JSP custom taglib

Hi, I've a big problem:
I tried to realize my first custom taglib for converting a .jasper file (a precompilated formatted meta-document) into a PDF file but I poorly failed... :(
Unfortunatly, although the code run correctly into a main class into a stand alone sample application, the same code (opportunely adapted) doesen't work correctly if used by a JSP with its relative custom tag library.
The error message is:
javax.servlet.ServletException: Error loading expression class : report_semplice
 org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:872)
 org.apache.jasper.runtime.PageContextImpl.access$1100(PageContextImpl.java:114)
 org.apache.jasper.runtime.PageContextImpl$12.run(PageContextImpl.java:792)
 java.security.AccessController.doPrivileged(Native Method)
 org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:790)
 org.apache.jsp.reportPDF_jsp._jspService(reportPDF_jsp.java:82)
 org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:141)
 javax.servlet.http.HttpServlet.service(HttpServlet.java:861)
 org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:325)
 org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:306)
 org.apache.jasper.servlet.JspServlet.service(JspServlet.java:253)
 javax.servlet.http.HttpServlet.service(HttpServlet.java:861)
 sun.reflect.GeneratedMethodAccessor178.invoke(Unknown Source)
 sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 java.lang.reflect.Method.invoke(Method.java:324)
 org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:289)
 java.security.AccessController.doPrivileged(Native Method)
 javax.security.auth.Subject.doAsPrivileged(Subject.java:500)
 org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:311)
 org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:205)
root cause
javax.servlet.jsp.JspTagException: Error loading expression class : report_semplice
 com.tag.GeneratePDF.doEndTag(GeneratePDF.java:72)
 org.apache.jsp.reportPDF_jsp._jspx_meth_JR_GeneratePDF_0(reportPDF_jsp.java:99)
 org.apache.jsp.reportPDF_jsp._jspService(reportPDF_jsp.java:71)
 org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:141)
 javax.servlet.http.HttpServlet.service(HttpServlet.java:861)
 org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:325)
 org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:306)
 org.apache.jasper.servlet.JspServlet.service(JspServlet.java:253)
 javax.servlet.http.HttpServlet.service(HttpServlet.java:861)
 sun.reflect.GeneratedMethodAccessor178.invoke(Unknown Source)
 sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 java.lang.reflect.Method.invoke(Method.java:324)
 org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:289)
 java.security.AccessController.doPrivileged(Native Method)
 javax.security.auth.Subject.doAsPrivileged(Subject.java:500)
 org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:311)
 org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:205)
The code of the taglib class is:
package com.tag;
import javax.servlet.jsp.*;
import javax.servlet.jsp.tagext.*;
import net.sf.jasperreports.engine.*;
import net.sf.jasperreports.engine.export.*;
import net.sf.jasperreports.engine.util.*;
import net.sf.jasperreports.view.*;
import java.sql.*;
import org.apache.commons.logging.*;
import java.io.*;
import java.util.*;
public class GeneratePDF extends TagSupport
private String sourceFileName = "C:\\default.jasper";
private String destinationFileName = "C:\\default.pdf";
public void setSourceFileName(String sourceFileName)
 this.sourceFileName = sourceFileName;
public void setDestinationFileName(String destinationFileName)
 this.destinationFileName = destinationFileName;
public int doStartTag()
 return SKIP_BODY;
public int doEndTag() throws JspTagException
 try
 //Passaggio parametri da passare al jasper.
 Map parameters = new HashMap();
 parameters.put("param1", new Integer(1));
 //Preparazione del file da stampare (in questa fase si esegue la query e si inseriscono
 //i valori estratti dalla query)
 JasperPrint jasperPrint=JasperFillManager.fillReport(sourceFileName, parameters, getConnection());
 // a schermo
 // JasperViewer.viewReport(jasperPrint);
 // test
 //pageContext.getOut().println("Destination File:" + destinationFileName);
 //Creazione del PDF
 JasperExportManager.exportReportToPdfFile(jasperPrint, destinationFileName);
 // System.exit(0);
 catch(Exception e)
 { throw new JspTagException(e.getMessage());
 return EVAL_PAGE;
/**Metodo per creare la connessione al DB*/
private static Connection getConnection() throws ClassNotFoundException, SQLException {
//Change these settings according to your local configuration
String driver = "sun.jdbc.odbc.JdbcOdbcDriver";
String connectString = "jdbc:odbc:gecoware";
String user = "admin";
String password = "password";
Class.forName(driver);
Connection conn = DriverManager.getConnection(connectString, user, password);
return conn;
The .TLD file is:
<?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>1.1</jspversion>
 <shortname>JR</shortname>
 <uri>ReportTags</uri>
 <info>Tag library per la generazione di report a partire da files .jasper</info>
 <tag>
 <name>GeneratePDF</name>
 <tagclass>com.tag.GeneratePDF</tagclass>
 <bodycontent>empty</bodycontent>
 <info>Tag per la generazione di PDF</info>
 <attribute>
 <name>sourceFileName</name>
 </attribute>
 <attribute>
 <name>destinationFileName</name>
 </attribute>
 </tag>
</taglib>
And the JSP code is:
<%@ page contentType="text/html; charset=iso-8859-1" language="java" import="java.sql.*" errorPage="" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%@ taglib uri="ReportTags" prefix="JR" %>
<html>
<head>
<title>GeneratePDF</title>
</head>
<body>
<JR:GeneratePDF sourceFileName="c:\\report_semplice.jasper" destinationFileName="c:\\report1.pdf"/>
</body>
</html>
I hope that someone could help me...
Thank you,
AleX

Hi,
 I think that the container can not identify the tag's ,what you are trying to use.
 As per the j2ee specification , we need to follow the procedure to use the taglib as given below
 Procedure for using a Tag Lib :
 â€¢ Copy tag lib jar files under WEB-INF/lib ( if tag handler supplied as classes without package a jar file then we need to copy the classes under WEB_INF/classes.
 â€¢ Copy the tld files files under WEB-INF or create a directory under WEB-INF and copy tld files under this directory.
 â€¢ We need to give the information about the tag libraries in web.xml by adding the following lines to it as,
 <taglib>
 <taglib-uri>http://www.inet.com/taglibs/bodytags</taglib-uri>
 <taglib-location>/WEB-INF/tlib/tlib1.tld </taglib-location>
 </taglib>
 To use tags in jsp file we need to add taglib directive as ,
 <%@ taglib uri="http://www.inet.com/taglibs/samptags" prefix=â€œabc"%>
 Every tag can support zero or more number of attributes and a tag may or may not support body content.
 weblogic server try to parse the .tld file whenever the tags are encountered in jsp files.
 As per the .tld file the container identify the attributes of the tags which were defined in .tld file.
 ------ Anilkumar kari

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MikeS27
Message was edited by:
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Hi. Show me your pool definition.
Joe
Ramamurthy wrote:
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09:28:01,656 INFO [STDOUT] TestIterator: doInitBody
09:28:01,656 INFO [STDOUT] TestIterator: doAfterBody
09:28:01,656 INFO [STDOUT] TestIterator: doAfterBody
09:28:01,656 INFO [STDOUT] TestIterator: doAfterBody
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Thanks and greetings from germany!
Peter
Message was edited by:
Peter_Goetz

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http://otn.oracle.com/tech/java/oc4j/doc_library/902/jsp/taglibs.htm#1004903
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Tue Sep 09 18:46:56 GMT 2008
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<taglib-uri>/dodo</taglib-uri>
<taglib-location>/WEB-INF/jsp/csajsp.tld</taglib-location>
</taglib>
and I call it in my jsp file in the following way:
<%@ taglib uri="/dodo" prefix="c" %>
And still doesn't work
I'm using jdk 1.4.2 and tomcat 4.1.24.
Any clues, thanks.

That is right. The thing is that the custom tag example from tomcat works, and mine doesn't. Someone told me that it could be a jdk 1.4.2 issue, but thanks anyway.

Run-Time expression evaluation does not work with custom TagLib

 Hi,
 Using "WebLogic EJB to JSP Integration Tool", we have created a custom TagLib.
 We can properly deploy/start our Web application (a WAR file), but whenever we
 go to the JSP page that is using the custom Tag, we get the following exception:
 java.lang.ClassCastException: java.lang.Object
 at javax.servlet.jsp.tagext.TagData.getAttributeString(TagData.java:165)
 Here is what we have in our JSP page:
 <%@ taglib uri="Students-tags" prefix="students" %>
 <%
 String studentID = (String)session.getAttribute("studentID");
 %>
 <students:Register studentID="<%=studentID%>" />
 <%
 And the TLD file looks like this:
 <?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>
 <shortname>ejb2jsp generated tag library</shortname>
 <tag>
 <name>Register</name>
 <tagclass>EJBs.Students.jsp_tags._Students_RegisterTag</tagclass>
 <teiclass>EJBs.Students.jsp_tags._Students_RegisterTagTEI</teiclass>
 <info>
 attribute 'studentID' expects java type 'java.lang.String'
 </info>
 <attribute>
 <name>studentID</name>
 <required>true</required>
 <rtexprvalue>true</rtexprvalue>
 </attribute>
 </tag>
 </taglib>
 and Web.xml file does have the following entry:
 <taglib>
 <taglib-uri>
 Students-tags
 </taglib-uri>
 <taglib-location>
 /WEB-INF/Students-tags.tld
 </taglib-location>
 </taglib>
 Does anybody knows whay Do I get such an exception ?


You might want to ask this in a servlet/jsp interest group.

Q:Custom Taglibs in jDeveloper 9i RC

I'm making a project with jsp's and custom taglibs. I created the taglib with the wizard and it is saved in ..\src\META-INF\xxx.tld. But when I need to it into the JSP it searches for a tld file from the public_html directory.
Should I copy this file manually in the public_html directory ? Or should I change a setup somewhere ? I also did a deployment of the taglib into a .jar file. Is there a way to include and use it directly ?
Thanks !

Hi Mike, thanks for your help, it works.
But now, the problem moved to another point: EL Expressions.
My custom taglib needs to receive BPMObjects attributes (by EL assignment), so:
If i keep the <install_dir>\webapps\workspace\WEB-INF\web.xml file as standard my ${object.attribute} is passed by as a string, not a EL, even if my custom tld accepts EL.
If I change the web.xml above, turning off the <el-ignored> configuration it works
<jsp-config>
 <jsp-property-group>
 <url-pattern>*.jsf</url-pattern>
 <is-xml>false</is-xml>
 </jsp-property-group>
 <jsp-property-group>
 <url-pattern>*.jsp</url-pattern>
 <url-pattern>*.jspf</url-pattern>
 <el-ignored>false</el-ignored>
 </jsp-property-group>
 </jsp-config>but then i get a problem with core jstl "c" using this URI
*<%@ taglib uri="http://java.sun.com/jstl/core" prefix="c"%>*
According to TLD or attribute directive in tag file, attribute value does not accept any expressions
even if a change it URI to
*<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>*
i have
The absolute uri: http://java.sun.com/jsp/jstl/core cannot be resolved in either web.xml or the jar files deployed with this application
So, have you faced this issue before? There is an way to change the core tld file within obpm jars?
thanks again

Import custom taglib??/

I'm a newbee with UIX, sorry if this question seems stupid. How do you go about importing a custom taglib into UIX application?
Thanks!

Hi,
You cannot use jsp tags inside a uix page.
However, you can import the content of another JSP from within a UIX file.
see:
http://otn.oracle.com/jdeveloper/help/topic?inOHW=true&linkHelp=false&file=jar%3Afile%3A/u01/app/oracle/product/IAS904/j2ee/OC4J_ohw/applications/jdeveloper/jdeveloper/helpsets/jdeveloper/uixref.jar!/ui/servletInclude.html

Error in TLD(jsp custom tags)

Hi frinend
iam trying jsp custom tabs (taglibs)
i worte a java class
i worte a jsp page
i worte a TLd file
the proble with tlb
it geting error like this
org.apache.jasper.JasperException: XML parsing error on file /WEB-INF/jsp/mytaglib.tld: (line 2, col -1): XML declaration may only begin entities.
what is that mean
i wrote in tld file like this
<?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>1.1</jspversion>
<shortname>first</shortname>
<uri></uri>
<info>A simple tab library for the
examples</info>
<tag>
<name>hello</name>
<tagclass>tags.HelloTag</tagclass>
<bodycontent>empty</bodycontent>
<info>Say Hi</info>
</tag>
</taglib>
pls help
regards
kedar

try something that looks like this in your tld file:
<?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>1.2</tlib-version>
<jsp-version>1.2</jsp-version>
<short-name>MyFirstTag</short-name>
<tag>
<name>helloparam</name>
<tag-class>tags.HyperTag</tag-class>
<body-content>empty</body-content>
<attribute>
<name>name</name>
<required>false</required>
<rtexprvalue>false</rtexprvalue>
</attribute>
</tag>
</taglib>

JSP custom taglib

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