Tracking execution of bean used in jsp

hi,
i'm using a bean to get records from a database.
but i'm not sure if the bean is actually getting
called and executed from the jsp file.
i'ld like to get the step by step details about the
execution of bean when it is called.
is this possible?
how?I presume that you have an idea how to code in JSP, so here goes
You create an instance of your bean by doing
<jsp:useBean id="UseMe" class="YourBean"/>
<%
   System.out.println("Calling the bean");
   String result = useMe.methodToBeCalledInYourBean();
   //Assuming that the method is returning the data in a string format
   System.out.println("Result recieved from bean");
%>For knowing what is happening I suggest you put SOP's in your bean methods.
For further queries post some code and the actual problem that you are facing.
Regards,

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How to track the same session using both jsp and servlets

Hello, guys:
"how to use jsp and servlet to track the same session",
it seems to me my logoff.jsp never realize the session I established in my servlets.
Here is how I set my session in my servlets:
" HttpSession session = req.getSession(true);
session.setAttribute("userid",suserid);"
Here is how I invalidate my session in my logoff.jsp
" <%@ page language= "java" %>
<%@ page import="javax.servlet.http.HttpSession" %>
<%@ page session="false"%>
Our Session id is : <%= session.getId() %>
<% session.removeAttribute("userid");
session.invalidate();
%>
Our Session id is : <%= session.getId() %>"
but when I try to logoff using the logoff.jsp
I always get following error message.
"/home/jiao/jsp_webserver/tomcat/work/Standalone/localhost/syllabus/htmls/logoff_jsp.java:50: cannot resolve symbol
symbol : variable session
location: class org.apache.jsp.logoff_jsp
out.print( session.getId() );"
T.I.A.
[Edited by: jiveadmin on Jun 18, 2003 10:32 AM]
[Edited by: jiveadmin on Jun 18, 2003 10:33 AM]

So,
<%@ page session="false"%>
That means the jsp never instantiates the build in session object.
<%@ page session="true"%>
means jsp will instantiates a session object if there are no existing ones
how about I just delete the line,
does that mean the jsp will find the existing session object for me?
So I can do something like
Our Session id is : <%= session.getId() %>
<% session.removeAttribute("userid");
session.invalidate();
%>
directly.
T.I.A.

How to upload a file into server using j2ee jsp and servlet with bean?

How to upload a file into server using j2ee jsp and servlet with bean? Please give me the reference or url about how to do that. If related to struts is more suitable.
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u don't need j2ee and struts to do file uploading. An example is as such
in JSP. u use the <input> file tag like
<input type="file"....>You need a bean to capture the file contents like
class FileUploadObj {
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    * The following loads the uploaded binary data into a byte Array.
    FileUploadObj form = new FileUploadObj();
    byte[] byteArr = null;
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Defining the path for the use of beans in a JSP

          Hello,
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          2) i made the same with the java classpath.
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          We use the \weblogic\myserver\serverclasses for beans..
          of course we pack beans into jar files, and these jar files are included into
          the wls classpath..
          "Sylvain R." <[email protected]> wrote:
          >
          >Hello,
          >I would like to use a bean in a JSP file, via the <jsp:usebean> directive.
          >I didn't find any property (weblogic property) which could define the
          >path
          > to the directory of my beans classes.
          >So :
          >1) i have put the path of this directory in the weblogic classpath in
          >the weblogic
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          >2) i made the same with the java classpath.
          >
          >Both solutions don't work at all.
          >
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          >Thanks in advance.
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Using two beans in a jsp

what's the syntax for declaring two different beans in a JSP ?
can we have two <jsp:useBean...> tags ??
<jsp:useBean id="view" type="org.ab.GenericView" scope="request"></jsp:useBean>

You can have include many <jsp:useBean> tags. Use different id/scope combinations.
e.g.
<jsp:useBean id="view" type="org.ab.GenericView" scope="request"></jsp:useBean>
<jsp:useBean id="anotherview" type="some class" scope="request"></jsp:useBean>
<jsp:useBean id="thirdid" type="some class" scope="session"></jsp:useBean>

Calling bean using jsp

i've installed tomcat v3.3.2, and set the environment variable as normal procedure has mentioned..i have j2sdk 1.4.2_08, and recently has try to expirment calling java beans using jsp file located at D:\jakarta-tomcat-3.3.2\webapps\helloworld.jsp, and my bean file is located at D:\jakarta-tomcat-3.3.2\webapps\ROOT\WEB-INF\classes\com\bean\test\hellobean.class, and my hellobean.java source is :
package com.bean.test;
public class hellobean implements java.io.Serializable
private String Name;
public hellobean() {}
public String getName()
{return Name;}
public void setName(String Name)
{this.Name=Name;}
and my jsp file source:
<html>
<body>
<jsp:useBean id="hello" class="hellobean">
<jsp:setProperty name="hello" property="Name" value="Alan"/>
</jsp:useBean>
<h1>hello, <jsp:getProperty name="hello" property="Name"/></h1>
</body>
</html>
and when i run start.bat and type http://localhost:8080/helloworld.jsp, it gave me this error:
Error: 500
Location: /helloworld.jsp
Internal Servlet Error:
org.apache.jasper.JasperException: hellobean
     at org.apache.jasper.compiler.BeanRepository.getBeanType(BeanRepository.java:140)
     at org.apache.jasper.compiler.GetPropertyGenerator.generate(GetPropertyGenerator.java:59)
     at org.apache.jasper.compiler.JspParseEventListener$GeneratorWrapper.generate(JspParseEventListener.java:747)
     at org.apache.jasper.compiler.JspParseEventListener.generateAll(JspParseEventListener.java:176)
     at org.apache.jasper.compiler.JspParseEventListener.endPageProcessing(JspParseEventListener.java:131)
     at org.apache.jasper.compiler.Compiler.compile(Compiler.java:169)
     at org.apache.tomcat.facade.JasperLiaison.jsp2java(JspInterceptor.java:765)
     at org.apache.tomcat.facade.JasperLiaison.processJspFile(JspInterceptor.java:706)
     at org.apache.tomcat.facade.JspInterceptor.preInitCheck(JspInterceptor.java:493)
     at org.apache.tomcat.facade.ServletHandler.service(ServletHandler.java:413)
     at org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:874)
     at org.apache.tomcat.core.ContextManager.service(ContextManager.java:790)
     at org.apache.coyote.tomcat3.Tomcat3Adapter.service(Tomcat3Adapter.java:64)
     at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:793)
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     at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:571)
     at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:644)
     at java.lang.Thread.run(Thread.java:534)
Root cause:
java.lang.ClassNotFoundException: hellobean
     at org.apache.tomcat.util.depend.DependClassLoader12Impl.loadClassInternal1(DependClassLoader12.java:205)
     at org.apache.tomcat.util.depend.DependClassLoader12Impl$1.run(DependClassLoader12.java:78)
     at java.security.AccessController.doPrivileged(Native Method)
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     at org.apache.jasper.compiler.JspParseEventListener.generateAll(JspParseEventListener.java:176)
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     at org.apache.jasper.compiler.Compiler.compile(Compiler.java:169)
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     at org.apache.tomcat.facade.JasperLiaison.processJspFile(JspInterceptor.java:706)
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     at org.apache.tomcat.facade.ServletHandler.service(ServletHandler.java:413)
     at org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:874)
     at org.apache.tomcat.core.ContextManager.service(ContextManager.java:790)
     at org.apache.coyote.tomcat3.Tomcat3Adapter.service(Tomcat3Adapter.java:64)
     at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:793)
     at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:702)
     at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:571)
     at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:644)
     at java.lang.Thread.run(Thread.java:534)
can anybody help me? thanks

Hi
Same problem as above and did everything as posted here in the page, but still doesn't solve my problem.
Here's the bean :
package com.partha;
public class CounterBean
private int counter=0;
public int getCounter()
return counter;
public void incrementCounter()
counter++;
Here's the JSP Page :
<%@ page language="java" %>
<jsp:useBean id="session_counter" class="com.partha.CounterBean" scope="session"/>
<jsp:useBean id="application_counter" class="com.partha.CounterBean" scope="application" />
<html>
     <head>
          <title>Exercise 3</title>
     </head>
     <body>
          <%= session_counter.incrementCounter() %>
          <%= application_counter.incrementCounter()%>
          The number of times this session was accessed :
          <jsp:getProperty name="session_counter" property="counter" />
          <br>
          The number of times this page was accessed :
          <jsp:getProperty name="application_counter" property="counter" />
     </body>
</html>
I am still getting a classnot found exception . Here's what I am getting :
java.lang.ClassNotFoundException: com.partha.FormBean
     at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1407)
     at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1252)
     at org.apache.jasper.compiler.BeanRepository.getBeanType(BeanRepository.java:133)
     at org.apache.jasper.compiler.Generator$GenerateVisitor.visit(Generator.java:650)
     at org.apache.jasper.compiler.Node$GetProperty.accept(Node.java:507)
     at org.apache.jasper.compiler.Node$Nodes.visit(Node.java:983)
     at org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:1025)
Please help me out ..

Using an attribute set in a servlet as a bean in a JSP

Say, I have saved an attribute in any scope in a servlet or its helper class using setAttribute("xyz", someObject).
* Would I be able to access this attribute in a subsequent JSP using <jsp:getProperty name="xyz" property"someProperty" /> *
The reverse works true ie. setting the attribute first as a bean in a jsp and den accessing it using getAttribut

Lakshminarayanan,
Actually, there are 2 ways to share data between WD components:
1. Context mapping
2. Combo of parameters to methods / parameters in events.
Say, you want to synchronize your 2 toolbars. You may declare some method(s) to alter state in "toolbar" component interface and some event(s) about state update. Now main component has to subscribe to this event from every component usage and invoke method in other component usage to synchronize state.
With context mapping you may achieve state synchronization automatically. Also method/event pair will look plain ugly if you have a lot of parameters or complex structures.
Valery Silaev
EPAM Systems
http://www.NetWeaverTeam.com

How to use bean:write inside jsp:include ?

I got a problem about JSP's syntax. The following is my code:
<%@ include file="<bean:write name="HelloForm" property="target" />"%>
The double quotes inside bean:write is my problem. Could you please teach me how to use bean:write within JSP's include? Thank you!

http://java.sun.com/products/jsp/syntax/1.2/syntaxref12.html
Include Directive vs <jsp:include>
The include directive <%@include %> is done at page translation/compile time.
It effectively pastes in a static file, and then compiles the JSP as if it was all one file.
As such, you cannot provide a runtime expression to it.
To do runtime inclusion, you need to use the <jsp:include> tag which does except runtime parameters.
<%String test = request.getParameter("pageInfo");%>
<%String link = test + ".jsp"; %>
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Cheers,
evnafets

Can anyone give me a bean class for JAVAMAIL, for using in JSP?

Can anyone give me a bean class for JAVAMAIL, for using in JSP?
I hate coding everything inside a jsp page!! Anyone out there who can help me out??

hi
see my post in the javamail forum... here you can see a bean.. I'm trying to connect it with the mysql database - may you can help me

SAME EJB 3.0 Stateful Session bean for different JSP sessions returned

Forum,
I have a strange problem utilizing stateful session beans. Please note, that I am using jdeveloper for the following:
1) Here is a basic stateful session bean:
@Stateful(name = "DemoClass")
public class DemoClassBean implements DemoClass,
           DemoClassLocal, SessionSynchronization {
      public static int id=0;
      public DemoClassBean() {
      id++;
      public int getId() {
         return id;
      //... other methods
}2) This bean is accessed from a JSP for testing purpose, I am copying only the script used in JSP:
<%
   DemoClass bean = null;
   try {
      bean = (DemoClass) ((new javax.naming.InitialContext()).
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      System.out.println("ID=" + bean.getId() );
      } catch (javax.naming.NamingException e) {
         // TODO
%>If this page is addressed by different clients, from different browsers, the same bean is returned.
Here is what I see in the logs:
ID=1
ID=1
ID=1
The same problem is being observed when this session bean is accessed from a JSF Backing bean.
What could be wrong? Is this a bug in oc4j / jdeveloper (version 10.1.3.3.0)?
Edited by: smw000000001 on Nov 17, 2008 10:52 AM

Hi,
The code for stateful is perfectly fine and working in a normal way. The way you are trying to implement the stateful session bean in your application is wrong.
think of binding the stateful session bean with HttpSession object.
So that you will get a unique stateful session bean object.

How to use session variable in JSP function & How to use both JSP Servlet

Hi,
I am new to JSP and servlets
Still I am devloping a website in JSP. I am not mixing JSP with servlets, but I do create Java files for bean, logic and database works.
I try to keep the hard coding part out of JSP.
I dont how to use both JSP and Servlets in combination.
Hence If needed I write some functions in JSP.
but it gives me error
+<%! public void abc()+
+{+
int intUserId = Integer.valueOf((Integer) session.getAttribute("MySession_UserID"));
+}+
+%>+
Saying cannot find symbol session
1) So can u please tell how can I access session variables within JSP function
2) And also give me some links/tutorials about useing both JSP and Servlets in combination.
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Venkat

The application architecture when you use Servlets and JSP in a standard MVC pattern is explained here (under the heading "Integrating Servlets and JSP Pages") and here ...

Database access by Bean, error in JSP(view)

Hello,
I have a web application. All my database connection logic, execution of query is done in my bean. I have verified that the code in my bean is fine and so I have not posted that code.
My jsp code is as follows:
<%@ page import="java.util.*" %>
<%@ page import="java.sql.*" %>
<html>
<head><title>Trial JSP Page</title>
<META HTTP-EQUIV="PRAGMA" CONTENT="NO-CACHE">
<META HTTP-EQUIV="CACHE-CONTROL" CONTENT="NO-CACHE">
<META HTTP-EQUIV="CACHE-CONTROL" CONTENT="NO-STORE">
<META HTTP-EQUIV="CACHE-CONTROL" CONTENT="PRIVATE">
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1">
</head>
<jsp:useBean id="data" class="com.bean.samples.ConnectionBean"/>
<jsp:setProperty name="data" property="drivername" value="oracle.jdbc.driver.OracleDriver"/>
<jsp:setProperty name="data" property="url" value="jdbc:oracle:thin:@someurl"/>
<jsp:setProperty name="data" property="username" value="name"/>
<jsp:setProperty name="data" property="password" value="passwd"/>
<jsp:setProperty name="data" property="query" value="SELECT * FROM tablename"/>
<%
data.processQuery();
ResultSet rs = data.getRs();
ResultSetMetaData rsmd = data.getRsmd();
%>
<body text="black">
The table has <jsp:getProperty name="data" property="count"/> columns and <jsp:getProperty name="data" property="rowcnt"/>
rows in it.
The first column name is <%= rsmd.getColumnLabel(1) %>.
The current row is <%= rs.getRow() %>.
</pre>
</body>
</html>
Output of browser:
The table has 2 columns and 6 rows in it. The first column name is ITEMNO. The current row is
Error: 500
Location: /schedule/jsp/Trial.jsp
Internal Servlet Error:
java.lang.IllegalStateException: Response has already been committed
     java.lang.Throwable(java.lang.String)
     java.lang.Exception(java.lang.String)
     java.lang.RuntimeException(java.lang.String)
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     void org.apache.tomcat.core.HttpServletResponseFacade.sendError(int, java.lang.String)
     void org.apache.jasper.runtime.JspServlet.unknownException(javax.servlet.http.HttpServletResponse, java.lang.Throwable)
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     void javax.servlet.http.HttpServlet.service(javax.servlet.ServletRequest, javax.servlet.ServletResponse)
     void org.apache.tomcat.core.ServletWrapper.handleRequest(org.apache.tomcat.core.Request, org.apache.tomcat.core.Response)
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     void org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(org.apache.tomcat.service.TcpConnection, java.lang.Object [])
     void org.apache.tomcat.service.TcpConnectionThread.run()
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Error is being thorwn on the statemnt:
The current row is <%= rs.getRow() %>.
Can anyone help with this?
Thanks in advance.

Hi beattris,
No I dont close the rs and conn objects.
The relevant method of my bean is :
public void processQuery() throws Exception{
     try{
          Class.forName(getDrivername());
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          rs = st.executeQuery(getQuery());
          rsmd = rs.getMetaData();
          int columncount = rsmd.getColumnCount();
          int rowcount = 0;
          setCount(columncount);
          while(rs.next()){
               rowcount++;
          setRowcnt(rowcount);
     }catch(Exception e){
          throw e;
I did some searching on the internet for this error and found that it is tricky one and so far I havent found a way to correct it.
The link i went to were:
http://developer.java.sun.com/developer/Books/ProJSP/Chap19.pdf
and
http://archives2.real-time.com/rte-tomcat/2000/Jun/msg02490.html
Well, I hope I get some answers soon.
Thanks.

BEAN : Bean included in JSP Page

Hi ,
I had developed a web-application in that I had included a bean in a JSP code by using the following
<jsp:useBean id="testbean" scope="session" class="path.test" />
now the problem is some times when we click on that particular JSP page where this bean is included the screen instead of generating the jsp page it gives a complete path of the bean location as specified in the JSP ( i.e ) "path.test" .
When I click the refresh button then the page get's loaded properly.
This issue taken place rarely but it's very important to solve this and it happens in all the JSP pages wherever I had included a bean but only sometimes .
Why so??? and help me to solve this problem
Server: Apache � Tomcat 5.0
thanks in advance

You are absolutely correct. All your java classes should be in packages.
I actually think its a java limitation introduced in Java 1.4 - they no longer allow access to the unnamed package.
For full details check out: http://developer.java.sun.com/developer/bugParade/bugs/4361575.html
My suggestion: include all your beans in packages. Its not that hard is it?
Cheers,
evnafets

Two managed beans in same jsp page

Hello
First this could be a stupid question, but i just can't find a solutions on this problem.
I wondering that could it be a two managed beans in same jsp page, here is a example:
index.jsp
<t:commandLink disabled="#{listBean.currentPage == 1}" id="previous2" type="button" immediate="true" style="font-size:small" action="#{listBean.previousPage}">
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<h:outputText value="Seuraava" id="next"/>
</t:commandLink>
then i have a dataTable like this:
<t:dataTable value="#{customerListBean.customerBeans}"
binding="#{customerListBean.dataTable}" preserveDataModel="true" style="text-align:left">
My problem is that when i push a commandLink it doesn't refresh a dataTable. Does anyone know a solution here or is this just a impossible way to do it?
Thanks for help.

when i push nextPage (commandLink) it's call action
and count a new range of dataset and after that it's
calls a method which is declared on subClass and that
method get a new data of database on given params.
and put it on DataTable.
So listBean is upper class and customerListBean
extends on ListBeanNo, it doesn't work that way as you expected. You have created two independent instances. They doesn't communicate automatically with each other or so. Just use one CustomerListBean instance and call the inherited methods of ListBean on the #{customerListBean} managed bean instance.

How to call the form bean value on jsp withthe help of jstl tag

hi
all friends
i am working in struts & i use jstl tag in jsp. i have one problem rise is how to call the form bean value in jsp page by using jstl tag.
i now how to retrive the value through jsp:logic
eg. <logic:empty name="userListForm" property="users">
NO USER FOUND
</logic:empty>
see * userListForm mean formbaen name.
* users means collection object.
so how can i write above e.g in jstl

You use the jstl core:if or core:choose combined with the EL:
<c:if test="${empty users.userListForm}">
NO USERS FOUND
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Tracking execution of bean used in jsp

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