Question

servlet中的代码导致运行时出错。

JSONArray parent = new JSONArray（）;

    int total=0;
    int count=1;
    int seatswon=0;


    while(rs.next()){
        count++;
        if(count>4){
            seatswon = rs.getInt(2);
            total += seatswon;          
        }
        else{
        JSONObject child = new JSONObject();
        seatswon = rs.getInt(2);
        String partyname=rs.getString(1);
        //System.out.println(partyname+"-"+ seatswon);
        total += seatswon;
        child.put("seatswon", seatswon);
        child.put("partyname", partyname);          
        parent.put(child);
        }

    }

    //total += total_others;
    DB.closeDB();
    JSONObject child = new JSONObject();
    child.put("seatswon", total);
    child.put("partyname","Total");

    parent.put(child);
    pw.print(parent);

    //System.out.println(parent.toString());
    pw.close();
    }catch(Exception e){e.printStackTrace();}

SEVERE：带有路径[/ Proect1]的上下文中servlet [getLevel]的Servlet.service（）引发异常[Servlet执行引发异常]的根本原因 java.lang.ClassNotFoundException：org.json.JSONArray 在org.apache.catalina.loader.WebappClassLoader.loadClass（WebappClassLoader.java:1720）在org.apache.catalina.loader.WebappClassLoader.loadClass（WebappClassLoader.java:1571）在api.akasalabs.nation.getNatLevel.doGet（getNatLevel.java:52）在javax.servlet.http.HttpServlet.service（HttpServlet.java:620）在javax.servlet.http.HttpServlet.service（HttpServlet.java:727）在org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:303）在org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:208）在org.apache.tomcat.websocket.server.WsFilter.doFilter（WsFilter.java:52）在org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:241）在org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:208）在org.apache.catalina.core.StandardWrapperValve.invoke（StandardWrapperValve.java:220）在org.apache.catalina.core.StandardContextValve.invoke（StandardContextValve.java:122） at org.apache.catalina.authenticator.AuthenticatorBase.invoke（AuthenticatorBase.java:503）在org.apache.catalina.core.StandardHostValve.invoke（StandardHostValve.java:170）在org.apache.catalina.valves.ErrorReportValve.invoke（ErrorReportValve.java:103）在org.apache.catalina.valves.AccessLogValve.invoke（AccessLogValve.java:950）在org.apache.catalina.core.StandardEngineValve.invoke（StandardEngineValve.java:116）在org.apache.catalina.connector.CoyoteAdapter.service（CoyoteAdapter.java:421）在org.apache.coyote.http11.AbstractHttp11Processor.process（AbstractHttp11Processor.java:1070） at org.apache.coyote.AbstractProtocol $ AbstractConnectionHandler.process（AbstractProtocol.java:611） at org.apache.tomcat.util.net.JIoEndpoint $ SocketProcessor.run（JIoEndpoint.java:314）在java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1145） at java.util.concurrent.ThreadPoolExecutor $ Worker.run（ThreadPoolExecutor.java:615） at org.apache.tomcat.util.threads.TaskThread $ WrappingRunnable.run（TaskThread.java:61）在java.lang.Thread.run（Thread.java:722）

Answer 1

包含类org.json.JSONArray的jar不在webapp的WEB-INF/lib目录中。所以Tomcat找不到这个类。

Servlet运行时错误：想知道可能是什么原因？

1 个答案: