本文介绍了Cometd Oort群集-Spring集成的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
在尝试将spring与cometd oort集群集成时获得空指针异常：
<servlet>
<servlet-name>cometd</servlet-name>
<servlet-class>org.cometd.server.CometdServlet</servlet-class>
<init-param>
<param-name>transports</param-name>
<param-value>org.cometd.websocket.server.WebSocketTransport</param-value>
</init-param>
<async-supported>true</async-supported>
</servlet>
<servlet-mapping>
<servlet-name>cometd</servlet-name>
<url-pattern>/cometd/*</url-pattern>
</servlet-mapping>
在互联网上找到此信息
：如果您使用Spring来配置CometD对象，那么您不得使用
配置servlet，例如OortMulticastConfigServlet。
您所有的配置都属于Spring，并且您需要在
初始化程序中进行所有操作。
Found this information on internet :If you use Spring to configure CometD objects, then you must not useconfiguration servlets such as OortMulticastConfigServlet.All your configuration belongs to Spring and you do everything in theinitializer.
<!--
<servlet>
<servlet-name>oort</servlet-name>
<servlet-class>org.cometd.oort.OortStaticConfigServlet</servlet-class>
<init-param>
<param-name>oort.url</param-name>
<param-value>http://10.30.3.106:9080/project/cometd</param-value>
</init-param>
<init-param>
<param-name>oort.cloud</param-name>
<param-value>http://10.30.1.112:8080/project/cometd</param-value>
</init-param>
</servlet> -->
<servlet>
<servlet-name>seti</servlet-name>
<servlet-class>org.cometd.oort.SetiServlet</servlet-class>
</servlet>
与Spring竞争集成：
Cometd Integration with Spring :
package com.efacec.oms.powr.cometd;
import javax.annotation.PostConstruct;
import javax.inject.Inject;
import javax.inject.Singleton;
import javax.servlet.ServletContext;
import org.apache.log4j.Logger;
import org.cometd.annotation.ServerAnnotationProcessor;
import org.cometd.bayeux.server.BayeuxServer;
import org.cometd.oort.Oort;
import org.cometd.oort.Seti;
import org.cometd.server.BayeuxServerImpl;
import org.cometd.server.ext.TimesyncExtension;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.config.DestructionAwareBeanPostProcessor;
import org.springframework.context.annotation.Bean;
import org.springframework.stereotype.Component;
import org.springframework.web.context.ServletContextAware;
@Component
@Singleton
public class Configurer implements DestructionAwareBeanPostProcessor, ServletContextAware
{
private BayeuxServer bayeuxServer;
private ServerAnnotationProcessor processor;
private Oort oort;
private Seti seti;
private Logger logger = Logger.getLogger(this.getClass());
@Autowired
BayeuxAuthenticator bayeuxAuthenticator;
@Inject
private void setBayeuxServer(BayeuxServer bayeuxServer)
{
this.bayeuxServer = bayeuxServer;
this.bayeuxServer.addExtension(new TimesyncExtension());
// BayeuxAuthenticator authenticator = new BayeuxAuthenticator();
this.bayeuxServer.setSecurityPolicy(bayeuxAuthenticator);
}
@PostConstruct
public void init()
{
this.processor = new ServerAnnotationProcessor(bayeuxServer);
}
public Object postProcessBeforeInitialization(Object bean, String name) throws BeansException
{
processor.processDependencies(bean);
processor.processConfigurations(bean);
processor.processCallbacks(bean);
return bean;
}
public Object postProcessAfterInitialization(Object bean, String name) throws BeansException
{
return bean;
}
public void postProcessBeforeDestruction(Object bean, String name) throws BeansException
{
processor.deprocessCallbacks(bean);
}
@Bean(initMethod = "start", destroyMethod = "stop")
public BayeuxServer bayeuxServer()
{
BayeuxServerImpl bean = new BayeuxServerImpl();
bean.setOption(BayeuxServerImpl.LOG_LEVEL, "3");
// bean.setOption(BayeuxServerImpl., "3");
return bean;
}
@Bean(name="oort", initMethod = "start", destroyMethod="stop")
public Oort oort()
{
oort = new Oort(this.bayeuxServer,"oortion");
//Using bayeuxServer(), throw null pointer exception
return oort;
}
@Bean(name="seti", initMethod = "start", destroyMethod="stop")
public Seti seti(){
Seti seti = new Seti(oort);
return seti;
}
public void setServletContext(ServletContext servletContext)
{
servletContext.setAttribute(BayeuxServer.ATTRIBUTE, bayeuxServer);
// servletContext.setAttribute(Seti.SETI_ATTRIBUTE, seti);
// servletContext.setAttribute(Oort.OORT_ATTRIBUTE, oort);
}
}
无法关联userId与会话。
seti.associate（loginUserId，serverSession）;
无法在安全策略中注入Seti和OOrt。
Cannot associate userId with session.seti.associate(loginUserId, serverSession);Cannot Inject Seti and OOrt in Security policy.
package com.efacec.oms.powr.cometd;
import java.util.HashMap;
import java.util.Map;
import javax.inject.Inject;
import javax.inject.Singleton;
import javax.servlet.ServletContext;
import org.apache.commons.lang.StringUtils;
import org.apache.log4j.Logger;
import org.cometd.bayeux.server.BayeuxServer;
import org.cometd.bayeux.server.ServerMessage;
import org.cometd.bayeux.server.ServerSession;
import org.cometd.oort.Oort;
import org.cometd.oort.OortComet;
import org.cometd.oort.Seti;
import org.cometd.server.DefaultSecurityPolicy;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.stereotype.Component;
import org.springframework.web.context.ServletContextAware;
@Component
@Singleton
public class BayeuxAuthenticator extends DefaultSecurityPolicy implements ServerSession.RemoveListener // (1)
{
private Seti seti;
private Oort oort;
private Logger logger = Logger.getLogger(this.getClass());
@Autowired
public void setSeti(Seti seti) {
this.seti = seti;
}
@Autowired
public void setOort(Oort oort) {
this.oort = oort;
}
@Override
public boolean canHandshake(BayeuxServer server, ServerSession serverSession, ServerMessage message) //(2)
{
if (serverSession.isLocalSession()) //(3)
return true;
// Remote Oort comets are allowed to handshake
/* if (oort.isOortHandshake(message))
return true;
*/
Map<String, Object> ext = message.getExt();
if (ext == null)
return false;
@SuppressWarnings("unchecked")
Map<String, Object> authentication = (Map<String, Object>)ext.get("authentication");
if (authentication == null)
return false;
Object user=authentication.get("user");
String loginUserId=user.toString();
boolean user_is_number=StringUtils.isNumeric(loginUserId) ? true:false;
seti.associate(loginUserId, serverSession);
serverSession.addListener(this); // (6)
return true;
}
else
{
logger.debug("Authentication Failure !! ::"+serverSession.getId());
serverSession.addListener(this); // (6)
return false;
}
}
public void removed(ServerSession remote, boolean expired) // (7)
{
}
}
错误消息：
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'configurer': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: com.efacec.oms.powr.cometd.BayeuxAuthenticator com.efacec.oms.powr.cometd.Configurer.bayeuxAuthenticator; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'bayeuxAuthenticator': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire method: public void com.efacec.oms.powr.cometd.BayeuxAuthenticator.setSeti(org.cometd.oort.Seti); nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'seti' defined in class path resource [com/efacec/oms/powr/cometd/Configurer.class]: Instantiation of bean failed; nested exception is org.springframework.beans.factory.BeanDefinitionStoreException: Factory method [public org.cometd.oort.Seti com.efacec.oms.powr.cometd.Configurer.seti()] threw exception; nested exception is java.lang.NullPointerException
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:292)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1185)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:475)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:304)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:300)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:200)
at org.springframework.context.support.PostProcessorRegistrationDelegate.registerBeanPostProcessors(PostProcessorRegistrationDelegate.java:232)
at org.springframework.context.support.AbstractApplicationContext.registerBeanPostProcessors(AbstractApplicationContext.java:618)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:467)
at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:403)
at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:306)
at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:106)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4992)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5490)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1575)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1565)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
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:662)
Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: com.efacec.oms.powr.cometd.BayeuxAuthenticator com.efacec.oms.powr.cometd.Configurer.bayeuxAuthenticator; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'bayeuxAuthenticator': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire method: public void com.efacec.oms.powr.cometd.BayeuxAuthenticator.setSeti(org.cometd.oort.Seti); nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'seti' defined in class path resource [com/efacec/oms/powr/cometd/Configurer.class]: Instantiation of bean failed; nested exception is org.springframework.beans.factory.BeanDefinitionStoreException: Factory method [public org.cometd.oort.Seti com.efacec.oms.powr.cometd.Configurer.seti()] threw exception; nested exception is java.lang.NullPointerException
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:508)
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:87)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:289)
... 23 more
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'bayeuxAuthenticator': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire method: public void com.efacec.oms.powr.cometd.BayeuxAuthenticator.setSeti(org.cometd.oort.Seti); nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'seti' defined in class path resource [com/efacec/oms/powr/cometd/Configurer.class]: Instantiation of bean failed; nested exception is org.springframework.beans.factory.BeanDefinitionStoreException: Factory method [public org.cometd.oort.Seti com.efacec.oms.powr.cometd.Configurer.seti()] threw exception; nested exception is java.lang.NullPointerException
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:292)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1185)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:475)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:304)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:300)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:195)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.findAutowireCandidates(DefaultListableBeanFactory.java:1017)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:960)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:858)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:480)
... 25 more
Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire method: public void com.efacec.oms.powr.cometd.BayeuxAuthenticator.setSeti(org.cometd.oort.Seti); nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'seti' defined in class path resource [com/efacec/oms/powr/cometd/Configurer.class]: Instantiation of bean failed; nested exception is org.springframework.beans.factory.BeanDefinitionStoreException: Factory method [public org.cometd.oort.Seti com.efacec.oms.powr.cometd.Configurer.seti()] threw exception; nested exception is java.lang.NullPointerException
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredMethodElement.inject(AutowiredAnnotationBeanPostProcessor.java:596)
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:87)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:289)
... 36 more
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'seti' defined in class path resource [com/efacec/oms/powr/cometd/Configurer.class]: Instantiation of bean failed; nested exception is org.springframework.beans.factory.BeanDefinitionStoreException: Factory method [public org.cometd.oort.Seti com.efacec.oms.powr.cometd.Configurer.seti()] threw exception; nested exception is java.lang.NullPointerException
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:597)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1094)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:989)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:504)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:475)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:304)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:300)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:195)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.findAutowireCandidates(DefaultListableBeanFactory.java:1017)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:960)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:858)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredMethodElement.inject(AutowiredAnnotationBeanPostProcessor.java:553)
... 38 more
Caused by: org.springframework.beans.factory.BeanDefinitionStoreException: Factory method [public org.cometd.oort.Seti com.efacec.oms.powr.cometd.Configurer.seti()] threw exception; nested exception is java.lang.NullPointerException
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:188)
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:586)
... 50 more
**Caused by: java.lang.NullPointerException
at org.cometd.oort.Seti.<init>(Seti.java:82)
at com.efacec.oms.powr.cometd.Configurer.seti(Configurer.java:100)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at** org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:166)
... 51 more
推荐答案
我添加了使用Spring注释配置奥尔特和 Seti 。
I have added an example on how to configure Oort and Seti using Spring annotations.
关于您的问题：
-
NullPointerException是由于以下事实Configurer类上的方法将以您不希望的顺序被调用。顺便说一句，Configurer应该用Spring的@Configuration注释，而不是@Component 。 code>（）。
The
NullPointerExceptionis due to the fact that methods on yourConfigurerclass are called in an order that you don't expect. By the way,Configurershould be annotated with Spring's@Configurationrather than@Component(COMETD-547).
SetiServlet 是 Seti 的配置Servlet，因此，如果使用在春季，您应该在春季而不是在 web.xml 中配置 Seti 。
SetiServlet is the configuration Servlet for Seti, so if you configure CometD using Spring, you should configure Seti in Spring, not in web.xml.
将奥尔特和 Seti 设置为 ServletContext 属性。在Spring配置中，这是一个简单的衬里，并允许您与使用这些属性的代码完全兼容。
Setting Oort and Seti as ServletContext attribute is strongly recommended. It's a simple one liner in the Spring configuration, and allows you for full compatibility with code that uses those attributes.
按照我上面链接的示例，一切都应该很好。
Follow the example I linked above, and everything should be good.
这篇关于Cometd Oort群集-Spring集成的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！