问题
I've found the instanceof operator in JSF EL, but it throws an exception when used. It's obviously reserved but not implemented? When will it (probably) be available, if not already in a newer version than JSF 1.2, which I'm currently using?
回答1:
The keyword instanceof is indeed reserved in the EL (see here), but it is still not used in the latest version of EL (2.2), used in JSF 2.x.
来源：https://stackoverflow.com/questions/5549999/jsf-el-instanceof-reserved-but-not-yet-implemented