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无法将模型类调整为slinghttpservletrequest

sling-models aem

0

Vivek Dhiman · 技术社区 · 6 年前

我正试图在我的模型类中注入资源。使用注释时遇到的问题 @Model(adaptables = { SlingHttpServletRequest.class, Resource.class })

我将对象作为空值获取,而仅使用resource.class,我将获取对象(navigationitems)。下面是我班的一小段。你能告诉我修理它的步骤吗?

import org.apache.sling.api.SlingHttpServletRequest;
import org.apache.sling.api.resource.Resource;
import org.apache.sling.models.annotations.Model;
import org.apache.sling.models.annotations.Optional;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.annotation.PostConstruct;
import javax.inject.Inject;
import javax.inject.Named;
import java.util.List;

@Model(adaptables =  { SlingHttpServletRequest.class, Resource.class })
public class Header {
    private final Logger logger = LoggerFactory.getLogger(getClass());

    @Inject
    @Optional
    @Named("navitems")
    private Resource navigationItems;

    List<SiteNavigation> siteNavigationList;

    @PostConstruct
    protected void init() {
        logger.info("In init method of header model.");
        siteNavigationList = getSiteNavigationListItems(getNavigationItems());
    }

    private List<SiteNavigation> getSiteNavigationListItems(final Resource navigationItems, final Resource columnFourItems) {
        return null;
    }

    public Resource getNavigationItems() {
        return navigationItems;
    }
}

如果删除可选注释,则会出现以下错误:

28.09.2018 14:04:39.735 *ERROR* [0:0:0:0:0:0:0:1 [1538123679033] GET /conf/myprj/settings/wcm/templates/homepage/structure.html HTTP/1.1] com.day.cq.wcm.core.impl.WCMDeveloperModeFilter Error during include of SlingRequestPathInfo: path='/conf/myprj/settings/wcm/templates/homepage/structure/jcr:content/root/header', selectorString='null', extension='html', suffix='null'
org.apache.sling.api.SlingException: Cannot get DefaultSlingScript: Identifier com.myprj.core.models.Header cannot be correctly instantiated by the Use API
    at org.apache.sling.scripting.core.impl.DefaultSlingScript.service(DefaultSlingScript.java:510) [org.apache.sling.scripting.core:2.0.54]
    at org.apache.sling.engine.impl.request.RequestData.service(RequestData.java:552) [org.apache.sling.engine:2.6.12]

    Caused by: org.apache.sling.models.factory.MissingElementsException: Could not inject all required fields into class com.myprj.core.models.Header
    at org.apache.sling.models.impl.ModelAdapterFactory.createObject(ModelAdapterFactory.java:679) [org.apache.sling.models.impl:1.4.7.T20180205124646-b0647a3]
    at org.apache.sling.models.impl.ModelAdapterFactory.internalCreateModel(ModelAdapterFactory.java:394) [org.apache.sling.models.impl:1.4.7.T20180205124646-b0647a3]
    at org.apache.sling.models.impl.ModelAdapterFactory.createModel(ModelAdapterFactory.java:261) [org.apache.sling.models.impl:1.4.7.T20180205124646-b0647a3]
    at org.apache.sling.scripting.sightly.models.impl.SlingModelsUseProvider.provide(SlingModelsUseProvider.java:126) [org.apache.sling.scripting.sightly.models.provider:1.0.6]
    at org.apache.sling.scripting.sightly.impl.engine.extension.use.UseRuntimeExtension.call(UseRuntimeExtension.java:73) [org.apache.sling.scripting.sightly:1.0.48.1_3_1]
    ... 243 common frames omitted
    Suppressed: org.apache.sling.models.factory.MissingElementException: Could not inject private org.apache.sling.api.resource.Resource com.myprj.core.models.Header.navigationItems
        at org.apache.sling.models.impl.ModelAdapterFactory.createObject(ModelAdapterFactory.java:684) [org.apache.sling.models.impl:1.4.7.T20180205124646-b0647a3]
        ... 247 common frames omitted
    Caused by: org.apache.sling.models.factory.ModelClassException: No injector returned a non-null value!
        at org.apache.sling.models.impl.ModelAdapterFactory.injectElement(ModelAdapterFactory.java:581) [org.apache.sling.models.impl:1.4.7.T20180205124646-b0647a3]
        at org.apache.sling.models.impl.ModelAdapterFactory.createObject(ModelAdapterFactory.java:682) [org.apache.sling.models.impl:1.4.7.T20180205124646-b0647a3]
        ... 247 common frames omitted

2 回复 | 直到 6 年前

1

Saravana Prakash 6 年前

代码中有3个指针:

虽然sling9支持多个可适配项,但最好 adapt from slinghttpservetlRequest对象。它位于较高的层,并包裹着大多数其他对象。
建议您增加喷油器 specific 而不是一般的@inject。
总是指定 resourceType attribute 将模型与特定资源类型关联。对于碎片的导出者来说,吊索可以关联得更紧密,可读性更好。

这将是我对你的吊索型号的代码:

@Model(adaptables = SlingHttpServletRequest.class, resourceType = "myprj/components/content/header",
  defaultInjectionStrategy = DefaultInjectionStrategy.OPTIONAL)
public class Header {

  @ChildResource
  private Resource navitems; // Keeping resource name and attribute name identical reduces @Named annotation

2

0

Vivek Dhiman 6 年前

此问题通过@via注释解决。下面是我使用的代码片段。

@Inject
    @Via("resource")
    @Named("navitems")
    private Resource navigationItems;