Class not found..

[Nischal Tanna]

Hi..
I am using Tomcat 4.1.. I am using taglibs..I have kept my files as described below..
Tag handler class in /web-inf/classes/
tld file in /web-inf/
and jsp in /jsp/
I am getting an error describing that the class cannot be resolved i.e.,cannot resolve symbol for the class name..I guess its not able to load the class..
So whats the probs...?
Hoping for a positive reply..

[Amit KumarS]

hiiii..
which classes are u talking about??? please give more info.. have u given the path of the tld files in the web.xml file like below..

  <taglib>
    <taglib-uri>/WEB-INF/tiles.tld</taglib-uri>
    <taglib-location>/WEB-INF/tld/tiles.tld</taglib-location>
  </taglib>

please specify abt error in more detail... paste the excat error if possible..
Thanx
Amit

[Nischal Tanna]

I have not given the taglib description in web.xml but have directly used the taglib as
<%@ taglib uri="/WEB-INF/taglib.tld" prefix="mytag" %>

[Amit KumarS]

i think u need to mention that in that web.xml..
'cause when in JSP u say taglib uri ="xyz.tld" then it goes and looks inside the web.xml and picks the <taglib-location> from there and loads that tld file... and works accordingly..
try this out and tell me if it works..
Thanks
Amit

[Nischal Tanna]

The error stack trace is:

  
org.apache.jasper.JasperException: /jsp/usingtag.jsp(5,0) Unable to load class nischal
at org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:94)
at org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:417)
at org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:219)
at org.apache.jasper.compiler.Parser.parseCustomTag(Parser.java:717)
at org.apache.jasper.compiler.Parser.parseElements(Parser.java:808)
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:219)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:323)
at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:474)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:184)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:289)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:240)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:260)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2396)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:170)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:172)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:223)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:405)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:380)
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:508)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:533)
at java.lang.Thread.run(Thread.java:484)

[Amit KumarS]

hi
is this stack trace even after adding that taglib code in ur web.xml or before...
and can u paste me the code of usingtag.jsp.. atleast the first 10 lines..
then i might be able to deduce better..
Thanks
Amit

[Nischal Tanna]

Its a simple jsp file..n even after adding the taglib element in web.xml i m getting the same error as unable to load class nischal..That means its getting the tld file..but i guess theres some probs with the class file..i mean not getting the class file but the class file is placed in the classes

 
<%@taglib uri="tag" prefix="mytag" %>
<html>
<body>
<b>The following is the usage of the custom tag called "nischal"</b>
<hr>
<mytag:nischal/>
</body>
</html>
 

  
<taglib>
<tlibversion>1.0</tlibversion>
<jspversion>1.1</jspversion>
<shortname>mytag</shortname>
<info>
This is a TagLib created by Nischal Tanna
</info>
<!--Information about various tags follow-->
<!--First tag(nischal) without parameter-->
<tag> 
<name>nischal</name>
<tagclass>helloworldtag</tagclass>
<bodycontent>empty</bodycontent>
<info>A Simple Tag Without any Body or Parameter</info>
</tag>
</taglib>

[Amit KumarS]

hey..
the error seems to be pretty harmless
in the <tag>
there is <tagclass>, it should be <tag-class>

<tag> <name>nischal</name>[B]<tagclass>helloworldtag</tagclass>[/B]<bodycontent>empty</bodycontent><info>A Simple Tag Without any Body or Parameter</info></tag>

it should be

<tag> <name>nischal</name>[B]<tag-class>[\B] helloworldtag [B]</tag-class>[\B]<bodycontent>empty</bodycontent><info>A Simple Tag Without any Body or Parameter</info></tag>

check this out ans tell me if it works...
Thanks
Amit

[Nischal Tanna]

It is giving an error in xml file..I mean not allowing tag-class..only allows tagclass..

[Amit KumarS]

which dtd are you using??
i use the following dtd..
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE taglib
PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.2//EN"
"http://java.sun.com/j2ee/dtds/web-jsptaglibrary_1_2.dtd">
with this tag-class is used..
but if you are using following older version then foloowing is used
<?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">

have u mentioned you tag handler class in some package or what?? if it is so then u need to mention that too in your taglib descriptor
i am giving you a sample code... might be of some help

<?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/j2ee/dtd/web-jsptaglibrary_1_2.dtd">
<taglib>
  <tlib-version>1.0</tlib-version>
  <jsp-version>1.2</jsp-version>
  <short-name>simple</short-name>
  <uri>http://jakarta.apache.org/tomcat/example-taglib</uri>
  <description>
A simple tab library for the examples
  </description>
  <tag>
    <name>ShowSource</name>
    <tag-class>examples.ShowSource</tag-class>
    <description> Display JSP sources </description>
    <attribute>
       <name>jspFile</name>
       <required>true</required>
       <rtexprvalue>true</rtexprvalue>
    </attribute>
  </tag>       
  <!-- A simple Tag -->
  <!-- foo tag -->
  <tag>
    <name>foo</name>
    <tag-class>examples.FooTag</tag-class>
    <tei-class>examples.FooTagExtraInfo</tei-class>
    <body-content>JSP</body-content>
    <description>
Perform a server side action; uses 3 mandatory attributes
    </description>
    <attribute>
      <name>att1</name>
      <required>true</required>
    </attribute>
    <attribute>
      <name>att2</name>
      <required>true</required>
    </attribute>
    <attribute>
      <name>att3</name>
      <required>true</required>
    </attribute>
  </tag>
  <!-- Another simple tag -->
  <!-- log tag -->
  <tag>
    <name>log</name>
    <tag-class>examples.LogTag</tag-class>
    <body-content>TAGDEPENDENT</body-content>
    <description>
Perform a server side action; Log the message.
    </description>
    <attribute>
<name>toBrowser</name>
<required>false</required>
    </attribute>
  </tag>
  
</taglib>

tell me if this is of some help....
Thanks
Amit