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:190)  
    at   org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)  
    at   org.apache.catalina.valves.CertificatesValve.invoke(CertificatesValve.java:246)  
    at   org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)  
    at   org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)  
    at   org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)  
    at   org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2347)  
    at   org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)  
    at   org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)  
    at   org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:170)  
    at   org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)  
    at   org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:170)  
    at   org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)  
    at   org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)  
    at   org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)  
    at   org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)  
    at   org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)  
    at   org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)  
    at   org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)  
    at   org.apache.catalina.connector.http.HttpProcessor.process(HttpProcessor.java:1027)  
    at   org.apache.catalina.connector.http.HttpProcessor.run(HttpProcessor.java:1125)  
    at   java.lang.Thread.run(Thread.java:534)  
  问题点数：0、回复次数：3Top

1 楼tiannet（http://tiannet.yculblog.com）回复于 2004-12-03 10:10:19 得分 0

你的servlet在web.xml文件中申明了吗？  
   
  类似  
   
  <servlet>  
                <servlet-name>ChackServlet</servlet-name>  
                <servlet-class>ChackServlet</servlet-class>  
      </servlet>  
        <servlet-mapping>  
                <servlet-name>ChackServlet</servlet-name>  
                <url-pattern>/chack_servlet<url-pattern>  
        </servlet-mapping>Top

2 楼xmqds（JAVA主义者）回复于 2004-12-03 10:52:15 得分 0

新增个SERVLET后，JB将上下文路径改变了。你原来的JSP要指向新的上下文路径Top

3 楼fengfengjunjun（fengfeng）回复于 2004-12-03 12:47:56 得分 0

请问什么叫上下文路径啊？  
  Top

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