Java 为什么我会出错；找不到类。加载类“时出错”；？_Java_Ejb

Java 为什么我会出错；找不到类。加载类“时出错”；？

java

Java 为什么我会出错；找不到类。加载类“时出错”；？,java,ejb,Java,Ejb,我有一个接口和一个servlet文件，每当我试图运行应用程序时，它都会给我以下错误严重：未找到类[LDir/DirSessionLocal；]。加载[class DirServlet]时出错接口代码 package Dir; import javax.ejb.Local; @Local public interface DirSessionLocal { String getContact(String name1); String getDetails(String name2)

我有一个

接口

和一个

servlet

文件，每当我试图运行应用程序时，它都会给我以下错误

严重：未找到类[LDir/DirSessionLocal；]。加载[class DirServlet]时出错

接口代码

package Dir;

import javax.ejb.Local;


@Local
public interface DirSessionLocal {

String getContact(String name1);

String getDetails(String name2);

void rater(String r);

}

servlet的代码

import Dir.DirSessionLocal;
import java.io.IOException;
import java.io.PrintWriter;
import javax.ejb.EJB;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


@WebServlet(urlPatterns = {"/DirServlet"})
public class DirServlet extends HttpServlet {
@EJB
private DirSessionLocal dirSession;

/**
 * Processes requests for both HTTP
 * <code>GET</code> and
 * <code>POST</code> methods.
 *
 * @param request servlet request
 * @param response servlet response
 * @throws ServletException if a servlet-specific error occurs
 * @throws IOException if an I/O error occurs
 */
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
    response.setContentType("text/html;charset=UTF-8");
    PrintWriter out = response.getWriter();
    try {
        /* TODO output your page here. You may use following sample code. */
        out.println("<!DOCTYPE html>");
        out.println("<html>");
        out.println("<head>");
        out.println("<title>Servlet DirServlet</title>");            
        out.println("</head>");
        out.println("<body>");
        out.println("<h1>Servlet DirServlet at " + request.getParameter("name") + "</h1>");
        out.println("<br>");
        out.println("<h1>" + request.getParameter("nameD") + "</h1>");
        out.println("<br>");
        out.println("<h1>" + request.getParameter("rate") + "</h1>");
        String a=request.getParameter("nameD");
        if(a.equals("abc"))

         out.println("<h1>" + dirSession.getContact(a)  + "</h1>");
        out.println("</body>");
        out.println("</html>");
    } finally {            
        out.close();
    }
}

// <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
/**
 * Handles the HTTP
 * <code>GET</code> method.
 *
 * @param request servlet request
 * @param response servlet response
 * @throws ServletException if a servlet-specific error occurs
 * @throws IOException if an I/O error occurs
 */
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
    processRequest(request, response);
}

/**
 * Handles the HTTP
 * <code>POST</code> method.
 *
 * @param request servlet request
 * @param response servlet response
 * @throws ServletException if a servlet-specific error occurs
 * @throws IOException if an I/O error occurs
 */
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
    processRequest(request, response);
}

/**
 * Returns a short description of the servlet.
 *
 * @return a String containing servlet description
 */
@Override
public String getServletInfo() {
    return "Short description";
}// </editor-fold>

}

这意味着运行servlet/webapp的JVM无法找到名为

Dir.DirSessionLocal

的类的“.class”文件

根据“部署”servlet的方式，您需要将缺少的类添加到JAR文件、WAR文件、web服务器上的webapp树、，等等。

但是DirSession和DirSessionLocal的类文件已经在Dir目录中成功创建，那么为什么它无法加载？向我们展示stacktrace。我可能有类似的问题，如何用有效的方法部署应用程序来改进答案？在我的例子中，我只是部署了企业应用程序。问题是OP和您都没有提供足够的信息来编写更好的答案。提出新问题，提供所有相关细节，包括完整的stacktrace。