Custom tag help

Hi there,
I was wondering if someone might help me construct a custom tag handler class that either allows or denies access to a given JSP page? I'll start by showing the code I want to replace in all my JSP pages:
<%
String companyID = (String)session.getAttribute("companyID");
String administratorID = (String)session.getAttribute("administratorID");
if(companyID == null || administratorID == null)
     out.println(ServletUtilities.headWithTitle("ACCESS DENIED") +
    <body><h1>ACCESS DENIED</h1><a href=\"/scholastic/Login.jsp\">Return to Login Page</a></body></html>");
     return;
else
%>What this code is doing is extracting from the session object the companyID and administratorID. Both of these were placed into the session object when the user logged into the system. As we know, when a session times out, these IDs no longer exist, thus I test for null. If either value is null, then I create HTML markup that instructs the user to login again.
So, what would be better is a custom tag that I can call just once, like so:
<%@ taglib uri="stlib-taglib.tld" prifix="stlib" %>
<stlib:allow_admin_access />
The behaviour I want is to prevent the rest of the JSP from loading if the custom tag is unable to obtain the companyID and administratorID from the session object.
I've not create custom tags before and would like some guidance on the tag handler class. Perhaps declare it:
public class AllowAdminAccess extends TagSupport
public int doStartTag(){...}
public int doEndTag(){...}
}Please advise,
Alan

Ok, I obtained a tutorial I found on the net and am trying to make it work on my application. So far, this is what I have:

<filter>
      <filter-name>AccessFilter</filter-name>
      <filter-class>mvcs.AccessFilter</filter-class>
      <description>This filter attempts of obtain a User object from the HttpSession. The User object would have been placed their identifying the user when he/she logged in. If it doesn't exist, the session has probably timed out, or this is an unauthorized user. If the User object is null the person is redirected to the Login.jsp page.</description>
      <init-param>
        <param-name>login_page</param-name>
        <param-value>/scholastic/Login.jsp</param-value>
      </init-param>
    </filter>
    <filter-mapping>
         <filter-name>AccessFilter</filter-name>
         <url-pattern>/*</url-pattern>
    </filter-mapping>

import java.io.IOException;
import javax.servlet.*;
import javax.servlet.http.*;
public class AccessFilter implements Filter {
protected FilterConfig filterConfig;
private final static String FILTER_APPLIED = "_filter_applied";
public void init(FilterConfig config) throws ServletException {
    this.filterConfig = config;
public void doFilter(ServletRequest request, ServletResponse response,
                   FilterChain chain) throws IOException, ServletException
    boolean authorized = false;
    // Ensure that filter is only applied once per request.
    if (request.getAttribute(FILTER_APPLIED) == null)
      request.setAttribute(FILTER_APPLIED, Boolean.TRUE);
      if(request instanceof HttpServletRequest)
        HttpSession session = ((HttpServletRequest)request).getSession(false);
        if(session != null)
          User user = (User)session.getAttribute("scholastic.tracks.user");
          if(user != null)
             authorized = true;
    if(authorized)
      chain.doFilter(request, response);
      return;
    else if(filterConfig != null)
      String login_page = filterConfig.getInitParameter("login_page");
      System.out.println("login_page: " + login_page);
      if(login_page != null && !login_page.equals(""))
        System.out.println("Step1");
        filterConfig.getServletContext().getRequestDispatcher(login_page).forward(request, response);
        System.out.println("Step2");
        return;
    throw new ServletException("Unauthorized access, unable to forward to login page");
public void destroy() { }
}The directory structure for my application goes like this:
webapps/scholastic/Login.jsp
webapps/scholastic/*.jsp
webapps/scholastic/admin/*.jsp
webapps/scholastic/WEB-INF/classes/servlets.class
Now, when I launch the browser and try to go to http://localhost:8080/scholastic/Login.jsp AccessFilter kicks in and since there is no User object in the session object yet, authorized will remain false. The logic continues to the line:
filterConfig.getServletContext().getRequestDispatcher(login_page).forward(request, response);
But in the end I wind up with a Page Not Found 404 error.
I tried changing the <param-value>/scholastic/Login.jsp</param-value> to just <param-value>/Login.jsp</param-value> but this resulted in an endless loop condition with the Tomcat container. "/scholastic/Login.jsp" is the correct relative URL. So I'm stuck at this point.
Please advise,
Alan

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Would you like to know a fine workaround?
If you have in your jsps a reference to the tld like this:
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Bye,
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"marco" <[email protected]> ha scritto nel messaggio
news:cfhrgj$bcj$[email protected]..
> Davis,
> thanks for the reply. I followed your suggestion and now I am able to see
> the code assist working.
> I am currently using the lomboz editor, but one thing that is missing in
> lomboz and is present in the structured editor (and in Intellij Idea) is
the
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Perhaps
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usefull!
>
> As a first impression, I can only make a lot compliments to both
> contributions (ObjectWeb and IBM).
>
> Bye,
> Marco.
>
>
> "David Williams" <[email protected]> ha scritto nel messaggio
> news:[email protected]..
> >
> > No, you're not missing anything. Its just with that version of code the
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Of
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see
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>
>

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I'm having a problem with a custom tag class, and I'm not sure whether it's because I'm doing something wrong, or because I'm running into a bug with Tomcat, JDK1.4b2, or something else. Basically, I'm finding that the pageContext object is null in the constructor of a custom tag class... something that I'm pretty sure is NOT supposed to happen.
I'm running JDK1.4b2 with Forte CE 3.1 (the bug predates the jumbo fix that brought it up to 3.0) and using Forte's embedded Tomcat.
I'm not sure whether it matters, but here's the sequence of events:
A servlet gets launched,
instantiates an object of type Error_list,
binds Error_list to the request object, and
forwards to a JSP that uses the custom tag defined by ListErrorsTag.
Unfortunately, pageContext is null in ErrorListTag's constructor, so the attempt to get the request object from the pageContext object generates a NullPointerException.
The SERVLET: *****************************************
// relevant lines from the servlet instantiating the object, binding it, and forwarding...
     Error_list errors = new Error_list("BAD_THINGS", "crash and burn");
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The JSP: ************************************************
In the JSP "admin_category_create.jsp" itself, I specify the taglib:
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and reference it:
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The Explosion of the Taglib: ************************
// beginning of Taglib class:
public class ListErrorsTag extends BodyTagSupport {
    private Error_list errors;
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The Result: **************************************
Tomcat's error log:
uh oh! pageContext is null
boom!
if I eliminate the try/catch and allow the NullPointerException to take place, I get:
Error: 500
Location: /admin_category_create.jsp
Internal Servlet Error:
javax.servlet.ServletException
     at org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:459)
     at _0002fadmin_0005fcategory_0005fcreate_0002ejspadmin_0005fcategory_0005fcreate_jsp_0._jspService(_0002fadmin_0005fcategory_0005fcreate_0002ejspadmin_0005fcategory_0005fcreate_jsp_0.java:338)
     at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:119)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at org.apache.jasper.servlet.JspServlet$JspServletWrapper.service(JspServlet.java:177)
     at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:318)
     at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:391)
     at org.netbeans.modules.web.tomcat.JspServlet.service(JspServlet.java:91)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:404)
     at org.apache.tomcat.core.Handler.service(Handler.java:286)
     at org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
     at org.apache.tomcat.facade.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:194)
     at admin.processRequest(admin.java:126)
     at admin.doPost(admin.java:144)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:404)
     at org.apache.tomcat.core.Handler.service(Handler.java:286)
     at org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
     at org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:797)
     at org.apache.tomcat.core.ContextManager.service(ContextManager.java:743)
     at org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:210)
     at org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:416)
     at org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:498)
     at java.lang.Thread.run(Thread.java:539)
Root cause:
java.lang.NullPointerException
     at AdminTags.ListErrorsTag.(ListErrorsTag.java:32)
     at _0002fadmin_0005fcategory_0005fcreate_0002ejspadmin_0005fcategory_0005fcreate_jsp_0._jspService(_0002fadmin_0005fcategory_0005fcreate_0002ejspadmin_0005fcategory_0005fcreate_jsp_0.java:272)
     at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:119)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at org.apache.jasper.servlet.JspServlet$JspServletWrapper.service(JspServlet.java:177)
     at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:318)
     at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:391)
     at org.netbeans.modules.web.tomcat.JspServlet.service(JspServlet.java:91)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:404)
     at org.apache.tomcat.core.Handler.service(Handler.java:286)
     at org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
     at org.apache.tomcat.facade.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:194)
     at admin.processRequest(admin.java:126)
     at admin.doPost(admin.java:144)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:404)
     at org.apache.tomcat.core.Handler.service(Handler.java:286)
     at org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
     at org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:797)
     at org.apache.tomcat.core.ContextManager.service(ContextManager.java:743)
     at org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:210)
     at org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:416)
     at org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:498)
     at java.lang.Thread.run(Thread.java:539)

Doing a little more experimentation, I discovered that pageContext is null in the constructor, but not null in the otherDoStartTagOperations() method (called by the doStartTag() method of the tag's class... it's something Forte forces you to do).
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On a related topic, is there documentation somewhere as to what, exactly, Forte is doing behind the scenes when it's managing a taglib (how it keeps track of them, where it puts config files, how the entries it makes in them are different or extended from the normal layout, etc.)? At the moment, I suspect that half of the grief I'm having with writing taglibs is caused by Forte itself forcing me to do things in a roundabout way that bears little resemblance to the ways shown in different books on the topic (and in fact all but ensures that nearly every published example will fail and require major rewriting because of the way it forces tag classes to be structured), but I don't see any easy way to let Forte handle compiling the classes and testing them with its embedded Tomcat, but do the config file housekeeping myself I can be in control of it.

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import java.sql.*;
import java.lang.Integer;
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                out.print("No Results!");
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            out.print("<tr>\n");
            out.print("<th>Name</th>\n");
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            out.print("</tr>\n");
            while(rs.next())
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                out.print("<td>" + rs.getString("Name") + "</td>\n");
                out.print("<td>" + rs.getInt("SumOfhours") + "</td>\n");
                out.print("</tr>\n");
            out.print("</table>\n");
            rs.close();
            stmt.close();
            conn.close();
        catch (Exception e)
            throw new JspException(e.getMessage());
        return SKIP_BODY;
}Finally, projectdetail.jsp, where the tag is called:
<%@page contentType="text/html"%>
<%@page pageEncoding="UTF-8"%>
<%@page import="java.sql.*" %>
<%@page import="java.lang.Integer" %>
<%@taglib uri="/WEB-INF/report.tld" prefix="report" %>
<html>
<head><title>Project Detail</title></head>
<body>
<h1 align="center">Project Status</h1>
<h3>Project Description</h3>
<report:showProjectInfo />
<h3>Team Members</h3>
<report:showProjectTeam />
</body>
</html>The first tag, <report:showProjectInfo />, works fine. However, I get no output whatsoever when the system encounters <report:showProjectTeam />. I am a relative newbie at this, so any help is appreciated.
Jason

It doesnt seem to matter if the code is in doStartTag(), doEndTag(), orr any of the other functions.
I also put, as the first item in the function:
System.out.println("TEST");Nothing.
Just as an aside, here is the code for the <prefix:showProjectInfo />. Maybe I made a mistake in it? I closed the resultset and connection...
import java.io.*;
import java.sql.*;
import java.lang.Integer;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.jsp.*;
import javax.servlet.jsp.tagext.*;
* @author jason.ferguson
public class showProjectInfoTag extends BodyTagSupport
    public int doEndTag() throws JspException
        HttpServletRequest req = (HttpServletRequest) pageContext.getRequest();
        int pr_id = Integer.parseInt(req.getParameter("pr_id"));
        JspWriter out = pageContext.getOut();
        Connection conn = null;
        Statement stmt = null;
        ResultSet rs = null;
        try
           Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
            conn = DriverManager.getConnection("jdbc:odbc:Metrics");
        catch (Exception e)
            throw new JspException(e.getMessage());
        String queryProjectInfo = "SELECT * FROM tblPMProjects WHERE pr_id=" + pr_id;
        try
            stmt = conn.createStatement();
            rs = stmt.executeQuery(queryProjectInfo);
            while (rs.next())
                out.print("<table border=\"1\" style=\"border-collapse:collapse\">\n");
                out.print("<tr>\n");
                out.print("<td><b>Project Name:</b>" + rs.getString("Project_name") + "</td>\n");
                out.print("<td align=\"right\"><b>RAD Number:</b>" + rs.getString("tblProjectNumber") + "</td>\n");
                out.print("</tr>\n");
                out.print("<tr>\n");
                out.print("<td>Project description: " + rs.getString("Project_description") + "</td>\n");
                out.print("</tr>\n");
                out.print("<tr>\n");
                out.print("<td>Customer: " + rs.getString("Customer_POC") + "</td>");
                out.print("<tr>\n");
                out.print("<tr>\n");
                out.print("<td>Customer Unit: " + rs.getString("Customer_OFC") + "</td>\n");
                out.print("</tr>\n");
                out.print("<tr>\n");
                out.print("<td>Customer Phone: " + rs.getString("Customer_phone") + "</td>\n");
                out.print("</tr>\n");
                out.print("</table>\n");
                rs.close();
                stmt.close();
                conn.close();
        catch (Exception e)
            throw new JspException(e.getMessage());
        finally
            //conn.close();
        return SKIP_BODY;

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;
* <p>JSP tag connection, used to get a
* java.sql.Connection object.</p>
* <p>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;
* <p>JSP tag closeconnection, used to close the
* specified java.sql.Connection.<p>
* <p>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

Is possible to write a custom tag inside another custom tag ??

Hi
I�m trying to reduce the time needed to code mi app presentation layer, it uses some custom tags with certain configuration, i would like to know if its possible to do something like this inside my custom tag doAfterBody().
public int doAfterBody() throws JspException {
          JspWriter writer=bodyContent.getEnclosingWriter();
          try {
               writer.print("<customTag:myAnotherTag someEspecificConfigurationParams="someEspecificValues"/>");
          } catch (IOException e) {
               pageContext.getServletContext().log("Error: "+e.getMessage());
          }return SKIP_BODY;
     }The goal is to simplify the jsp code because the configuration params for the custom tags (css styles and similar) are allways the same.
That don�t work, it simply prints <customTag:myAnotherTag/> in screen but the tag is not evaluated, i�ve tried too something like
public int doAfterBody() throws JspException {
          if (repeat) {
               JspWriter writer = bodyContent.getEnclosingWriter();
               try {
                    writer.print("<customTag:myAnotherTag/>");
               } catch (IOException e) {
                    pageContext.getServletContext().log("Error: " + e.getMessage());
               repeat = false;
               return EVAL_BODY_AGAIN;
          return SKIP_BODY;
     }And it doesn�t worked worked. Maybe using the taghandler classes and calls to the doAfterBody could make it work, but when you need to nest tags it could be a little hell of coupling calls, so before doing it i would like to know if what i want is possible. After reading some books i tought it could work because the stack of out objects, but i can�t make it work.
Another idea is to inherit from tagHandler and override some properties in the tags, but i don�t like the idea to much.
So, can anyone help me??
Thanks.

You cannot do that and I have listed out the reason and a possible solution in this post http://forum.java.sun.com/thread.jspa?threadID=697243 from yesterday.
cheers,
ram.

How To create a custom tag in jsf

I'm trying to create a custom tag in jsf.what should be the approach to create it.it would be better if somebody will explain me from the skretch.

There's a decent tutorial here, Priyo:
http://www.exadel.com/tutorial/jsf/HowToWriteYourOwnJSFComponents.pdf
Hope it helps,
Illu

Error in running custom tag

Hi
I am new in jsp?s custom tag development and trying to run it's example with jakarta-tomcat-4.1.30. I have hello.jsp
<%@ taglib uri="/WEB-INF/mytaglib.tld" prefix="first" %>
<HTML>
<HEAD> <TITLE>hELLO tAG</TITLE></HEAD>
<BODY bgcolor="#ffffcc"><B>My first tag prints</B>
<first:hello/></HTML>
and mytaglib.tld as
<?xml version="1.0" encoding="ISO-8859-1" ?>
<!DOCTYPE taglib PUBLIC "-//Sun MicroSystems, Inc.//DTD JSP Tag Library 1.1//EN" "http://java.sun.com/j2ee/dtds/web-jsptaglibrary_1_1.dtd">
<taglib>
<tlibversion>1.0</tlibversion>
<jspversion>1.2</jspversion>
<shortname></shortname>
<uri></uri>
<info>A simple tag library for the example</info>
<tag>
<name>hello</name>
<tagclass>HelloTag</tagclass>
<bodycontent>empty</bodycontent>
<info></info>
</tag>
</taglib>
and HelloTag.java as
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.PageContext;
import javax.servlet.jsp.tagext.Tag;
public class HelloTag implements Tag {
     private PageContext pageContext;
     private Tag parent;
     public HelloTag() {
          super();     }
     public void setPageContext(PageContext arg0) {
          this.pageContext = arg0;}
     public void setParent(Tag arg0) {
          this.parent = arg0;}
     public Tag getParent() {
          return parent;}
     public int doStartTag() throws JspException {
          try{
               pageContext.getOut().print("This is my first Tag");
          }catch(Exception e){throw new JspException("Error);}
          return SKIP_PAGE;     }
     public int doEndTag() throws JspException {
          return SKIP_PAGE;}
     public void release() {     }
I am getting following error
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: /hello.jsp(7,0) Unable to load class hello
     at org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:94)
     at org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:428)
     at org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:219)
     at org.apache.jasper.compiler.Parser.parseCustomTag(Parser.java:712)
     at org.apache.jasper.compiler.Parser.parseElements(Parser.java:804)
     at org.apache.jasper.compiler.Parser.parse(Parser.java:122)
     at org.apache.jasper.compiler.ParserController.parse(ParserController.java:199)
     at org.apache.jasper.compiler.ParserController.parse(ParserController.java:153)
     at org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:227)
     at org.apache.jasper.compiler.Compiler.compile(Compiler.java:369)
     at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:473)
     at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:190)
     at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:295)
     at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
Can anyone help me in running this example.

an uri is not an url,
in your web.xml you should have something like
<taglib>
<taglib-uri>http://yourtaglib/taglib</taglib-uri>
<taglib-location>/WEB-INF/yourtaglibtld</taglib-location>
</taglib>
that uri should be same as in the tld.file and same as in the <%@ taglib tag

Query reg adding custom tags in SOAP Header - AXIS Receiver Adapter

Hi All,
I need to send custom tags as mentioned below to my traget webservice application. I think I can do this with Receiver AXIS adapter but not sure how it can be done. Can any of you suggest?
                                              <WSContext>
               <FromAppId>ABC</FromAppId>
               <ToAppId>XYZ</ToAppId>
          </WSContext>
Thanks,

If you want to add custom tags in the soap header, one possible solution is use XSLT mapping or Java mapping to create header first then do message mapping for mapping the payload structure between your source and target as usual.
So in operation mapping you sequence mapping like this... first XSLT mapping for custom tags for the SOAP Header followed by payload mapping.
Hope that helps.
Search SDN for XSLT Mapping for soap header. Already we have handled these issues.

HTTP 500 Internel server error in Custom tag program on Weblogic 8.1

Dear sir,
Please attend my problem...
I face the Error 500 Internel server error when I rum the custom tag program on weblogic 8.1.
My program Structure is:
Program>Home.jsp
>WEB-INF>classes>mypack>MyTag.java, MyTag.class
>tlds>taglib.tld
>web.xml
Home.jsp:
<%@ taglib uri="/WEB-INF/tlds/taglib" prefix="Kumar" %>
<Kumar:hello name="Vijay">
It is a Tag Body<br>
</neeraj:hello>
taglib.tld:
<taglib>
<tlib-version>1.0</tlib-version>
<jsp-version>1.2</jsp-version>
<uri>/WEB-INF/tlds/taglib</uri>
<tag>
<name>hello</name>
<tag-class>mypack.MyTag</tag-class>
<attribute>
<name>name</name>
<required>true</required>
</attribute>
</tag>
</taglib>
MyTag.java:
package mypack;
import javax.servlet.jsp.*;
import javax.servlet.jsp.tagext.*;
public class MyTag extends TagSupport
String name;
public void setName(String c)
name=c;
public int doStartTag()
return EVAL_BODY_INCLUDE;
public int doEndTag()
try
JspWriter out=pageContext.getOut();
out.print("Good Night "+name);
catch(Exception e)
return EVAL_PAGE;
web.xml:
<web-app>
<welcome-file-list>
<welcome-file>/Home.jsp</welcome-file>
</welcome-file-list>
<taglib>
<taglib-uri>/WEB-INF/tlds/taglib</taglib-uri>
<taglib-location>/WEB-INF/tlds/taglib.tld</taglib-location>
</taglib>
</web-app>
Allthough this program are run on NetBean6.1.In NetBean6.1, i am not specify the web.xml file.Please Help me..

With an [HTTP status code|http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html] of 500, the most helpful information for debugging the problem is usually in the server's log file. There should be a stack trace in the web or application server's log file that will contain the specific root cause of this. It is often a NullPointerException or ClassNotFoundException or other "common" exception.

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