常见问题

1、CSE服务拉起过程中，只打印了部分日志，没有什么异常信息
原因：Spring初始化过程中主线程被阻塞，导致整个初始化都卡住了，可以使用jstack查看线程

2、

2018-06-26 17:04:49,082 [WARN] Exception encountered during context initialization - cancelling refresh 
attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.apache.servicecomb.config.ConfigurationSpringInitializer#0' defined in URL [jar:file:/D:/Maven/repository/org/apache/servicecomb/foundation-config/1.0.0.B013/foundation-config-1.0.0.B013.jar!/META-INF/spring/cse.bean.xml]: Initialization of bean failed; nested exception is java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.String org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:551)
Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.apache.servicecomb.config.ConfigurationSpringInitializer#0' defined in URL [jar:file:/D:/Maven/repository/org/apache/servicecomb/foundation-config/1.0.0.B013/foundation-config-1.0.0.B013.jar!/META-INF/spring/cse.bean.xml]: Initialization of bean failed; nested exception is java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.String
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:564)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:312)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:308)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202)
    at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:151)
    at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:687)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:525)
    at org.springframework.context.support.ClassPathXmlApplicationContext.(ClassPathXmlApplicationContext.java:139)
    at org.springframework.context.support.ClassPathXmlApplicationContext.(ClassPathXmlApplicationContext.java:93)
    at org.apache.servicecomb.foundation.common.utils.BeanUtils.init(BeanUtils.java:37)
    at org.apache.servicecomb.foundation.common.utils.BeanUtils.init(BeanUtils.java:33)
    at com.huawei.appmarket.fmc.FmcTestMain.init(FmcTestMain.java:28)
    at com.huawei.appmarket.fmc.FmcTestMain.main(FmcTestMain.java:33)
Caused by: java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.String
    at org.apache.servicecomb.foundation.ssl.SSLOption.getStringProperty(SSLOption.java:267)
    at org.apache.servicecomb.foundation.ssl.SSLOption.buildFromYaml(SSLOption.java:365)
    at org.apache.servicecomb.config.client.ConfigCenterClient.createHttpClientOptions(ConfigCenterClient.java:216)
    at org.apache.servicecomb.config.client.ConfigCenterClient.deployConfigClient(ConfigCenterClient.java:192)
    at org.apache.servicecomb.config.client.ConfigCenterClient.connectServer(ConfigCenterClient.java:133)
    at org.apache.servicecomb.config.archaius.sources.ConfigCenterConfigurationSourceImpl.init(ConfigCenterConfigurationSourceImpl.java:70)
    at org.apache.servicecomb.config.archaius.sources.ConfigCenterConfigurationSourceImpl.init(ConfigCenterConfigurationSourceImpl.java:76)
    at org.apache.servicecomb.config.ConfigUtil.installDynamicConfig(ConfigUtil.java:257)
    at org.apache.servicecomb.config.ConfigurationSpringInitializer.setEnvironment(ConfigurationSpringInitializer.java:65)
    at org.springframework.context.support.ApplicationContextAwareProcessor.invokeAwareInterfaces(ApplicationContextAwareProcessor.java:106)
    at org.springframework.context.support.ApplicationContextAwareProcessor.postProcessBeforeInitialization(ApplicationContextAwareProcessor.java:97)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:409)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1626)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:555)

原因：microservice.yaml文件里面ssl配置有数字格式，需要使用引号引起来

3、使用RPC方式调用出现空指针，使用RestTemplate调用没问题

Caused by: java.lang.NullPointerException
    at org.apache.servicecomb.common.rest.definition.path.AbstractUrlParamWriter.getParamValue(AbstractUrlParamWriter.java:30)
    at org.apache.servicecomb.common.rest.definition.path.PathVarParamWriter.write(PathVarParamWriter.java:32)
    at org.apache.servicecomb.common.rest.definition.path.URLPathBuilder.genPathString(URLPathBuilder.java:111)
    at org.apache.servicecomb.common.rest.definition.path.URLPathBuilder.createRequestPath(URLPathBuilder.java:97)
    at org.apache.servicecomb.transport.rest.client.http.RestClientInvocation.createRequestPath(RestClientInvocation.java:211)
    at org.apache.servicecomb.transport.rest.client.http.RestClientInvocation.invoke(RestClientInvocation.java:81)
    at org.apache.servicecomb.transport.rest.client.RestTransportClient.send(RestTransportClient.java:103)

原因： 接口定义了一个path参数，但是客户端没有传入，会导致设置参数的时候为null

4、ServiceComb使用kill pid不能触发优雅停机，但是可以使用kill -1 pid来触发
原因： 业务代码使用JAVA的sun.misc.SignalHandler机制自己接收了信号量，导致优雅停机的shutDownHook机制不起作用