About jsp tags..............

Pls help
I am studing about JSP
if we write code in scriptlet tag i.e. < % %>
code goes into service() method of servlet ,which is automatically created by jsp Engine
if we write code in declaration tag i.e. <%! %>
code goes outside service() method of servlet ,which is automatically
created by jsp Engine means at class level.
is their any tag so that jsp code goes into init() method of servlet ,which is automatically created by jsp Engine for that jsp

simple and straight u need to code init() method using <%! %> tags.. but in case JSP it has to be jspInit() method.
The jspInit method is called by the container once and only once for a servlet instance. As you might guess from its name it is used to do initial once only setup such as getting resources and initialising variables that are used in the JSP page. The jspInit method can be overridden within a JSP page with code like the following.
<%!
public void jspInit(){
/*getServletConfig is inherited */
ServletConfig config= getServletConfig();
%>REF : http://www.examulator.com/moodle/mod/resource/view.php?id=380
REGARDS,
RaHuL

Similar Messages

Question about jsp tags

Hello to all the programmers ,
I have the code below , i get from servlet the attribute that called carList and then i use the forEach iterator for
view the list of employees.
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head><title>The list of the Employees</title></head>
<body>
<table>
     <tr>
       <th bgcolor="cccccc">EMP_ID</th>
       <th bgcolor="cccccc">FIRST_NAME</th>
       <th bgcolor="cccccc">LAST_NAME</th>
     </tr>
<c:forEach items='${empList}' var='emp' >
    <tr>
    <td>${emp.id }</td>
    <td>${emp.first_name}</td>
    <td>${emp.last_name}</td>
    </tr>
</c:forEach>
</table>
</body>
</html>The result that i get us :
EMP_ID FIRST_NAME LAST_NAME
${emp.id} ${emp.first_name} ${emp.last_name}
with the suitable headers of course.
Why i get this result and not get as i expected the empBean.
Regards
Ofer

I checked the web.xml and version is 2.4.
I don't thhink that problem related to the web.xml , because i have another example that worked like this one :
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%
    // DON'T FREAK OUT!!! This scriptlet code will go away once
    // we have a model and controller in place...
    String[ ][ ] empList = {
            {"22254", "Joe", "Pashi"},
            {"15487", "Yos", "Alke"},
            {"8777", "Jhon", "Gatez"}
    pageContext.setAttribute("empList", empList);
%>
<html>
<body>
<table border="1">
    <tr>
      <th bgcolor="cccccc" align="left">Id</th>
      <th bgcolor="cccccc" align="left">First_Name</th>
      <th bgcolor="cccccc" align="left">Last_Name</th>
    </tr>
    <c:forEach items='${empList}' var='emp'>
      <tr>
      <td align="left">${emp[0]}</td>
      <td align="left">${emp[1]}</td>
      <td align="left">${emp[2]}</td>
      </tr>
    </c:forEach>
</table>
</body>
</html>when i run this jsp page in tomcat i get the this result as expected :
Id First_Name Last_Name
22254 Joe Pashi
15487 Yos Alke
8777 Jhon Gatez
I think that maybe i missed something in the previous example , something that related to the iterator forEach.
I try to do the same thing but get the array of the employee from the servlet that's all , i see that the arrayList of the employees is created and i assign as an attribute.

JSP tags for managing MBeans??

Hi,
I'm trying to build a GUI for managing a custom MBean. The MBean implementation is a wrapper for a singleton class (specifically, a Configuration class for a web app). I've tried using WebJMX, but the problem there is that it relies heavily on MX4J, and has not kept up with JMX advances in the last two years (MX4J is a bit ahead of weblogic 8.1).
Just as there is a set of console extension jsp tags, I suspect that a set of JSP tags exists for the developers of the Weblogic console to write their JSP pages to manage the weblogic MBeans. I coud just try to figure out the pattern of the INPUT and FORM tags in the html, but that leaves me with a possibly-inaccurate, version-dependent, non-dynamically-generated page to manage one MBean.
Does such a set exist? Could someone point me to any information about how to use such a set of tags?
I would like to be able to have the JSP I use for my console extension display an interface for modifying MBean configurable fields and executing MBean operations. What would the best way be to do this? I do not want to embed the Sun JMX RI in my web-app and launch a separate HtmlAdaptor listening on a different port. I would like the admin to the MBean be accessible through (and only through) the weblogic console.
Thanks in advance for the help,
Matt Geis

Hi,
I'm trying to build a GUI for managing a custom MBean. The MBean implementation is a wrapper for a singleton class (specifically, a Configuration class for a web app). I've tried using WebJMX, but the problem there is that it relies heavily on MX4J, and has not kept up with JMX advances in the last two years (MX4J is a bit ahead of weblogic 8.1).
Just as there is a set of console extension jsp tags, I suspect that a set of JSP tags exists for the developers of the Weblogic console to write their JSP pages to manage the weblogic MBeans. I coud just try to figure out the pattern of the INPUT and FORM tags in the html, but that leaves me with a possibly-inaccurate, version-dependent, non-dynamically-generated page to manage one MBean.
Does such a set exist? Could someone point me to any information about how to use such a set of tags?
I would like to be able to have the JSP I use for my console extension display an interface for modifying MBean configurable fields and executing MBean operations. What would the best way be to do this? I do not want to embed the Sun JMX RI in my web-app and launch a separate HtmlAdaptor listening on a different port. I would like the admin to the MBean be accessible through (and only through) the weblogic console.
Thanks in advance for the help,
Matt Geis

Why does people use JSP Tag for their JSP page? (Urgent)

I don't know what benifit if I am using JSP Tag.
If anyone knows, pls give me an idea and the advantage of using JSP Tag in JSP Page!
Thanks in advance!

You have to read a little about JSP, JSP stands for JavaServer Pages, you can use jsp tags and you can use java code. If you dont want to use jsp tags then you should just write html file, if you just want to use java, then write java class or a servlet.
The need for jsp arised because people were inserting html code inside a servlet class..a big no no..and a headache. JSP separate model from the view...read a little about MVC-2 model view controller pattern.
Also read some tutorial on this website...good luck
K

I can't use JSP tags lib in IWS6

I was trying to use JSP tags lib but the web server doesn't find the *.tld file. Some messages are shown:
25/Jun/2002:19:40:28] info ( 5604): JSP: JSP1x compiler threw exception
org.apache.jasper.compiler.CompileException: /local/iplanet/docs/menu_principal.jsp(1,0) Unable to open taglibrary http://apache.org/taglibs/dbtags : Could not locate TLD http://apache.org/taglibs/dbtags
at org.apache.jasper.compiler.JspParseEventListener.handleDirective(JspParseEventListener.java:707)
at org.apache.jasper.compiler.DelegatingListener.handleDirective(DelegatingListener.java:110)
at org.apache.jasper.compiler.Parser$Directive.accept(Parser.java:215)
at org.apache.jasper.compiler.Parser.parse(Parser.java:1077)
at org.apache.jasper.compiler.Parser.parse(Parser.java:1042)
at org.apache.jasper.compiler.Parser.parse(Parser.java:1038)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:218)
at com.iplanet.server.http.servlet.NSServletEntity.load(NSServletEntity.java:252)
at com.iplanet.server.http.servlet.NSServletEntity.update(NSServletEntity.java:173)
at com.iplanet.server.http.servlet.NSServletRunner.Service(NSServletRunner.java:416)
[25/Jun/2002:19:40:28] warning ( 5604): Internal error: Failed to get GenericServlet. (uri=/menu_principal.jsp,SCRIPT_NAME=/menu_principal.jsp)
I have some doubts about how to work with JSP Tags in iws6. What should I do to get this work?
The tag lib is gotten from jakarta project and I'd like to know which steps i have to follow.
Thank you very much

Hi,
What you have to do is this:
- Include the jar file in the WEB-INF/lib
- Include the tld file in a directory under WEB-INF, for example tlds
- Create a mapping in the deployment descriptor (web.xml), to make the taglib available, something like this:
<taglib>
<taglib-uri>http://jakarta.apache.org/taglibs/io</taglib-uri>
<taglib-location>/WEB-INF/tlds/io.tld</taglib-location>
</taglib>
Then in the jsp, you have to invoke it like this:
<%@ taglib uri="http://jakarta.apache.org/taglibs/io" prefix="io" %>
<io:http url="http://mustang:4004/NASApp/fortune/fortune" action="GET"/>
Hope this helps
Juan

Javazoom UploadBean - using UploadBean properties within jsp tags

I am working on a jsp web application and integrating the UploadBean from javazoom.net into it. I am using a MySQL database to capture all informaion about mp3 files being uploaded - filename, date, filetype, etc.
Can someone guide me as to whether it is possible to reference the properties of the UploadFile class within a jsp tag?
What I am trying to do is this - I want to capture the filename of the file I upload and store it in a MySQL database. Within the SimpleUpload.jsp page, the filename is accessed within scriplet code as follows:
file.getFileName();
(Where file is a variable representing an instance of the UploadFile class, and getFileName() is a method in this class that returns the file name you are uploading).
What I would like to do is use this method so that this same filename can be used in a a sql:update tag to populate a database with the filename and with the other details of the file which is uploaded.
Can anyone advise as to if this is possible and how? I tried to create a sql:update statement to populate the database with the result of file.getFileName();
The problem is that the sql:update jsp tag can't see the file.getFileName() object and method - it doesn't know about this object and method.
Thanks!

I'd still appreciate an answer to this if anyone can help.
Thanks.

JSP Tag- Passing an array of string as an Attribute

Can I pass an array of String as an attribute to a JSP Tag? I read the specification but It does not say any thing about this.
Thanks in Advance.

I thought JSP tags had to deal strictly with string values?

Please help me to get knowledge about struts tags(html,bean,logic).

hai Friends,
I know basics of struts. I have done basic examples.
I have to know , how to get dynamic values in "view".
Instead of writing like this..
<html:select property="color1" size="4" >
<html:option value="red">red</html:option>
<html:option value="blue">blue</html:option>
<html:option value="green">green</html:option>
<html:option value="orange">orange</html:option>
<html:option value="red">red</html:option>
<html:option value="pink">pink</html:option>
</html:select>
How to use <html:options> tag to get dynamic values.
I have to get knowledge about this tags, so please suggest some
sites (or) send some materials (or) send some live examples("[email protected]"). It will very useful..
thanks friends....
take care...
bye.....
will be very useful for me...

you have to have a list of label and value pairs in you ActionForm then define it in your jsp to able able to use it in your <html:options> tag
ActionForm
public final class ColorForm extends ActionForm {
    public String color;
    public void setColor(String color) {
        this.color = color;
    public String getColor() {
        return this.color;
    public List getColorList() {
        List l = new ArrayList();
        ColorLabelValueBean lvRed = new ColorLabelValueBean();
        lv.setLabel("Red");
        lv.setValue("R");
        l.add(lv);
        ColorLabelValueBean lvGreen = new ColorLabelValueBean();
        lv.setLabel("Green");
        lv.setValue("G");
        l.add(lv);
        ColorLabelValueBean lvBlue = new ColorLabelValueBean();
        lv.setLabel("Blue");
        lv.setValue("B");
        l.add(lv);
        return l;
}Label - Value Bean
public final class ColorLabelValueBean implements Serializable {
    private String label;
    private String value;
    public void setLabel(String label) {
        this.label = label;
    public String getLabel() {
        return this.label;
    public void setValue(String value) {
        this.value = value;
    public String getValue() {
        return this.value;
}JSP
<bean:define id="colorListOption" name="ColorForm" property="colorList" type="java.util.List" />
<html:select property="color">
     <html:option value=""></html:option>
     <html:options collection="colorListOption" labelProperty="label" property="value" />
</html:select>
...Good luck!

Nested JSP tags not working in Weblogic 8.1/6.1

Hi,
          I have a custom JSP tag which are used to display buttons (like Submit, Cancel, Revert, Previous etc) on a web page.
          This custom tag has a structure like
          <gui:toolBar>
          <gui:toolTemplate>...</gui:toolTemplate>
          <gui:button>
          <gui:buttonImg>...</gui:buttonImg>
          <gui:buttonAlt>...</gui:buttonAlt>
          </gui:button>
          </gui:toolBar>
          The <gui:button> tag can be repeated depending on the number of buttons needed to be displayed. The body content of the <gui:button> nested tags are used to populate the values in the <gui:toolTemplate/>.
          The issue is that if I have repetitive <gui:button> tags(meaning if I want to have 2 or more buttons), the page does not get compiled in Weblogic (both 6.1 and 8.1).
          But the same works fine in Websphere 4.x and 5.1.
          There are no exceptions being thrown and hence no clue as to what is the issue.
          If I have only one <gui:button> then it works fine even in Weblogic.
          Note: A link on a similar problem(but no soluton mentioned) is
          http://forums.bea.com/bea/thread.jspa?forumID=2025&threadID=200074523&messageID=202373683&start=-1#202373683
          Please advice.
          Sriram.C.S

You're right, your situation is very similar to the situation the other poster describes. However, the main similarity is that neither of you have given us any information about what is going wrong. We can't read minds or read what's on your screen. We need to see specific error messages, stack traces, and specific code that shows what you are trying to do.
          However, it's likely that you're running into problems with the issues with "tag reuse" and "tag pooling". You should first read the JSP specification in the areas that talk about this issue, although this will probably leave you with more questions than you started with.
          I'm guessing that your "<gui:button>" element doesn't have any attributes. It's possible that WebLogic is reusing a single "<gui:button>" tag instance for each occurrence in your page. You may have to figure out how to turn off tag pooling in the JSP compiler, but I'm not sure how to do that.
          It's possible that Websphere doesn't give you an issue with this because perhaps they didn't bother with the tag pooling optimization (it is a good thing to have it available).

Experiences developing iViews with JSP tags

Hi,
has anyone experiences in the development of iViews using JSPs and the JSP tags ? Especially the useBean tag... I think it should be no problem to store beans in the session. If I want to share the bean among iView is it enought to synchronized each method of the bean ?
Thanks

Hi O.,
please, before going on guessing around what synchronization means, read some tutorial, that's what the link was thaught for. It is no problem at all not to know this topic, it's definitely some more advanced topic within the language, but it doesn't help if you don't know it to guess how it <i>could</i> work/behave.
> if I declare all getters and setters of the bean with
> synchronize I avoid the issue of inconsistent data
Once again: For pure getters and setters this sentence is definitely wrong. As long as complex class members are not manipulated / accessed concurrently, there is no need for synchronization (within the class).
> thread 1 sets a value a concurrent thread 2
> could read the data and would get a not actual value...
> if I synchronize the get and set, thread 2 will be
> able to invoke the getter after thread 1 finished the
> setter.
Once again: You don't have it in your hands which thread comes first. And synchronizing a method only means that a thread calling this method will run through it as an atomic operation, no other thread will disturb. But getters and setters normally are atomic, you cannot reach more... If a thread calls two (synchronized) methods of the same object, between these two calls, "the race is open again...".
A good example is http://www-106.ibm.com/developerworks/java/library/j-threads1.html
See the example at the end of this link, that's somehow just what we are talking about. The solution would be to synchronize the <i>setFoo(getFoo() + 1)</i> itself (for example with the bean object as locker). Whereas the synchronization of the methods is superfluous (and time consuming).
Hope it helps
Detlev

Include jsp tags

I am having a problem relacing the include file of let's call it a
header.jsp in a menu page named menu.jsp.
So in my header.jsp file let's say I do something simple like
<table>
<tr><td><jato:href name="first">First Option
</jato:href></td></tr></table>
and so on....
And in my main.jsp I have a simple include at the top of my page
like so
<html
<body>
<%include file=header.jsp%>
etc.
Now when JRun 3.0 makes the include replacement, it seems to have a
problem where it tells me
Servlet error 500
com.iplanet.jato.view href : taglib navigation not found
BUT when I take out the jato tags in the include file...I can get
JRun to make the replacement perfectly....
Does anyone else have this problem and if so how did you get around
it?

Sorry to bother you again, but I couldn't find anything that looked strange
is this file. Can you send us the original file at our personal email
addresses? I'd like to see exactly where the compilation error occurs and
it's not possible with the file inlined here.
todd.fast@e...
michael.frisino@s...
Thanks,
Todd
----- Original Message -----
From: <suket@u...>
Sent: Wednesday, January 17, 2001 2:02
Subject: [iPlanet-JATO] Re: include jsp tags
Hi Mike,
Both of the jsp files (pgHelp.jsp and pgFooter.jsp)
are in the same folder. I removed the IPP/ipp portion in the
include directive but still giving the same err.
iam using Allair Jrun 3.0.
Here is the intermediary generated Jsp file
/ Generated by JRun, do not edit
import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.jsp.*;
import javax.servlet.jsp.tagext.*;
import allaire.jrun.jsp.JRunJSPStaticHelpers;
public class jrun__IPP__ipp__pgHelp2ejsp13 extends
allaire.jrun.jsp.HttpJSPServlet implements
allaire.jrun.jsp.JRunJspPage
private ServletConfig config;
private ServletContext application;
private Object page = this;
private JspFactory __jspFactory = JspFactory.getDefaultFactory();
public void _jspService(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, java.io.IOException
if(config == null) {
config = getServletConfig();
application = config.getServletContext();
response.setContentType("text/html; charset=ISO-8859-1");
PageContext pageContext = __jspFactory.getPageContext(this,
request, response, null, true, 8192, true);
JspWriter out = pageContext.getOut();
HttpSession session = pageContext.getSession();
try {
out.print("\r\n\r\n");
IPP.ipp.pgHelpViewBean viewBean = (IPP.ipp.pgHelpViewBean)
pageContext.getAttribute("viewBean", PageContext.REQUEST_SCOPE);
if(viewBean == null) {
if(JRunJSPStaticHelpers.getAndSetBean(pageContext,
"viewBean", IPP.ipp.pgHelpViewBean.class
, PageContext.REQUEST_SCOPE, 3)) {
viewBean = (IPP.ipp.pgHelpViewBean)pageContext.getAttribute
("viewBean", PageContext.REQUEST_SCOPE);
} else {
viewBean = (IPP.ipp.pgHelpViewBean)pageContext.getAttribute
("viewBean", PageContext.REQUEST_SCOPE);
pageContext.setAttribute("viewBean",viewBean);
out.print("\r\n");
com.iplanet.jato.taglib.UseViewBeanTag useViewBean__4_1 =
(com.iplanet.jato.taglib.UseViewBeanTag)
JRunJSPStaticHelpers.createTagHandler(pageContext,
"com.iplanet.jato.taglib.UseViewBeanTag");
useViewBean__4_1.setPageContext(pageContext);
useViewBean__4_1.setParent(null);
useViewBean__4_1.setClassName("IPP.ipp.pgHelpViewBean");
int useViewBean__4_1_startVal = useViewBean__4_1.doStartTag();
JRunJSPStaticHelpers.checkStartVal
("com.iplanet.jato.taglib.UseViewBeanTag",useViewBean__4_1_startVal,Bo
dyTag.EVAL_BODY_INCLUDE,4);
if(useViewBean__4_1_startVal == BodyTag.EVAL_BODY_INCLUDE) {
com.iplanet.jato.view.ContainerView currentView =
(com.iplanet.jato.view.ContainerView)pageContext.getAttribute
("currentView");
com.iplanet.jato.view.TiledView currentTiledView =
(com.iplanet.jato.view.TiledView)pageContext.getAttribute
("currentTiledView");
out.print("\r\n<HTML>\r\n<HEAD>\r\n");
com.iplanet.jato.taglib.TextFieldTag textField__7_1 =
(com.iplanet.jato.taglib.TextFieldTag)
JRunJSPStaticHelpers.createTagHandler(pageContext,
"com.iplanet.jato.taglib.TextFieldTag");
textField__7_1.setPageContext(pageContext);
textField__7_1.setParent(useViewBean__4_1);
textField__7_1.setSize("20");
textField__7_1.setMaxLength("20");
textField__7_1.setFireDisplayEvents("true");
textField__7_1.setName("tbUserID");
textField__7_1.doStartTag();
if(textField__7_1.doEndTag() == Tag.SKIP_PAGE) {
if(true) return;
out.print("\r\n<TITLE>pgHelp</TITLE>\r\n</HEAD>\r\n<body BGCOLOR=
\"white\" bgcolor=\"#FFFFFF\" text=\"#000000\" link=\"#0000FF\" vlink=
\"#800080\" alink=\"#FF0000\">\r\n");
com.iplanet.jato.taglib.FormTag form__11_1 =
(com.iplanet.jato.taglib.FormTag)JRunJSPStaticHelpers.createTagHandler
(pageContext, "com.iplanet.jato.taglib.FormTag");
form__11_1.setPageContext(pageContext);
form__11_1.setParent(useViewBean__4_1);
form__11_1.setMethod("post");
form__11_1.setName("pgHelp");
int form__11_1_startVal = form__11_1.doStartTag();
JRunJSPStaticHelpers.checkStartVal
("com.iplanet.jato.taglib.FormTag",form__11_1_startVal,BodyTag.EVAL_BO
DY_INCLUDE,11);
if(form__11_1_startVal == BodyTag.EVAL_BODY_INCLUDE) {
out.print("\r\n");
if(form__11_1.doEndTag() == Tag.SKIP_PAGE) {
if(true) return;
out.print("\r\n");
com.iplanet.jato.taglib.UseContainerViewTag view__1_1 =
(com.iplanet.jato.taglib.UseContainerViewTag)
JRunJSPStaticHelpers.createTagHandler(pageContext,
"com.iplanet.jato.taglib.UseContainerViewTag");
view__1_1.setPageContext(pageContext);
view__1_1.setParent(null);
view__1_1.setName("IPP.ipp.pgFooterViewBean");
int view__1_1_startVal = view__1_1.doStartTag();
JRunJSPStaticHelpers.checkStartVal
("com.iplanet.jato.taglib.UseContainerViewTag",view__1_1_startVal,Body
Tag.EVAL_BODY_INCLUDE,1);
if(view__1_1_startVal == BodyTag.EVAL_BODY_INCLUDE) {
currentView = (com.iplanet.jato.view.ContainerView)
pageContext.getAttribute("currentView");
currentTiledView = (com.iplanet.jato.view.TiledView)
pageContext.getAttribute("currentTiledView");
com.iplanet.jato.view.ContainerView
IPP.ipp.pgFooterViewBean = (com.iplanet.jato.view.ContainerView)
pageContext.getAttribute("IPP.ipp.pgFooterViewBean");
out.print("\r\n<hr color=red size=2>\r\nfrom new_footer.jsp in
IPP/ipp directory\r\n<font size=\"-2\" face=\"Arial\"><i>Send
comments to <a href=\"mailto:supportdept@a...\">Any
Company</a></i></font>\r\n<hr color=red size=2>\r\n");
com.iplanet.jato.taglib.HiddenTag hidden__6_1 =
(com.iplanet.jato.taglib.HiddenTag)
JRunJSPStaticHelpers.createTagHandler(pageContext,
"com.iplanet.jato.taglib.HiddenTag");
hidden__6_1.setPageContext(pageContext);
hidden__6_1.setParent(view__1_1);
hidden__6_1.setFireDisplayEvents("true");
hidden__6_1.setName("hdFooter");
hidden__6_1.doStartTag();
if(hidden__6_1.doEndTag() == Tag.SKIP_PAGE) {
if(true) return;
out.print("\r\n");
if(view__1_1.doEndTag() == Tag.SKIP_PAGE) {
if(true) return;
out.print("\r\n");
out.print("\r\n</BODY> \r\n</HTML>\r\n");
if(useViewBean__4_1.doEndTag() == Tag.SKIP_PAGE) {
if(true) return;
} catch(Throwable t) {
if(t instanceof ServletException)
throw (ServletException) t;
if(t instanceof java.io.IOException)
throw (java.io.IOException) t;
if(t instanceof RuntimeException)
throw (RuntimeException) t;
throw JRunJSPStaticHelpers.handleException(t,
pageContext);
} finally {
__jspFactory.releasePageContext(pageContext);
public String getServletInfo()
return "pgHelp";
private static final String[] __dependencies__ =
{"/IPP/ipp/pgHelp.jsp",null};
private static final long[] __times__ = {979720473658L,0L};
public String[] __getDependencies()
return __dependencies__;
public long[] __getLastModifiedTimes()
return __times__;
public int __getTranslationVersion()
return 14;
it is generating 2 semicolons automatically..
near pageContext.getAttribute("IPP.ipp.pgFooterViewBean");
regards
ravi
In [email protected], "Mike Frisino" <Michael.Frisino@S...>
wrote:
Hi Suket,
I just retested something very similar to this in 1.0.
Essentially, i took an existing page which included a tiledView.
I moved the TiledView jsp block into an entirely separate jsp file.
I then replace the TiledView jsp block in the original jsp with aninclude
<%@ include file="TiledGetOrders.jsp"%>
It worked like a charm.
So I am not sure what is wrong in your case.
Could be a jrun bug?
I have tested in resin 1.2.1
To do proper analysis, we would need to see
1. The intermediary .java file that the jsp engine creates, andthen tries
to compile.
C:/Program
Files/Allaire/JRun/servers/default/ipp/WEB-INF/jsp/jrun__IPP__ipp__pgHelp2ej
sp.java
Can you send that to us?
Incidentally, although we do not think a problem there would causethe
compile time error you are seeing,
i am curious about your file value.
<%@ include file="/IPP/ipp/pgFooter.jsp"%>I did not need to use a qualified file name, although my includetarget file
was in the same directory as the
page that was including it. What is the file system relationshipbetween
your top level page "pgHelp" and the include
target "pgFooter".
Are they in same or diff directories?
----- Original Message -----
From: <suket@u...>
Sent: Tuesday, January 16, 2001 9:42 PM
Subject: [iPlanet-JATO] Re: include jsp tags
Hi,
We tried to follow the steps described by you to have
dynamic include in a jsp page.
my jsp file content is
<%@p... info="pgHelp" language="java"%>
<%@t... uri="/WEB-INF/jato.tld" prefix="jato"%>
<jsp:useBean id="viewBean" class="IPP.ipp.pgHelpViewBean"
scope="request"></jsp:useBean>
<jato:useViewBean className="IPP.ipp.pgHelpViewBean">
<HTML>
<HEAD>
<jato:textField name="tbUserID" size="20" maxLength="20"
fireDisplayEvents="true" />
<TITLE>pgHelp</TITLE>
</HEAD>
<body BGCOLOR="white" bgcolor="#FFFFFF" text="#000000"
link="#0000FF" vlink="#800080" alink="#FF0000">
<jato:form name="pgHelp" method="post">
</jato:form>
<%@ include file="/IPP/ipp/pgFooter.jsp"%>
</BODY>
</HTML>
</jato:useViewBean>
This is my pgFooter.jsp
<jato:view name="IPP.ipp.pgFooterViewBean">
<hr color=red size=2>
from new_footer.jsp in IPP/ipp directory
<font size="-2" face="Arial"><i>Send comments to <a
href="mailto:<a href="/group/SunONE-JATO/post?protectID=061075104115193209050223163176249165134048139046">supportdept@a...</a>">Any Company</a></i></font>
<hr color=red size=2>
<jato:hidden name="hdFooter" fireDisplayEvents="true" />
</jato:view>
There is no compilation error in pgFooterViewBean and in
pgHelpViewBean.
How ever iam getting a runtime error,
500 Internal Server Error
/ipp/servlet/IPP.ipp.ippServlet:
javax.servlet.ServletException: Compilation error occured:
allaire.jrun.scripting.DefaultCFE:
Errors reported by compiler:C:/Program
Files/Allaire/JRun/servers/default/ipp/WEB-
INF/jsp/jrun__IPP__ipp__pgHelp2ejsp13.java:105:50:105:50: Syntax:
expected instead of this token
What could be the reason for this error message?
We tried the same thing with another approach, instead of using
include directive, we directly copied the code of pgFooter.jsp in
pghelp.jsp.
even that is giving the same error..
<%@p... info="pgHelp" language="java"%>
<%@t... uri="/WEB-INF/jato.tld" prefix="jato"%>
<jsp:useBean id="viewBean" class="IPP.ipp.pgHelpViewBean"
scope="request"></jsp:useBean>
<jato:useViewBean className="IPP.ipp.pgHelpViewBean">
<HTML>
<HEAD>
<jato:textField name="tbUserID" size="20" maxLength="20"
fireDisplayEvents="true" />
<TITLE>pgHelp</TITLE>
</HEAD>
<body BGCOLOR="white" bgcolor="#FFFFFF" text="#000000"
link="#0000FF" vlink="#800080" alink="#FF0000">
<jato:form name="pgHelp" method="post">
</jato:form>
<jato:view name="IPP.ipp.pgFooterViewBean">
<hr color=red size=2>
from new_footer.jsp in IPP/ipp directory
<font size="-2" face="Arial"><i>Send comments to <a
href="mailto:<a href="/group/SunONE-JATO/post?protectID=061075104115193209050223163176249165134048139046">supportdept@a...</a>">Any Company</a></i></font>
<hr color=red size=2>
<jato:hidden name="hdFooter" fireDisplayEvents="true" />
</jato:view>
</BODY>
</HTML>
</jato:useViewBean>
Please give us a feasible solution to solve this problem.
Thx
Ravi
--- In [email protected], "Todd Fast" <Todd.Fast@S...>wrote:
Craig & Eric--
(If you're not interested in the resolution to the problem Craigposted,
please skip ahead to the section in which I describe the
preferred
technique
for including headers and other common content in a JATO page.
This
discussion is very important because I introduce the concept of"view
compostion", in which JATO pages are composed of modular andreusable view
components. This is one of the most powerful new features of
JATO,
and a
capability that simply wasn't possible in NetDynamics.)
Posted Problem Resolution
Craig & Eric, from what I can tell, you are both trying to
include
a full
view bean in a parent page at translation time. This is notpossible, as
you can see from the compiler errors you get. There are
collisions
when
multiple top-level tags are included in the same JSP.
When I said earlier that you needed to use a translation-timeinclude
instead of a run-time include, I was assuming that you were
trying
to
include a fragment of HTML/JSP in the parent page. By
fragment, I
mean HTML
or JSP content that does not declare a view bean or form, but
rather
references views contained within the parent view bean. If youwant to
include a full page (JSP + ViewBean) in another page, then you'dneed to use
a run-time include. A run-time include temporarily pauses therendering of
the current page, and sends the full request to the included
page
as if it
were a separate client request. The resulting content from theincluded
page is inlined into the parent page's content, and processing
of
the parent
page then continues.
Now I realize after thinking about it a bit that we may not have
sufficiently provided for full page includes because of some
late-
breaking
changes in the request context handling. After some basic
testing,
it
appears that if you try to include one JATO page in another byreferencing
the JSP, the included page will cause a class cast exception tooccur.
There may also be problems because the request context on theincluded page
will not have been set. In any case, full JATO page inclusionlooks like
it's an issue we're going to have to address with some fixes
before
it will
work properly. My apologies. (One workaround if this is
necessary
is to
make the included view bean a child view of the parent view
bean.
I won't
go into that however).
How to Include Common Content
Now, on to the discussion of the preferred way of including
common
content
in a JATO page. Let's say you have a common header you want toinclude in
one or more of your JATO pages. Because of the issue I notedabove, and the
fact that the header is not really independently displayable,
you
don't want
to do a run-time include (which, remember, would necessitateincluding a
full JATO page).
Instead, you should include the header as an HTML/JSP fragmentusing a
translation-time include. Depending on whether your header hasdynamic
information, you can do one of two things. If the header is
just
static
content and/or set of links, you can just reference the HTMLfragment in the
parent HTML directly, and you won't need any kind of view or
view
bean to
back it, or any reference to anything in JATO.
If you need some dynamic info in the header, like the module URLfor a link,
you can reference the parent page's view bean for this
information
by simply
including references to the parent page's implicit JSP variables(viewBean,
currentVIew, and currentTiledView). For example:
Parent JSP:
<jsp:useBean id="viewBean" class="..."scope="request"></jsp:useBean>
<jato:useViewBean className="..." fireChildDisplayEvents="true">
<%@ include file="MyInclude.jsp" %>
</jato:useViewBean>
Included content (MyInclude.jsp):
... viewBean.getRequestContext().getModuleURL() ...
The final HTML with the included content would then look like
this:
<jsp:useBean id="viewBean" class="..."scope="request"></jsp:useBean>
<jato:useViewBean className="..." fireChildDisplayEvents="true">
... viewBean.getRequestContext().getModuleURL() ...
</jato:useViewBean>
MyInclude.jsp will be inlined in the parent JSP before it istranslated to a
servlet. Note that it does not include the full HTML tags
normally
found in
an HTML file--there are no <html>, <head>, or <body> tags
because
it is not
expected to be used outside of an include page. In effect,
this is
the
equivalent of a server-side include (SSI).
Now, if you need truly dynamic info in the header, like say youwant to
display the user's name and SSN, then you'd likely want to
embed a
child
view in the parent view bean which will encapsulate & provide
the
necessary
information. This is in contrast to actually making these
fields
direct
children of the the parent view bean, which would be a tedious
and
error
prone task on every page you wanted to include this information.Let me try
to contrast these two approaches with a diagram of parent-child
relationships:
Here's the bad way:
ParentViewBean (ViewBean)
|
+-- UserFirstName (StaticTextField)
|
+-- UserSSN (StaticTextField)
In this situation, you'd need to provide the logic to populatethese fields
in every view bean on which they appeared. This is tedious andessentially
eliminates the "common"-ness of the content (this is also whatNetDynamics
forced people to do).
Now, the better way:
ParentViewBean (ViewBean)
|
+-- MyHeaderView (MyHeaderView.java)
|
+-- UserFirstName (StaticTextField)
|
+-- UserSSN (StaticTextField)
In the better way, you can see that the header information isencapsulated
in an instance of "MyHeaderView", which is a subclass ofContainerViewBase
or one of the other ContainerView subtypes. The population of
the
data
fields is encapsulated in that view, and the parent view need
not
know
anything about what's actually being displayed by that view.
Thus, you can see that MyHeaderView, in conjunction with a
snippet
of JSP
content in a companion file, is completely modular and can beembedded in
any parent view bean on which you want the header to appear.
The
only
requirement is then to include MyHeaderView as a child view of
the
parent
view bean, and to include the correct JSP content that
references
that child
view.
The included JSP content would now look something like this:
<jato:view name="MyHeaderView">
<table>
<tr><td>... <jato:staticText name="UserFirstName"/>
...</td></tr>
<tr><td>... <jato:staticText name="UserSSN"/> ...</td></tr>
</table>
</jato:view>
If we now included this content in the parent JSP from furtherabove, we get
the following as the JSP content before it is translated into aservlet:
<jsp:useBean id="viewBean" class="..."scope="request"></jsp:useBean>
<jato:useViewBean className="..." fireChildDisplayEvents="true">
<jato:view name="MyHeaderView">
<table>
<tr><td>... <jato:staticText name="UserFirstName"/>
...</td></tr>
<tr><td>... <jato:staticText name="UserSSN"/> ...</td></tr>
</table>
</jato:view>
</jato:useViewBean>
Ultimately, this technique is called "view compostion" or "view
aggregation", and is one of the major new features of JATO. Youcan now
define reusable view components and embed them in multiple viewcontainers,
on the same page or on different pages. Each page acts as a
frame,
in which
you provide the contents from modular components. Using thistechnique, you
can develop reusable view classes and chunks of JSP that can bearbitrarily
combined into complex pages.
I know this is a long and rambling discussion, but I hope I've
made
myself
at least partly clear. I'm more than happy to clarify anything
or
elaborate
more. Please let me know.
Todd
Todd Fast
Senior Engineer
Sun/Netscape Alliance
todd.fast@e...
[email protected]
[email protected]

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