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Java Forum / General / May 2006

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Tomcat 5.5 - custom tag problem

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Piet71 - 13 May 2006 20:44 GMT
Hello,
I have recently started to learn JSP and servlets and have installed
Tomcat5.5 as servlet engine. At the moment, I am struggling with the
correct use of taglibs. After trying to write my own simple JSPs
without success, I switched to a sample webapp from a book CD but that
isn´t working either. Here is a description of the webapp:
Folder "custom" below the tomcat "webapps" folder contains the file
custom.jsp with the following content:
   <%@ taglib uri="/WEB-INF/tld/tags.tld" prefix="jct" %>
   <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
   <html>
   <head>
   <meta http-equiv="Content-Type"
content="text/html;charset=iso-8859-1">
   </head>
   <body>
   <jct:ausgabe />
   </body>
   </html>
The "custom" folder has a subfolder "WEB-INF" with the following
web.xml:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE web-app PUBLIC '-//Sun Microsystems, Inc.//DTD Web
Application 2.2//EN' 'http://java.sun.com/j2ee/dtds/web-app_2.2.dtd'>
<web-app>
 <taglib>
       <taglib-uri>
      http://www.xmlguru.de/jct
       </taglib-uri>
       <taglib-location>
          /WEB-INF/tld/tags.tld
       </taglib-location>
   </taglib>
</web-app>
Below "WEB-INF", there is a folder "tld" with the following file
"tags.tld":
<?xml version="1.0" ?>
<!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>jct</short-name>
  <uri>http://www.xmlguru.de/jct</uri>
  <description>
     Mein erstes selbstdefiniertes Tag
  </description>
  <tag>
     <name>ausgabe</name>
     <tag-class>meineTags.AusgabeText</tag-class>
  </tag>
</taglib>
Finally, the "WEB-INF" contains a folder "classes" with the following
"AusgabeText.java":
package meineTags;
import javax.servlet.jsp.*;
import javax.servlet.jsp.tagext.*;
import java.io.*;

public class AusgabeText extends TagSupport
{
   public int doStartTag()
   {
    try
    {
       JspWriter out = pageContext.getOut();
       out.println("Dies ist mein erstes JSP-Tag");
    }
    catch (IOException iex)
    {
       System.out.println(iex.toString());
    }
    return SKIP_BODY;
   }

   public int doEndTag()
   {
    return EVAL_PAGE;
   }
}
When I compile this file, I can see the class file being generated in
the "meineTags" folder.
When I invoke the JSP, I get the following error page in my browser:
type Exception report

message

description The server encountered an internal error () that prevented
it from fulfilling this request.

exception

javax.servlet.ServletException:
javax.servlet.jsp.tagext.TagInfo.<init>(Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljavax/servlet/jsp/tagext/TagLibraryInfo;Ljavax/servlet/jsp/tagext/TagExtraInfo;[Ljavax/servlet/jsp/tagext/TagAttributeInfo;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;[Ljavax/servlet/jsp/tagext/TagVariableInfo;Z)V
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:272)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:853)

root cause

java.lang.NoSuchMethodError:
javax.servlet.jsp.tagext.TagInfo.<init>(Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljavax/servlet/jsp/tagext/TagLibraryInfo;Ljavax/servlet/jsp/tagext/TagExtraInfo;[Ljavax/servlet/jsp/tagext/TagAttributeInfo;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;[Ljavax/servlet/jsp/tagext/TagVariableInfo;Z)V
    org.apache.jasper.compiler.TagLibraryInfoImpl.createTagInfo(TagLibraryInfoImpl.java:435)
    org.apache.jasper.compiler.TagLibraryInfoImpl.parseTLD(TagLibraryInfoImpl.java:248)
    org.apache.jasper.compiler.TagLibraryInfoImpl.<init>(TagLibraryInfoImpl.java:162)
    org.apache.jasper.compiler.Parser.parseTaglibDirective(Parser.java:423)
    org.apache.jasper.compiler.Parser.parseDirective(Parser.java:492)
    org.apache.jasper.compiler.Parser.parseElements(Parser.java:1552)
    org.apache.jasper.compiler.Parser.parse(Parser.java:126)
    org.apache.jasper.compiler.ParserController.doParse(ParserController.java:211)
    org.apache.jasper.compiler.ParserController.parse(ParserController.java:100)
    org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:146)
    org.apache.jasper.compiler.Compiler.compile(Compiler.java:286)
    org.apache.jasper.compiler.Compiler.compile(Compiler.java:267)
    org.apache.jasper.compiler.Compiler.compile(Compiler.java:255)
    org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:563)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:293)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:853)

note The full stack trace of the root cause is available in the Apache
Tomcat/5.5.12 logs.

The last entry in the error.log is the following:

13.05.2006 21:41:11 org.apache.catalina.core.StandardWrapperValve
invoke
SCHWERWIEGEND: Servlet.service() for servlet jsp threw exception
java.lang.NoSuchMethodError:
javax.servlet.jsp.tagext.TagInfo.<init>(Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljavax/servlet/jsp/tagext/TagLibraryInfo;Ljavax/servlet/jsp/tagext/TagExtraInfo;[Ljavax/servlet/jsp/tagext/TagAttributeInfo;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;[Ljavax/servlet/jsp/tagext/TagVariableInfo;Z)V
    at
org.apache.jasper.compiler.TagLibraryInfoImpl.createTagInfo(TagLibraryInfoImpl.java:435)
    at
org.apache.jasper.compiler.TagLibraryInfoImpl.parseTLD(TagLibraryInfoImpl.java:248)
    at
org.apache.jasper.compiler.TagLibraryInfoImpl.<init>(TagLibraryInfoImpl.java:162)
    at
org.apache.jasper.compiler.Parser.parseTaglibDirective(Parser.java:423)
    at org.apache.jasper.compiler.Parser.parseDirective(Parser.java:492)
    at org.apache.jasper.compiler.Parser.parseElements(Parser.java:1552)
    at org.apache.jasper.compiler.Parser.parse(Parser.java:126)
    at
org.apache.jasper.compiler.ParserController.doParse(ParserController.java:211)
    at
org.apache.jasper.compiler.ParserController.parse(ParserController.java:100)
    at org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:146)
    at org.apache.jasper.compiler.Compiler.compile(Compiler.java:286)
    at org.apache.jasper.compiler.Compiler.compile(Compiler.java:267)
    at org.apache.jasper.compiler.Compiler.compile(Compiler.java:255)
    at
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:563)
    at
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:293)
    at
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
    at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
    at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
    at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
    at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
    at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
    at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
    at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
    at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
    at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:868)
    at
org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:663)
    at
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
    at
org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
    at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
    at java.lang.Thread.run(Thread.java:534)

The  book that I have used dates from 2003 and contains only tomcat 5.
Are some of the files erronous or has the handling og taglibs changed
in tomcat 5.5?
Many thanks for your hints
Best regards

Peter
Reply to this Message
Wretched Excess - 14 May 2006 01:14 GMT
Is there a Context for your application ("custom") in your server.xml...?
If so, did you restart Tomcat after adding it...?
Reply to this Message
Piet71 - 14 May 2006 10:44 GMT
Wretched Excess schrieb:

> Is there a Context for your application ("custom") in your server.xml...?
No. Such a modification was not mentioned in the book that I used. It
should be sufficient to provide a suitable web.xml file and the other
resources in the subfolder of the web-app directory.
> If so, did you restart Tomcat after adding it...?
It turned out that I didn´t use the correct or sufficient *.jar files
for compilation. I don´t remember where I got the servlet.jar file in
the lib\ext folder of my jdk installation. After I copied the files
jsp-api.jar and servlet-api.jar from the common\lib folder of my tomcat
installation to the lib\ext folder of the dsk, everything worked. For
some reason, my IDE doesn´t find the jar files when they reside in
common\lib folder, but that´s only a minor issue.
Thanks for your reply
Piet
Reply to this Message


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