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创建简单的servlet/ejb程序时出错

2013-02-16 26 views
1

我在尝试执行简单的ejb/servlet应用程序时遇到了一些错误。我使用的服务器是使用eclipse作为IDE的tomcat 7.0。创建简单的servlet/ejb程序时出错

继承人的servlet的

public class CurrencyServlet extends HttpServlet { 
    @EJB 
    CurrencyEjb ejb; 
    private static final long serialVersionUID = 1L; 

    /** 
    * @see HttpServlet#HttpServlet() 
    */ 
    public CurrencyServlet() { 
     super(); 
     // TODO Auto-generated constructor stub 
    } 
    public void init(ServletConfig config){ 

    } 
    /** 
    * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) 
    */ 
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
     // TODO Auto-generated method stub 
    } 

    /** 
    * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) 
    */ 
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
    double result=0;  
    String currency=request.getParameter("amount"); 
    double cur=Double.parseDouble(currency); 
    if(cur>0) 
    { 
     if((request.getParameter("currency").equals("yen"))) 
       { 
      result=ejb.toYen(cur); 
       } 
     else 
      result=ejb.toDollars(cur); 
    } 
    PrintWriter out=response.getWriter(); 
    out.println("Your value is worth:"+result); 
    out.close(); 
    } 

} 


The currencyejb file is as follows. 

import javax.ejb.*; 
@Stateless 
public class CurrencyEjb implements CurrencyMethods{ 
public double toYen(double request) 
{ 
    double result=request*115.3100; 
    return result; 
} 
@Override 
public double toDollars(double request) 
{ 
    double result=request*0.0071; 
    return result; 
} 

}

我的web.xml文件中给出

<?xml version="1.0" encoding="UTF-8"?> 
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0"> 
    <display-name>CurrenyConverter</display-name> 
    <welcome-file-list> 
    <welcome-file>index.html</welcome-file> 
    <welcome-file>index.htm</welcome-file> 
    <welcome-file>index.jsp</welcome-file> 
    <welcome-file>default.html</welcome-file> 
    <welcome-file>default.htm</welcome-file> 
    <welcome-file>default.jsp</welcome-file> 
    </welcome-file-list> 
<servlet> 
     <servlet-name>CurrencyServlet</servlet-name> 
     <servlet-class>CurrencyServlet</servlet-class> 
    </servlet> 
    <servlet-mapping> 
     <servlet-name>CurrencyServlet</servlet-name> 
     <url-pattern>/CurrencyServlet</url-pattern> 
    </servlet-mapping> 
</web-app>

，我得到的是如下

javax.servlet.ServletException: Error instantiating servlet class CurrencyServlet 
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100) 
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:380) 
    org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:243) 
    org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:188) 
    org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:166) 
    org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:288) 
    java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) 
    java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) 
    java.lang.Thread.run(Unknown Source) 


root cause 

javax.naming.NameNotFoundException: Name CurrencyServlet is not bound in this Context 
    org.apache.naming.NamingContext.lookup(NamingContext.java:803) 
    org.apache.naming.NamingContext.lookup(NamingContext.java:159) 
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100) 
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:380) 
    org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:243) 
    org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:188) 
    org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:166) 
    org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:288) 
    java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) 
    java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) 
    java.lang.Thread.run(Unknown Source)

来源

2013-02-16 Nilesh

回答

2

乍一看这些错误，这部分似乎有问题：

@EJB 
CurrencyEjb ejb;

您正在尝试执行EJB注入，这在Tomcat中不可行。如果您的EJB CurrencyEjb部署在其他地方（即在应用服务器中），那么您可以访问它，但不能通过EJB注入。也就是说，Tomcat不是EJB容器，它只是servlet容器，即 - 你不能在其上部署EJB。看看Glassfish，JBoss或TomEE（Tomcat的完整Java EE支持扩展），并尝试在那里部署项目。

来源

2013-02-16 12:59:06

0 
<servlet> 
     <servlet-name>CurrencyServlet</servlet-name> 
     <servlet-class>CurrencyServlet</servlet-class> 
</servlet>

这可能会导致您未设置完整的servlet路径，包括包。 例如：

<servlet-class>your.full.package.CurrencyServlet</servlet-class>

来源

2013-02-16 13:12:12

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