Invoke method with varargs in EL throws java.lang.IllegalArgumentException: wrong number of arguments

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No, it is not possible to use variable arguments in EL method expressions, let alone EL functions.

Your best bet is to create multiple different named methods with a different amount of fixed arguments. 

public static boolean isValueIn2(Integer value, Integer option1, Integer option2) {}
public static boolean isValueIn3(Integer value, Integer option1, Integer option2, Integer option3) {}
public static boolean isValueIn4(Integer value, Integer option1, Integer option2, Integer option3, Integer option4) {}
// ...

As a dubious alternative, you could pass a commaseparated string and split it inside the method

#{webUtilMB.isValueIn(OtherBean.category.id, '2,3,5')}

or even a string array which is created by fn:split() on a commaseparated string

#{webUtilMB.isValueIn(OtherBean.category.id, fn:split('2,3,5', ','))}

but either way, you’d still need to parse them as integer, or to convert the passed-in integer to string.

In case you’re already on EL 3.0, you could also use the new EL 3.0 collection syntax without the need for the whole EL function.

#{[2,3,5].contains(OtherBean.category.id)}

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