Iteration Tag Library and Page Context

          When I update a class members in PageContext scope it does not get reflected in
          the loop in tag library. It keeps the original value.
          I am using WebLogic Server 6.1 SP1

java.lang.NullPointerException at
oracle.jsp.parse.JspDirectiveTaglib.validateAttributes(JspDirectiveTaglib.java:183)
at oracle.jsp.parse.JspParseTagDirective.validateTagAttributes(JspParseTagDirective.java:180)That NullPointerException does not sound right. What is your oc4j version?
By the way, your declaration of taglib in web.xml can be deleted if you are not using that taglib-uri "/kw" in your jsp.

Similar Messages

Aperture3 library and Pages

I am unable to access my aperture library from the new version of Pages.
Has anyone any surgestions ?

stirling-dad wrote:
I ... was hoping that running the update again would get me a clean copy
and i was hoping it would replace any corrupted and install any missing files
What can I do now?
don't know what to suggest - short of reinstalling OS X ...
hopefully another user comes up with a brighter idea.
best of luck !
JGG

JavaBeans and Tags in JSP pages

I have a java package and some code that already works but I need to "Webify" it. I have heard the words Tag Libraries and Beans to use with JSP pages instead of writing out the java code in the page. I have read the tutorial on Tag Libraries and it still makes no sense. I need some kind of beginners guide and instruction. I already have the java in the .jar file and have Tomcat setup. I know I need to make a tag library and stuff, but beyond that I'm a bit lost. I'm just not sure where to put what. Also, I did do a practice JSP page but it won't automatically find the jar file - they are in the WEB-INF/lib directory. I actually have to set the CLASSPATH separately by doing export CLASSPATH=.... which I know can't be right - is there a way to do this in the actual JSP program itself - like set the classpath just for that webpage?

Here's a good basic tutorial that helped me when I was getting started with tags:
http://www.theserverside.com/resources/article.jsp?l=JSP-XML3

Paging using page tag Library

My JSP is using page tag Library. When I click the Next page it returns next page. How can I change my JSP using page tag so that when the next/previous link is clicked, I should see the next/previous 10 records and so on.
Thanks in advance

Unfortunately my mind reading powers are not working so well right now.
Which page tag library are you using? There are several.
I would suggest that you look at the documentation for that library.
Unless you show us what the code you are currently using is, we can't suggest changes.
Oh, and please don't just copy paste your whole JSP here. A relevant excerpt of how you are using the tag library and how you create the links should be more than enough. And please use code tags.

How can i use tag library in the mvc?

hello
in some tag libraris such as jakarta tag library and jrun tag library,there is database
access tag, it provide convenient function to access database from jsp page,but i wonder how can i use such a tag within MVC architecture.
as we know,in MVC architecture,all requests from the jsp pages are submit to the controller servlet,then the controller manipulate ejb to access database,it don't allow the database access from the jsp page.
who can tell me how can i combine the tag library with mvc architecture appropriately?
thank you!

You can't! If you decide to limit the JSP to be part of the View component, obviously you should not include tags that directly access the database. If the strict MVC architecture is less important to you, then the tags can save coding time. It's your choice.

How to use a tag library in multiple web applications?

Morning all,
Environment: Tomcat 5 on Apache2 using Mod_JK connector on Windows XP
I have developed a custom tag library and tested it out and its working great.
Now, How do I use in my other web applications? Do I need to copy the JAR file to webapps\app1\WEB-INF\lib, webapps\app2\WEB-INF\lib etc directories?
The problem with this approach is, if I happen to change the tag library code, I will have to make sure that I remember to copy the new JAR file to the above mentioned directories. Ofcourse I can write a simple ant script that would do it for me, but I was wondering if there was an efficient and yet simple way of achieving the same.
Thanks in advance,
Joe

Thanks Vidyut! You've answered my question.
I placed the jar file in the $CATALINA_HOME/shared/lib directory. But where should I place the taglib TLD file? And how should I reference it in web.xml?
Currently, my web.xml is as follows and it doesn't work.
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE web-app
PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
<taglib>
<taglib-uri>http://abc.com</taglib-uri>
<taglib-location>c:\Tomcat\shared\lib\mytags-taglib.tld</taglib-location>
</taglib>
</web-app>
Thanks again!
Joe

Error when using tag library !

Hi,
 I am trying to run a JSP in weblogic which makes use of tag library in it. I am getting the following error
 C:\bea\weblogic81\samples\domains\examples\.\examplesServer\.wlnotdelete\extract\examplesServer_Bidla_Bidla\jsp_servlet\_registration\__finish.java:192: cannot resolve symbol
 probably occurred due to an error in /Registration/Finish.jsp line 29:
 <as:email>
 Corresponding Full compiler error(s): is
 C:\bea\weblogic81\samples\domains\examples\.\examplesServer\.wlnotdelete\extract\examplesServer_Bidla_Bidla\jsp_servlet\_registration\__finish.java:192: cannot resolve symbol
 symbol : variable EVAL_BODY_BUFFERED
 location: interface javax.servlet.jsp.tagext.BodyTag
 if (_int0 == BodyTag.EVAL_BODY_BUFFERED) { //[ /Registration/Finish.jsp; Line: 29]
 ^
 I have 10 errors like this, just for simplicity, I haven't posted them all.
 The JSP runs fine with Tomcat.
 I don't have servlet.jar anywhere in my classpath nor in my application\WEB-INF\lib
 Please help.
 Thanks !

Problem solved when i made the jar file of class files in my tag library and placed the jar file in application\WEB-INF\lib
 Thanks !

Tag Library for Declarative Component

Hi
Using JDev 11gR1. I'm new to tag libraries and have the following question...
How do I deploy a JAR file with a declaritive component as a JSP tag Library? I have created a new project, created a new tag library in the project (.tld file) and created a reusable toolbar in the project. How do I include the tags and attributes of the declarative component in the .tld file? Do I just edit the file or have I missed some steps which would have done this.
When creating the new declarative component I did us the "Add Tag Library..." button to specify the tag library in the project.
All declaritive component examples / tutorials / blogs / ADF dev guide, I find just tell you to deploy the jar file as a tag library and include it in the project to use it, but I can't find anything telling you how to deploy it as a tag library. Any help or references to examples will be great.
Thanks
Mario

Shay, thanks for the reply.
I started off following Grant's article which you referred me to, but ran into the problem I'm having now. Just tried it again and still no luck.
I created a declarative component in a new project, setup the deployment profile to deploy to an ADF Library JAR and deployed it. Then I add the directory for the JAR to my Resource palette and add the JAR to the project which will be using it.
But that's as far as I get, still nothing shows in my Component Palette.
That's when I started on the wild goose chase of the TLD file. I looked at Andrejus' blog posting, [http://andrejusb.blogspot.com/2009/10/custom-declarative-components-in-adf.html| [http://andrejusb.blogspot.com/2009/10/custom-declarative-components-in-adf.html|http://andrejusb.blogspot.com/2009/10/custom-declarative-components-in-adf.html]] and the source and realised he has a tld file inside his generated JAR. Which lead to my question as to when this get's generated / defined?
Any ideas what I could try to get my Components to display in the Component Palette?
Thanks,
Mario
Edited by: Mario Ribeiro on Oct 28, 2009 10:10 AM

Connection Pooling and JSP Custom Tag Library - is code (inside) the best way/correc?

Hi, can anyone advise as to whether my tag library code (based
on Apache Jakarta Project) will actually achieve connection
pooling functionality across my entire JSP based application? I
am slightly concerned that my OracleConnectionCacheImpl object
may exist multiple times, hence rendering my conection pooling
attempt useless.
package com.solved.tag.dbtags.connection;
import java.io.IOException;
import java.sql.Connection;
import java.sql.SQLException;
import javax.servlet.jsp.tagext.TagSupport;
import javax.servlet.jsp.JspTagException;
import javax.sql.DataSource;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import oracle.jdbc.pool.OracleConnectionCacheImpl;
* JSP tag connection, used to get a
* java.sql.Connection object.
* JSP Tag Lib Descriptor
* <pre>
* <name>connection</name>
<tagclass>com.solved.tag.dbtags.connection.ConnectionTag</t
agclass>
* <bodycontent>JSP</bodycontent>
<teiclass>com.solved.tag.dbtags.connection.ConnectionTEI</t
eiclass>
* <info>Opens a connection based on a jndiName.</info>
* <attribute>
* <name>id</name>
* <required>true</required>
* <rtexprvalue>false</rtexprvalue>
* </attribute>
* </pre>
* @author Matt Shannon
public class ConnectionTag extends TagSupport {
static private OracleConnectionCacheImpl cache = null;
public int doStartTag() throws JspTagException {
try {
Connection conn = null;
if (cache == null) {
try {
InitialContext ic = new InitialContext();
DataSource ds = (DataSource) ic.lookup
("jdbc/pool/OracleCache");
cache = (OracleConnectionCacheImpl)ds;
catch (NamingException ne) {
throw new JspTagException(ne.toString());
conn = cache.getConnection();
pageContext.setAttribute(getId(),conn);
catch (SQLException e) {
throw new JspTagException(e.toString());
return EVAL_BODY_INCLUDE;
package com.solved.tag.dbtags.connection;
import java.sql.Connection;
import java.sql.SQLException;
import javax.servlet.jsp.tagext.TagSupport;
* JSP tag closeconnection, used to close the
* specified java.sql.Connection.
* JSP Tag Lib Descriptor
* <pre>
* <name>closeConnection</name>
<tagclass>com.solved.tag.dbtags.connection.CloseConnectionTag&
lt;/tagclass>
* <bodycontent>empty</bodycontent>
* <info>Close the specified connection. The "conn"
attribute is the name of a
* connection object in the page context.</info>
* <attribute>
* <name>conn</name>
* <required>true</required>
* <rtexprvalue>false</rtexprvalue>
* </attribute>
* </pre>
* @author Matt Shannon
* @see ConnectionTag
public class CloseConnectionTag extends TagSupport {
private String _connId = null;
* The "conn" attribute is the name of a
* page context object containing a
* java.sql.Connection.
* @param connectionId
* attribute name of the java.sql.Connection to
close.
* @see ConnectionTag
public void setConn(String connectionId) {
_connId = connectionId;
public int doStartTag() {
try {
Connection conn = (Connection)pageContext.getAttribute
(_connId);
conn.close();
} catch (SQLException e) {
// failing to close a connection is not fatal
e.printStackTrace();
return EVAL_BODY_INCLUDE;
public void release() {
_connId = null;
package com.solved.tag.dbtags.connection;
import javax.servlet.jsp.tagext.TagData;
import javax.servlet.jsp.tagext.TagExtraInfo;
import javax.servlet.jsp.tagext.VariableInfo;
* TagExtraInfo for the connection tag. This
* TagExtraInfo specifies that the ConnectionTag
* assigns a java.sql.Connection object to the
* "id" attribute at the end tag.
* @author Matt Shannon
* @see ConnectionTag
public class ConnectionTEI extends TagExtraInfo {
public final VariableInfo[] getVariableInfo(TagData data)
return new VariableInfo[]
new VariableInfo(
data.getAttributeString("id"),
"java.sql.Connection",
true,
VariableInfo.AT_END
data-sources.xml:
<?xml version="1.0"?>
<!DOCTYPE data-sources PUBLIC "Orion data-
sources" "http://xmlns.oracle.com/ias/dtds/data-sources.dtd">
<data-sources>
<data-source
class="oracle.jdbc.pool.OracleConnectionCacheImpl"
name="jdbc/pool/OracleCache"
location="jdbc/pool/OracleCache"
url="jdbc:oracle:thin:@oracle1:1521:pdev"
>
<property name="maxLimit" value="15" />
<property name="cacheScheme" value="2" />
<property name="user" value="console" />
<property name="password" value="console" />
<description>
This DataSource is using an Oracle-native DataSource Class so as
to allow Oracle Specific extensions.
A getConnection() call on this DataSource will return
oracle.jdbc.driver.OracleConnection.
The connection returned is a logical connection.
The caching scheme in place is Fixed Wait. Refer below to
possible values.
Dynamic 1
Fixed Wait 2
Fixed Return Null 3
</description>
</data-source>
</data-sources>
many thanks,
Matt.

Hi. Show me your pool definition.
Joe
Ramamurthy wrote:
I am using the jsp custom tag library from BEA called sqltags.tld which came with Weblogic 5.1. Currently I am using Weblogic6.1 sp2 on Solaris.
I have created a Connection Pool for Sybase database using the driver com.sybase.jdbc.SybDriver.
When I created jsp page to connect to the connection pool using sqltags custom tag library, I am getting the error
"javax.servlet.jsp.JspException: Failed to write body content
at weblogic.taglib.sql.ConnectionTag.doAfterBody(ConnectionTag.java:43)
at jsp_servlet.__hubwcdata._jspService(__sampletest.java:1014)"
After this message, whenever I try to access the same jsp page I am getting the message
"javax.servlet.jsp.JspException: Failed to load JDBC driver: weblogic.jdbc.pool.D
river
at weblogic.taglib.sql.ConnectionTag.doStartTag(ConnectionTag.java:34)
at jsp_servlet.__hubwcdata._jspService(__sampletest.java:205)".
Can you please help me the reason why this problem is happening and how to fix this ?
This problem doexn't happen consistently. This occurs once in a while.
I tried to increase Login delay Seconds parameter in the Connection Pool to 15 sec. It didn't help me much.
Thanks for your help !!!
Ram

Using Display tag library - sorting and Paging

I have generated a grid using this tag library which has number of in built features. Out of which on is grid sorting and pagination. But this sorts the grid in one page only, not complete grid. Does any one have solution for this? I am trying to get the source code which does this. If any one has solution then please help me..
Thanks!

In this case you have to do external sorting insted of defalutsorting provided by dispaly Tag Library. find sample code for External Sorting.
Follow the Steps:
<display:table name="testList" {color:#ff0000}sort="external"{color} defaultsort="1" id="empTable">
<display:column property="id" title="ID" sortable="true" {color:#ff0000}sortName="id"{color} />
<display:column property="firstName" sortable="true" title="First Name" />
<display:column property="lastName" sortable="true" title="Last Name" />
<display:column property="address" sortable="true" title="Email Address"/>
</display:table>
To determine the request parameter name for column(like ID) sorting you can do :
String studenid = request.getParameter((new ParamEncoder("empTable")).encodeParameterName(TableTagParameters.PARAMETER_SORT))
fire a query in DAO Class using request parameter to get sorted list and map a resultset to table.
Thanks,
thagelapally
Edited by: Thagelapally on Jul 22, 2009 4:29 AM
Edited by: Thagelapally on Jul 22, 2009 4:32 AM

Pager Tag Library & JSLT

Hi
I try to incorporate paging in my web application and I find Pager Tag Library in http://jsptags.com/tags/navigation/pager/index.jsp.
Here is my code
<%@ taglib uri="http://jsptags.com/tags/navigation/pager" prefix="pg" %>
<%-- Retrieve data--%>
<sql:query var="date_data" dataSource="${ds}">
 select *
 from pdate
</sql:query>
<html>
<pg:pager maxPageItems="2">
 <pg:item>
 <c:forEach items="${date_data.rows}" var="row">
 <c:out value="${row.product}"/>
 </c:forEach>
 </pg:item>
 <pg:index>
 <pg:first>
 <a href="<%= pageUrl %>">[ (<%= pageNumber %>) |< Previous ]</a>
 </pg:first>
 <pg:prev>
 <a href="<%= pageUrl %>">[ (<%= pageNumber %>) << Previous ]</a>
 </pg:prev>
 <pg:pages>
 <a href="<%= pageUrl %>"><%= pageNumber %></a>
 </pg:pages>
 <pg:next>
 <a href="<%= pageUrl %>">[ Next >> (<%= pageNumber %>) ]</a>
 </pg:next>
 <pg:last>
 <a href="<%= pageUrl %>">[ Last >| (<%= pageNumber %>) ]</a>
 </pg:last>
</pg:index>
</pg:pager>I don�t understand what values the pageUrl expression must have.
I change all <%= pageUrl %> with numbers and string in order to experiment but the result is just the <c:out value="${row.product}"/> and no paging.
What should be done in order to work?
Thanks

You could rewrite the component's renderer class

Pager tag library

The Pager Tag Library is the easy and flexible way to implement paging of large data in JavaServer Pages (JSP). and we can display something like
1 2 3 4......
How can we display
A B C D E.....
instead of
1 2 3 4 .....

You could rewrite the component's renderer class

Tag library 'not found' in jsp page. why?

I'm having a big problem with jsp/tag libraries using oc4j. One
particular
tag library is not being 'found' for some mysterious reason. The
particulars follow:
kwTags.jar is the jar file containing the tag classes. It definitely
exists in WEB-INF/lib directory.
tld def. in web.xml:
<taglib>
<taglib-uri>/kw</taglib-uri>
<taglib-location>/WEB-INF/tlds/kwTagLib.tld</taglib-location>
</taglib>
The tld file definitely exists in the /WEB-INF/tlds directory.
The definition of the tag lib at the top of the kwTagLib.tld follows:
<taglib>
<tlib-version>1.0</tlib-version>
<jsp-version>1.2</jsp-version>
<short-name>kw</short-name>
<uri>/kw</uri>
<display-name>kwTagLib</display-name>
<small-icon></small-icon>
<large-icon></large-icon>
<description></description>
The tag reference in jsp page is:
<%@ taglib uri="/WEB-INF/tlds/kwTagLib.tld" prefix="kw" %>
The development environment is Eclipse Workbench 5.1.0 and Eclipse
v.3.2.1
JDK is: j2sdk1.4.2_04
All other tag libs (Struts v.1.3.5) are found and work correctly. This
is the only tag library that
a problem.
Error Message follows:
java.lang.NullPointerException at
oracle.jsp.parse.JspDirectiveTaglib.validateAttributes(JspDirectiveTaglib.java:183)
at
oracle.jsp.parse.JspParseTagDirective.validateTagAttributes(JspParseTagDirective.java:180)
at oracle.jsp.parse.JspParseTag.parse(JspParseTag.java:921)
at
oracle.jsp.parse.JspParseTagDirective.parse(JspParseTagDirective.java:326)
at oracle.jsp.parse.JspParseTag.parseNextTag(JspParseTag.java:705)
at oracle.jsp.parse.JspParseTagFile.parse(JspParseTagFile.java:184)
at oracle.jsp.parse.OracleJsp2Java.transform(OracleJsp2Java.java:154)
at
oracle.jsp.runtimev2.JspPageCompiler.attemptCompilePage(JspPageCompiler.java:428)
at
oracle.jsp.runtimev2.JspPageCompiler.compilePage(JspPageCompiler.java:284)
at
oracle.jsp.runtimev2.JspPageInfo.compileAndLoad(JspPageInfo.java:483)
at
oracle.jsp.runtimev2.JspPageTable.compileAndServe(JspPageTable.java:542)
at oracle.jsp.runtimev2.JspPageTable.service(JspPageTable.java:305)
at oracle.jsp.runtimev2.JspServlet.internalService(JspServlet.java:509)
at oracle.jsp.runtimev2.JspServlet.service(JspServlet.java:413)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at
com.evermind.server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:810)
at
com.evermind.server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:322)
at
com.evermind.server.http.ServletRequestDispatcher.forward(ServletRequestDispatcher.java:251)
at
org.apache.struts.chain.commands.servlet.PerformForward.handleAsForward(PerformForward.java:99)
at
org.apache.struts.chain.commands.servlet.PerformForward.perform(PerformForward.java:82)
at
org.apache.struts.chain.commands.AbstractPerformForward.execute(AbstractPerformForward.java:51)
at
org.apache.struts.chain.commands.ActionCommandBase.execute(ActionCommandBase.java:48)
at org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:190)
at
org.apache.commons.chain.generic.LookupCommand.execute(LookupCommand.java:304)
at org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:190)
at
org.apache.struts.chain.ComposableRequestProcessor.process(ComposableRequestProcessor.java:280)
at
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1858)
at
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:459)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at
com.evermind.server.http.ResourceFilterChain.doFilter(ResourceFilterChain.java:65)
at
org.tuckey.web.filters.urlrewrite.UrlRewriteFilter.doFilter(UrlRewriteFilter.java:738)
at
com.evermind.server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:649)
at
com.evermind.server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:322)
at
com.evermind.server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:790)
at
com.evermind.server.http.HttpRequestHandler.run(HttpRequestHandler.java:270)
at
com.evermind.server.http.HttpRequestHandler.run(HttpRequestHandler.java:112)
at
com.evermind.util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:192)
at java.lang.Thread.run(Thread.java:534)

java.lang.NullPointerException at
oracle.jsp.parse.JspDirectiveTaglib.validateAttributes(JspDirectiveTaglib.java:183)
at oracle.jsp.parse.JspParseTagDirective.validateTagAttributes(JspParseTagDirective.java:180)That NullPointerException does not sound right. What is your oc4j version?
By the way, your declaration of taglib in web.xml can be deleted if you are not using that taglib-uri "/kw" in your jsp.

Pagination using pager tag library (logical groupings)

I'm currently trying to achieve pagination using the pager tag library provided by jsptags.com.
Instead of the usual breaking up the records into a fix number to be displayed per page, I need to display these records by grouping per page. E.g., my records are grouped by countries, so each group varies in size.
I would not be accessing the database directly from the JSP page, in fact, the JSP page will get a collection of the objects that I want to display per page.
Has anyone done anything like this before? Would appreciate very much if you could share with me how you implement this.
Thanks!

Hi there,
I am wondering if you found the solution for your question with paging in JSP. if so i will really appreciate if you can let me know, how you did it. I am using Pager tag lib from JSPTags as well and i used collection object to iterate through. But i have some problems. I am wondeinf if you can help me with this
Thanks
Vik

Help with Pager Tag Library

I am developing a photo website with the JSP Pager Tag Library (http://jsptags.com/tags/navigation/pager/index.jsp). I have installed it and am using it successfully.
I have one question.
I have a page called view_fotos.jsp. This page has the pager tag to display the photos in a series of pages. view_fotos.jsp can accept a variety of parameters.
For example:
view_fotos.jsp?groupnum=10
view_fotos.jsp?groupnum=10&user=john
view_fotos.jsp?user=john&mode=view
Now, I would like to add the QueryString to all the indexed page links.
i.e. The page links should become...
view_fotos.jsp?groupnum=10&pager.offset=0
view_fotos.jsp?groupnum=10&pager.offset=6
view_fotos.jsp?groupnum=10&pager.offset=12
or
view_fotos.jsp?groupnum=10&user=john&pager.offset=0
view_fotos.jsp?groupnum=10&user=john&pager.offset=6
view_fotos.jsp?groupnum=10&user=john&pager.offset=12
depending on the request's QueryString. Can anyone please let me know how can I accomplish that?
Thanks for your kind help!
Regards,
Joe

Take a look at the docs on the pg:param tag. Those parameters will make it on the end of your URL. You might also have to export the offset variable in the pg:pager tag so that you can use it later with <%=offset%> but I think if you set the max items per page part of pg:pager to 6, it will do the offset stuff for you. The docs for the pager tag library should have more info though. That's found at http://jsptags.com/tags/navigation/pager/index.jsp along with the download.

Iteration Tag Library and Page Context

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