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Web Component Certification (OCEJWCD)

Tag Files Packaged in JAR files.

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posted 15 years ago

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I have an application "sample"

To test example of TAG files packaged in JAR file, I created /result.jsp

Next I know that TAG file has to be placed in META-INF/tags So I created META-INF folder separately and in META-INF/tags I created

MoreFooter.tag

Next I created META-INF/TLDs, I created metaTag.tld

MANIFEST.MF

Next I created a jar (sample-tld.jar) of this META-INF folder and copied to /sample/WEB-INF/lib.

sample-tld.jar structure

--------tags
----------------MoreFooter.tag
--------TLDs
----------------metaTag.tld
--------MANIFEST.MF

Webapp sample structure

--------result.jsp
--------WEB-INF
----------------lib
------------------------sample-tld.jar
--------META-INF
----------------MANIFEST.MF

Now there are some support servlets which forward my request to this JSP. They are working fine. But when I hit it. This is the output

TRYING TAG FILES
DISPLAYING SOME FOOTER THRU TAG FILES in META-INF. ULTIMATE!!!

But for second line of output I expected it to come out in some color followed by "THIS IS IN META-INF ONCE MORE:"

It seems container is not able to associate "comtags" URI with MoreFooter.tag in the jar.

The only thing I can think of is I might have to put something in the JSP to relate the URI to TAG file.

but

<%@ taglib prefix="comtags" uri="/META-INF/tags" %> doesn't work since it says File "/META-INF/tags" not found

<%@ taglib prefix="comtags" tagdir="/META-INF/tags" %> doesn't work since it says that tagdir should start with /WEB-INF/tags

What am I doing wrong here ???

Kamal Tripathi
SCJP 1.4 90%, SCWCD5 94%, Next SCDJWS--> In Naescent stage. Researching abt exam and material itself.

Christophe Verré

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posted 15 years ago

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sample-tld.jar structure

Where is META-INF ? META-INF and its subdirectories should be in the JAR file.

<uri>comtags</uri>

You should use this uri to access your library :

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Poonam Agarwal

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posted 15 years ago

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uri>comtags</uri>

You should use this uri to access your library :
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<%@ taglib prefix="comtags" uri="comtags" %>

We need to use tagdir while using tagfiles. but as you deploy your tagfiles as a jar within lib folder, you have to use "uri" attribute corresponde to the <uri></uri> element of the TLD file.
Moreover as Cristophe already mentions it. you need to put these files in the META-INF (TLD files AND tag files) folder wirhin simpleTag.jar file. Every .jar has its own META-INF folder inside it.

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Kamal Tripathi

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posted 15 years ago

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I think I didn't put up the sample-tld.jar structure correctly. I missed out on mentioning META-INF. All the contents are inside META-INF. So this is the correct structure.

sample-tld.jar structure

--------META-INF
----------------MANIFEST.MF
----------------tags
------------------------MoreFooter.tag
----------------TLDs
------------------------metaTag.tld

You should use this uri to access your library :

<%@ taglib prefix="comtags" uri="comtags" %>

But I didn't have this line in my jsp. (Didn't know that when tag files are packages in jar files you have to use uri attribute instead of tagidr). So now my jsp reads as

But now I am getting error as

org.apache.jasper.JasperException: File "/comtags" not found
	org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:51)
	org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:409)
	org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:116)
	org.apache.jasper.compiler.TagLibraryInfoImpl.<init>(TagLibraryInfoImpl.java:160)
	org.apache.jasper.compiler.Parser.parseTaglibDirective(Parser.java:424)
	org.apache.jasper.compiler.Parser.parseDirective(Parser.java:493)
	org.apache.jasper.compiler.Parser.parseElements(Parser.java:1557)
	org.apache.jasper.compiler.Parser.parse(Parser.java:127)
	org.apache.jasper.compiler.ParserController.doParse(ParserController.java:212)
	org.apache.jasper.compiler.ParserController.parse(ParserController.java:101)
	org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:156)
	org.apache.jasper.compiler.Compiler.compile(Compiler.java:296)
	org.apache.jasper.compiler.Compiler.compile(Compiler.java:277)
	org.apache.jasper.compiler.Compiler.compile(Compiler.java:265)
	org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:564)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:302)
	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:329)
	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
	mypackage.S1.doGet(S1.java:47)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:803)

I am wondering if I have to declare anything in sample-tld.jar/META-INF/META-INF.MF ???

Kamal Tripathi
SCJP 1.4 90%, SCWCD5 94%, Next SCDJWS--> In Naescent stage. Researching abt exam and material itself.

nisha chidella

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posted 15 years ago

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did you resolve this problem ? am getting the same exception.

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Kamal Tripathi

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posted 15 years ago

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nope I was not able to.

Kamal Tripathi
SCJP 1.4 90%, SCWCD5 94%, Next SCDJWS--> In Naescent stage. Researching abt exam and material itself.

nisha chidella

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Oh ..its working for me now. i just forgot to restart the server after deploying the jar file.

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