maven - 传递依赖 : Using Elasticsearch Rest High Client problem in AEM

Question

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

我在 elasticsearch 实现 方面遇到了一些问题。这是代码:

• 父pom.xml中的依赖(核心pom.xml中定义相同)

  <!-- 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

我知道依赖版本通常有问题，但在这种情况下都是 7.4.0。 elasticsearch 7.4.0v 也在 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-integrationAEM 6.4v。

欢迎提供任何信息或想法。

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>

错误依然存在。我也尝试将它添加到“export-package”，但没有任何帮助。

然后 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>

但是 NoClassDefFoundErrors 发生了。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

我也尝试添加它的传递依赖项，如 org.elasticsearch 和 org.elasticsearch.client，但它不起作用。同样的错误，只是其他类。

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> 没有包含传递依赖项|存在。

在 AEM 上将 elasticsearch 作为搜索引擎运行时需要以下问题:

• 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作为<Embed-Dependency>添加到ma​​ven-bundle-plugin中，如下所示:

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

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

尽管具有挑战性，但我终于解决了它。谷歌上有很多类似或相同的问题，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。