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JSTL 3 while migration causing issues

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posted 4 months ago

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I have the following code in a JSP file for the tags which is included in all of my JSP files at the top:

Since I recently migrated from Spring 5.X to Spring 6, I've changed the above to the following as per jakarta specification of 3.0 listed here(https://jakarta.ee/specifications/tags/3.0/jakarta-tags-spec-3.0):

However, I still keep on getting following error while accessing a JSP page.

Here are few relavent things from my pom.xml:

I'm using Tomcat 10.1.45 here to start the above app. Is there anything I'm missing?

Tim Holloway

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posted 4 months ago

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I haven't used Struts since I moved to JSF, but the thing that strikes me is that you're using all those taglib declarations in snippet form.

As a general rule, we've moved on to using XML schemas these days. For example (JSF):

You might want to check the latest Struts docs.

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Jack Tauson

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Tim Holloway wrote:I haven't used Struts since I moved to JSF, but the thing that strikes me is that you're using all those taglib declarations in snippet form.

As a general rule, we've moved on to using XML schemas these days. For example (JSF):
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml" xmlns:h="http://xmlns.jcp.org/jsf/html" xmlns:f="http://xmlns.jcp.org/jsf/core" xmlns:ui="http://java.sun.com/jsf/facelets" xmlns:p="http://primefaces.org/ui" xmlns:c="http://xmlns.jcp.org/jstl" > <head>...
You might want to check the latest Struts docs.

I should have mentioned it but we have stopped using struts in this app but remnants are still there so I didn't bother removing it unless I figure out this issue.

Tim Holloway

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posted 4 months ago

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I'd check to make sure that no Struts tags are being used on that page and then remove them. I'd also check to make sure that no Struts libraries are being included in the build. It looks like Struts is doing something and it thinks you're using the old pre-jakarta JEE.

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Jack Tauson

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Tim Holloway wrote:I'd check to make sure that no Struts tags are being used on that page and then remove them. I'd also check to make sure that no Struts libraries are being included in the build. It looks like Struts is doing something and it thinks you're using the old pre-jakarta JEE.

Yeah, there are lot of Struts tags in use like logic iterate and logic Empty etc so I'm in the process of replacing logic iterate with c:foreach of JSTL , and logic empty with c:if test of JSTL. Probably, I will try to get rid of all of these tags from a page and see if it works. There are also <bean:write/> tags so getting these replaced with <c:out of JSTL. >

I also noticed a comtag.tld file sitting inside WEBINF folder which has the following contents:

any idea what this might be for? Also, what might be the JSTL 3.0 compatible version for this?

Roland Mueller

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Jack Tauson wrote:

I also noticed a comtag.tld file sitting inside WEBINF folder which has the following contents:

<?xml version="1.0" encoding="UTF-8"?> <!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>comtag</shortname> <uri></uri> <tag> <name>recentMultTag</name> <tagclass>com.web.tags.RecentMultTag</tagclass> <bodycontent>empty</bodycontent> </tag> <tag> <name>genericMultTag</name> <tagclass>com.web.tags.GenericsTag</tagclass> <bodycontent>empty</bodycontent> </tag> </taglib>

any idea what this might be for? Also, what might be the JSTL 3.0 compatible version for this?

Makes it a difference to increase tlibversion to 1.1? Otherwise, to my surprise the TLD content should be still ok for Jakarta but it's an awfully long time ago I wrote some taglib POC/playground code.

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Roland Mueller

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Following this URL brings me to Displaytags page at Sourceforge where I can download the freshest version from year 2008.

The project was then move to - hard to guess :-) - Github and latest release 3.0.2 claims to support Jakarta namespaces.

...

Jack Tauson

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Roland Mueller wrote:

Jack Tauson wrote:

I also noticed a comtag.tld file sitting inside WEBINF folder which has the following contents:

<?xml version="1.0" encoding="UTF-8"?> <!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>comtag</shortname> <uri></uri> <tag> <name>recentMultTag</name> <tagclass>com.web.tags.RecentMultTag</tagclass> <bodycontent>empty</bodycontent> </tag> <tag> <name>genericMultTag</name> <tagclass>com.web.tags.GenericsTag</tagclass> <bodycontent>empty</bodycontent> </tag> </taglib>

any idea what this might be for? Also, what might be the JSTL 3.0 compatible version for this?

Makes it a difference to increase tlibversion to 1.1? Otherwise, to my surprise the TLD content should be still ok for Jakarta but it's an awfully long time ago I wrote some taglib POC/playground code.

<tlibversion>1.1</tlibversion>

I am assuming that "comtag.tld" won't be needed since I am getting rid of all the Struts tags. Please correct me if anyone thinks otherwise and explain. Not sure if there's anything I need to do in JSTL to compensate for the removal of this file.

Tim Holloway

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I can't find any docs on "com.web.tag". This may be an in-house custom tag library, as "com.web" is a questionable package name. And it's likely designed to work with Struts so assuming you can't find equivalents you may have to re-design it.

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