Sightly：为现有方法抛出空指针异常

Question

我正在尝试创建自己的图像句柄。 class 使用用户定义的 class MySmartImage.java，它具有 com.day.cq.wcm.foundation.Image 和两个字符串属性及其 getter setter，如下所示。

public class MySmartImage extends WCMUse {

    private Image image;
    private String titleText;
    private String descText;

    @PostConstruct
    public void activate() {

    }

    public MySmartImage(Resource resource) {
        this.image = new Image(resource);

    }

    public MySmartImage(Image image, String titleText, String descText) {
        this.image = image;
        this.titleText = titleText;
        this.descText = descText;
    }

    public MySmartImage(Resource resource, String titleText, String descText) {
        this.image = new Image(resource);
        this.titleText = titleText;
        this.descText = descText;
    }

    public Image getImage() {

        return image;
    }

    public String getTitleText() {
        return "test";
    }

    public void setImage(Image image) {
        this.image = image;
    }

    public void setTitleText(String titleText) {
        this.titleText = titleText;
    }

    public void setDescText(String descText) {


        this.descText = descText;
    }

    public String getDescText() {
        return descText;
    }

}

而我的处理程序如下：

您好，我现在已经在处理程序中按如下方式实现了 getImages。

public class ImageHandler 扩展了 WCMUse {

private String param;

private static Resource resource;

private Test test;

private List<MySmartImage> images = new ArrayList<MySmartImage>();

@Override
public void activate() throws Exception {
   resource = getResource();
    test = new Test();
    //images = this.getImages();
   //param = get("param", String.class);
}

public List<MySmartImage> getImages() {

    System.out.println("Resouce ::::" + resource);
    List<MySmartImage> images = new ArrayList<MySmartImage>();
    Resource imagesResource = resource.getChild("images");
    System.out.println("Images ::::" + images);

    if (imagesResource == null) {
        return images;
    }

    ValueMap map = imagesResource.adaptTo(ValueMap.class);
    String order = map.get("order", String.class);

    if (order == null) {
        return images;
    }

    System.out.println("Order :::: " + order);


    JSONArray array; ValueMap vMap;

    try {
        array = new JSONArray(order);
    } catch (JSONException e) {
        array = new JSONArray();
    }

    for (int i = 0; i < array.length(); i++) {
        String imageResourceName;

        try {
            imageResourceName = array.getString(i);
        } catch (JSONException e) {
            imageResourceName = null;
        }

        System.out.println("image resource name :::: " + imageResourceName);

        if (imageResourceName != null) {
            Resource imageResource = imagesResource.getChild(imageResourceName);

            System.out.println("imageResource :::: " + imageResource);

            if (imageResource != null) {
                Iterator childImagesItr = imageResource.listChildren();

                System.out.println("childImagesItr :::: " + childImagesItr);

                while(childImagesItr.hasNext()){
                    Resource childImage = (Resource)childImagesItr.next();
                    Image image = new Image(childImage);
                    image.setItemName(Image.PN_REFERENCE,"imageReference");
                    image.setSelector("img");
                    image.setAlt(childImage.getName());

                    vMap = imageResource.adaptTo(ValueMap.class);
                    String title = vMap.get("titleText", String.class);
                    String desc = vMap.get("descText", String.class);
                    MySmartImage img = new MySmartImage(childImage);
                    img.setTitleText(title);
                    img.setDescText(desc);
                    images.add(img);
                    System.out.println("image added in images :::: " + images.size());
                }
            }
        }
    }

    System.out.println("image added in images :::: " + images.getClass());
    return images;
}

}

因此，在我的视觉页面上，我正尝试按如下方式访问图像处理程序。

<div data-sly-use.handle="ImageHandler">

    <div data-sly-list.image="${handle.images }">
   -----${image.titleText}

    </div>

</div>

给出以下异常

org.apache.sling.scripting.sightly.SightlyException: java.lang.NullPointerException at org.apache.sling.scripting.sightly.impl.engine.runtime.RenderContextImpl.getObjectNoArgMethod(RenderContextImpl.java:350) at org.apache.sling.scripting.sightly.impl.engine.runtime.RenderContextImpl.getObjectProperty(RenderContextImpl.java:323) at org.apache.sling.scripting.sightly.impl.engine.runtime.RenderContextImpl.getProperty(RenderContextImpl.java:281) at org.apache.sling.scripting.sightly.impl.engine.runtime.RenderContextImpl.resolveProperty(RenderContextImpl.java:103) at apps.gbp.components.content.c_stage2.SightlyJava_c_stage2.render(SightlyJava_c_stage2.java:54) at org.apache.sling.scripting.sightly.impl.engine.runtime.RenderUnit.render(RenderUnit.java:52) at org.apache.sling.scripting.sightly.impl.engine.SightlyScriptEngine.evaluateScript(SightlyScriptEngine.java:95) at org.apache.sling.scripting.sightly.impl.engine.SightlyScriptEngine.eval(SightlyScriptEngine.java:83)

Answer 1

似乎 sling 方法自省找不到 getter。

猜猜是 div data-sly-list.image="${handle.images }">。在您的处理程序中实施 getImages()。

Sightly：为现有方法抛出空指针异常

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