我在Eclipse IDE中使用JSF 2.0.当我尝试实现JSP和Servlet时,我收到以下错误:
java.lang.LinkageError: loader constraint violation: when resolving interface
method "javax.servlet.jsp.JspApplicationContext.getExpressionFactory()
Ljavax/el/ExpressionFactory;" the class loader (instance of
org/apache/jasper/servlet/JasperLoader) of the current class,
org/apache/jsp/exCrop_jsp, and the class loader (instance of
org/apache/catalina/loader/StandardClassLoader) for resolved class,
javax/servlet/jsp/JspApplicationContext, have different
Class objects for the type javax/el/ExpressionFactory used in the signature
at org.apache.jsp.exCrop_jsp._jspInit(exCrop_jsp.java:31)
at org.apache.jasper.runtime.HttpJspBase.init(HttpJspBase.java:49)
at org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:181)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:370)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:389)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:333)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
这是怎么造成的,我该如何解决？
我有一个java Web应用程序.我已经设置了这个新项目并在运行jsp时遇到以下异常,
Oct 10, 2012 3:01:49 AM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet jsp threw exception
java.lang.ClassCastException: org.apache.catalina.util.DefaultAnnotationProcessor cannot be cast to org.apache.AnnotationProcessor
at org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:151)
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:298)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:857)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Thread.java:619)
Oct 10, 2012 3:01:57 AM org.apache.catalina.loader.WebappClassLoader modified
INFO: Additional JARs have been added : 'activation-1.1.jar'
Oct 10, 2012 3:01:57 AM org.apache.catalina.core.StandardContext reload
INFO: …我知道每个servlet容器(例如Tomcat,Glassfish等)都带有servlet-api的实现.
我正在寻找的是一个servlet-api的通用(容器不可知)版本来编译我的应用程序代码.
我还希望在开发期间在我的IDE中使用源代码或Javadoc.
这样的servlet-api.jar版本是否存在？
我在JSF应用程序中使用PrettyFaces.该站点需要身份验证才能访问某些页面,因此我正在使用一个侦听器(预呈现视图)来检查用户是否已登录.因此,如果用户尝试访问/ foo(在PrettyFaces之前的/foo.jsf),我会重定向登录.
但是,我想将它们重定向到它们的初始目的地,所以我想附加一个请求参数"next",以便我将用户重定向到/ login？next =/foo.不幸的是,我无法从请求对象获取原始requestURI,以下代码中的uri字符串是/appname/foo.jsf而不是/ appname/foo
ctx = FacesContext.getCurrentInstance().getExternalContext();
HttpServletRequest request = (HttpServletRequest) ctx.getRequest();
String uri = request.getRequestURI();
有没有办法检索原始URI路径？
我试图通过嵌入jetty开发Web服务器.所以对于jetty 7.3一切正常.昨天我将jetty库更新到最新版本8.0.3,现在我通过创建一个ServletContextHandler得到了一个Exception.
线程"main"中的异常java.lang.NoClassDefFoundError:org.eclipse.jetty.servlet.ServletContextHandler中的javax/servlet/FilterRegistration.(ServletContextHandler.java:126)org.eclipse.jetty.servlet.ServletContextHandler.(ServletContextHandler.java :106)在org.gemsjax.server.GemsJaxServer.main(GemsJaxServer.java:38)的org.eclipse.jetty.servlet.ServletContextHandler.(ServletContextHandler.java:94)
所以我做的是:
public static void main(String[] args) {
Server server = new Server(8080);
ServletContextHandler servletContext = new ServletContextHandler(ServletContextHandler.SESSIONS);
servletContext.setContextPath("/servlets");
servletContext.addServlet(new ServletHolder( new CollaborationWebSocketServlet()),"/collaboration");
// The ResourceHandler to handle static web content
ResourceHandler resourceHandler = new ResourceHandler();
resourceHandler.setDirectoriesListed(true);
resourceHandler.setWelcomeFiles(new String[]{ "index.html" });
resourceHandler.setResourceBase("./war/");
ContextHandler resourceContext = new ContextHandler();
resourceContext.setContextPath("/static");
resourceContext.setHandler(resourceHandler);
HandlerCollection handlers = new HandlerCollection();
handlers.addHandler(resourceContext);
handlers.addHandler(servletContext);
server.setHandler(handlers);
try {
server.start();
server.join();
} catch (Exception e) {
e.printStackTrace();
}
}
抛出异常的行是:
ServletContextHandler servletContext = new ServletContextHandler(ServletContextHandler.SESSIONS);
我使用ubuntu 11.04: …
我能够让我的应用程序再次运行,遵循user2821894的建议,但在尝试调用servlet后,tomcat 7再次停止工作!如果我尝试删除我调用我的servlet的代码我的web应用程序doesent'work !! 一旦我有一个servlet问题tomcat停止工作.
我在eclipse上启动我的web项目时遇到了问题.我遇到了Tomcat 7的问题.所以我从eclipse中删除'tomcat 7然后再添加它(再次添加tomcat 7).
现在我启动我的web项目没有问题,但我的servlet有问题.例如,我得到错误
WebServlet cannot be resolved to a type
The attribute value is undefined for the annotation type
我在我的项目中添加了servlet-api 3.0.jar,但我仍然遇到这些问题.
这是我的servlet的代码
package Jeans;
import java.io.IOException;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.annotation.WebServlet;
import com.sun.java.swing.plaf.windows.TMSchema.Part;
import javax.servlet.http.Part;
@WebServlet("/FileUploadDBServlet ")
//// i got an error here////////////////////////////
@MultipartConfig(maxFileSize = 16177215)
public class FileUploadDBServlet extends HttpServlet {
private String dbURL = "db";
private String dbUser = …When i run the jsp page i am getting the following error.
Web sever : Tomcat 6.0 , using Struts
java.lang.ClassNotFoundException: javax.servlet.jsp.SkipPageException
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1680)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1526)
at org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:128)
at org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:66)
at org.apache.jsp.jsp.login.Main_005ffit_jsp._jspService(Main_005ffit_jsp.java:2846)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:386)
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.ApplicationDispatcher.invoke(ApplicationDispatcher.java:646)
at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:436)
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:374)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:302)
at org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1069)
at org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProcessor.java:455)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:279)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:507)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
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) …我正在编写一个使用smook将XML文件解析为java对象的程序.我被要求将其作为servlet运行.应用程序(在转换为servlet之前)运行得很好,但每次尝试运行它时tomcat服务器都会崩溃.现在我运行一个没有问题的示例servlet.
这是启动时的控制台:
Jun 11, 2012 3:46:59 PM org.apache.catalina.core.AprLifecycleListener init
INFO: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: C:\Program Files\Java\jre7\bin;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;"C:\Program Files (x86)\Common Files\EMC";C:\PROGRA~2\COMMON~1\EMC;.
Jun 11, 2012 3:46:59 PM org.apache.tomcat.util.digester.SetPropertiesRule begin
WARNING: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:Serverlet' did not find a matching property.
Jun 11, 2012 3:46:59 PM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["http-bio-8080"]
Jun 11, 2012 3:46:59 PM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["ajp-bio-8009"]
Jun 11, 2012 …我有一个带有虚拟jsp页面的spring mvc应用程序(名为htmlcontent.jsp).jsp只包含一个字符串:
HalloText
这是jsp的全部内容.控制器如下所示:
package springapp.web;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
@Controller
public class HtmlContentController {
@RequestMapping("/htmlcontent.htm")
public String view() {
return "htmlcontent";
}
}
bean在我的springapp-web.xml中添加
<bean id="htmlcontent" class="springapp.web.HtmlContentController">
我的web.xml中的servlet映射定义如下:
<servlet-mapping>
<servlet-name>springapp</servlet-name>
<url-pattern>*.htm</url-pattern>
</servlet-mapping>
当我打电话给以下时:
http://localhost:8080/spring-mvc-hsqldb/htmlcontent.htm
然后我得到一个NullPointerException:
HTTP Status 500 -
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: java.lang.NullPointerException
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:536)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:368)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:238)
org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:250)
org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1047)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:817)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:549)
javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
root cause
java.lang.NullPointerException
org.apache.jsp.htmlcontent_jsp._jspInit(htmlcontent_jsp.java:22) …我一直在徒劳地尝试实现 tomcat 9 的 jakarta servlet，而不是以前的 javax.servlet 实现（因为我的理解是 jakarta 包是前进的方向）。问题是，当我将浏览器指向我的 servlet 的 url 时，我收到以下错误...
java.lang.ClassCastException: class cti.nm.web.Index cannot be cast to class javax.servlet.Servlet (cti.nm.web.Index is in unnamed module of loader org.apache.catalina.loader.ParallelWebappClassLoader @48c76607; javax.servlet.Servlet is in unnamed module of loader java.net.URLClassLoader @621be5d1)
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:542)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:690)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
org.apache.coyote.ajp.AjpProcessor.service(AjpProcessor.java:432)
org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:888)
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1597)
org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130)
java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
java.base/java.lang.Thread.run(Thread.java:832)
问题已经很明显了。Tomcat 正在尝试将我的 jakarta.servlet.http.HttpServlet 转换为 javax.servlet.Servlet，这显然不起作用。我无法想象的是如何告诉它 servlet 实际实现的类。
类本身被声明为...
package cti.nm.web;
import jakarta.servlet.http.HttpServlet;
import java.io.IOException;
import java.io.PrintWriter;
import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
public class Index extends …