Eclipse does not yet support autocomplete EL. This is not so smart yet. IntelliJ Ultimate Edition supports it, and MyEclipse supports it as though they are both not free (when it comes to JSP / EL development).
JBoss Tools The Eclipse plugin supports it to a certain extent only for implicit / predefined EL objects, but not for custom ones, put it as an attribute in the request / session / application area yourself.
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