HTTP Status 500 --- server encountered an internal error

dear all,
i'm using tomcat and mysql for my system. but i'm encountered Internal Server Error. it quite strange that my other servlets running successfully, just this servlet.
*Servlet code
static final String dbURL = "jdbc:mysql://localhost/projectdb?" + "user=wongyuenmei&password=wongyuenmei";
public void doPost(HttpServletRequest request,HttpServletResponse response) throws IOException, ServletException
Connection conn = null;
String nextJSP = null;
try
Class.forName("org.gjt.mm.mysql.Driver");
catch (ClassNotFoundException e)
throw new ServletException("Unable to load JDBC driver");
try
String userid = (String)request.getParameter("userid");
String tempid=userid;
conn = DriverManager.getConnection(dbURL);
Statement stmt = conn.createStatement();
String query = "SELECT rsubcode, grade" + "FROM result" + "WHERE ridno = '" + userid + "'";
ResultSet rs = stmt.executeQuery(query);
if (rs.next())
StringBuffer stuResult = new StringBuffer ();
stuResult.append(rs.getString(3));
stuResult.append(" ");
stuResult.append(rs.getString(4));
request.setAttribute ("stuResult", stuResult.toString());
nextJSP = "/studentResult.jsp";
else
     StringBuffer temptest = new StringBuffer();
     temptest.append(userid);
     request.setAttribute("temptest", temptest.toString());
nextJSP = "/checkFailed.jsp";
conn.close();
ServletConfig config = getServletConfig();
ServletContext context = config.getServletContext();
RequestDispatcher rd = context.getRequestDispatcher(nextJSP);
rd.forward(request, response);
catch (SQLException e)
throw new ServletException("SQL call failed");
catch (Exception e)
throw new ServletException(e.getMessage());
finally
if (conn != null)
try
conn.close();
catch (SQLException e)
throw new ServletException("connection close failed");
}               //close doPost
public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException
doPost(request, response);
*Error
javax.servlet.ServletException: SQL call failed
     at ResultServlet.doPost(ResultServlet.java:62)
     at ResultServlet.doGet(ResultServlet.java:87)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
     at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:260)
     at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
     at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
     at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2415)
     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
     at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
     at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:170)
     at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
     at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:172)
     at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
     at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)
     at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
     at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:223)
     at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:432)
     at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:386)
     at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:534)
     at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:530)
     at java.lang.Thread.run(Thread.java:536)
thanx!
frm alice

sorry for the previous exception.
the actual exception:
javax.servlet.ServletException: Syntax error or access violation: You have an error in your SQL syntax near 'ridno = 'null'' at line 1
     at ResultServlet.doPost(ResultServlet.java:63)
     at ResultServlet.doGet(ResultServlet.java:88)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
     at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:260)
     at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
     at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
     at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2415)
     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
     at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
     at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:170)
     at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
     at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:172)
     at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
     at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)
     at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
     at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:223)
     at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:432)
     at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:386)
     at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:534)
     at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:530)
     at java.lang.Thread.run(Thread.java:536)
thanx for help!!
alice

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  • Unable to start VM - The server encountered an internal error

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    http://msdn.microsoft.com/en-us/library/azure/dn495226.aspx
    http://azure.microsoft.com/en-us/documentation/articles/install-configure-powershell/
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    Susie
    Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Subscriber Support, contact [email protected]

  • The server encountered an internal error that prevented it from fulfilling

    Hi members!
    I am new member of Java EE. When running my the following practice:
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    <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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    xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
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    org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.invoke(SecurityContextEstablishmentValve.java:70)
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    org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:829)
    org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:598)
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  • "The Server Encountered an Internal Error" XT65/75

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    In order to diagnose further we might require further more information including Subscription ID and Log Reports.
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  • New-AzureQuickVM - InternalError : The server encountered an internal error. Please retry the request

    HI, I am trying to use quickVm create in powershell as I have a need to autmate the creation. Since this monring, I am stryudggling to acheive this task. Cloud service gets created and deployed and then I get :
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    The server encountered an internal error. Please retry the request.
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    $location="North
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  • The server encountered an internal error. Please retry the request.

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  • The server encountered an internal error and was unable to complete your request.

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  • The server encountered an internal error () that prevented it from fulfilli

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    DetailsTimestamp: 2006-06-09 16:26:39.513
    Log Level: SEVERE
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    Servlet.service() for servlet Faces Servlet threw exceptioncom.sun.rave.web.ui.appbase.ApplicationException: javax.servlet.ServletException     at com.sun.rave.web.ui.appbase.faces.ViewHandlerImpl.destroy(ViewHandlerImpl.java:601)     at com.sun.rave.web.ui.appbase.faces.ViewHandlerImpl.renderView(ViewHandlerImpl.java:316)     at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:87)     at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:225)     at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:117)     at javax.faces.webapp.FacesServlet.service(FacesServlet.java:194)     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)     at java.lang.reflect.Method.invoke(Method.java:585)     at org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:249)     at java.security.AccessController.doPrivileged(Native Method)     at javax.security.auth.Subject.doAsPrivileged(Subject.java:517)     at org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:282)     at org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:165)     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:257)     at org.apache.catalina.core.ApplicationFilterChain.access$000(ApplicationFilterChain.java:55)     at org.apache.catalina.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:161)     at java.security.AccessController.doPrivileged(Native Method)     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)     at com.sun.rave.web.ui.util.UploadFilter.doFilter(UploadFilter.java:194)     at 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org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:551)     at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:132)     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:551)     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:933)     at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:189)     at com.sun.enterprise.web.connector.grizzly.ProcessorTask.doProcess(ProcessorTask.java:604)     at com.sun.enterprise.web.connector.grizzly.ProcessorTask.process(ProcessorTask.java:475)     at com.sun.enterprise.web.connector.grizzly.ReadTask.executeProcessorTask(ReadTask.java:371)     at com.sun.enterprise.web.connector.grizzly.ReadTask.doTask(ReadTask.java:264)     at com.sun.enterprise.web.connector.grizzly.TaskBase.run(TaskBase.java:281)     at com.sun.enterprise.web.connector.grizzly.WorkerThread.run(WorkerThread.java:83)Caused by: javax.faces.FacesException: javax.servlet.ServletException     at com.sun.faces.context.ExternalContextImpl.dispatch(ExternalContextImpl.java:331)     at com.sun.faces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:132)     at com.sun.rave.web.ui.appbase.faces.ViewHandlerImpl.renderView(ViewHandlerImpl.java:311)     ... 41 moreCaused by: javax.servlet.ServletException     at org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:827)     at org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:763)     at org.apache.jsp.medarbejdere_jsp._jspService(medarbejdere_jsp.java:111)     at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:105)     at javax.servlet.http.HttpServlet.service(HttpServlet.java:860)     at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:336)     at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:297)     at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:247)     at javax.servlet.http.HttpServlet.service(HttpServlet.java:860)     at sun.reflect.GeneratedMethodAccessor100.invoke(Unknown Source)     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)     at java.lang.reflect.Method.invoke(Method.java:585)     at org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:249)     at java.security.AccessController.doPrivileged(Native Method)     at javax.security.auth.Subject.doAsPrivileged(Subject.java:517)     at org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:282)     at org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:165)     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:257)     at org.apache.catalina.core.ApplicationFilterChain.access$000(ApplicationFilterChain.java:55)     at org.apache.catalina.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:161)     at java.security.AccessController.doPrivileged(Native Method)     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)     at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:723)     at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:482)     at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:417)     at org.apache.catalina.core.ApplicationDispatcher.access$000(ApplicationDispatcher.java:80)     at org.apache.catalina.core.ApplicationDispatcher$PrivilegedForward.run(ApplicationDispatcher.java:95)     at java.security.AccessController.doPrivileged(Native Method)     at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:313)     at com.sun.faces.context.ExternalContextImpl.dispatch(ExternalContextImpl.java:326)     ... 43 more
    Diagnostic Causes
    package servlets;
    * Returns the requested JPG from the database; input parameters are:
    * @param imageid The id of the image to return
    * @param size "full" or "thumbnail", default is "full"
    // Import the JNDI classes
    import java.io.*;
    import javax.naming.*;
    // Import the Servlet classes
    import javax.servlet.*;
    import javax.servlet.http.*;
    // Import our database classes
    import java.sql.*;
    import javax.sql.*;
    //import compare.*;
    * Cache a reference to the datasource object that we will use later to obtain
    * a connection to the database
    public class ShowImages extends HttpServlet
    public ShowImages() {
    public void init() throws ServletException
    try
    // InitialContext ic = new InitialContext();
    // this.datasource = ( DataSource )ic.lookup( "java:/WebPhotoGalleryDS" );
    catch( Exception e )
    throw new ServletException( e );
    public void service( HttpServletRequest req, HttpServletResponse res ) throws ServletException
    String ini = req.getParameter("ini");
    ResultSet rs = null;
    try
    boolean aaben = false;
    boolean luk = false;
    //ResultSet rs = null;
    compare.DB data = new compare.DB();
    aaben = data.openDBConnection();
    rs = data.getResultSet("SELECT Billede FROM Medarbejdere WHERE Ini = '"+ini+"')");
    //ResultSet rs= this.getData(model);
    BufferedInputStream b = null;
    while(rs.next())
    b = new BufferedInputStream(rs.getBinaryStream("Billede")) ;
    luk = data.closeDBConnection();
    res.setContentType( "image/jpg" );
    BufferedOutputStream out = new BufferedOutputStream( res.getOutputStream() );
    byte by[] = new byte[ 32768 ];
    int index = b.read( by, 0, 32768 );
    while ( index != -1 )
    out.write( by, 0, index );
    index = b.read( by, 0, 32768 );
    out.flush();
    catch( Exception e )
    e.printStackTrace();
    throw new ServletException( e );
    finally
    }

    The origin of the error could be truncated by limitation of a stack trace. In your case:
    com.sun.faces.context.ExternalContextImpl.dispatch(ExternalContextImpl.java:326)
    ... 43 more
    What you can do is add Java option: "-XX:MaxJavaStackTraceDepth=0" - this will make appserver print all Java stack trace and you will be able to see the origin of your exception.

  • Server encountered an internal error

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    MINE:
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    javax.servlet.ServletException
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         at org.apache.jsp.select_action_jsp._jspService(select_action_jsp.java:149)
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         at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
         at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
    HIS:
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    java.lang.NoClassDefFoundError: jp/ne/so_net/ga2/no_ji/jcom/IDispatch
    org.apache.jsp.select_005faction_jsp._jspService(select_005faction_jsp.java:60)
    org.apace.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
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    <%@ page import="smarts.*" %>
    <%@ page import="java.util.*" %>
    <!--FORM Allows User to Select Action - Add, Modify or Remove a User-->
    <%
    String strLogon = (String)request.getParameter("logon");
    String strPassword = (String)request.getParameter("pwd");
    if ((strLogon == null) && (strPassword == null)){
         strLogon = (String)request.getSession().getAttribute("accessLogon");
         strPassword = (String)request.getSession().getAttribute("userPwd");
    boolean checkLogin;
    Authenticator app = new Authenticator();
    checkLogin= app.OpenApplication(strLogon, strPassword);
    %> .......
    Program Authenticator:
    package smarts;
    import java.util.*;
    import jp.ne.so_net.ga2.no_ji.jcom.*;
    public class Authenticator
    private IDispatch objAuthDoc;
    private ReleaseManager rm;
    private IDispatch objUsrFldr;
    private IDispatch objUsrColl;
    public Authenticator()
    rm = new ReleaseManager();
    public boolean OpenApplication(String userName, String userPwd) throws Exception
         try
    IDispatch objAuthApp = new IDispatch(rm, "Authenticator2.Application");
    IDispatch objDocument = (IDispatch)objAuthApp.get("Documents");
    int cnt;
         Object[] objArgList = new Object[3];
                   objArgList[0] = "smarts";
    objArgList[1] = userName;
                   objArgList[2] = userPwd;
                   objDocument.method("OpenWithBasicSignon", objArgList);
    cnt = ((Integer)objDocument.get("Count")).intValue();
    //Check if the Document contains an Authenticator Document
    if(cnt == 0)
    return false;
    else
    Object[] objItemIndex = new Object[1];
                   objItemIndex[0] = new Integer(1);     
              objAuthDoc = (IDispatch)objDocument.method("Item", objItemIndex);
              objUsrFldr = (IDispatch)objAuthDoc.get("UserFolder");
         objUsrColl = (IDispatch)objUsrFldr.get("Users");
              catch(Exception e)
    e.printStackTrace();
    Close();
    return false;
    return true;
    } .........

    Well, his error says it cannot find the IDispatcher class, which probably means there's a whole bunch more it can't find.
    This package jp.ne.so_net.ga2.no_ji.jcom, where does it exist? Is it a .jar file somewhere, or is it in a directory structure under your root?
    You may also want to navigate (on your machine) to:
    <%TOMCAT_HOME%>/work/Catalina/localhost/<%Context%>/<%path%>/select_action_jsp.java and look at line 149. You'll find the culprit there.
    (Tomcat Home is where you installed Tomcat, Context is the Context name for your application, and Path is the series of subdirectories that get you to wherever select_action.jsp is)

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