RE: RE: call service builder's service by portlet on liferay 7.4.2 ga3

2021-10-15T00:50:39Z

hi Olaf

thank you for your reply, thank you.

i am very sure CI-DS:CI-DS-api and CI-DS:CI-DS-service are both deploied, if not, my portlet cannot deploy success due to the build.gradle have note it.

happy to know @Reference way is right, and also LocalServiceUtil not wrong.

persaonly, i prefeir LocalServiceUtil way more for 3 reasons.

1. all dao's naming principle will looks consistent

2. i don't like too many global variable, it's not, but looks like.

3. i have only use api in build.gradle if i choose localserviceutil.

in this case, it is a service-builder connect to exteronal database(oracle) with DataSourceProvider, all document and artical use @Reference.

i will keep tring, i will use gogo-shell to trace it first.

again, thank you. and if you have any suggestion, please please let me know.

RE: call service builder's service by portlet on liferay 7.4.2 ga3

2021-10-14T08:35:24Z

If your portlet doesn't show in the list, you might want to check if it deploys at all. Best to use Gogo Shell's diagnostic commands, or just try to start it and interpret the error message if one appears.

Note: The way you describe using @Reference is the correct one. It hints at your service being unavailable - e.g. you'll also need to deploy CI-DS:CI-DS-api and CI-DS:CI-DS-service to the runtime environment. Otherwise the reference can't be resolved. Using the static Util class hides this fact and defers to a runtime error message, but it's preferable to get this error message before a component is actually in use.

call service builder's service by portlet on liferay 7.4.2 ga3

2021-10-18T19:26:46Z

i am using liferay ce 7.4.2 ga3 with mysql and jdk8

all just downloaded from downloads

all good, but when i try use my service(build by service-builder),

   public void testExtDB(ActionRequest actionRequest, ActionResponse actionResponse)
           throws PortletException, IOException {
       ItemLocalServiceUtil.testUtil();
   }

i got exception

2021-10-13 06:08:27.953 ERROR [http-nio-8080-exec-10][PortletServlet:119] javax.portlet.PortletException: java.lang.NullPointerException
javax.portlet.PortletException: java.lang.NullPointerException
   at com.liferay.portal.kernel.portlet.LiferayPortlet.callActionMethod(LiferayPortlet.java:205) ~[portal-kernel.jar:?]
   at com.liferay.portal.kernel.portlet.bridges.mvc.MVCPortlet.callActionMethod(MVCPortlet.java:394) ~[portal-kernel.jar:?]
   at com.liferay.portal.kernel.portlet.LiferayPortlet.processAction(LiferayPortlet.java:88) ~[portal-kernel.jar:?]
   at com.liferay.portal.kernel.portlet.bridges.mvc.MVCPortlet.processAction(MVCPortlet.java:247) ~[portal-kernel.jar:?]
   at com.liferay.portlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:77) ~[portal-impl.jar:?]
   at com.liferay.portal.kernel.portlet.PortletFilterUtil.doFilter(PortletFilterUtil.java:50) ~[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:733) ~[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:63) ~[?:?]
   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:569) ~[portal-impl.jar:?]
   at com.liferay.portlet.internal.InvokerPortletImpl.invokeAction(InvokerPortletImpl.java:609) ~[portal-impl.jar:?]
   at com.liferay.portlet.internal.InvokerPortletImpl.processAction(InvokerPortletImpl.java:286) ~[portal-impl.jar:?]
   at com.liferay.portal.monitoring.internal.portlet.MonitoringInvokerPortlet.processAction(MonitoringInvokerPortlet.java:195) ~[?:?]
   at com.liferay.portlet.internal.PortletContainerImpl._processAction(PortletContainerImpl.java:517) ~[portal-impl.jar:?]
   at com.liferay.portlet.internal.PortletContainerImpl.lambda$processAction$0(PortletContainerImpl.java:148) ~[portal-impl.jar:?]
   at com.liferay.portlet.internal.PortletContainerImpl._preserveGroupIds(PortletContainerImpl.java:421) [portal-impl.jar:?]
   at com.liferay.portlet.internal.PortletContainerImpl.processAction(PortletContainerImpl.java:141) [portal-impl.jar:?]
   at com.liferay.portlet.SecurityPortletContainerWrapper.processAction(SecurityPortletContainerWrapper.java:92) [portal-impl.jar:?]
   at com.liferay.portlet.RestrictPortletContainerWrapper.processAction(RestrictPortletContainerWrapper.java:72) [portal-impl.jar:?]
   at com.liferay.portal.kernel.portlet.PortletContainerUtil.processAction(PortletContainerUtil.java:117) [portal-kernel.jar:?]
   at com.liferay.portal.action.LayoutAction.processLayout(LayoutAction.java:368) [portal-impl.jar:?]
   at com.liferay.portal.action.LayoutAction.execute(LayoutAction.java:174) [portal-impl.jar:?]
   at com.liferay.portal.struts.PortalRequestProcessor._process(PortalRequestProcessor.java:401) [portal-impl.jar:?]
   at com.liferay.portal.struts.PortalRequestProcessor.process(PortalRequestProcessor.java:151) [portal-impl.jar:?]
   at com.liferay.portal.internal.servlet.MainServlet.doPost(MainServlet.java:213) [portal-impl.jar:?]
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:652) [servlet-api.jar:4.0.FR]
   at com.liferay.portal.internal.servlet.MainServlet.service(MainServlet.java:632) [portal-impl.jar:?]
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:733) [servlet-api.jar:4.0.FR]
   at com.liferay.shielded.container.internal.proxy.ServletWrapper.service(ServletWrapper.java:113) [com.liferay.shielded.container.impl.jar:?]
   at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:227) [catalina.jar:9.0.43]
   at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) [catalina.jar:9.0.43]
   at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) [tomcat-websocket.jar:9.0.43]
   at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) [catalina.jar:9.0.43]
   at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) [catalina.jar:9.0.43]
   at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:124) [portal-kernel.jar:?]
   at com.liferay.portal.remote.cors.internal.servlet.filter.PortalCORSServletFilter.processFilter(PortalCORSServletFilter.java:237) [bundleFile:?]
   at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:49) [portal-kernel.jar:?]
   at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:215) [portal-kernel.jar:?]
   at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116) [portal-kernel.jar:?]
   at com.liferay.portal.servlet.filters.password.modified.PasswordModifiedFilter.processFilter(PasswordModifiedFilter.java:62) [portal-impl.jar:?]
   at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:49) [portal-kernel.jar:?]
   at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:215) [portal-kernel.jar:?]
   at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116) [portal-kernel.jar:?]
   at com.liferay.portal.servlet.filters.lockout.LockoutFilter.processFilter(LockoutFilter.java:58) [portal-impl.jar:?]
   at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:49) [portal-kernel.jar:?]
   at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:215) [portal-kernel.jar:?]
   at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116) [portal-kernel.jar:?]
   at com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:147) [portal-kernel.jar:?]
   at com.liferay.portal.servlet.filters.secure.BaseAuthFilter.processFilter(BaseAuthFilter.java:339) [portal-impl.jar:?]
   at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:49) [portal-kernel.jar:?]
   at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:215) [portal-kernel.jar:?]
   at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116) [portal-kernel.jar:?]
   at com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:147) [portal-kernel.jar:?]
   at com.liferay.portal.monitoring.internal.servlet.filter.MonitoringFilter.processFilter(MonitoringFilter.java:183) [bundleFile:?]
   at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:49) [portal-kernel.jar:?]
   at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:215) [portal-kernel.jar:?]
   at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116) [portal-kernel.jar:?]
   at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilter.doFilter(InvokerFilter.java:104) [portal-kernel.jar:?]
   at com.liferay.shielded.container.internal.proxy.FilterWrapper.doFilter(FilterWrapper.java:79) [com.liferay.shielded.container.impl.jar:?]
   at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) [catalina.jar:9.0.43]
   at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) [catalina.jar:9.0.43]
   at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:710) [catalina.jar:9.0.43]
   at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:457) [catalina.jar:9.0.43]
   at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:384) [catalina.jar:9.0.43]
   at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:312) [catalina.jar:9.0.43]
   at com.liferay.friendly.url.internal.servlet.FriendlyURLServlet.service(FriendlyURLServlet.java:455) [bundleFile:?]
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:733) [servlet-api.jar:4.0.FR]
   at com.liferay.portal.servlet.ServletAdapter.service(ServletAdapter.java:99) [portal-impl.jar:?]
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:733) [servlet-api.jar:4.0.FR]
   at com.liferay.shielded.container.internal.proxy.ServletWrapper.service(ServletWrapper.java:113) [com.liferay.shielded.container.impl.jar:?]
   at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:227) [catalina.jar:9.0.43]
   at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) [catalina.jar:9.0.43]
   at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) [tomcat-websocket.jar:9.0.43]
   at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) [catalina.jar:9.0.43]
   at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) [catalina.jar:9.0.43]
   at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:124) [portal-kernel.jar:?]
   at com.liferay.portal.remote.cors.internal.servlet.filter.PortalCORSServletFilter.processFilter(PortalCORSServletFilter.java:237) [bundleFile:?]
   at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:49) [portal-kernel.jar:?]
   at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:215) [portal-kernel.jar:?]
   at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116) [portal-kernel.jar:?]
   at com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:147) [portal-kernel.jar:?]
   at com.liferay.portal.servlet.filters.i18n.I18nFilter.processFilter(I18nFilter.java:368) [portal-impl.jar:?]
   at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:49) [portal-kernel.jar:?]
   at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:215) [portal-kernel.jar:?]
   at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116) [portal-kernel.jar:?]
   at com.liferay.portal.servlet.filters.password.modified.PasswordModifiedFilter.processFilter(PasswordModifiedFilter.java:62) [portal-impl.jar:?]
   at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:49) [portal-kernel.jar:?]
   at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:215) [portal-kernel.jar:?]
   at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116) [portal-kernel.jar:?]
   at com.liferay.portal.servlet.filters.lockout.LockoutFilter.processFilter(LockoutFilter.java:58) [portal-impl.jar:?]
   at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:49) [portal-kernel.jar:?]
   at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:215) [portal-kernel.jar:?]
   at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116) [portal-kernel.jar:?]
   at com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:147) [portal-kernel.jar:?]
   at com.liferay.portal.servlet.filters.secure.BaseAuthFilter.processFilter(BaseAuthFilter.java:339) [portal-impl.jar:?]
   at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:49) [portal-kernel.jar:?]
   at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:215) [portal-kernel.jar:?]
   at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116) [portal-kernel.jar:?]
   at com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:147) [portal-kernel.jar:?]
   at com.liferay.portal.servlet.filters.autologin.AutoLoginFilter.processFilter(AutoLoginFilter.java:265) [portal-impl.jar:?]
   at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:49) [portal-kernel.jar:?]
   at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:215) [portal-kernel.jar:?]
   at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116) [portal-kernel.jar:?]
   at com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:147) [portal-kernel.jar:?]
   at com.liferay.portal.sharepoint.SharepointFilter.processFilter(SharepointFilter.java:88) [portal-impl.jar:?]
   at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:49) [portal-kernel.jar:?]
   at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:215) [portal-kernel.jar:?]
   at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116) [portal-kernel.jar:?]
   at com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:147) [portal-kernel.jar:?]
   at com.liferay.portal.servlet.filters.virtualhost.VirtualHostFilter.processFilter(VirtualHostFilter.java:245) [portal-impl.jar:?]
   at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:49) [portal-kernel.jar:?]
   at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:215) [portal-kernel.jar:?]
   at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116) [portal-kernel.jar:?]
   at com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:147) [portal-kernel.jar:?]
   at com.liferay.portal.monitoring.internal.servlet.filter.MonitoringFilter.processFilter(MonitoringFilter.java:183) [bundleFile:?]
   at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:49) [portal-kernel.jar:?]
   at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:215) [portal-kernel.jar:?]
   at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116) [portal-kernel.jar:?]
   at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDirectCallFilter(InvokerFilterChain.java:196) [portal-kernel.jar:?]
   at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:99) [portal-kernel.jar:?]
   at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDirectCallFilter(InvokerFilterChain.java:196) [portal-kernel.jar:?]
   at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:99) [portal-kernel.jar:?]
   at org.tuckey.web.filters.urlrewrite.RuleChain.handleRewrite(RuleChain.java:176) [urlrewritefilter.jar:4.0.4]
   at org.tuckey.web.filters.urlrewrite.RuleChain.doRules(RuleChain.java:145) [urlrewritefilter.jar:4.0.4]
   at org.tuckey.web.filters.urlrewrite.UrlRewriter.processRequest(UrlRewriter.java:92) [urlrewritefilter.jar:4.0.4]
   at org.tuckey.web.filters.urlrewrite.UrlRewriteFilter.doFilter(UrlRewriteFilter.java:389) [urlrewritefilter.jar:4.0.4]
   at com.liferay.portal.servlet.filters.urlrewrite.UrlRewriteFilter.processFilter(UrlRewriteFilter.java:65) [portal-impl.jar:?]
   at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:49) [portal-kernel.jar:?]
   at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:215) [portal-kernel.jar:?]
   at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116) [portal-kernel.jar:?]
   at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDirectCallFilter(InvokerFilterChain.java:175) [portal-kernel.jar:?]
   at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:99) [portal-kernel.jar:?]
   at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDirectCallFilter(InvokerFilterChain.java:175) [portal-kernel.jar:?]
   at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:99) [portal-kernel.jar:?]
   at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDirectCallFilter(InvokerFilterChain.java:196) [portal-kernel.jar:?]
   at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:99) [portal-kernel.jar:?]
   at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilter.doFilter(InvokerFilter.java:104) [portal-kernel.jar:?]
   at com.liferay.shielded.container.internal.proxy.FilterWrapper.doFilter(FilterWrapper.java:79) [com.liferay.shielded.container.impl.jar:?]
   at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) [catalina.jar:9.0.43]
   at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) [catalina.jar:9.0.43]
   at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) [catalina.jar:9.0.43]
   at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97) [catalina.jar:9.0.43]
   at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:542) [catalina.jar:9.0.43]
   at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:143) [catalina.jar:9.0.43]
   at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) [catalina.jar:9.0.43]
   at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78) [catalina.jar:9.0.43]
   at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:346) [catalina.jar:9.0.43]
   at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:374) [tomcat-coyote.jar:9.0.43]
   at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) [tomcat-coyote.jar:9.0.43]
   at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:887) [tomcat-coyote.jar:9.0.43]
   at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1684) [tomcat-coyote.jar:9.0.43]
   at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-coyote.jar:9.0.43]
   at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_271]
   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_271]
   at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-util.jar:9.0.43]
   at java.lang.Thread.run(Thread.java:748) [?:1.8.0_271]
Caused by: java.lang.NullPointerException
   at com.raritan.ci.ds.plm.service.ItemLocalServiceUtil.testUtil(ItemLocalServiceUtil.java:278) ~[bundleFile:?]
   at com.raritan.ci.amd.portlet.AdminMasterDataPortlet.testExtDB(AdminMasterDataPortlet.java:97) ~[bundleFile:?]
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_271]
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_271]
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_271]
   at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_271]
   at com.liferay.portal.kernel.portlet.LiferayPortlet.callActionMethod(LiferayPortlet.java:183) ~[portal-kernel.jar:?]
   ... 158 more

i try use annotation

@Reference
ItemLocalService _itemLocalService;

and

   public void testExtDB(ActionRequest actionRequest, ActionResponse actionResponse)
           throws PortletException, IOException {
       _itemLocalService.testUtil();
   }

my portlet won't show in Weiget list.

and if i remove the annotation "@Reference", i got same exception.

my build.gradle of my portlet is

dependencies {
   compileOnly group: "com.liferay.portal", name: "release.portal.api"

   cssBuilder group: "com.liferay", name: "com.liferay.css.builder", version: "3.0.2"

   compileOnly project(":modules:CI-DS:CI-DS-api")
   compileOnly project(":modules:CI-DS:CI-DS-service")
}

i want to know,

1. how to make portlet visable when using @Reference, what's i doing wrong?

2. i always use LocalServiceUtil to use my service(service builder) since 6.2, what's different between LocalServiceUtil and annotation? when i should use one and when i should use the other?

3. do i need add message in guild.gradle's dependencies? like

compileOnly group: "org.osgi", name:"org.osgi.service.component.annotations"

my gradle info is

Working Directory: C:\LiferayWorkspacewithDevStudio-20211013\liferay-workspace\modules\CI-DS-PLM\CI-DS-PLM-service
Gradle user home: C:\Users\vic\.gradle
Gradle Distribution: Gradle wrapper from target build
Gradle Version: 6.6.1
Java Home: C:\Program Files\Java\jdk1.8.0_271
JVM Arguments: None
Program Arguments: None
Build Scans Enabled: false
Offline Mode Enabled: false
Gradle Tasks: buildService

thank you