传递依赖性：在 AEM 中使用 Elasticsearch Rest High Client 问题

Question

我正在尝试使用 Adobe Experience Manager 中的 Java High Level Rest Client 来完成 Lucene、Solr 和 Elasticsearch 搜索引擎之间的比较项目.

我在使用 elasticsearch 实现 时遇到了一些问题。这是代码：

parent中的依赖pom.xml（核心中定义相同pom.xml）

<!-- Elasticseach dependencies -->
<dependency>
    <groupId>org.elasticsearch.client</groupId>
    <artifactId>elasticsearch-rest-high-level-client</artifactId>
    <version>7.4.0</version>
</dependency>

我使用的唯一一行代码来自上面的依赖项

try (RestHighLevelClient client = new 
RestHighLevelClient(RestClient.builder(new HttpHost(server, port, 
protocol),
  new HttpHost(server, secondPort, protocol)));)
{

}
catch (ElasticsearchException e)
{
    LOG.error("Exception: " + e);
}

protocol = "http", server = "localhost", port = 9200, secondPort = 9201

错误

来自 IntelliJ 的依赖项

我知道依赖版本通常有问题，但在这种情况下都是 7.4.0。此外，elasticsearch 7.4.0v 在 3 个节点上本地运行。

这个项目是在We.Retail项目上完成的，所以很容易复制。此外，所有出现此错误的代码都可在此处获得： https://github.com/tadijam64/search-engines-comparison-on-we-retail/tree/elasticsearch-integration AEM 6.4v.

如有任何信息或想法，我们将不胜感激。

更新我尝试添加以下内容以在外部嵌入这些依赖项，因为它们不是 OSGi 依赖项：

<build>
        <plugins>
            <plugin>
                <groupId>org.apache.felix</groupId>
                <artifactId>maven-scr-plugin</artifactId>
            </plugin>
            <plugin>
                <groupId>org.apache.felix</groupId>
                <artifactId>maven-bundle-plugin</artifactId>
                <extensions>true</extensions>
                <configuration>
                    <instructions>
                        <Embed-Dependency>org.apache.servicemix.bundles.solr-solrj, log4j, noggit, zookeeper,
                            elasticsearch-rest-high-level-client
                        </Embed-Dependency>
                        <Embed-Transitive>true</Embed-Transitive>
                        <Embed-Directory>OSGI-INF/lib</Embed-Directory>
                        <Export-Package>we.retail.core.model*</Export-Package>
                        <Import-Package>
                            *;resolution:=optional
                        </Import-Package>
                        <Private-Package>we.retail.core*</Private-Package>
                        <Sling-Model-Packages>
                            we.retail.core.model
                        </Sling-Model-Packages>
                    </instructions>
                </configuration>
            </plugin>
        </plugins>
    </build>

错误依旧。我也尝试将它添加到 "export-package"，但没有任何帮助。

到 Elasticsearch documentation，我需要使用 Elasticsearch 的是

<dependency>
    <groupId>org.elasticsearch.client</groupId>
    <artifactId>elasticsearch-rest-high-level-client</artifactId>
    <version>7.4.0</version>
</dependency>

但随后 NoClassDefFoundErrors 发生。这似乎是传递依赖性的问题。不确定，但任何想法都会受到赞赏。

其他一些建议可以在这里找到：https://forums.adobe.com/thread/2653586

我也试过添加它的传递依赖，比如 org.elasticsearch 和 org.elasticsearch.client，但它不起作用。同样的错误，只是其他 class.

AEM 版本 6.4，Java 版本：jdk1.8.0_191.jdk

Answer 1

所以我的猜测是正确的，虽然 <Embed-Transitive>true</Embed-Transitive> 存在但不包括传递依赖项。

当运行elasticsearch作为搜索引擎在AEM上时需要以下问题：

我在pom.xml中添加了所有传递依赖（版本在parent/pom.xml中定义）：

  <!-- Elasticsearch -->
      <dependency>
          <groupId>org.elasticsearch.client</groupId>
          <artifactId>elasticsearch-rest-high-level-client</artifactId>
      </dependency>
      <dependency>
          <groupId>org.elasticsearch.client</groupId>
          <artifactId>elasticsearch-rest-client</artifactId>
      </dependency>
      <dependency>
          <groupId>org.elasticsearch</groupId>
          <artifactId>elasticsearch</artifactId>
      </dependency>
      <dependency>
          <groupId>org.elasticsearch</groupId>
          <artifactId>elasticsearch-x-content</artifactId>
      </dependency>
      <dependency>
          <groupId>org.elasticsearch.plugin</groupId>
          <artifactId>rank-eval-client</artifactId>
      </dependency>
      <dependency>
          <groupId>org.apache.commons</groupId>
          <artifactId>commons-imaging</artifactId>
          <scope>test</scope>
      </dependency>
      <dependency>
          <groupId>org.elasticsearch.plugin</groupId>
          <artifactId>lang-mustache-client</artifactId>
      </dependency>
      <dependency>
          <groupId>org.apache.httpcomponents</groupId>
          <artifactId>httpasyncclient</artifactId>
      </dependency>

重要的是将所有第三方依赖项添加为<Embed-Dependency>在maven-bundle中-plugin 像这样：

    <plugin>
        <groupId>org.apache.felix</groupId>
        <artifactId>maven-bundle-plugin</artifactId>
        <extensions>true</extensions>
        <configuration>
            <instructions>
                <Embed-Dependency>org.apache.servicemix.bundles.solr-solrj, noggit,
                    elasticsearch-rest-high-level-client,
                    elasticsearch,
                    elasticsearch-rest-client,
                    elasticsearch-x-content,
                    elasticsearch-core,
                    rank-eval-client,
                    lang-mustache-client,
                    httpasyncclient;
                </Embed-Dependency>
                <Embed-Transitive>true</Embed-Transitive>
                <Embed-Directory>OSGI-INF/lib</Embed-Directory>
                <Export-Package>we.retail.core.model*</Export-Package>
                <Import-Package>
                    *;resolution:=optional
                </Import-Package>
                <Private-Package>
                    we.retail.core*
                </Private-Package>
                <Sling-Model-Packages>
                    we.retail.core.model
                </Sling-Model-Packages>
                <_fixupmessages>"Classes found in the wrong directory";is:=warning</_fixupmessages>
            </instructions>
        </configuration>
    </plugin>

Important to notice:

All third-party dependencies (the ones outside of OSGi) must be included in the "Embed-Dependency"

"Embed-Transitive" must be set to true to include transitive dependencies

"Import-Package" must include "*;resolution:=optional" to exclude all dependencies that could not be resolved so that the program can run normally

For some reason, there was an error in compile time when "elasticsearch" dependency was added which is not important for this task, so I've decided to ignore it this way:

<_fixupmessages>"Classes found in the wrong directory";is:=warning</_fixupmessages>

虽然困难重重，但我终于解决了。 Google上有很多相似或相同的问题，所以我希望这对某人有所帮助。感谢所有试图提供帮助的人。

传递依赖性：在 AEM 中使用 Elasticsearch Rest High Client 问题

Transitive Dependency: Using Elasticsearch Rest High Client problem in AEM

maven

elasticsearch

osgi

aem

elasticsearch-api