Eclipse cannot find the tag library descriptor for custom tags not JSTL

Question

I have a Java EE project which build fine with Ant  deploys perfectly to JBoss  and runs without any trouble  This project includes a few custom tag libraries  which is not JSTL    which are also working without any difficulties   The problem is with the Eclipse IDE  Ganymede   in every single JSP file which uses our custom tags  the JSP parser flags the taglib include line with with this error   Cannot find the tag library descriptor for  example  tld  This also causes every use of the tab library to be flagged as an error  and since the IDE doesn t have their definition  it can t check tag parameters  etc   Our perfectly-working JSP files are a sea of red errors  and my eyes are beginning to burn   How can I simply tell Eclipse   The tag library descriptor you are looking for is  src web WEB-INF  example -taglib  example  tld    I ve already asked this question on the Eclipse support forums  with no helpful results

User · Answer

This was my problem and how I fixed it     I had done everything everyone had mentioned above etc  but was still getting this error   Turns out I was using the uri s of http   java sun com jsp jstl fmt and http   java sun com jsp jstl core which were incorrect   Try switching the uris from above to   http   java sun com jstl fmt http   java sun com jstl core   Also  make sure you have the correct jars referenced in your class path

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A lot depends on what kind of project it is   WTP s JSP support either expects the JSP files to be under the same folder that s the parent of the WEB-INF folder  src web  which it will then treat as     to find TLDs   or to have project metadata set up to help it know where that root is  done for you in a Dynamic Web Project through Deployment Assembly    How are you referring to the TLD file  and where is the JSP file located   And maybe I missed the original post to the Eclipse forums  the one I saw was posted a full day after this one

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In Eclipse Helios  Java EE Module Dependencies  in the project properties has been replaced with  Deployment Assembly     So for solving this problem with Eclipse Helios  the way I did it is the following    Right click on the project in package explorer and choose  Import     Accept the default selection  File System  and press  Next  Press  Browse  in the From directory line  go to your tomcat installation and locate the file webapps examples WEB-INF lib  I have tomcat 6  other versions of Tomcat may have the path webapps jsp-examples WEB-INF lib   Once in the path press OK  Click besides jstl jar and standard jar to activate the check boxes On the line Into folder click on Browse and choose the library folder  I use  lib inside the project  Click  Finish  Right click on the project in Package Explorer view and choose properties  or press Alt   Enter  Click on  Java Build Path   Click  Add Jar   click on your project  folder lib  select jstl jar  press OK Click  Add Jar   click on your project  folder lib  select standard jar  press OK Press OK to dismiss the properties dialog Click on the Problems view and select the message  Classpath entry     jstl jar will not be exported or published  Runtime ClassNotFoundExceptions may result     Right click on it and select  Quick Fix   Accept the default  Mark the associated raw classpath entry as a publish export dependency  and press Finish  Do the same for standard jar         This solves the problem  but if you want to check what has happened in  Deployment Assembly   open the project properties again  select  Deployment Assembly  and you ll see that standard jar and jstl jar have been added to WEB-INF lib folder

User · Answer

I also faced the same problem  Make sure you have same versions of JSTL in Eclipse and in the Tomcat work directory  i e in  webapps examples WEB-INF lib and in lib folder

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Ran into the same problem  I m using maven so I added this to the pom in my web project    lt dependency gt       lt groupId gt javax servlet lt  groupId gt       lt artifactId gt jstl lt  artifactId gt       lt version gt 1 2 lt  version gt   lt  -- just used the latest version  make sure you use the one you need -- gt       lt scope gt provided lt  scope gt   lt  dependency gt    This fixed the problem and I used  provided  scope because like the OP  everything was already working in JBoss   Here s where I found the solution  http   alfredjava wordpress com 2008 12 22 jstl-connot-resolved

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Check the two libraries in F  apache-tomcat-7 0 21 webapps examples WEB-INF lib    jstl jar standard jar

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If your tld s are on the classpath  typically under the WEB-INF directory  the following two tips should resolve the issue  irrespective of your environment setup     Ensure that the  lt uri gt  in the TLD and the uri in the taglib directive of your jsp pages match  The  lt uri gt  element of the tld is a unique name for the tag library  If the tld does not have a  lt uri gt  element  the Container will attempt to use the uri attribute in the taglib directive as a path to the actual TLD  for e g  I could have a custom tld file in my WEB-INF folder and use the path to the this tld as the uri value in my JSP  However  this is a bad practice and should be avoided since the paths would then be hardcoded

User · Answer

well you need to understand there are always two things the API and the implementation  mind the gradle format of the following code   compile group  javax servlet jsp jstl   name  javax servlet jsp jstl-api   version  1 2 1   compile group  org glassfish web   name  javax servlet jsp jstl  version  1 2 1   so If you re using a servlet container with no jstl support then of course it will not provide both of them  a mistake which I made is that I only put the first one  but if you re using full stack application server i e glassfish then glassfish will have both of them already inside

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I fixed this problem today     Change your output directory to your WEB-INF classes folder   Project Properties Java Build Path  Default output folder  Assigne the module dependencies   Project Properties Java EE Module Dependencies  they will be copied to the WEB-INF lib folder where Eclipse looks for the tag lib definitions too    I hope it helps

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It turns out that the cause was that this project wasn t being considered by Eclipse to actually be a Java EE project at all  it was an old project from 3 1  and the Eclipse 3 5 we are using now requires several  natures  to be set in the project configuration file    lt natures gt       lt nature gt org eclipse jdt core javanature lt  nature gt       lt nature gt InCode inCodeNature lt  nature gt       lt nature gt org eclipse dltk javascript core nature lt  nature gt       lt nature gt net sf eclipsecs core CheckstyleNature lt  nature gt       lt nature gt org eclipse wst jsdt core jsNature lt  nature gt       lt nature gt org eclipse wst common project facet core nature lt  nature gt       lt nature gt org eclipse wst common modulecore ModuleCoreNature lt  nature gt       lt nature gt org eclipse jem workbench JavaEMFNature lt  nature gt   lt  natures gt    I was able to find the cause by creating a new  Dynamic Web Project  which properly read its JSP files  and diffing against the config of the older project   The only way I could find to add these was by editing the  project file  but after re-opening the project  everything magically worked   The settings referenced by pribeiro  above  weren t necessary since the project already conformed to the default settings   Both pribeiro and nitind s answers gave me ideas to jumpstart my search  thanks   Is there a way of editing these  natures  from within the UI

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replace jstl jar to jstl1 2 jar resolved the issue for tomcat 7 0

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On the other hand  if you are only working on java source and are getting these errors from stuff you don t touch in a large project that is working  you can just turn off the validations in Eclipse  The settings are under Preferences- Web- JSP Files- Validation

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When I tried to include the JSTL Core Library in my JSP    lt    taglib prefix  c  uri  http   java sun com jsp jstl core    gt    I got the following error in Eclipse  Indigo    Can not find the tag library descriptor for  http   java sun com jsp jstl core    I went to the Project Properties -  Targeted Runtimes  and then checked the Server I was using  Geronimo 3 0   Most people would be using Tomcat  This solved my problem  Hope it helps

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You can simply go to Build Path -  Add Libraries and for the library type to add select  Server Runtime    Click Next and select a server runtime to add to the classpath and the problem goes away if jstl jar and standard jar are in your server s classpath

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For me  this error occurs whenever I try to use a new version of eclipse  Apparently  the new eclipse resets the M2 REPO variable and I get all the tag library error in the Marker view  sometimes with ejb validation errors    After updating M2 REPO variable to point to actual maven repository location  it takes 2-3 Project -  Clean iterations to get everything working   And sometimes  there are some xml validation errors ejb  along with this tag library errors  Manually updating the corresponding XML file  initiates a   xsd file lookup and the xml validations errors are resolved  Post this  the tag library errors also vanish

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I was having the same problem using Tomcat 6 0 and Eclipse and I tried out something which my friend suggested and it worked for me  The link for the question I asked and my reply commented can be found here   JSTL Tomcat 6 0 Cannot find the taglib descriptor Error  Let me know if this solves your  Cannot find the taglibrary descriptor  problem

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I faced same problem  This is what I did to resolve the issue    Select Project and right click  Click on properties  Click on libraries tab  Click on  Add Jars   Add relevant jar for your error

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I had the same problem with MyEclipse and Eclipse 6 6 0  It red lined the uri value in every    lt    taglib prefix  s  uri   struts-tags   gt   I fixed it by going to  Project MyEclipse Web Tag Libraries  and setting the Default TLD Prefix for Struts 1 2 Tiles Tags to  s   I also had to do the same under  Project MyEclipse Web Configure workspace settings    Tag Libraries

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This error can arise from several different sources  One case  not mentioned in other answers to this question  occurs when Eclipse does not implement the version of the JSP specification set in the TLD document  Eclipse releases typically lag behind up to a year in implementing newer servlet and JSP specifications  See this Eclipse bug for example   In this case  your web application may run fine in the latest version of Tomcat  but Eclipse may still complain about a missing TLD  The short term solution  short of ignoring the error in Eclipse  is to bump down the JSP version to the one that your version of Eclipse supports   Also  keep in mind the TLD version you are implementing  The tag names have changed slightly from v1 1 to v2 0  i e   info is now description on taglib and is not a valid element under tag  many of the element names now contain a hyphen   Eclipse has no tolerance for misspelled TLD tag names   TLD 2 0  jsp-version 2 0  Reference  TLD 2 1  jsp-version 2 3  Reference

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I had the same problem with a stripes taglib uri showing as not found  I was using Indigo and Maven and when I checked Properties- Java Build Path- Order  amp  Export Tab I found  on a fresh project checkout  that the  Maven Dependencies  checkbox was unchecked for some reason  Simply checking that box and doing a Maven clean install cleared all the errors    I wonder why Eclipse doesn t assume I want my Maven dependencies in the build path

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I had the same problem with STS  springtool source suite    Under STS  right click on the project  than  Properties    Project Facets   than on the right of the window click on the  runtime  tab  and check  VMware vFabric tc Server         and click  Apply  and it should be OK after the workspace refresh

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I m using Spring STS plugin and a Spring webmvc template project  I had to install the Maven m2e plugin first  http   www eclipse org m2e   And then clean the project  Under Project - gt  Clean

[java] Eclipse "cannot find the tag library descriptor" for custom tags (not JSTL!)

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