错误liferay：MVC Portlet don＆＃x27;

Question

Liferay的Ima Bigenner，我跟随一家Tutoriel，使用Maven将服务构建器连接到Liferay的外部数据库。 我添加我的外部数据库如下：

jdbc.ext.url=jdbc:postgresql://localhost:8085/MyDB2
jdbc.ext.username=postgres
jdbc.ext.password=myPassWord

然后创建我的服务构建器，该构建器构建良好

<?xml version="1.0"?>
<!DOCTYPE service-builder PUBLIC "-//Liferay//DTD Service Builder 7.4.0//EN" "http://www.liferay.com/dtd/liferay-service-builder_7_4_0.dtd">

<service-builder dependency-injector="spring" package-path="ntlink.db">
   <namespace>ntlink</namespace>
   <entity name="Candidat" local-service="true" table="candidats" data-source="candidat">
       <column name="id_candidat" type="int" primary="true"></column>
       <column name="nom_candidat" type="String"></column>
       <column name="prenom_candidat" type="String"></column>
       <column name="email_candidat" type="String"></column>
       <column name="motdepass_cnandidat" type="String"></column>
   </entity>
</service-builder>

，然后现在我拥有我的API.Jar和Service.jar，其中两个在我的./m2文件夹中 然后我创建我的MVC portlet：

@SuppressWarnings("unused")
@Component(
   immediate = true,
   property = { 
       "com.liferay.portlet.display-category=category.sample",
       "com.liferay.portlet.header-portlet-css=/css/main.css",
       "com.liferay.portlet.instanceable=true",
       "javax.portlet.display-name=Candidat",
       "javax.portlet.init-param.template-path=/",
       "javax.portlet.init-param.view-template=/view.jsp",
       "javax.portlet.name=" + CandidatPortletKeys.CANDIDAT,
       "javax.portlet.resource-bundle=content.Language",
       "javax.portlet.security-role-ref=power-user,user"
   },
   service = Portlet.class
) 
public class CandidatPortlet extends MVCPortlet { 
   
   
   @Reference
   private volatile CandidatLocalService candidatLocalService;
   
  @Override
public void doView(RenderRequest renderRequest, RenderResponse renderResponse)
       throws java.io.IOException, PortletException {
      try {
          System.out.println("hello");
       System.out.println("values===>"+ candidatLocalService.getCandidat(1).getEmail_candidat());
   } catch (PortalException e) {
       // TODO Auto-generated catch block
       e.printStackTrace();
   }
   super.doView(renderRequest, renderResponse);
}
 
}

用注释@Reference我的portlet不会出现在窗口小部件和gogo shell中，我发现了此错误

Config Props: (11 entries)
 com.liferay.portlet.display-category<String> = category.sample
 com.liferay.portlet.header-portlet-css<String> = /css/main.css
 com.liferay.portlet.instanceable<String> = true
 component.id<Long> = 9479
 component.name<String> = candidat.portlet.CandidatPortlet
 javax.portlet.display-name<String> = Candidat
 javax.portlet.init-param.template-path<String> = /
 javax.portlet.init-param.view-template<String> = /view.jsp
 javax.portlet.name<String> = candidat_CandidatPortlet
 javax.portlet.resource-bundle<String> = content.Language
 javax.portlet.security-role-ref<String> = power-user,user
References:   (total 1)
 - candidatLocalService: ntlink.db.service.CandidatLocalService UNSATISFIED 1..1 dynamic
   target=(*) scope=bundle

，因此当我删除注释@Reference或用@BeanReference替换时，我得到了这个错误。错误

java.lang.NullPointerException: null
    at candidat.portlet.CandidatPortlet.doView(CandidatPortlet.java:59) ~[?:?]
    at com.liferay.portal.kernel.portlet.LiferayPortlet.doDispatch(LiferayPortlet.java:303) ~[portal-kernel.jar:?]
    at com.liferay.portal.kernel.portlet.bridges.mvc.MVCPortlet.doDispatch(MVCPortlet.java:509) ~[portal-kernel.jar:?]
    at javax.portlet.GenericPortlet.render(GenericPortlet.java:291) ~[portlet.jar:3.0.1]
    at com.liferay.portal.kernel.portlet.bridges.mvc.MVCPortlet.render(MVCPortlet.java:309) ~[portal-kernel.jar:?]
    at com.liferay.portlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:127) ~[portal-impl.jar:?]
    at com.liferay.portlet.ScriptDataPortletFilter.doFilter(ScriptDataPortletFilter.java:58) ~[portal-impl.jar:?]
    at com.liferay.portlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:124) ~[portal-impl.jar:?]
    at com.liferay.portal.kernel.portlet.PortletFilterUtil.doFilter(PortletFilterUtil.java:71) ~[portal-kernel.jar:?]
    at com.liferay.portal.kernel.servlet.PortletServlet.service(PortletServlet.java:115) ~[portal-kernel.jar:?]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:764) ~[servlet-api.jar:4.0.FR]
    at org.eclipse.equinox.http.servlet.internal.registration.EndpointRegistration.service(EndpointRegistration.java:153) ~[?:?]
    at org.eclipse.equinox.http.servlet.internal.servlet.ResponseStateHandler.processRequest(ResponseStateHandler.java:62) ~[?:?]
    at org.eclipse.equinox.http.servlet.internal.context.DispatchTargets.doDispatch(DispatchTargets.java:120) ~[?:?]
    at org.eclipse.equinox.http.servlet.internal.servlet.RequestDispatcherAdaptor.include(RequestDispatcherAdaptor.java:48) ~[?:?]
    at com.liferay.portlet.internal.InvokerPortletImpl.invoke(InvokerPortletImpl.java:570) ~[portal-impl.jar:?]
    at com.liferay.portlet.internal.InvokerPortletImpl.invokeRender(InvokerPortletImpl.java:660) ~[portal-impl.jar:?]
    at com.liferay.portlet.internal.InvokerPortletImpl.render(InvokerPortletImpl.java:345) ~[portal-impl.jar:?]
    at com.liferay.portal.monitoring.internal.portlet.MonitoringInvokerPortlet.lambda$render$0(MonitoringInvokerPortlet.java:259) ~[?:?]
    at com.liferay.portal.monitoring.internal.portlet.MonitoringInvokerPortlet._render(MonitoringInvokerPortlet.java:363) ~[?:?] 

，所以我不知道我的问题在哪里，以及如何确保新数据库已连接到我的项目。 PS：我的Liferay版本是7.4.3

Answer 1

您需要将两个服务构建器罐（API和服务实现）部署到Liferay，以便在运行时可用于Portlet。在Compiltime，Maven在.m2文件夹中找到了它们（仅需要API），但是在运行时，Liferay不知道检查该位置 - 但事实并非如此。

正如您所说，您是Liferay的初学者：我将从Liferay的标准依赖注入（例如OSGI）（或“ DS”，正如声明性服务在Service.xml声明中调用），而不是将Spring添加到游戏。添加Spring 可能会使您的情况变得复杂。我强烈建议您先了解服务构建器，然后再增加更复杂的性能。