Help with JSP Tag Libraries
Could someone please help me with the setup process of tag libraries? I've looked on the Internet and found some instructions, but they are all for Tomcat. I'm using Jserv, and I'm not sure how to setup my environment to work with custom/tag libraries. Could someone help me by giving me some instructions or sending me to an article that could help me?
Thanks in advance!
-PV
Hi pvongboupha
The best source for getting to know how to set up tag libraries is the JSP specification. You can download this from :
http://java.sun.com/products/jsp/download.html
See the chapter on Tag libraries. Any J2EE compliant server will conform to these rules.
You can also see a chapter from Core Servlets & JSP by Marty Hall. This chapter is on Tag Libraries
http://developer.java.sun.com/developer/Books/javaserverpages/cservletsjsp/
Keep me posted on your progress.
Good Luck!
Eshwar R
Developer Technical Support
Sun microsystems
http://www.sun.com/developers/support
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hi All,
I am receiving an error when i come to start a jsp page, it returns null pointer exception. so when I checked it is coming from the JSP tag Libraries. instead of the jsp libraries there is a null pointer exception . so any clue how to fix that ?
thanks
AmgadYes, marika, download the Jakarta JSTL implementation, unzip it, and put it everything in its /lib directory in your WEB-INF/lib. Then you can refer to the taglib in your JSPs like this:
<%@ taglib prefix="c" uri="http://java.sun.com/jstl/core" %>That's all you need to do. No <taglib> in your web.xml or anything else. - MOD -
Hi ,
I'm new to beans .Please help me on this. I have 2 jsp pages -trial.jsp and trial2.jsp and a bean class-UserInfo.java
I'm setting the bean values from trial.jsp and trying to retrieve from trial2.jsp. But the values are coming as null. Can you please help me on this.
Code of Trial.jsp
<html>
<body>
<form name="beanTest" method="get" action="trial2.jsp">
<table width="60%">
<tr>
<td width="44%">Name</td>
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Trial2.jsp
<form>
<jsp:useBean id="person" class="javaUtil.UserInfo" scope="request"/>
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age:<jsp:getProperty property="age" name="person"/><br>
job:<jsp:getProperty property="occupation" name="person"/><br>
</form>
UserInfo.java
package javaUtil;
import java.io.Serializable;
public class UserInfo implements Serializable{
private static final long serialVersionUID = 1L;
private String name;
private int age;
private String occupation;
public String getName()
return this.name;
public void setName(String name)
this.name=name;
public int getAge()
return this.age;
public void setAge(int age)
this.age=age;
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JSP, Tag Libraries, Tomcat 4.1
Due to an internal decision to place all content within certain categories: for example, we would like all our JSP pages to be in one directory, our TLD files to be in one directory, our images to be in one directory, etc. I would like to be able to set up two Tomcat Contexts (sites). One for /jsp and one for /tld. Is it possible to load the tld and tag class handler in one context and the jsp in another context and call the tag handler even though they are in separate sites? The first reaction someone might have is to just place everything in separate directories under the same context. Well, we do not want to do this because we do not want to use relative URLs. Our testing systems are Window 2000 so it is not a big deal. But our production server is OPENVMS. We want to use aliases for everything. /jsp for JSP pages. /tld for tag libraries, etc. Any thoughts?
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I have tried all three methods of using the mappings that you have suggested. And in every case, I cannot get the JSP page to recognize the location of the TLD from the URI unless I use a context in Tomcat or a relative URL for the URI declaration in the JSP page. So I must be doing something wrong. I am going to post what information is not business sensitive and see if you can find an error.
However, with that being said. We have a specific alias/directory structure we must maintain on the OPEN VMS system. In order to do so, so we can maintain a programmer and a "live" environment we must be able to use these aliases for all our file types. Don't get me wrong, we can use these alias' within the same context of Tomcat, but we must make sure that we can still access or JSP, TLD, and servlets using some sort of alias and NOT using relative URLs. All the dynamic stuff in Tomcat while trying to use Apache for the static content. On OPENVMS, there are things called logicals which can basically be set up as an alias. The logical can point to a specific value, a directory, a group of directories, or even a specific file name or command procedure or anything else you can logically use it for. We have to use these logicals in order to set up our site. These logicals are part of the system security of OPENVMS and this helps us determine which enviroment we need to use for which user.
Hope this gives a bit more informed information.
Currently, the tld and .class file are packaged into a webMenuTag.jar file in the "vsjsp" site.
There are no references to the TLD or Tag Library in the web.xml file. So here is the tld file and also the snippet of the jsp file. The class file is called webMenuTagHandler.class.
Thank you.
TLD:
<?xml version="1.0" encoding="ISO-8859-1" ?>
<!DOCTYPE taglib
PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.2//EN"
"http://java.sun.com/dtd/web-jsptaglibrary_1_2.dtd">
<taglib>
<tlib-version>1.0</tlib-version>
<jsp-version>1.2</jsp-version>
<short-name>webMenu</short-name>
<uri>webMenuTag</uri>
<description>
Tag library to print the menu on WWW site pages
</description>
<tag>
<name>webMenuTagHandler</name>
<tag-class>com.xxxxx.webMenuTagHandler</tag-class>
<description>Create menu and framework for web pages.</description>
<attribute>
<name>menuStyle</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>docTitle</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>pageHeading</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>navBarName</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>navBarLocation</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>htmLocation</name>
<required>true</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
</tag>
</taglib>
JSP:
<%@ page contentType="text/html; charset=iso-8859-1" language="java" import="com.xxxxx.*,java.io.*,java.util.*,javax.servlet.*,javax.servlet.http.*,javax.servlet.jsp.*,org.apache.jasper.runtime.*"%>
<%@ taglib uri="webMenuTag" prefix="webMenu" %>
<html>
<webMenu:webMenuTagHandler docTitle="Test Page" htmLocation="top" navBarName="HOME"/>
... content...
</html> -
Sp9 / pre-release / problem with jsp tags
WLS 5.1, sp9 pre-release, solaris 2.7, WLCS 3.2
JSP compile fails with the exception...
weblogic.servlet.jsp.JspException: (line -1): Error in tag library
at: 'wl':
The Tag class 'weblogicx.jsp.tags.CacheTag' has no setter method
corresponding to
TLD declared attribute 'async', (JSP 1.1 spec, 5.4.1)
at weblogic.servlet.jsp.StandardTagLib.jspException(StandardTagLib.java:138)
at weblogic.servlet.jsp.StandardTagLib.processTag(StandardTagLib.java:264)
at weblogic.servlet.jsp.StandardTagLib.processTagElements(StandardTagLib.java:146)
at weblogic.servlet.jsp.StandardTagLib.<init>(StandardTagLib.java:125)
at weblogic.servlet.jsp.JspLexer.loadTagLib(JspLexer.java:95)
at weblogic.servlet.jsp.JspLexer.mTAGLIB_DIRECTIVE_BODY(JspLexer.java:3873)
at weblogic.servlet.jsp.JspLexer.mTAGLIB_DIRECTIVE(JspLexer.java:3623)
at weblogic.servlet.jsp.JspLexer.mDIRECTIVE(JspLexer.java:3484)
at weblogic.servlet.jsp.JspLexer.mSTANDARD_THING(JspLexer.java:1817)
at weblogic.servlet.jsp.JspLexer.mTOKEN(JspLexer.java:1658)
at weblogic.servlet.jsp.JspLexer.nextToken(JspLexer.java:1548)
at weblogic.servlet.jsp.JspLexer.parse(JspLexer.java:888)
at weblogic.servlet.jsp.JspParser.doit(JspParser.java:69)
at weblogic.servlet.jsp.JspParser.parse(JspParser.java:125)
at weblogic.servlet.jsp.Jsp2Java.outputs(Jsp2Java.java:109)
at weblogic.utils.compiler.CodeGenerator.generate(CodeGenerator.java:242
It could just be me - I an un-jarred a version of weblogic-tags-510.jar where WLS
could find it.
mike
Kumar Allamraju <[email protected]> wrote:
>Yes, my JSP is referring the tag libs. I 'm using counter example given
>in
>examples/jsp/tagext/counter directory
>
><NT Performance Pack> NATIVE: created IoCompletionPort successfully.
>I
>oPort=0x000001d4
>Sun Apr 01 12:44:00 PDT 2001:<I> <WebLogicServer> WebLogic Server star
>ted
>Sun Apr 01 12:44:40 PDT 2001:<I> <NT Performance Pack> Allocating: '2'
> NT reader threads
>Sun Apr 01 12:44:41 PDT 2001:<I> <ServletContext-General> *.jsp: init
>Sun Apr 01 12:44:41 PDT 2001:<I> <ServletContext-General> *.jsp: param
> verbose initialized to: true
>Sun Apr 01 12:44:41 PDT 2001:<I> <ServletContext-General> *.jsp: param
> packagePrefix initialized to: jsp_servlet
>Sun Apr 01 12:44:41 PDT 2001:<I> <ServletContext-General> *.jsp: param
> compileCommand initialized to: c:/java/java122/bin/javac.exe
>Sun Apr 01 12:44:41 PDT 2001:<I> <ServletContext-General> *.jsp: param
> srcCompiler initialized to weblogic.jspc
>Sun Apr 01 12:44:41 PDT 2001:<I> <ServletContext-General> *.jsp: param
> superclass initialized to null
>Sun Apr 01 12:44:41 PDT 2001:<I> <ServletContext-General> *.jsp: param
> workingDir initialized to: D:\releases\510\myserver\classfiles
>Sun Apr 01 12:44:41 PDT 2001:<I> <ServletContext-General> *.jsp: param
> pageCheckSeconds initialized to: 1
>Sun Apr 01 12:44:41 PDT 2001:<I> <ServletContext-General> *.jsp: Using
> Encoding : ISO-8859-1 when constructing PrintWriter instead of Servle
>tOutputStream
>Sun Apr 01 12:44:41 PDT 2001:<I> <ServletContext-General> *.jsp: initi
>alization complete
>Sun Apr 01 12:44:42 PDT 2001:<I> <ServletContext-General> looking for
>taglib uri /counter.tld as resource /WEB-INF/counter.tld in Web Applic
>ation root:
>Sun Apr 01 12:44:43 PDT 2001:<I> <ServletContext-General> Generated ja
>va file: D:\releases\510\myserver\classfiles\jsp_servlet\_pagehits.jav
>a
>Sun Apr 01 12:44:45 PDT 2001:<I> <ServletContext-General> file: init
>
>
>what's the change number you get from weblogic.Admin VERSION?
>
>
>--
>Kumar
>
>Mike Reiche wrote:
>
>> From the zip file.
>>
>> It has to be a jsp that references those tag libraries.
>> Other than that it works like a charm.
>>
>> Mike
>>
>> Kumar Allamraju <[email protected]> wrote:
>> >Did you extracted the SP9 zip or exe?
>> >I do not see the following errors when accessing a jsp with SP9? Could
>> >you tell us how to
>> >reproduce it?
>> >
>> >BTW, i will ask our docs folks to correct the startup scripts..
>> >
>> >--
>> >Kumar
>> >
>> >Mike Reiche wrote:
>> >
>> >> I had to remove the 'async' attribute from taglib.tld
>> >>
>> >> And when I use WLCS I have to remove it from weblogic.tld
>> >>
>> >> And the startup scripts provided do not include weblogic-tags-510.jar
>> >> in the classpath.
>> >>
>> >> Mike
>> >>
>> >> "Mike Reiche" <[email protected]> wrote:
>> >> >
>> >> >WLS 5.1, sp9 pre-release, solaris 2.7, WLCS 3.2
>> >> >
>> >> >JSP compile fails with the exception...
>> >> >
>> >> >weblogic.servlet.jsp.JspException: (line -1): Error in
>> >> >tag library
>> >> >at: 'wl':
>> >> >The Tag class 'weblogicx.jsp.tags.CacheTag' has no setter
>> >> >method
>> >> > corresponding to
>> >> >TLD declared attribute 'async', (JSP 1.1 spec, 5.4.1)
>> >> > at weblogic.servlet.jsp.StandardTagLib.jspException(StandardTagLib.java:138)
>> >> > at weblogic.servlet.jsp.StandardTagLib.processTag(StandardTagLib.java:264)
>> >> > at weblogic.servlet.jsp.StandardTagLib.processTagElements(StandardTagLib.java:146)
>> >> > at weblogic.servlet.jsp.StandardTagLib.<init>(StandardTagLib.java:125)
>> >> > at weblogic.servlet.jsp.JspLexer.loadTagLib(JspLexer.java:95)
>> >> > at weblogic.servlet.jsp.JspLexer.mTAGLIB_DIRECTIVE_BODY(JspLexer.java:3873)
>> >> > at weblogic.servlet.jsp.JspLexer.mTAGLIB_DIRECTIVE(JspLexer.java:3623)
>> >> > at weblogic.servlet.jsp.JspLexer.mDIRECTIVE(JspLexer.java:3484)
>> >> > at weblogic.servlet.jsp.JspLexer.mSTANDARD_THING(JspLexer.java:1817)
>> >> > at weblogic.servlet.jsp.JspLexer.mTOKEN(JspLexer.java:1658)
>> >> > at weblogic.servlet.jsp.JspLexer.nextToken(JspLexer.java:1548)
>> >> > at weblogic.servlet.jsp.JspLexer.parse(JspLexer.java:888)
>> >> > at weblogic.servlet.jsp.JspParser.doit(JspParser.java:69)
>> >> > at weblogic.servlet.jsp.JspParser.parse(JspParser.java:125)
>> >> > at weblogic.servlet.jsp.Jsp2Java.outputs(Jsp2Java.java:109)
>> >> > at weblogic.utils.compiler.CodeGenerator.generate(CodeGenerator.java:242
>> >
>
-
Help with JSP and logic:iterate
I have some queries hope someone can help me.
I have a jsp page call request.jsp:
====================================
<%@ page import="java.util.*" %>
<%@ taglib uri="/WEB-INF/struts-bean.tld" prefix="bean" %>
<%@ taglib uri="/WEB-INF/struts-logic.tld" prefix="logic" %>
<html>
<body>
<%@ page import="RequestData" %>
<jsp:useBean id="RD" class="RequestData" />
<%Iterator data = (Iterator)request.getAttribute("Data");%>
<logic:iterate id="element" name="RD" collection="<%=data%>">
<jsp:getProperty name="RD" property="requestID" />
<%=element%><br>
</logic:iterate>
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And I have the RequestData.java file:
======================================
private int requestID = 1234;
public int getRequestID() { return requestID; }
The jsp page display:
======================
0 RequestData@590510
0 RequestData@5b6d00
0 RequestData@514f7f
0 RequestData@3a5a9c
0 RequestData@12d7ae
0 RequestData@e1666
Seems like the requestID is not returned. Does anybody know this?
I have done the exact one using JSP and servlets, trying to learn using JSP and custom tags. The one with JSP and servlet looks like:
============================================
<%@ page import="RequestData" %>
<%Iterator data = (Iterator)request.getAttribute("Data");
while (data.hasNext()) {
RequestData RD = (RequestData)data.next();
out.println(RD.getRequestID() );
}%>Oh think I got it...
but one thing I'm not sure is...
If I use "<jsp:useBean id="RD" class="RequestData" />", do I still need "<%@ page import="RequestData" %>"?
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Experiences developing iViews with JSP tags
Hi,
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> if I declare all getters and setters of the bean with
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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
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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 -
Any help with this will be really appreciated. I'm new to programming.
If I search for an ssn in a database, I want to view all records relating to that ssn. However, I am getting all the records in the table.
eg.
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I would like to see
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Thanks.
Java Code
public void doGet(HttpServletRequest request,
HttpServletResponse response)
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JSP Code
<% while (MyTaxSuppress != null) { %>
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<% } // end of while loop %>I don't see anywhere in your code where you conditionally output a tuple from your database. You seem to be outputting everything.
Maybe you need:
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<TD><input TYPE="checkbox" name="<%=rowID %>" ></TD>
<% } %> -
Help with Creating 2 Libraries with iTunes
Hi - I'm looking to create and use 2 separate libraries with iTunes on the same computer. Background: I have a large collection now of lossless files (AIFF), both CD rips (16bit/44.1kHz) and higher resolution audio (24bit/96kHz), which are very large files I use for streaming to an audiophile system (via a Logitech Transporter to DAC/processor, etc.). I also have several iPods and an AppleTV I use that have music, applications, video, etc. I want to primarily use what I'll call the "high resolution" library that only needs the music files, but from time to time switch over to a 2nd library I'll call "other" (which would contain smaller compressed music files more suitable for ipod, as well as ipod app's, video content for AppleTV). I would periodically load up the "Other" library to sync up ipods and AppleTV, but the vast majority of the time have the "high res" library open (as the Logitech Squeezecenter music server requires iTunes to be open at the same time with the appropriate library).
So that's the background. Effectively just want to make a copy of the current library (to be "other"), downconvert all the music from the high res versions, make sure I keep all the apps and video, and clean up the original library. Couple questions - when running iTunes on the same computer with 2 different libraries (both can be on my iMac as I have a 1TB drive with adequate space for now), can I delete all the app's, AppleTV link, etc. from the "high res" library once copied? Also, what's the best method for copying the library (i.e., just create a new one and copy everything in with the appropriate preferences checked - "copy files to library"/"keep itunes folder organized"?)
Thanks for any thoughtsdon't worry glad to help
this could help you actually http://www.macosxhints.com/article.php?story=20051119134344700
but its very complicated and as i'm no expert in computer code i would wait to try it out before and expert in computer code has a look and see if its oky to use (you have to be VERY careful). By the way it comes from a trustworthy site so i'm sure its fine
just be careful though (look at the comments below
or this http://www.macosxhints.com/article.php?story=20050215130254540
this is different but might help http://www.macupdate.com/info.php/id/7689
Alex -
i have a dozen of asp pages which talk with MSSQL. I want to build an interactive menu with dozen of links ( probably like a tree structure with dozen nodes each pointing to these asp pages).
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this is a fragment of the jsp tag:
<ui:treeNode binding="#{Page1.treeNode1}" id="treeNode1" target="_parent" text="Tree Node 1" url="http://myserver/page1.asp">
how do i change the target attribute so that it opens the asp page in a new frame?Build a page with 2 frames with one frame's name as say "left" and the other as "right". Assuming that you would want your menu jsp on the left, set the src of that frame to your menu jsp. and set the target as target="right" (name of your right frame) instead of _parent..
-
JSP Tag Libraries - Useful or not?
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ThnxI know that taglibs can be very useful in at least two situations:
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2) For sophisticated JSP pages it can be very useful to encapsulate repetitive and code-intensive functionality in tags as well, because this makes maintenance of your pages simpler (thus cheaper, since you spend less time on it). -
I have 3 pages ...1) index.jsp 2) Forward.jsp 3) welcome.jsp
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<jsp:forward page="welcome.jsp" />
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As i saw it will display the contents of Welcome.jsp page in itself...
Please let me know...
Regards
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<%= custVal.getCustomerNumber() %>
- In WLS, what shows in the text field on the form is nothing, because
customer number in the custVal object is null (default for a String)..this
is what I want.
- In Tomcat, what shows it the word "null".
...here is the weird part, by changing from scriptlet references to the
<jsp:getProperty....> format such as....
<jsp:getProperty name="custVal" property="customerNumber"/>
-In WLS, he is still a happy camper and works just fine regardless of how I
reference the bean
-In Tomcat, I also get the correct results that I want.
So, unlike most postings, I found out how to fix it but I would like to know
why...any ideas?
Thanks in advance,
Paul Reed
www.jacksonreed.com
object training and mentoring
Jackson-Reed, Inc. 888-598-8615
www.jacksonreed.com
Author of "Developing Applications with Visual Basic and UML"
http://www.amazon.com/exec/obidos/ASIN/0201615797/jackreedinc/104-0083168-31
95939
Author of "Developing Applications with Java
Try http://localhost:7001/HelloWorld.jsp
"b. patel" <[email protected]> wrote:
>
>I need help with running a simple JSP. I created a WLS domain using the
>WebLogic
>Configuration Wizard. I am trying to access HelloWorld.jsp which is
>located under
>C:\bea\user_projects\wlsdomainex\applications\DefaultWebApp.
>I type
>http://localhost:7001/DefaultWebApp/HelloWorld.jsp. I get 404 - Page
>Not Found
>Error. The weblogic server starts Succesfully. I am trying this in Win
>2K environment.
>
>I am new to WebLogic. Thanks for your Help in advance.
>
-
Problem with jsp tag in jsf file c:import
<!-- <c:import url="#{backing_Home.whichMenu}"/>-->
<jsp:include page="#{backing_Home.whichMenu}"/>
I am trying to use a JSF variable in jsp tag
I am getting error like this
javax.servlet.jsp.JspTagException: /#{backing_Home.whichMenu} at org.apache.taglibs.standard.tag.common.core.ImportSupport.acquireString(ImportSupport.java:318) at org.apache.taglibs.standard.tag.common.core.ImportSupport.doEndTag(ImportSupport.java:186) at _Home_2e_jsp._jspService(Home.jsp:24) I want to add a page dynamically using that variable
Is there any other methodThis code works fine for me:
<%@ taglib uri="/jstl-c" prefix="c" %>
<html>
<body>
<%
int array[] = new int[] {1,2};
session.setAttribute("array", array);
String arrayNames[] = new String[]{"One", "Two"};
session.setAttribute("arrayNames", arrayNames);
%>
<form action="?">
<select name="select">
<c:forEach items='${ sessionScope.array}' var="row">
<c:choose>
<c:when test="${param.select== row}"> >
<option value="<c:out value='${row}'/>" selected><c:out value="${sessionScope.arrayNames[row-1]}"/></option>
</c:when>
<c:otherwise>
<option value="<c:out value='${row}'/>"><c:out value="${sessionScope.arrayNames[row-1]}"/></option>
</c:otherwise>
</c:choose>
</c:forEach>
</select>
<input type="submit" name="submit" value="submit"></input>
</form>
</body>
</html>
good luck.
MatrixPooh
www.bizdisplay.com -
I was ask to create an ad banner, I need help with how to track the web click on it, is it what the clicktag is for. What should I do, insert that code but where ?
Create Clicktag AS 2.0
1. Create animation
2. Add new layer to very top of timeline. (must be at top) Label "clicktag" or Inv button. (It doesn't really matter what you label it)
3. On first frame of this layer draw rectangle to cover full stage (may go beyond stage dimensions)
4. Rectangle must have a fill color. You may delete frame around the box. (Make sure alpha slider has some fill percentage before you draw rectangle to enable fill)
5. Convert this box to a button symbol. Name clicktag (or button)
6. Double click on this button or get to edit mode. Select color fill with solid arrow. Click on Properties panel/Fill color and adjust alpha to 0%.
7. Go back to Scene. Click on first frame of clicktag layer. Select the now invisible button by surrounding with solid arrow tool.
8. Select properties panel and click on arrow in circle to get Actions panel.
9. Make sure Actions panel says ACTIONS-BUTTON at top of panel.
10. Add coding from below:
on (release) {
getURL (_level0.clickTag, "_blank");
11. Send swf/html files along with your target URL to publication
Good luck
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