Jstl

[prakashkadakol]

how JSTL can be configured with eclipse i tried out with jst and standar jar files by adding into tomcat but its not working,please let me know any changes i need to make in web.xml

[r035198x]

You don't need any changes in the web.xml.
If your container doesn't have it already then add jstl.jar to your Web-Inf/lib. Otherwise don't add it at all.

[FON]

I guess there are few different approaches, here's mine:

1. create DIR called 'jstl' in your ../WEB-INF/lib/
and copy needed JSTL jars in it:

MyWebProject/WebContent/WEB-INF/lib/jstl/jstl.jar
MyWebProject/WebContent/WEB-INF/lib/jstl/standard.jar

2.To add this jars to classpath:

right click on your Dynamic Web Project 'MyWebProject' and choose

Properties => Java Build path => tab Libraries =>
button Add JARs => in Jar selection choose jars you just copied jstl.jar and standard.jar

(You will probably need to check
properties => Java EE Module Dependencies => JAR/module)

2. copy your *.tld files in

MyWebProject/WebContent/WEB-INF/tags/templates

3. each JSP page that will use JSTL should have this:

<%@ taglib uri="/WEB-INF/tags/templates/c.tld" prefix="c" %>

This way there is not need to add <taglib> in web.xml

hope this will help,
please share you final solution to the rest of forum

good luck!

[prakashkadakol]

Hi
i tried out by your suggestion FON but its not working any alternative way??????? am using eclipse+tomcat 6+jdk1.5+jakarta-taglibs-standard-1.1.2
i have 2 webcontent folder one is under ROOT directory and another is mineproj/webcontent i tried out in both places but getting this error on tomcat console
SEVERE: Servlet.service() for servlet jsp threw exception
java.lang.NoClassDefFoundError: javax/servlet/jsp/tagext/TagLibraryValidator

[FON]

Is everything OK with your servlet-api.jar versions?

Are you using same servlet-api.jar in Tomcat and in Eclipse during
writingt your code?

If it is, go to any of your servlets and place this code

javax.servlet.jsp.tagext.TagLibraryValidator t = new TagLibraryValidator() {
		};

and you should not have any
java.lang.NoClassDefFoundError problems

[prakashkadakol]

mine servlet and jsp programmes are working fine under eclipse
i tried this code javax.servlet.jsp.tagext.TagLibraryValidator t = new TagLibraryValidator() {
};

in servlets but this throws an error java.lang.Error: Unresolved compilation problems:
javax.servlet.jsp.tagext cannot be resolved to a type
The type new TypeValidator(){} must implement the inherited abstract method TypeValidator.getActualValue(String, ValidationContext)
The type new TypeValidator(){} must implement the inherited abstract method TypeValidator.getAllowedFacets()

DB.Testamma.doGet(Testamma.java:25)
javax.servlet.http.HttpServlet.service(HttpServlet .java:617)
javax.servlet.http.HttpServlet.service(HttpServlet .java:717)

[FON]

Once again - it's servlet-api.jar problem!

If you use serlvet-api.jar from your Tomcat 6
it DOES NOT contain package : javax.servlet.jsp.tagext.

There are many other *.jars that has servlet in it's name
and contain package javax.servlet.jsp.tagext.

Go to
JAR Search - findJAR.com

type in search field name of package and class you need:
javax.servlet.jsp.tagext.TagLibraryValidator

and find one that will do your work (like servletapi-2.3.jar ).

I'm not very familiar with servlet specification (2.2, 2.3 ...3.0)
and how Tomcat implements it in his servlet-api.jar
looks like Tomcat 6.x implements servlet 2.5 spec and those
tags that you need are not part of it - they are extensions of some kind.

There is a catch - it can be tricky to use different servlet kinda jars
because Tomcat may cause problems so be patient,
this is not just
take another *.jar and place in on your classpath situation.

go tiger ! you can make this work !

[prakashkadakol]

HI
i added jervletapi.jar which u have mentioned now below code is in servlet
javax.servlet.jsp.tagext.TagLibraryValidator t = new TagLibraryValidator() {
};
but mine jsp code ie shown below even mine simple jsp pages also throws error i think now conflict between existing servletapi.jar and new added servlet-api2.3.jar
<%@ taglib uri="/WEB-INF/tags/templates/c.tld" prefix="c" %>
<html>
<head>
<title>Count to 10 Example (using JSTL)</title>
</head>

<body>
<c:forEach var="i" begin="1" end="10" step="1">
<c:out value="${i}" />

<br />
</c:forEach>
</body>
</html>


still throwing below error on console
SEVERE: Servlet.service() for servlet jsp threw exception
java.lang.NoSuchMethodError: javax.servlet.jsp.tagext.TagAttributeInfo.<init>(L java/lang/String;ZLjava/lang/String;ZZLjava/lang/String;ZZLjava/lang/String;Ljava/lang/String;)V
at org.apache.jasper.compiler.TagLibraryInfoImpl.crea teAttribute(TagLibraryInfoImpl.java:584)
at org.apache.jasper.compiler.TagLibraryInfoImpl.crea teTagInfo(TagLibraryInfoImpl.java:397)
at org.apache.jasper.compiler.TagLibraryInfoImpl.pars eTLD(TagLibraryInfoImpl.java:250)
at org.apache.jasper.compiler.TagLibraryInfoImpl.<ini t>(TagLibraryInfoImpl.java:163)
at org.apache.jasper.compiler.Parser.parseTaglibDirec tive(Parser.java:431)
at org.apache.jasper.compiler.Parser.parseDirective(P arser.java:494)
at org.apache.jasper.compiler.Parser.parseElements(Pa rser.java:1444)
at org.apache.jasper.compiler.Parser.parse(Parser.jav a:138)

[FON]

I got it ! :)

My Tomcat 6 in lib folder contains this jar:

C:\apache-tomcat-6.0.20\lib\jsp-api.jar

Inside of it is package:
javax.servlet.jsp.tagext

Maybe this jar must use some other jars that are in same lib folder
so check out your Tomcat!

Remove all new servlet jars that make a conflict,
and try with this

[prakashkadakol]

hi

i have made changes but nothing has been changed in error

[FON]

Have we or have we not resolve first error you posted:

"SEVERE: Servlet.service() for servlet jsp threw exception
java.lang.NoClassDefFoundError: javax/servlet/jsp/tagext/TagLibraryValidator"

Now that we know that jsp-api.jar contains that class
this should be resolved?

After you answer question above
please post your exact error again so we can continue ;)