Solution: move the jstl-xxx.jar and standard-xxx.jar under pluto-xxx\webapps\pluto\WEB-INF\lib into pluto\lib
Note: do not include these jars files:
1. jstl-api-1.2.jar
2. jstl-impl-1.2.jar
3. pluto-taglib-2.0.2.jar
4. portlet-api-2.0.jar
in your portlet application (war file).
Source: http://forum.springsource.org/showthread.php?57816-Exception-when-loading-application
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