[java] How can I show an image using the ImageView component in javafx and fxml?

You don't need an initializer, unless you're dynamically loading a different image each time. I think doing as much as possible in fxml is more organized. Here is an fxml file that will do what you need.

<?xml version="1.0" encoding="UTF-8"?>

<?import java.lang.*?>
<?import javafx.scene.image.*?>
<?import javafx.scene.layout.*?>

<AnchorPane
    xmlns:fx="http://javafx.co/fxml/1"
    xmlns="http://javafx.com/javafx/2.2"
    fx:controller="application.SampleController"
    prefHeight="316.0"
    prefWidth="321.0"
    >
    <children>
        <ImageView
                fx:id="imageView"
                fitHeight="150.0"
                fitWidth="200.0"
                layoutX="61.0"
                layoutY="83.0"
                pickOnBounds="true"
                preserveRatio="true"
            >
            <image>
                <Image
                    url="src/Box13.jpg"
                    backgroundLoading="true"
                    />
            </image>
        </ImageView>
    </children>
</AnchorPane>

Specifying the backgroundLoading property in the Image tag is optional, it defaults to false. It's best to set backgroundLoading true when it takes a moment or longer to load the image, that way a placeholder will be used until the image loads, and the program wont freeze while loading.