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SpEL cannot invoke varargs MethodHandle function with zero variable arguments #33190

@sbrannen

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@sbrannen

The Spring Expression Language (SpEL) currently cannot invoke a varargs MethodHandle function with zero variable arguments.

Attempting to do so results in a SpelEvaluationException with an INCORRECT_NUMBER_OF_ARGUMENTS_TO_FUNCTION message.

For example, given a MethodHandle registered as a function named format that accepts (String, Object...), the SpEL expression #format('x', 42) is supported, but the expression #format('x') fails even though the variable arguments are not required.

The following assertion in our test suite should therefore not actually fail due to a SpelEvaluationException with an INCORRECT_NUMBER_OF_ARGUMENTS_TO_FUNCTION message but rather due to an exception thrown from java.lang.String.formatted(Object...), which that #message() function invokes on the first argument.

evaluateAndCheckError("#message('%s')", INCORRECT_NUMBER_OF_ARGUMENTS_TO_FUNCTION, 0, "message", 1, 2);

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in: coreIssues in core modules (aop, beans, core, context, expression)type: bugA general bug

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