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see for details: http://jira.codehaus.org/browse/MEVENIDE-487 there is a problem with one specific tag lib URI: "The absolute uri: http://java.sun.com/jsp/jstl/core cannot be resolved in either web.xml or the jar files deployed with this application." MEVENIDE-487 has an attached test.zip with a sample setup in maven. use the maven modules binaries from the dev update center or from nbextra's deadlock hudson.
It's probably connected with the jspparser system classloader, which is used for certain types of libraries. The JSTL library is one of them.
I tested this issue with the new jsp parser and it looks, that the issue will be fixed, when I integrate this new jsp parser in the trunk. I'will do it next week, after stabilization phase of M8.
Fixed, see issue #105427
V.