Docker Tomcat容器错误：引起：java.lang.NoClassDefFoundError--在Kubernetes中部署时

Question

我对这个问题感到困惑，我已经花了大约3天时间做了大量调试/研究尝试无济于事。

我有一个Tomcat的docker容器，部署了WAR。此容器在启动时可以正常工作（独立或在docker-compose中）。但是，当此容器部署在kubernetes集群中时，Tomcat无法部署WAR应用程序。由于以下例外：

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'searchIndexServiceProxyEs' defined in ServletContext resource [/WEB-INF/index-clients_es_portal.xml]: Invocation of init method failed; nested exception is java.lang.NoClassDefFoundError: Could not initialize class org.apache.log4j.LogManager
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1574)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:539)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:476)
        at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:303)
        at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
        at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:299)
        at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194)
        at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:351)
        ... 100 more
Caused by: java.lang.NoClassDefFoundError: Could not initialize class org.apache.log4j.LogManager
        at org.apache.log4j.Logger.getLogger(Logger.java:104)
        at org.elasticsearch.common.logging.log4j.Log4jESLoggerFactory.newInstance(Log4jESLoggerFactory.java:38)
        at org.elasticsearch.common.logging.ESLoggerFactory.newInstance(ESLoggerFactory.java:82)
        at org.elasticsearch.common.logging.ESLoggerFactory.getLogger(ESLoggerFactory.java:66)
        at org.elasticsearch.common.logging.Loggers.getLogger(Loggers.java:121)
        at org.elasticsearch.common.settings.Settings.<clinit>(Settings.java:63)
        at com.esri.gw.index.elasticsearch.portal.ElasticSearchClient.init(ElasticSearchClient.java:100)
        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.support.AbstractAutowireCapableBeanFactory.invokeCustomInitMethod(AbstractAutowireCapableBeanFactory.java:1702)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1641)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1570)
        ... 107 more

我确认log4j jar存在于WEB-INF/lib中，并通过将-verbose:class添加到tomcat JAVA_OPTS来加载，这是在catalina启动时在上述错误之前输出的：

[Loaded org.elasticsearch.common.logging.DeprecationLogger from file:/home/root/apache-tomcat-7.0.72/webapps/app%23sharing/WEB-INF/lib/elasticsearch-2.3.2.jar]                           
[Loaded org.elasticsearch.common.logging.Loggers from file:/home/root/apache-tomcat-7.0.72/webapps/app%23sharing/WEB-INF/lib/elasticsearch-2.3.2.jar]                                     
[Loaded org.elasticsearch.common.Classes from file:/home/root/apache-tomcat-7.0.72/webapps/app%23sharing/WEB-INF/lib/elasticsearch-2.3.2.jar]                                             
[Loaded org.elasticsearch.common.logging.ESLoggerFactory from file:/home/root/apache-tomcat-7.0.72/webapps/app%23sharing/WEB-INF/lib/elasticsearch-2.3.2.jar][Loaded org.elasticsearch.com
mon.logging.jdk.JdkESLoggerFactory from file:/home/root/apache-tomcat-7.0.72/webapps/app%23sharing/WEB-INF/lib/elasticsearch-2.3.2.jar]                                                   
[Loaded org.elasticsearch.common.logging.log4j.Log4jESLoggerFactory from file:/home/root/apache-tomcat-7.0.72/webapps/app%23sharing/WEB-INF/lib/elasticsearch-2.3.2.jar]                  
[Loaded org.elasticsearch.common.logging.slf4j.Slf4jESLoggerFactory from file:/home/root/apache-tomcat-7.0.72/webapps/app%23sharing/WEB-INF/lib/elasticsearch-2.3.2.jar]                  
[Loaded org.elasticsearch.common.logging.ESLogger from file:/home/root/apache-tomcat-7.0.72/webapps/app%23sharing/WEB-INF/lib/elasticsearch-2.3.2.jar]                                    
[Loaded org.apache.log4j.spi.LoggingEvent from file:/home/root/apache-tomcat-7.0.72/lib/log4j-1.2.16.jar]                                                                                    
[Loaded org.springframework.core.NestedExceptionUtils from file:/home/root/apache-tomcat-7.0.72/webapps/app%23sharing/WEB-INF/lib/spring-core-4.1.6.RELEASE.jar]                          
[Loaded java.lang.Throwable$PrintStreamOrWriter from /home/root/java/jdk1.8.0_111/jre/lib/rt.jar]                                                                                            
[Loaded java.lang.Throwable$WrappedPrintWriter from /home/root/java/jdk1.8.0_111/jre/lib/rt.jar]                                                                                             
[Loaded java.util.IdentityHashMap$KeySet from /home/root/java/jdk1.8.0_111/jre/lib/rt.jar]        

如何解决这个问题？为什么只有当容器被部署到运行docker v1.2的k8s v1.9时才会出现？

编辑：这不是Copying files from host to Docker container

的副本