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刚完成Struts的Virgo插件，分享一下设计思路和Virgo OSGi内部的独特机制

    博客分类：
  • osgi
osgi virgo struts felix 
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2014-3-13：因有很多网友有类似的问题，我把我的代码放到sourceforge里了，网址如下：

https://sourceforge.net/projects/s4vp/

-----------------------------------------------------------

首先说一下此插件的功能：使用此插件可以在有一个主Struts Bundle的前提下，编写其他附属struts bundle，他们的Struts配置信息可以共享，而内部JSP等文件的定位是独立的。

 

可能目前人们对OSGi的关注度不高，Virgo的可能更少，要不然Spring也不会捐出去，但我相信OSGi也将是一个趋势，比如anroid的低层容器就是通过OSGi实现的。

 

在选择OSGi容器的时候，我本来是想用felix的，因为Struts2官方的OSGi的插件是使用felix的，但存在一些缺点：

 

  • 只能用Struts的2.1.8.1的版本，和felix的1.X.X版本（Felix都到4了好不好）
  • 不支持默认的JSP result，只支持freemark和velocity
  • 在tomcat的容器上再创建OSGi容器，在性能上肯定有所损失
  • 无法在主web context和其bundle里共享spring的配置信息（我是在配置Spring Security时发现的）
  • 最严重的是Struts项目对OSGi的投入力度太少，热情不高，我在apache官网提了一个BUG，居然要到下一个大版本才给发布。。。

 

后来，我就想直接使用Spring的OSGi容器，不过已经捐给Eclipse了，也就是Virgo。当然virgo也有缺点，就是没有支持的struts插件，这也是我不得不花很时间写此插件的原因。

 

我的设计思路主要参照Struts的OSGi插件和Virgo的snap插件。其中使用struts-osgi插件主要实现Struts的配置OSGi化。而virgo-snap主要实现JSP等文件的定位问题。

 

配置的OSGi化：通过修改原Struts的配置来实现的。

实现要点：（大家可以对照Struts-osgi插件的实现）

 

  • 增加struts-plugin.xml配置文件，将其在META-INF中export出去，主struts bundle会自动加载此配置文件

  • 配置文件中ObjectFactory,PackageProvider,ClassloaderInterface需要重新实现

  • PackageProvider中主要是加入对附属Struts bundle的过滤，找到之后就加载bundle内的struts.xml配置文件，使之与主bundle的配置合并。然后就是对之后容器内的bundle进行监听，新增bundle就添加，停用的bundle就删除

  • ObjectFactory中主要是加入对无法找到的类，重新定位到当前附属bundle内查找实现

  • 获取当前附属bundle的方法是，在加载package的配置时，记录package name与bundle的对应关系，然后在之后查询是，通过ActionContext间接获取当前的Action所属的package name,再对应其bundle就OK了

  • ClassloaderInterface与上面的原理差不多就不多说了

  • 还有就是Freemark,Velocity和其他静态资源的访问定位，差不多都是通过修改内容文件的入口点至当前bundle就行，具体可以看原Struts-osgi插件的实现

 

bundel内文件的定位：通过更改ServletContext来编译jsp来实现的。

实现要点：（大家可以对照Virgo-Snaps插件的实现）

 

 

  • 因tomcat最终定位JSP文件位置的地方是在ServletContext内，而ServletContext的实现只能通过容器来获取。最终实现是通过监听和搜索主Struts bundle发布的ServletContext服务得到的。

  • JSP的编译用的是原tomcat内的JspServlet类，可以直接实例化，然后wrapper下容器ServletContext，改变其获取资源的方式，用其对servlet进行init，然后这个servlet就可以编译jsp了

  • 其中JspServlet的初始化时所使用的classloader一定要改成附属bundle的Classloader，而这个classloader还必须是WebBundleClassLoader，所以必须将附属bundle通过virgo的 Transformer 进行转化，而classloader可以通过Spring进来的WebBundleClassLoaderFactory进行创建

    要注意的是web bundle默认的classpath的路径为"WEB-INF/classes"，如果你的JSP文件是想放在根目录就必须添加"."到classpath中

    相关代码：
    @Override
    public void transform(GraphNode<InstallArtifact> installGraph, InstallEnvironment installEnvironment) throws DeploymentException {
        installGraph.visit(new ExceptionThrowingDirectedAcyclicGraphVisitor<InstallArtifact, DeploymentException>() {

            public boolean visit(GraphNode<InstallArtifact> node) throws DeploymentException {
                InstallArtifact installArtifact = node.getValue();
                if (OsgiUtil.isNeedStrutsVirgoSupport(installArtifact)) {
                    BundleManifest bundleManifest = OsgiUtil.getBundleManifest((BundleInstallArtifact) installArtifact);
                    doTransform(bundleManifest, getSourceUrl(installArtifact));
                }
                return true;
            }
        });
    }
    
    void doTransform(BundleManifest bundleManifest, URL sourceUrl) throws DeploymentException {
        logger.info("Transforming bundle at '{}'", sourceUrl.toExternalForm());
        
        try {
            bundleManifest.setModuleType(STRUTS_MODULE_TYPE);
            bundleManifest.setHeader("SpringSource-DefaultWABHeaders", "true");
            bundleManifest.setHeader(Constants.BUNDLE_CLASSPATH, ".");
            InstallationOptions installationOptions = installOptionFactory.createDefaultInstallOptions();
            this.manifestTransformer.transform(bundleManifest, sourceUrl, installationOptions, false);
        } catch (IOException ioe) {
            logger.error(String.format("Error transforming manifest for struts '%s' version '%s'",
                bundleManifest.getBundleSymbolicName().getSymbolicName(), bundleManifest.getBundleVersion()), ioe);
            throw new DeploymentException("Error transforming manifest for struts '" + bundleManifest.getBundleSymbolicName().getSymbolicName()
                + "' version '" + bundleManifest.getBundleVersion() + "'", ioe);
        }
    }
     
    Transformer的实现类需要通过spring配置文件进行声明：
    <osgi:reference id="webBundleManifestTransformer" interface="org.eclipse.gemini.web.core.WebBundleManifestTransformer"/>
<osgi:reference id="webBundleClassLoaderFactory" interface="org.eclipse.gemini.web.tomcat.spi.WebBundleClassLoaderFactory"/>
<osgi:reference id="eventLogger" interface="org.eclipse.virgo.medic.eventlog.EventLogger"/>
	
<osgi:service ref="lifecycleListener" interface="org.eclipse.virgo.kernel.install.artifact.InstallArtifactLifecycleListener"/>
	
<osgi:service ref="transformer" interface="org.eclipse.virgo.kernel.install.pipeline.stage.transform.Transformer" ranking="1500"/>
     

            <bean id="lifecycleListener" class="org.apache.struts2.osgi.virgo.internal.deployer.StrutsLifecycleListener">
		<constructor-arg ref="webBundleClassLoaderFactory"/>
		<constructor-arg ref="eventLogger"/>
	</bean>
	
	<bean id="transformer" class="org.apache.struts2.osgi.virgo.internal.deployer.StrutsVirgoTransformer">
		<constructor-arg ref="webBundleManifestTransformer"/>
	</bean>
		

	<bean id="strutsFactoryMonitor" class="org.apache.struts2.osgi.virgo.internal.StrutsFactoryMonitor" init-method="start" destroy-method="stop">
		<constructor-arg ref="bundleContext"/>
		<constructor-arg ref="eventLogger"/>
	</bean>
      

  • 下面要解决的问题是主Struts bundle和附属Struts bundle之间如何进行信息传递的问题。这个问题的产生原因是，我们监听事件的bundle是我们的插件， 而不是主bundle。

    如果你要问，为什么不通过主Struts bundle来实现此功能。那么我的回答是：当然可以，不过你要把class文件放到你的主struts bundle内。也就是说class文件在哪个bundle内，哪么这个类的实现就在哪个bundle的领空内，这个你无法改变，因为这个是virgo内部的classloader机制的基础。

    解决问题的方法是通过我们的插件来传递信息，传递的方向是：附属bundle -> 插件 ->主bundle。之所以是这个方向，是因为主bundle才是外界访问的接口。

    传递信息前需要做的一件事情是：收集信息。

    · 首先通过Virgo的InstallArtifactLifecycleListenerSupport，在附属bundle在安装时，动态添加一个StrutsFactory服务，里面包含重要的classloader等信息
    · 然后插件在factorymonitor里监听这个服务，收到信息后，通过查找对应的主bundle来创建struts实例，并动态添加为服务
    · 最后主bundle通过监听这个服务，获取struts类，而struts类里包含编译jsp文件的所有功能

    所以我们可以通过添加一个简单的filter，将jsp文件通过struts来进行解析编译，就OK了



    代码如下：
    final class StrutsLifecycleListener extends InstallArtifactLifecycleListenerSupport {

    private final Logger logger = LoggerFactory.getLogger(this.getClass());

    private final Map<InstallArtifact, ServiceRegistrationTracker> registrationTrackers = new ConcurrentHashMap<InstallArtifact, ServiceRegistrationTracker>();

    private final WebBundleClassLoaderFactory classLoaderFactory;

    private final EventLogger eventLogger;

    public StrutsLifecycleListener(WebBundleClassLoaderFactory classLoaderFactory, EventLogger eventLogger) {
        this.classLoaderFactory = classLoaderFactory;
        this.eventLogger = eventLogger;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void onStarted(InstallArtifact installArtifact) throws DeploymentException {
        if (OsgiUtil.isNeedStrutsVirgoSupport(installArtifact)) {
            Bundle bundle = ((BundleInstallArtifact) installArtifact).getBundle();
            BundleManifest bundleManifest = OsgiUtil.getBundleManifest((BundleInstallArtifact) installArtifact);

            ServiceRegistration<StrutsFactory> registration = createAndRegisterStrutsFactoryService(bundle, bundleManifest);

            ServiceRegistrationTracker registrationTracker = new ServiceRegistrationTracker();
            registrationTracker.track(registration);

            this.registrationTrackers.put(installArtifact, registrationTracker);
        }
    }

    ServiceRegistration<StrutsFactory> createAndRegisterStrutsFactoryService(Bundle bundle, BundleManifest bundleManifest) {
        logger.info("Creating a StrutsFactory for bundle '{}'", bundle);
        StrutsFactory strutsFactory = new WebAppStrutsFactory(bundle, this.classLoaderFactory, this.eventLogger);

        StrutsHostDefinition hostDefinition = OsgiUtil.getStrutsHostHeader(bundleManifest);

        Dictionary<String, String> serviceProperties= new Hashtable<String, String>();
        serviceProperties.put(Scope.PROPERTY_SERVICE_SCOPE, Scope.SCOPE_ID_GLOBAL); // expose service outside any containing scope
        serviceProperties.put(StrutsFactory.FACTORY_NAME_PROPERTY, hostDefinition.getSymbolicName());
        serviceProperties.put(StrutsFactory.FACTORY_RANGE_PROPERTY, hostDefinition.getVersionRange().toParseString());

        ServiceRegistration<StrutsFactory> registration = bundle.getBundleContext().registerService(StrutsFactory.class, strutsFactory, serviceProperties);
        return registration;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void onStopping(InstallArtifact installArtifact) {
        logger.info("Destroying StrutsFactory for bundle '{}'", installArtifact.getName());
        ServiceRegistrationTracker serviceRegistrationTracker = this.registrationTrackers.remove(installArtifact);
        if (serviceRegistrationTracker != null) {
            serviceRegistrationTracker.unregisterAll();
        }
    }
    
}
     
    当然也需要spring配置文件的声明，之前的代码已经贴出来了。

    因为附属bundle的ServletContext需要transform的转换，所以我们不能同时获取，因此，我们需要先发布下StrutsFacotry服务，言外之意是我已经收集好前面的信息了；然后通过监听此服务，当收到信息时再监听ServletContext服务，来收集全部信息。
    代码如下：
    package org.apache.struts2.osgi.virgo.internal;

import java.util.Collection;
import java.util.Dictionary;
import java.util.HashSet;
import java.util.Hashtable;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;

import org.apache.struts2.osgi.virgo.internal.deployer.StrutsFactory;
import org.eclipse.virgo.medic.eventlog.EventLogger;
import org.eclipse.virgo.util.osgi.ServiceRegistrationTracker;
import org.osgi.framework.Bundle;
import org.osgi.framework.BundleContext;
import org.osgi.framework.Constants;
import org.osgi.framework.InvalidSyntaxException;
import org.osgi.framework.ServiceEvent;
import org.osgi.framework.ServiceListener;
import org.osgi.framework.ServiceReference;
import org.osgi.framework.ServiceRegistration;
import org.osgi.util.tracker.ServiceTracker;
import org.osgi.util.tracker.ServiceTrackerCustomizer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public final class StrutsFactoryMonitor implements ServiceTrackerCustomizer<StrutsFactory, Object> {
	public final static String KEY_HOST_ID = "struts.host.id";
	public final static String KEY_CONTEXT_PATH = "struts.context.path";
	public final static String KEY_NAME = "struts.name";
	
	
	private final Logger logger = LoggerFactory.getLogger(this.getClass());

	private final BundleContext bundleContext;
	private final ServiceTracker<StrutsFactory, Object> strutsFactoryTracker;
	private final EventLogger eventLogger;

	public StrutsFactoryMonitor(BundleContext bundleContext, EventLogger eventLogger) {
		this.bundleContext = bundleContext;
		this.strutsFactoryTracker = new ServiceTracker<StrutsFactory, Object>(bundleContext, StrutsFactory.class, this);
		this.eventLogger = eventLogger;
	}

	public void start() {
		this.strutsFactoryTracker.open();
	}

	public void stop() {
		this.strutsFactoryTracker.close();
	}

	public Object addingService(ServiceReference<StrutsFactory> reference) {
		StrutsFactory strutsFactory = this.bundleContext.getService(reference);
		if (strutsFactory != null) {
			BundleContext strutsBundleContext = reference.getBundle().getBundleContext();
			StrutsBinder strutsBinder = new StrutsBinder(strutsBundleContext, strutsFactory,
					StrutsHostDefinition.fromServiceReference(reference), this.eventLogger);
			strutsBinder.start();
			return strutsBinder;
		}
		logger.warn("Unable to create StrutsBinder due to missing StrutsFactory");
		return null;
	}

	public void modifiedService(ServiceReference<StrutsFactory> reference, Object service) {
	}

	public void removedService(ServiceReference<StrutsFactory> reference, Object service) {
		logger.info("Destroying StrutsBinder for bundle '{}'", reference.getBundle());
		((StrutsBinder) service).destroy();
	}

	private static enum StrutsLifecycleState {
		AWAITING_INIT, INIT_SUCCEEDED, INIT_FAILED
	}

	private static final class StrutsBinder implements ServiceListener {
		private static final String SNAP_ORDER = "struts.order";
		private final Logger logger = LoggerFactory.getLogger(this.getClass());

		private final BundleContext context;
		private final HostSelector hostSelector;
		private final Object hostStateMonitor = new Object();
		private final Object strutsStateMonitor = new Object();
		private boolean queriedInitialHosts = false;
		private ServiceReference<ServletContext> hostReference;
		private final ServiceRegistrationTracker registrationTracker = new ServiceRegistrationTracker();
		private final EventLogger eventLogger;
		private Struts struts;
		private final StrutsFactory factory;

		public StrutsBinder(final BundleContext context, final StrutsFactory strutsFactory, final StrutsHostDefinition hostDefinition,
				final EventLogger eventLogger) {
			this.context = context;
			this.hostSelector = new HostSelector(hostDefinition, (String) context.getBundle().getHeaders().get("Module-Scope"));
			this.eventLogger = eventLogger;
			this.factory = strutsFactory;
		}

		private void start() {
			registerHostListener();
		}

		private void registerHostListener() {
			try {
				this.context.addServiceListener(this, "(objectClass=javax.servlet.ServletContext)");
				logger.info("Listening for hosts to be registered.");
				searchForExistingHost();
			} catch (InvalidSyntaxException e) {
				logger.error("Filter syntax invalid");
			}
		}

		private void hostPublished(ServiceReference<ServletContext> hostReference) {
			assert (!Thread.holdsLock(this.hostStateMonitor));

			ServletContext servletContext = this.context.getService(hostReference);
			if (servletContext != null) {
				synchronized (this.hostStateMonitor) {
					Collection<ServiceReference<ServletContext>> references = new HashSet<ServiceReference<ServletContext>>();
					references.add(hostReference);
					ServiceReference<ServletContext> matchedHost = this.hostSelector.selectHost(references);

					if (matchedHost == null) {
						logger.info("Host {} did not match {} ", hostReference.getBundle().getSymbolicName(), this.hostSelector.getHostDefinition().toString());
						return;
					}
				}

				Bundle hostBundle = hostReference.getBundle();

				StrutsLifecycleState newState = StrutsLifecycleState.INIT_FAILED;

				Struts struts = this.factory.createStruts(new Host(hostBundle, servletContext));
				try {
					logger.info("Initializing struts '{}'", struts.getContextPath());
					struts.init();

					newState = StrutsLifecycleState.INIT_SUCCEEDED;

					logger.info("Publishing struts '{}'", struts.getContextPath());
					publishStrutsService(struts, hostBundle);

				} catch (ServletException e) {
					this.eventLogger.log(StrutsLogEvents.STRUTS_INIT_FAILURE,
							servletContext.getContextPath() + " --> " + struts.getContextPath(), e.getMessage());
				} finally {
					synchronized (this.strutsStateMonitor) {
						if (newState == StrutsLifecycleState.INIT_SUCCEEDED) {
							this.struts = struts;
						}
					}
				}
			}
		}

		private void publishStrutsService(Struts struts, Bundle hostBundle) {
			Hashtable<Object, Object> props = struts.getStrutsProperties();
			Dictionary<String, Object> serviceProperties = new Hashtable<String, Object>();

			for (Object key : props.keySet()) {
				serviceProperties.put(key.toString(), props.get(key));
			}

			String strutsOrder = (String) serviceProperties.get(SNAP_ORDER);
			if (strutsOrder != null) {
				serviceProperties.put(Constants.SERVICE_RANKING, Integer.parseInt(strutsOrder));
			}
			serviceProperties.put(KEY_HOST_ID, Long.toString(hostBundle.getBundleId()));
			serviceProperties.put(KEY_CONTEXT_PATH, struts.getContextPath());
			serviceProperties.put(KEY_NAME, (String) this.context.getBundle().getHeaders().get("Bundle-Name"));

			ServiceRegistration<Struts> registration = this.context.registerService(Struts.class, struts, serviceProperties);
			this.registrationTracker.track(registration);
			logger.info("Published struts service for '{}'", struts.getContextPath());
		}

		private void destroy() {
			try {
				destroyStruts();
			} finally {
				unregisterHostListener();
			}
		}

		private void unregisterHostListener() {
			logger.info("No longer listening for hosts to be registered.");
			this.context.removeServiceListener(this);
		}

		public void serviceChanged(ServiceEvent event) {
			synchronized (this.hostStateMonitor) {
				while (!queriedInitialHosts) {
					try {
						this.hostStateMonitor.wait();
					} catch (InterruptedException e) {
						Thread.currentThread().interrupt();
					}
				}
			}

			int type = event.getType();
			@SuppressWarnings("unchecked")
			ServiceReference<ServletContext> serviceReference = (ServiceReference<ServletContext>) event.getServiceReference();

			if (type == ServiceEvent.REGISTERED && this.hostReference == null) {
				hostPublished(serviceReference);
			} else if (type == ServiceEvent.UNREGISTERING) {
				if (serviceReference.equals(this.hostReference)) {
					hostRetracted(serviceReference);
				}
			}
		}

		private void hostRetracted(ServiceReference<ServletContext> serviceReference) {
			try {
				destroyStruts();
			} finally {
				synchronized (this.hostStateMonitor) {
					this.hostReference = null;
				}
			}
		}

		private void destroyStruts() {
			Struts s = null;
			synchronized (this.strutsStateMonitor) {
				s = this.struts;
				this.struts = null;
			}
			this.registrationTracker.unregisterAll();
			if (s != null) {
				logger.info("Retracted struts service for '{}'", s.getContextPath());
				s.destroy();
			}
		}

		private void searchForExistingHost() {
			ServiceReference<ServletContext> existingHost = null;
			Collection<ServiceReference<ServletContext>> candidates = findHostCandidiates();
			if (candidates != null && !candidates.isEmpty()) {
				logger.info("{} host candidates found", candidates.size());
			} else {
				logger.info("No host candidates found");
			}

			synchronized (this.hostStateMonitor) {
				try {
					existingHost = this.hostSelector.selectHost(candidates);
					this.queriedInitialHosts = true;
				} finally {
					this.hostStateMonitor.notifyAll();
				}
			}
			if (existingHost != null) {
				hostPublished(existingHost);
			}
		}

		private Collection<ServiceReference<ServletContext>> findHostCandidiates() {
			try {
				return this.context.getServiceReferences(ServletContext.class, null);
			} catch (InvalidSyntaxException ise) {
				throw new IllegalStateException("Unexpected invalid filter syntax with null filter", ise);
			}
		}
	}
}
     关于spring配置的问题同上就不再多说了。

    Struts类的关键代码
     /**
     * {@inheritDoc}
     * 
     * @throws ServletException
     */
    public final void init() throws ServletException {
        logger.info("Initializing struts '{}'", this.strutsBundle.getSymbolicName());
        StrutsServletContext servletContext = new StrutsServletContext(this.host.getServletContext(), this.strutsBundle);
        servletContext.setAttribute(WebContainer.ATTRIBUTE_BUNDLE_CONTEXT, this.strutsBundle.getBundleContext());

        this.strutsClassLoader = this.classLoaderFactory.createWebBundleClassLoader(this.strutsBundle);

        try {
            ((Lifecycle) strutsClassLoader).start();
        } catch (LifecycleException e) {
            logger.error("Failed to start struts's class loader", e);
            throw new ServletException("Failed to start web bundle's class loader", e);
        }
        
        this.initServlet(servletContext);

        this.eventLogger.log(StrutsLogEvents.STRUTS_BOUND, this.strutsBundle.getSymbolicName());
    }
    
    private final void initServlet(final StrutsServletContext servletContext) throws ServletException {
    	try {
            ManagerUtils.doWithThreadContextClassLoader(this.strutsClassLoader, new ClassLoaderCallback<Void>() {
                public Void doWithClassLoader() throws ServletException {
                	try {
						WebAppStruts.this.servlet = (Servlet)SERVLET_CLASS.newInstance();
					} catch (Exception e) {
						throw new ServletException("Create Servlet Fail", e);
					}
                	
                	ImmutableServletConfig servletConfig = new ImmutableServletConfig(servletContext);
                	WebAppStruts.this.servlet.init(servletConfig);
                	
                    return null;
                }
            });
        } catch (IOException e) {
            logger.error("Unexpected IOException from servlet init", e);
            throw new ServletException("Unexpected IOException from servlet init", e);
        }
    }

    /**
     * {@inheritDoc}
     */
    public final void destroy() {
        ClassLoader strutsClassLoader = this.strutsClassLoader;

        if (strutsClassLoader != null) {
            try {
                ((Lifecycle) strutsClassLoader).stop();
            } catch (LifecycleException e) {
                logger.error("Failed to stop struts's class loader", e);
                throw new StrutsException("Failed to stop web bundle class loader", e);
            }
        } else {
            // TODO Log warning that class loader was null during destroy
        }
        this.eventLogger.log(StrutsLogEvents.STRUTS_UNBOUND, this.strutsBundle.getSymbolicName());
    }

    /**
     * {@inheritDoc}
     */
    public final void handleRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        if (servlet != null) {
        	servlet.service(request, response);
        } else {
            // TODO Log warning that dispatcher is not present
            throw new ServletException("handleRequest invoked when virtual container was null");
        }
    }
     

 

先说这么多，没有将全部代码放出来，主要是因为刚刚实现我想要的功能，细节地方和测试工作还没有完善，放出来也是不能直接使用的东西，就不误导大家了。而写这篇文章，主要是在写代码的过程中一直在摸索，写完了没有整体的理解，这次也算是给自己一次沉淀的过程，也希望能给使用virgo的同学一点可以参考的资料，毕竟国内关于virgo的资料太少了。

最后有什么问题还请大家拍砖

 

 

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评论
3 楼 snoopy7713 2014-03-14  
[2014-03-14 17:55:06.651]  TCP Connection(2)-127.0.0.1 <DE0002E> Installation of bundle 'org.apache.struts.struts2-virgo-plugin' version '1.0.0' failed. org.eclipse.virgo.nano.serviceability.Assert$FatalAssertionException: input packageImports must not contain duplicate items
at org.eclipse.virgo.nano.serviceability.Assert.isNull(Assert.java:103)
at org.eclipse.virgo.kernel.userregion.internal.importexpansion.AbstractTrackedPackageImports.convertImportedPackageListToMap(AbstractTrackedPackageImports.java:323)
at org.eclipse.virgo.kernel.userregion.internal.importexpansion.BundleTrackedPackageImports.getInitialImportedPackages(BundleTrackedPackageImports.java:58)
at org.eclipse.virgo.kernel.userregion.internal.importexpansion.BundleTrackedPackageImports.<init>(BundleTrackedPackageImports.java:43)
at org.eclipse.virgo.kernel.userregion.internal.importexpansion.StandardTrackedPackageImportsFactory.create(StandardTrackedPackageImportsFactory.java:37)
at org.eclipse.virgo.kernel.userregion.internal.importexpansion.ImportExpansionHandler.mergeImports(ImportExpansionHandler.java:161)
at org.eclipse.virgo.kernel.userregion.internal.importexpansion.ImportExpansionHandler.mergePromotedImports(ImportExpansionHandler.java:152)
at org.eclipse.virgo.kernel.userregion.internal.importexpansion.ImportExpansionHandler.mergePromotedImports(ImportExpansionHandler.java:145)
at org.eclipse.virgo.kernel.userregion.internal.importexpansion.ImportExpansionHandler.expandImports(ImportExpansionHandler.java:122)
at sun.reflect.GeneratedMethodAccessor61.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:318)
at org.eclipse.gemini.blueprint.service.importer.support.internal.aop.ServiceInvoker.doInvoke(ServiceInvoker.java:56)
at org.eclipse.gemini.blueprint.service.importer.support.internal.aop.ServiceInvoker.invoke(ServiceInvoker.java:60)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:131)
at org.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:119)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.eclipse.gemini.blueprint.service.util.internal.aop.ServiceTCCLInterceptor.invokeUnprivileged(ServiceTCCLInterceptor.java:70)
at org.eclipse.gemini.blueprint.service.util.internal.aop.ServiceTCCLInterceptor.invoke(ServiceTCCLInterceptor.java:53)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.eclipse.gemini.blueprint.service.importer.support.LocalBundleContextAdvice.invoke(LocalBundleContextAdvice.java:57)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:131)
at org.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:119)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
at com.sun.proxy.$Proxy42.expandImports(Unknown Source)
at org.eclipse.virgo.kernel.deployer.core.internal.ImportExpandingTransformer.expandImports(ImportExpandingTransformer.java:107)
at org.eclipse.virgo.kernel.deployer.core.internal.ImportExpandingTransformer$ImportExpandingGraphVisitor.visit(ImportExpandingTransformer.java:80)
at org.eclipse.virgo.util.common.ThreadSafeGraphNode.visitInternal(ThreadSafeGraphNode.java:193)
at org.eclipse.virgo.util.common.ThreadSafeGraphNode.visit(ThreadSafeGraphNode.java:184)
at org.eclipse.virgo.kernel.deployer.core.internal.ImportExpandingTransformer.transform(ImportExpandingTransformer.java:58)
at org.eclipse.virgo.kernel.install.pipeline.stage.transform.internal.TransformationStage.doProcessGraph(TransformationStage.java:54)
at org.eclipse.virgo.kernel.install.pipeline.stage.AbstractPipelineStage.process(AbstractPipelineStage.java:41)
at org.eclipse.virgo.kernel.install.pipeline.internal.StandardPipeline.doProcessGraph(StandardPipeline.java:62)
at org.eclipse.virgo.kernel.install.pipeline.internal.CompensatingPipeline.doProcessGraph(CompensatingPipeline.java:73)
at org.eclipse.virgo.kernel.install.pipeline.stage.AbstractPipelineStage.process(AbstractPipelineStage.java:41)
at org.eclipse.virgo.kernel.install.pipeline.internal.StandardPipeline.doProcessGraph(StandardPipeline.java:62)
at org.eclipse.virgo.kernel.install.pipeline.stage.AbstractPipelineStage.process(AbstractPipelineStage.java:41)
at org.eclipse.virgo.kernel.deployer.core.internal.PipelinedApplicationDeployer.driveInstallPipeline(PipelinedApplicationDeployer.java:359)
at org.eclipse.virgo.kernel.deployer.core.internal.PipelinedApplicationDeployer.doInstall(PipelinedApplicationDeployer.java:185)
at org.eclipse.virgo.kernel.deployer.core.internal.PipelinedApplicationDeployer.install(PipelinedApplicationDeployer.java:140)
at org.eclipse.virgo.kernel.deployer.core.internal.PipelinedApplicationDeployer.deploy(PipelinedApplicationDeployer.java:253)
at org.eclipse.virgo.kernel.deployer.management.StandardDeployer.deploy(StandardDeployer.java:52)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:75)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:279)
at com.sun.jmx.mbeanserver.ConvertingMethod.invokeWithOpenReturn(ConvertingMethod.java:193)
at com.sun.jmx.mbeanserver.ConvertingMethod.invokeWithOpenReturn(ConvertingMethod.java:175)
at com.sun.jmx.mbeanserver.MXBeanIntrospector.invokeM2(MXBeanIntrospector.java:117)
at com.sun.jmx.mbeanserver.MXBeanIntrospector.invokeM2(MXBeanIntrospector.java:54)
at com.sun.jmx.mbeanserver.MBeanIntrospector.invokeM(MBeanIntrospector.java:237)
at com.sun.jmx.mbeanserver.PerInterface.invoke(PerInterface.java:138)
at com.sun.jmx.mbeanserver.MBeanSupport.invoke(MBeanSupport.java:252)
at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)
at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)
at javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1487)
at javax.management.remote.rmi.RMIConnectionImpl.access$300(RMIConnectionImpl.java:97)
at javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1328)
at javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1420)
at javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:848)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:322)
at sun.rmi.transport.Transport$1.run(Transport.java:177)
at sun.rmi.transport.Transport$1.run(Transport.java:174)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Transport.java:173)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:556)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:811)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:670)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:744)
2 楼 snoopy7713 2014-03-13  
需要看一下，你的代码说的挺模糊的。我的联系方式QQ 16200780
1 楼 huangcanqin 2013-03-17  
不知道你现在struts 有没有整合成功？我按照你的思路还是出现一些bug：
Exception starting filter struts2 java.lang.NoClassDefFoundError: Could not initialize class com.opensymphony.xwork2.util.DomHelper$DOMBuilder
at com.opensymphony.xwork2.util.DomHelper.parse(DomHelper.java:107)
at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.loadConfigurationFiles(XmlConfigurationProvider.java:904)
at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.loadDocuments(XmlConfigurationProvider.java:154)
at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.init(XmlConfigurationProvider.java:121)
at com.opensymphony.xwork2.config.impl.DefaultConfiguration.reloadContainer(DefaultConfiguration.java:179)
at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:66)
at org.apache.struts2.dispatcher.Dispatcher.init_PreloadConfiguration(Dispatcher.java:380)
at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:424)
at org.apache.struts2.dispatcher.ng.InitOperations.initDispatcher(InitOperations.java:69)
at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.init(StrutsPrepareAndExecuteFilter.java:51)
at org.apache.catalina.core.ApplicationFilterConfig.initFilter(ApplicationFilterConfig.java:277)
at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:258)
at org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:382)
at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:103)
at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4638)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5294)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:895)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:871)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:615)
at org.eclipse.gemini.web.tomcat.internal.TomcatServletContainer.startWebApplication(TomcatServletContainer.java:125)
at org.eclipse.gemini.web.internal.StandardWebApplication.start(StandardWebApplication.java:95)
at org.eclipse.virgo.web.core.internal.WebBundleLifecycleListener.onStarted(WebBundleLifecycleListener.java:122)
at org.eclipse.virgo.kernel.install.artifact.internal.StandardArtifactStateMonitor.onStarted(StandardArtifactStateMonitor.java:271)
at org.eclipse.virgo.kernel.install.artifact.internal.AbstractInstallArtifact.asyncStartSucceeded(AbstractInstallArtifact.java:319)
at org.eclipse.virgo.kernel.install.artifact.internal.AbstractInstallArtifact.access$0(AbstractInstallArtifact.java:316)
at org.eclipse.virgo.kernel.install.artifact.internal.AbstractInstallArtifact$StateMonitorSignal.signalSuccessfulCompletion(AbstractInstallArtifact.java:252)
at org.eclipse.virgo.kernel.core.internal.BundleStartTracker$1.run(BundleStartTracker.java:140)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)
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