Method getMethod

java/org/apache/el/util/ReflectionUtil.java:153–348

(EvaluationContext ctx, Object base, Object property, Class<?>[] paramTypes,
            Object[] paramValues)

     * This class duplicates code in jakarta.el.Util. When making changes keep the code in sync.
     */
    @SuppressWarnings("null")
    public static Method getMethod(EvaluationContext ctx, Object base, Object property, Class<?>[] paramTypes,
            Object[] paramValues) throws MethodNotFoundException {

        if (base == null || property == null) {
            throw new MethodNotFoundException(
                    MessageFactory.get("error.method.notfound", base, property, paramString(paramTypes)));
        }

        String methodName = (property instanceof String) ? (String) property : property.toString();

        int paramCount;
        if (paramTypes == null) {
            paramCount = 0;
        } else {
            paramCount = paramTypes.length;
        }

        Class<?> clazz = base.getClass();

        // Fast path: when no arguments exist, there can only be one matching method and no need for coercion.
        if (paramCount == 0) {
            Method result = null;
            Throwable t = null;
            try {
                Method method = clazz.getMethod(methodName, paramTypes);
                result = getMethod(clazz, base, method);
            } catch (NoSuchMethodException | SecurityException e) {
                // Fall through
                t = e;
            }
            if (result == null) {
                throw new MethodNotFoundException(
                        MessageFactory.get("error.method.notfound", base, property, paramString(paramTypes)), t);
            }
            return result;
        }

        Method[] methods = clazz.getMethods();
        Map<Method,MatchResult> candidates = new HashMap<>();

        for (Method m : methods) {
            if (!m.getName().equals(methodName)) {
                // Method name doesn't match
                continue;
            }

            Class<?>[] mParamTypes = m.getParameterTypes();
            int mParamCount = mParamTypes.length;

            // Check the number of parameters
            // Multiple tests to improve readability
            if (!m.isVarArgs() && paramCount != mParamCount) {
                // Method has wrong number of parameters
                continue;
            }
            if (m.isVarArgs() && paramCount < mParamCount - 1) {
                // Method has wrong number of parameters