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我在从 Spring MVC portlet 访问服务（通过服务构建器模块项目生成）时遇到问题，我阅读了论坛链接https://dev.liferay.com/develop/tutorials/-/knowledge_base/7-0/service-trackers并尝试使用 Service Tracker 从 Controller 访问服务。

这是 SpringTestPortletViewController.java

@Controller
@RequestMapping("VIEW")
public class SpringTestPortletViewController {

    private FooServiceTracker fooServiceTracker;
    @PostConstruct 
    public void init(){
         fooServiceTracker=new FooServiceTracker(this); 
         fooServiceTracker.open(); 
    }
    @PreDestroy public void destroy(){ 
         fooServiceTracker.close(); 
    }

    @RenderMapping
    public String question(Model model) {
        try {
            if(!fooServiceTracker.isEmpty()){
                FooLocalService fooLocalService=fooServiceTracker.getService();
                fooLocalService.saveFoo(); 
                System.out.println("----" + FooLocalServiceUtil.getFoosCount());
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return "SpringTest/view";
    }
}

FooServiceTracker.java

public class FooServiceTracker extends ServiceTracker<FooLocalService,FooLocalService>{

    public FooServiceTracker(Object host){
        super(FrameworkUtil.getBundle(host.getClass()).getBundleContext(), FooLocalService.class, null);
    }
}

在部署 Spring MVC Portlet 期间面临以下问题。它无法获取捆绑包，即FrameworkUtil.getBundle(SpringTestPortletViewController.getClass()) 即将为空

11:49:48,432 INFO  [Refresh Thread: Equinox Container: 6095db50-baf9-0016-1a03-97f126c9b821][PortletHotDeployListener:202] Registering portlets for SpringTest-portlet
11:49:48,649 ERROR [Refresh Thread: Equinox Container: 6095db50-baf9-0016-1a03-97f126c9b821][DispatcherPortlet:279] Context initialization failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'springTestPortletViewController': Invocation of init method failed; nested exception is java.lang.NullPointerException
    at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeInitialization(InitDestroyAnnotationBeanPostProcessor.java:136)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:408)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1570)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:545)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:772)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:839)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:538)
    at org.springframework.web.portlet.FrameworkPortlet.createPortletApplicationContext(FrameworkPortlet.java:368)
    at org.springframework.web.portlet.FrameworkPortlet.initPortletApplicationContext(FrameworkPortlet.java:297)
    at org.springframework.web.portlet.FrameworkPortlet.initPortletBean(FrameworkPortlet.java:271)
    at org.springframework.web.portlet.GenericPortletBean.init(GenericPortletBean.java:124)
    at javax.portlet.GenericPortlet.init(GenericPortlet.java:136)
    at com.liferay.portlet.InvokerPortletImpl.init(InvokerPortletImpl.java:296)
    at com.liferay.portlet.PortletInstanceFactoryImpl.init(PortletInstanceFactoryImpl.java:294)
    at com.liferay.portlet.PortletInstanceFactoryImpl.create(PortletInstanceFactoryImpl.java:193)
    at com.liferay.portal.kernel.portlet.PortletInstanceFactoryUtil.create(PortletInstanceFactoryUtil.java:49)
    at com.liferay.portlet.PortletBagFactory.create(PortletBagFactory.java:217)
    at com.liferay.portal.service.impl.PortletLocalServiceImpl.initWAR(PortletLocalServiceImpl.java:858)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at com.liferay.portal.spring.aop.ServiceBeanMethodInvocation.proceed(ServiceBeanMethodInvocation.java:153)
    at com.liferay.portal.spring.aop.ServiceBeanAopProxy.invoke(ServiceBeanAopProxy.java:174)
    at com.sun.proxy.$Proxy123.initWAR(Unknown Source)
    at com.liferay.portal.kernel.service.PortletLocalServiceUtil.initWAR(PortletLocalServiceUtil.java:327)
    at com.liferay.portal.deploy.hot.PortletHotDeployListener.doInvokeDeploy(PortletHotDeployListener.java:210)
    at com.liferay.portal.deploy.hot.PortletHotDeployListener.invokeDeploy(PortletHotDeployListener.java:95)
    at com.liferay.portal.deploy.hot.HotDeployImpl.doFireDeployEvent(HotDeployImpl.java:237)
    at com.liferay.portal.deploy.hot.HotDeployImpl.fireDeployEvent(HotDeployImpl.java:104)
    at com.liferay.portal.kernel.deploy.hot.HotDeployUtil.fireDeployEvent(HotDeployUtil.java:28)
    at com.liferay.portal.kernel.servlet.PluginContextListener.fireDeployEvent(PluginContextListener.java:164)
    at com.liferay.portal.kernel.servlet.PluginContextListener.doPortalInit(PluginContextListener.java:154)
    at com.liferay.portal.kernel.util.BasePortalLifecycle.portalInit(BasePortalLifecycle.java:44)
    at com.liferay.portal.kernel.util.PortalLifecycleUtil.register(PortalLifecycleUtil.java:74)
    at com.liferay.portal.kernel.util.PortalLifecycleUtil.register(PortalLifecycleUtil.java:58)
    at com.liferay.portal.kernel.util.BasePortalLifecycle.registerPortalLifecycle(BasePortalLifecycle.java:54)
    at com.liferay.portal.kernel.servlet.PluginContextListener.contextInitialized(PluginContextListener.java:116)
    at com.liferay.portal.kernel.servlet.SecurePluginContextListener.contextInitialized(SecurePluginContextListener.java:151)
    at com.liferay.portal.osgi.web.wab.extender.internal.adapter.ServletContextListenerExceptionAdapter.contextInitialized(ServletContextListenerExceptionAdapter.java:51)
    at sun.reflect.GeneratedMethodAccessor487.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.eclipse.equinox.http.servlet.internal.registration.ListenerRegistration$EventListenerInvocationHandler.invoke(ListenerRegistration.java:132)
    at com.sun.proxy.$Proxy491.contextInitialized(Unknown Source)
    at org.eclipse.equinox.http.servlet.internal.context.ContextController.doAddListenerRegistration(ContextController.java:359)
    at org.eclipse.equinox.http.servlet.internal.context.ContextController.addListenerRegistration(ContextController.java:312)
    at org.eclipse.equinox.http.servlet.internal.customizer.ContextListenerTrackerCustomizer.addingService(ContextListenerTrackerCustomizer.java:67)
    at org.eclipse.equinox.http.servlet.internal.customizer.ContextListenerTrackerCustomizer.addingService(ContextListenerTrackerCustomizer.java:1)
    at org.osgi.util.tracker.ServiceTracker$Tracked.customizerAdding(ServiceTracker.java:941)
    at org.osgi.util.tracker.ServiceTracker$Tracked.customizerAdding(ServiceTracker.java:1)
    at org.osgi.util.tracker.AbstractTracked.trackAdding(AbstractTracked.java:256)
    at org.osgi.util.tracker.AbstractTracked.track(AbstractTracked.java:229)
    at org.osgi.util.tracker.ServiceTracker$Tracked.serviceChanged(ServiceTracker.java:901)
    at org.eclipse.osgi.internal.serviceregistry.FilteredServiceListener.serviceChanged(FilteredServiceListener.java:109)
    at org.eclipse.osgi.internal.framework.BundleContextImpl.dispatchEvent(BundleContextImpl.java:917)
    at org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:230)
    at org.eclipse.osgi.framework.eventmgr.ListenerQueue.dispatchEventSynchronous(ListenerQueue.java:148)
    at org.eclipse.osgi.internal.serviceregistry.ServiceRegistry.publishServiceEventPrivileged(ServiceRegistry.java:862)
    at org.eclipse.osgi.internal.serviceregistry.ServiceRegistry.publishServiceEvent(ServiceRegistry.java:801)
    at org.eclipse.osgi.internal.serviceregistry.ServiceRegistrationImpl.register(ServiceRegistrationImpl.java:127)
    at org.eclipse.osgi.internal.serviceregistry.ServiceRegistry.registerService(ServiceRegistry.java:225)
    at org.eclipse.osgi.internal.framework.BundleContextImpl.registerService(BundleContextImpl.java:464)
    at org.eclipse.osgi.internal.framework.BundleContextImpl.registerService(BundleContextImpl.java:482)
    at org.eclipse.osgi.internal.framework.BundleContextImpl.registerService(BundleContextImpl.java:1001)
    at com.liferay.portal.osgi.web.wab.extender.internal.WabBundleProcessor.initListeners(WabBundleProcessor.java:526)
    at com.liferay.portal.osgi.web.wab.extender.internal.WabBundleProcessor.init(WabBundleProcessor.java:153)
    at com.liferay.portal.osgi.web.wab.extender.internal.WebBundleDeployer._initWabBundle(WebBundleDeployer.java:186)
    at com.liferay.portal.osgi.web.wab.extender.internal.WebBundleDeployer.doStart(WebBundleDeployer.java:106)
    at com.liferay.portal.osgi.web.wab.extender.internal.WabFactory$WABExtension.start(WabFactory.java:163)
    at org.apache.felix.utils.extender.AbstractExtender.createExtension(AbstractExtender.java:259)
    at org.apache.felix.utils.extender.AbstractExtender.modifiedBundle(AbstractExtender.java:232)
    at org.osgi.util.tracker.BundleTracker$Tracked.customizerModified(BundleTracker.java:482)
    at org.osgi.util.tracker.BundleTracker$Tracked.customizerModified(BundleTracker.java:1)
    at org.osgi.util.tracker.AbstractTracked.track(AbstractTracked.java:232)
    at org.osgi.util.tracker.BundleTracker$Tracked.bundleChanged(BundleTracker.java:444)
    at org.eclipse.osgi.internal.framework.BundleContextImpl.dispatchEvent(BundleContextImpl.java:905)
    at org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:230)
    at org.eclipse.osgi.framework.eventmgr.ListenerQueue.dispatchEventSynchronous(ListenerQueue.java:148)
    at org.eclipse.osgi.internal.framework.EquinoxEventPublisher.publishBundleEventPrivileged(EquinoxEventPublisher.java:165)
    at org.eclipse.osgi.internal.framework.EquinoxEventPublisher.publishBundleEvent(EquinoxEventPublisher.java:75)
    at org.eclipse.osgi.internal.framework.EquinoxEventPublisher.publishBundleEvent(EquinoxEventPublisher.java:67)
    at org.eclipse.osgi.internal.framework.EquinoxContainerAdaptor.publishModuleEvent(EquinoxContainerAdaptor.java:102)
    at org.eclipse.osgi.container.Module.publishEvent(Module.java:461)
    at org.eclipse.osgi.container.Module.start(Module.java:452)
    at org.eclipse.osgi.framework.util.SecureAction.start(SecureAction.java:454)
    at org.eclipse.osgi.container.ModuleContainer.applyDelta(ModuleContainer.java:717)
    at org.eclipse.osgi.container.ModuleContainer.resolveAndApply(ModuleContainer.java:491)
    at org.eclipse.osgi.container.ModuleContainer.resolve(ModuleContainer.java:437)
    at org.eclipse.osgi.container.ModuleContainer.refresh(ModuleContainer.java:955)
    at org.eclipse.osgi.container.ModuleContainer$ContainerWiring.dispatchEvent(ModuleContainer.java:1336)
    at org.eclipse.osgi.container.ModuleContainer$ContainerWiring.dispatchEvent(ModuleContainer.java:1)
    at org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:230)
    at org.eclipse.osgi.framework.eventmgr.EventManager$EventThread.run(EventManager.java:340)
Caused by: java.lang.NullPointerException
    at com.service.tracker.FooServiceTracker.<init>(FooServiceTracker.java:11)
    at SpringTest.SpringTestPortletViewController.init(SpringTestPortletViewController.java:43)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleElement.invoke(InitDestroyAnnotationBeanPostProcessor.java:354)
    at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleMetadata.invokeInitMethods(InitDestroyAnnotationBeanPostProcessor.java:305)
    at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeInitialization(InitDestroyAnnotationBeanPostProcessor.java:133)
    ... 98 more

在这里欣赏一些输入，

4

3 回答 3

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FrameworkworkUtil implementation relies on OSGI runtime to load the classes. I believe your class was not loaded by an OSGi bundle classloader, instead its on a AppClassLoader. The getBundle returns only the classes loaded via OSGI classloader and thus its returning NULL. Please refer to org.osgi.framework.launch.FrameworkFactory docs to know more about configuring the OSGI runtime.

于 2017-02-23T17:53:11.597 回答
0

根据我的经验，我遵循的一般做法是在 tomcat/lib/ 下维护通用服务构建器 jar，例如自定义用户服务等，并将特定于 portlet 的服务构建器 jar 保存在 portlet 的 WEB-INF/lib/ 下。此外，如果需要共享构建器 jar，仍将它们放在 portlet WEB-INF/lib 下，并用于required-deployment-contexts在不同的 portlet 上下文中引用 jar。

于 2017-02-24T17:23:35.897 回答
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我在 tomcat/lib/ext 中移动了服务构建器模块 api jar 重新启动了服务器，然后访问了它工作的 Spring MVC portlet 中的 Util 类。但是这里需要一些指导以获得最佳实践，以处理 Spring MVC portlet 中服务构建器模块 jar 的这种依赖关系？

于 2017-02-24T13:08:15.307 回答