Method invoke

java/jakarta/el/LambdaExpression.java:75–116

Invokes the lambda expression with the given arguments in the specified EL context. The formal parameters are bound to the corresponding arguments, and the body expression is evaluated within a lambda scope. If the result is another lambda, the current arguments are made available to the nested lamb

(ELContext context, Object... args)

     * @throws ELException if the number of arguments is less than the number of formal parameters
     */
    @SuppressWarnings("null") // args[i] can't be null due to earlier checks
    public Object invoke(ELContext context, Object... args) throws ELException {

        Objects.requireNonNull(context);

        int formalParamCount = 0;
        if (formalParameters != null) {
            formalParamCount = formalParameters.size();
        }

        int argCount = 0;
        if (args != null) {
            argCount = args.length;
        }

        if (formalParamCount > argCount) {
            throw new ELException(Util.message(context, "lambdaExpression.tooFewArgs", Integer.valueOf(argCount),
                    Integer.valueOf(formalParamCount)));
        }

        // Build the argument map
        // Start with the arguments from any outer expressions so if there is
        // any overlap the local arguments have priority
        Map<String,Object> lambdaArguments = new HashMap<>(nestedArguments);
        for (int i = 0; i < formalParamCount; i++) {
            lambdaArguments.put(formalParameters.get(i), args[i]);
        }

        context.enterLambdaScope(lambdaArguments);

        try {
            Object result = expression.getValue(context);
            // Make arguments from this expression available to any nested
            // expression
            if (result instanceof LambdaExpression) {
                ((LambdaExpression) result).nestedArguments.putAll(lambdaArguments);
            }
            return result;
        } finally {
            context.exitLambdaScope();
        }
    }

    /**
     * Invokes the lambda expression with the given arguments using the EL context set by