I've just built a prototype with two people at work to test JSP vs. XSL. We're fetching mostly static strings out of a java object with one dynamic field that simply counts accesses. The backend is the same for both JSP and XSL.

The results we're seeing are shocking to me. In our tests, XSL performs typically 50%+ faster than XSL in our testing. I am searching to find anything that could be slowing the JSP side so badly. We are using Weblogic 5.1. Any reasons why we are witnessing such poor JSP performance?

Example:

<form someUnknownAttr="1">

<custom:form someUnknownAttr="1" someSpecialAttr="2">

String url = response.encodeRedirectUrl("NewPage.jsp");
response.sendRedirect (url); 

<%@ page contentType="text/html; charset=shift_jis"%>
<%@ include file="header.jsp" %>

Anyway, since you can only specify the contentType property once per page translation (Tomcat throws an error if you try), how can I tell Tomcat that my included page is in shift_jis too?

I found a Sun document in which the following was written:

The page directive applies to an entire JSP file and any static files it includes with the Include Directive or <jsp:include>, which together are called a translation unit.

<%= a_picture_for_a_button_tag %>

This is what my JSP looks like:

<%
// fname is the file name
File f = new File(fname);
InputStream in = new FileInputStream(f);
ServletOutputStream outs = response.getOutputStream();
		
int bufferSize = 4096;
byte[] ioBuffer = new byte[bufferSize];
byte[] lastBuffer; // last buffer
long counter = 0; // how many bytes we have gotten through
long fileSize = f.length();

response.setHeader("Content-Disposition", "attachment;filename=" + shortname);
response.setContentType("application/download");	

// in a big file, use big buffer chunks
while (fileSize > (counter + bufferSize))
{
	in.read(ioBuffer);
	outs.write(ioBuffer);
           counter += bufferSize;
}
		
// add final chunk if the fileSize does not happen to be divisible by the bufferSize
if (fileSize > counter)
{
	lastBuffer = new byte[ (int) (fileSize - counter) ];
	in.read(lastBuffer);
	outs.write(lastBuffer);
}
		
outs.flush();
outs.close();
in.close();
%>

String headers = "Content-Disposition:attachment;filename=" + shortname + "\r\n" +
		 "Content-Type: application/download\r\n\r\n";
		
outs.write(headers.getBytes());

1. My application is under /opt/tomcat/webapps/myApp
2. My jsp file is : /opt/tomcat/webapps/myApp/web/test.jsp
It contains;
. . .
<%
String configFile=getInitParameter("configFile");
System.out.println("configFIle="+configFile);
%>

3. My web.xml is: /opt/tomcat/webapps/myApp/WEB-INF/web.xml
It contains: <web-app>
<servlet>
<servlet-name>test</servlet-name>
<jsp-file>/web/test.jsp</jsp-file>
<init-parameter>
<param-name>configFile</param-name>
<param-value>TOTO</param-value>
</init-parameter>
</servlet>
<servlet-mapping>
<servlet-name>test</servlet-name>
<url-pattern>/web/test.jsp</url-pattern>
</servlet-mapping>
</web-app>

<form name="someForm" method="post" action="somePage.jsp?id=100">
  <input type="hidden" name="id" value="200">
</form>

I'm kind of new to JSP, and am working on putting together a framework wherein I include common elements of a page (title bar, menu, etc.) in a single WAR file and then attach those elements to my content pages that belong to another WAR file.

The problem I'm running into is that my include statements in my content pages don't work when I try to include items from the different WAR. I can bring the included pages up, but can't get a JSP to include them.

In shared.war, I have the file /htmlcommon/header.jsp. In search.war, I have the document /search.jsp

In search.jsp, I have the following include statement:

However, when I load the page, the header doesn't come in and I get an error 404 - not found.

I'd appreciate any thoughts on this. Thanks much

Michael Lundin
michael.lundin@summitsite.com

http://www.myapp.com/remote/mainpage.jsp?ddl=8766&com=comment&opr=OP000

But if I try to pass those parameters to the JSP from an application on another server, it doesn't work. This is the code I am using to send the parameters:

HttpURLConnection con = (HttpURLConnection)new URL(url).openConnection();

con.setRequestMethod("POST");
con.setDoOutput(true);
OutputStream out = con.getOutputStream();

// data is the line ddl=8766&com=comment&opr=OP000 as in the URL above
out.write(data.getBytes());

%>
<%@ page import="java.util.*,
				java.io.*"
%>
<%@ page language="java"
		 session="false"
		 contentType="text/html; charset=8859_1"
%>
<%
	//read the file name.
	File fFile = new File ("D:/Ibs/outdir/batchres.conf");
	String stFileName = "batchres.conf";
	//the content type set as excel
	response.setContentType ("application/excel");
	//the header and also the Nameis set by which user will be prompted to save
	response.setHeader ("Content-Disposition", "attachment;filename=\""+stFileName+"\"");

	//Open an input stream to the file and post the file contents thru the
	//servlet output stream to the client m/c
	InputStream isStream = null;
	ServletOutputStream sosStream = null;
  	try
  	{
  		//response.flushBuffer();
		isStream = new FileInputStream(fFile);
		sosStream = response.getOutputStream();
		int ibit = 256;
   		while ((ibit) >= 0)
   		{
        		ibit = isStream.read();
        		sosStream.write(ibit);
                      }

	}
	catch (IOException ioeException)
	{
             }
    sosStream.flush();
    sosStream.close();
    isStream.close();
%>

java.lang.IllegalStateException: getOutputStream() has already been called
	at org.apache.tomcat.facade.HttpServletResponseFacade.getWriter(Unknown Source)
	at org.apache.jasper.runtime.JspWriterImpl.initOut(Unknown Source)
	at org.apache.jasper.runtime.JspWriterImpl.flushBuffer(Unknown Source)
	at jsp.ibUTLCmnDownloadView_12._jspService(ibUTLCmnDownloadView_12.java, Compiled Code)
	at org.apache.jasper.runtime.HttpJspBase.service(Unknown Source)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java)
	at org.apache.tomcat.facade.ServletHandler.doService(Unknown Source)
	at org.apache.tomcat.core.Handler.invoke(Unknown Source)
	at org.apache.tomcat.core.Handler.service(Unknown Source)
	at org.apache.tomcat.facade.ServletHandler.service(Unknown Source)
	at org.apache.tomcat.facade.RequestDispatcherImpl.doForward(Unknown Source)
	at org.apache.tomcat.facade.RequestDispatcherImpl.forward(Unknown Source)
	at JP.co.Hitachi.soft.IBS.Common.Servlet.ibUTLCmnDownloadScrGenServlet.doPost(ibUTLCmnDownloadScrGenServlet.java:75)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java)
	at org.apache.tomcat.facade.ServletHandler.doService(Unknown Source)
	at org.apache.tomcat.core.Handler.invoke(Unknown Source)
	at org.apache.tomcat.core.Handler.service(Unknown Source)
	at org.apache.tomcat.facade.ServletHandler.service(Unknown Source)
	at org.apache.tomcat.core.ContextManager.internalService(Unknown Source)
	at org.apache.tomcat.core.ContextManager.service(Unknown Source)
	at org.apache.tomcat.modules.server.Http10Interceptor.processConnection(Unknown Source)
	at org.apache.tomcat.util.net.TcpWorkerThread.runIt(Unknown Source)
	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(Unknown Source)
	at java.lang.Thread.run(Thread.java:479)

I thought if we set the size of the included jsp with <jsp:inlcude> tag it may create an automatic scrollbar. Do anybody have idea about this?

I'm looking for a complete list of the "User-Agent" params in thge request header from all browsers. I don't have all browsers running on my machine, and IE doesn't even let you run multipe versions anyway.

I have a question about how I might call/invoke a JSP from another Java class (which is not itself a Servlet) using the Servlet/JSP container.

For instance, I'd like to use a JSP to automatically generate the body of an e-mail message on a scheduled basis. In this situation, there wouldn't be corresponding Request or Session objects.

Are there any methods that can be called on the Servlet/JSP container which would (a) trigger the compilation of the JSP page into a servlet (if needed) (b) return the response stream of the JSP (i.e.: service method).

Alternatively, is there anyway to use the getRequestDispatcher or getNamedDispatcher methods to get a handle to a JSP.

While, I'd like to use a standard container-neutral facility for doing this, I'd also like to hear about container-specific alternatives which might only work on Tomcat, BEA WebLogic, etc.

Any help is much appreciated.

<HTML>
<BODY>

<% out.println("Testing."); %>

</BODY>
</HTML>

<project name="Test" default="compile" basedir=".">
    <description>
        simple JSP compile
    </description>

  <target name="compile" description="compile the source " >
    <jspc srcdir="."
          destdir="."
          verbose="9"
          classpath="C:\temp\Tomcat-4.1.12\common\lib">
      <include name="**/*.jsp" />
    </jspc>
  </target>
</project>

C:\temp\test>ant
Buildfile: build.xml

compile:
     [jspc] Compiling 1 source fileC:\temp\test
  [jasperc] java.lang.NoClassDefFoundError: org/apache/jasper/JspC
  [jasperc] Exception in thread "main"

BUILD FAILED
file:C:/temp/test/build.xml:10: Java returned: 1

Total time: 3 seconds
C:\temp\test>

My setup in DB is such that, users who can belong to 1 or more groups. And I have in place a permissions table which was made to accommodate permissions for groups(a group can have zero or more permissions.)But dunno whether to use this table or not because permission-ids may have to be hard-coded in logic

Have thought :
a)of giving separate pages for separate groups.
Which would be a maintenance nightmare, to say the least.

b)of using logic that queries the DB and gets the perm-ids and then finds out if a something should be visible or not

e.g:-To see an "Update" button on a page I will do the following...First get the perm-ids of the group the user is in and store in an ArrayList/Vector. Then see what the "update" perm_id is in the DB. if(update_perm_id is in ArrayList){then..show the Update button}
Two downsides I see:-
--Worried that if somebody screws with the perm ids in the DB(change an id, for example by mistake) this could break logic.
--Also there would be lots of "ifs" in the view page(the jsp page) which would go against MVC

c)of making in db, tables connecting user interface and field elements and user-groups..and thus enabling a bit field to say if a certain field is visible or not visible.

I cannot succeed so far because, as I understand, the tags use a path relative to the webapp directory and do not see anything elswhere - Anyone, any idea????

   For instance, if I have request.getParameter("txtLogin"); After this value is received by the servlet, I need to set that parameter to an empty string. I tried using request.setAttribute("txtLogin");, However, must not understand the setAttribute method properly becuase that didn't do it. In fact, I tried to print out all available attribute names, and the getAttributeNames() method returned an empty Enumeration.

public vector getIncomeReport(){
     conn
     sql statement
     while(rs.next()){
     incomeReports.frBeginningBalance = rs.getDouble(1);  
}

I have some small jsp fragments stored in a database. The fragments are templates that are used to display objects in my system.

I need to have a jsp page that will list all these templates and provide a preview of each. As a result, I need to find a method of embedding them in the jsp page and having the fragments evaluated.

I originally attempted this by using a custom tag that returned the jsp as its body. However, I read somewhere that the bodyContent was evaluated before it was provided to the tag.

I also attempted to do this by dynamically including the fragments from a servlet, but that didnt' seem to work (threw a java.io.IOException: Stream closed). This method may be possible, but I would really like to handle this without doing it this way. (However, I will if I have to).

I have to implement a download module wherein I have to
give only registered users the requested files.
The catch is, it has to be implemented in a manner, such
that, the user should not actually make out the link.
i.e., the user should not get the href links.
I think, it is somewhat similar to how BEA implements their
WebLogic downloads.
And it has to be secure with session tracking facilities.

Can I have any code snippets or any methods / algorithms
or any links to the websites explaining how such downloads
can be implemented?

Thanks in advance.

i need a solution that is not ie only or netscape only if possible.
Thanks

How can I display different currencies in my JSP pages according to the location of the client.

How can I serve Word/Excel documents to a web client from JSP's and/or servlets?

What is the JSP equivalent to header("Location: login.php"); in PHP? I want to open a new page in the same window.

How can I print the stack trace of an Exception out to my JSP page?

What is the difference between request.getParameter() and request.getAttribute() ?

How do I import my own java packages and classes for use in JSP pages? In what directory should they reside? How do I put them on the CLASSPATH?

What is the difference between RequestDispatcher's forward(ServletRequest request, ServletResponse response) method and HttpServletResponse's sendRedirect(String location) method?

<form action="<%=pageContext.getServletContext()%>/doThis" method="post">

But this seems like a round about way to go for something so simple. Am I missing something here?

In an MVC architecture how can I pass a bean to my JSP page from my controller?

<jsp:getProperty name="aBean" value="aProperty" />

I would like to be able to use something like:

<mylib:mytag key="myKey" arg0="<jsp:getProperty name="aBean" value="aProperty"%>" />

<frame src = "myjspwithcustomtags.jsp" >

<%@ taglib uri="struts-html.tld" prefix="html" %>
<%@ taglib uri="jakarta-utils.tld" prefix="utils"%>

<jsp:useBean id="dbCon" class="com.vignette.cds.client.beans.DBConnection" scope="page"/>

<%!
   void mostrar_canales (int canal) {
      Connection con = null;
      con = dbCon.getConnection ("content");
...
%> 

For example:

<info:x query="Doe">
<%= name %>
<%= address %>
<p>
</info:x>

In the above example, the first time the body is outputed, I would add the string "items returned: [count]" and the name and address of the first item returned. Than for each additional time the body is printed, only the name and address are outputed.

For example, say the query returned 2 results...

items returned: 2

John Doe
123 Anywhere St.

Jane Doe
1234 Some Other St.

I want a jsp custom tag to evaluate some condition based on the parameters I pass and return a boolean to the jsp page in a java variable (type boolean).

My code is:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<%@ page import="java.lang.Exception,java.io.*"%>
<%@ page isErrorPage="true" %>
<html>
<head>
<title>Untitled</title>
</head>
<body>
Fehler!!!!

Fehler: <%=exception.getMessage()%>

<% PrintWriter writer = new PrintWriter(out);%> Stack: <% exception.printStackTrace(writer);%>

getLocalizedMessage = <%=exception.getLocalizedMessage()%>

toString = <%=exception.toString()%>
</body>
</html>

But here, the StackTrace is printed directly within the Page. How do I save it in a String variable? I want to send myself an automatic report if there is any error.

When I look through the JavaBean resources, their definition of bean seemed a bit different.

I have a framed JSP application and would like to make it so pages meant to be viewed as a frame can only be viewed as a frame.

So, if they type the direct URL to that frame, I would like that page to check to see what frame it is in, and if it is in, say, _top, then redirect to the main (framed) page.

I have a JSP that uses frames inside frames. How can say to the browser to open the Error Page in the main frame (the topmost frame)?

I am trying to display a set of records and each
 record contains 2 or 3 fields along with a submit button 
and whenever the user clicks the button i would like 
to track the contents of the respective record and pass it as the paramter to the next jsp.

By using innerHTML in jsp page which need to populate the data from database in to that page without refreshing that. Here is the actual problem i'm having. i have a jsp page which contains 6 dropdown boxes, if user selects first one, onChange event will fire and it will get data from database and the jsp page is refresing and the data in the remaining 5 dropdown boxes are populated based on the data from database. i would like to do this without refreshing the jsp page, i have an immediate answer that is 'innerHTML' and 'IFRAME' concepts. but i don't know how to implement this, can anybody show me some direction in this. this is an urgent one. thanks,

I tried a javascript after the child window </form> tag to reload parent and close child...but did not seem to work

The left frame contains an applet which displays a JTree and the right frame contains buttons like "Add Node", "Remove Node".

When "Add Node" button is clicked, a Tree Node has to be inserted into the JTree component in the applet on the left frame. How do I access this component in the left frame.

Basically, what I am asking is how do I access a component in the left frame from an action in the right frame? Is there a way to add the JTree object or the applet to the session as an attrbute? If yes, then how do I do it? If I can somehow add the applet to the session, then I can access it from the Session and invoke the appropriate "add" method!

Here is the code for the left frame that holds the Tree applet:

<html> <head> <title>Study Tree </title> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> </head> <body bgcolor="#FFFFFF" text="#000000"> Study Tree

The tree displays all the Surveys, Questions and Responses in this Study

Unable to start Java Plug-in.

I am writing a simple jsp to retrieve and save from/to my MySQL db. My retrieve and save functions work great. Now, depending on the action in the browser, I would only like to invoke one of the methods. For example, for the onChange event, I would like to get the info from the db. For the onClick event, I would like to save the info to the db. Considering these actions are on the client side and jsp is on the server side, is there a way to do this? If not, does anyone have a suggestion on how this can be done?

Thanks,

- Mike

-----------sign_in.jsp------------------
<%@ page language="java" contentType="text/html" %>

<html>

<head>
<meta http-equiv="Content-Language" content="en-ie">
<meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
<meta name="GENERATOR" content="Microsoft FrontPage 4.0">
<meta name="ProgId" content="FrontPage.Editor.Document">
<title>Sign In</title>
</head>

<body>





<form method="POST" action="signin_result.jsp" >
 
  

     
Username:
     
 <input type="text" name=username_signin"> 
  

  

     
Password: 
     
 <input type="password" name="password_signin">
  

  

     

     
 <input type="submit" value="Log In"> 
  
   
  
</form>


</body>

</html>

--------------signin_result.jsp-------------

<%@ page language="java" contentType="text/html" import="java.sql.*,java.awt.*" %>

<html>
<body>

<%
	//load the MySQL JDBC driver
	Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");

	//open a connection to the "fantasyfootball" database
	Connection con = DriverManager.getConnection("jdbc:odbc:fantasyfootball","","");

	//create a statement object for sending SQL queries
	Statement stmt = con.createStatement();

	//place query results in a ResultSet object
	ResultSet res = stmt.executeQuery("SELECT username,password FROM personal_details WHERE username='"+request.getParameter("username_signin") + "' AND password=PASSWORD('"+request.getParameter("password_signin")+"')");

	//assign ResultSet's column 1 to a String variable
	
	while(res.next())
	{
	  String username= res.getParameter("username_signin");
	  String password= res.getParameter("password_signin");
	}

	//clean up all objects
	res.close();
	stmt.close();
	con.close();
%>

<% 	if (username=username_signin ){
		if(password=password_signin)
	  		System.out.println("Login Successful");%>
	  
	<%} else {%>
	  System.out.println("Login Failed");
<%	}%>

</body> </html>

Method that i tried so far but still failed:
1) Deleted the file, doing a refresh and copied the new file over.
2) Putting the following into my jsp page, as adviced by other experts:

<% response.setHeader("Cache-Control","no-cache"); //HTTP 1.1
response.setHeader("Pragma","no-cache"); //HTTP 1.0
response.setDateHeader ("Expires", 0); //prevents caching at the proxy server %>

How can I avoid making multiple HTTP calls for content that hasn't changed? Is it possible to cache it? Is there a way to set this in the header?

I understand that a JSP session cookie is not persistent. Once all browser instances are closed, the session cookie is gone.

I would also like to pass all the session information between the webapps.

I have a cookie customer(aren't they all..I need to bash them somewhere;) who wants different session timeouts for different groups of users...CEO,CIOs aka the elite group need only 30 mins and the John-Q group needs 120 mins before their session times-out/expires.

session = request.getSession(true)

What is the difference between
HttpSession mySession=request.getSession(true)
and
HttpSession mySession=request.getSession()

Hello! I am trying to include a JSP page that contains commonly used html/java code, into another JSP page multiple times using the jsp include directive.

This causes the parser in Websphere Appl. Server 3.5.3 to display an error page that says
org.apache.jasper.compiler.ParseException: Seen file include.jsp already, maybe this is a recursive include?!

However, when developing and testing the JSP page in Visual Age's 4.0 Websphere Test Environment, everything works fine....Why?

If Websphere Application Server is right about not allowing me to include the same JSP page several times, is there some other way perform this task?

Starting service Tomcat-Standalone
Apache Tomcat/4.0.1
Starting service Tomcat-Apache
Apache Tomcat/4.0.1
java.lang.NoSuchMethodError
        at org.apache.catalina.connector.ResponseStream.flush(ResponseStream.java:244)
        at java.io.OutputStreamWriter.flush(OutputStreamWriter.java:245)
        at java.io.PrintWriter.flush(PrintWriter.java:120)
        at org.apache.catalina.connector.ResponseWriter.flush(ResponseWriter.java:125)
        at org.apache.catalina.connector.ResponseBase.finishResponse(ResponseBase.java:481)
        at org.apache.catalina.connector.HttpResponseBase.finishResponse(HttpResponseBase.java:229)
        at org.apache.catalina.connector.http.HttpResponseImpl.finishResponse(HttpResponseImpl.java:288)
        at org.apache.catalina.connector.http.HttpProcessor.process(HttpProcessor.java:1038)
        at org.apache.catalina.connector.http.HttpProcessor.run(HttpProcessor.java:1106)
        at java.lang.Thread.run(Thread.java:484)

The server starts up fine. The error comes up when I access the welcome page. All my other JSP codes residing in Tomcat cannot be access as a result of this problem.

I have tried to reinstall the entire Tomcat Server and JDK 1.3 to ensure that everything is the default setting but the problem still persists. This problem came all of a sudden. There was no problem at all in the first place.

org.apache.jasper.JasperException: Unable to compile class for JSPNote: sun.tools.javac.Main has been deprecated.



An error occurred at line: 2 in the jsp file: /techSupport.jsp

Generated servlet error:
C:\Program Files\Apache Tomcat 4.0\work\localhost\JSPTechSupport\techSupport$jsp.java:60: Class org.apache.jsp.TechSupportBean not found.
                TechSupportBean techSupportBean = null;
                ^



An error occurred at line: 2 in the jsp file: /techSupport.jsp

Generated servlet error:
C:\Program Files\Apache Tomcat 4.0\work\localhost\JSPTechSupport\techSupport$jsp.java:63: Class org.apache.jsp.TechSupportBean not found.
                    techSupportBean= (TechSupportBean)
                                      ^

An error occurred at line: 2 in the jsp file: /techSupport.jsp


Generated servlet error:
C:\Program Files\Apache Tomcat 4.0\work\localhost\JSPTechSupport\techSupport$jsp.java:68: Class org.apache.jsp.TechSupportBean not found.
                            techSupportBean = (TechSupportBean) java.beans.Beans.instantiate(this.getClass().getClassLoader(), "TechSupportBean");
                                               ^

HTTP Status 403 - Access to the requested resource has been denied

This is what i have for my tomcat-users.xml
<?xml version='1.0' encoding='utf-8'?>
<tomcat-users>
<role rolename="manager"/>
<role rolename="tomcat"/>
<role rolename="role1"/>
<user username="admin" password="secret" roles="manager"/>
<user username="tomcat" password="tomcat" roles="tomcat"/>
<user username="role1" password="tomcat" roles="role1"/>
<user username="both" password="tomcat" roles="tomcat,role1"/>
</tomcat-users>

Can anyone tell me what's wrong with it ?

I want to run JSP files using the Tomcat server, where should I place my JSP files?