PropertySupport.java 文件源码

public T getValue() throws IllegalAccessException, IllegalArgumentException, InvocationTargetException {
    if (getter == null) {
        throw new IllegalAccessException();
    }

    Object valideInstance = Beans.getInstanceOf(instance, getter.getDeclaringClass());

    try {
        try {
            return cast(getValueType(), getter.invoke(valideInstance));
        } catch (IllegalAccessException ex) {
            try {
                getter.setAccessible(true);

                return cast(getValueType(), getter.invoke(valideInstance));
            } finally {
                getter.setAccessible(false);
            }
        }
    } catch (IllegalArgumentException iae) {
        //Provide a better message for debugging
        StringBuffer sb = new StringBuffer("Attempted to invoke method ");
        sb.append(getter.getName());
        sb.append(" from class ");
        sb.append(getter.getDeclaringClass().getName());
        sb.append(" on an instance of ");
        sb.append(valideInstance.getClass().getName());
        sb.append(" Problem:");
        sb.append(iae.getMessage());
        throw (IllegalArgumentException) new IllegalArgumentException(sb.toString()).initCause(iae);
    }
}