Possible Cause -
The EAR file might be corrupt or incomplete.
Resolution -
Rebuild the Ear and deploy.
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Possible Cause -
Entry for the web project is missing within Ear.
Resolution -
Make sure the web project entry is correct in application.xml
Proper web project entries are there in build.xml
Make sure that the module ( web project ) has been included within EAR.
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Possible Cause -
taglib tag is not wrapped around the <jsp-config> tag
Resolution -
valid web.xml 2.4 with taglib declaration would be:
<jsp-config>
<taglib>...</taglib>
<taglib>...</taglib>
</jsp-config>