java - 调用方法 osgi aem read 子服务时发生 com.sun.jdi.InitationException

Question

当我在 AEM 6.4 中使用子服务读取模板的详细信息时，我在错误日志中收到空指针异常

map.get 给出空指针异常

错误消息为

com.adobe.cq.sightly.WCMUsePojo Failed to activate Use class java.lang.IllegalArgumentException: javax.jcr.RepositoryException: This session has been closed. at org.apache.sling.jcr.resource.internal.JcrValueMap.readFully(JcrValueMap.java:395) [org.apache.sling.jcr.resource:3.0.8] at org.apache.sling.jcr.resource.internal.JcrValueMap.entrySet(JcrValueMap.java:183) [org.apache.sling.jcr.resource:3.0.8] at com.mysite.core.helpers.AnalyticsHelper.activate(AnalyticsHelper.java:138) [mysite-core:1.0.0.SNAPSHOT] at com.adobe.cq.sightly.WCMUsePojo.init(WCMUsePojo.java:86) [com.adobe.cq.sightly.cq-wcm-sightly-extension:1.5.12]

它在 AEM 6.3 中运行良好，但在 AEM 6.4 中，它给出空指针异常

map 为空。当我删除关闭资源解析器时它工作正常

MysiteReadTemplateService mysiteReadTemplateService = getSlingScriptHelper()
                .getService(MysiteReadTemplateService .class);
        ValueMap map = mysiteReadTemplateService 
                .fetchTemplateDetails(templatePath);
        if (map != null) {
            templateName = map.get("jcr:title", "");
            templateDescription = map.get("jcr:description", "");
        }

在 fetchTemplateDetails 方法内部 -

Map<String,Object> paramMap = new HashMap<String,Object>();
          //Mention the subServiceName that is configured in the User Mapping
          paramMap.put(ResourceResolverFactory.SUBSERVICE, "mysitereadservice");
          log.info("After the param");
          ResourceResolver rr = null;
          ValueMap map =null;
          try{
                rr = resourceFactory.getServiceResourceResolver(paramMap);
                log.info("UserId : " + rr.getUserID());
                Resource templateResource = rr.getResource(templatePath);
                log.info("Resource : " + templateResource.getPath());
                map = templateResource.getValueMap();  
                rr.close();
          }catch(Exception e){
                log.error(e.getMessage());
          }
          return map;

当rr.close被注释时，analyticshelper类中的map不为null。

可能的解释在

中提供

com.sun.jdi.InvocationException occurred invoking method

但是，我们仍然希望关闭资源解析器，因为不关闭它会创建许多未关闭的 session 。

如果有人遇到同样的问题，请告诉我们您的想法，或者我如何重构代码以便我们能够关闭资源解析器并且 map 不为空。

Answer 1

关闭 session /资源解析器后，您将无法访问资源或属性(ValueMap)。将您的数据放入另一个数据结构(Collection、Map)中并返回它。或者在 session 打开时执行您的操作:

Map<String, Object> result = new HashMap<String, Object>;
ResourceResolver rr = null;

try{
    Map<String,Object> paramMap = new HashMap<String,Object>();
    //Mention the subServiceName that is configured in the User Mapping
    paramMap.put(ResourceResolverFactory.SUBSERVICE, "mysitereadservice");
    log.info("After the param");
    rr = resourceFactory.getServiceResourceResolver(paramMap);

    if (rr != null) {
        log.info("UserId : " + rr.getUserID());

        Resource templateResource = rr.getResource(templatePath);

        if (templateResource != null) {
            log.info("Resource : " + templateResource.getPath());
            ValueMap map = templateResource.getValueMap();  

            result.put("jcr:title", map.get("jcr:title",""))
            result.put(......);
            result.put(......);
            result.put(......);
            result.put(......);
            result.put(......);
        }
    }
}catch(LoginException e){
    log.error(e.getMessage(), e);
} finally {
    if (rr != null && !rr.isLive()) {
        rr.close();
    }
}

return result;

ResourceResulver应该在finally block 中关闭，或者使用try-with-resources:

try (ResourceResolver rr = resourceFactory.getServiceResourceResolver(paramMap)) {
    //yourCode
} catch (LoginException e) {
    log.errror(e.getMessage(), e);
}