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java.util.ConcurrentModificationException: 	at java.util.LinkedList$ListItr.checkForComodification(LinkedList.java:953)	at java.util.LinkedList$ListItr.next(LinkedList.java:886)	at org.springframework.core.env.PropertySourcesPropertyResolver.containsProperty(PropertySourcesPropertyResolver.java:49)	at org.springframework.core.env.AbstractEnvironment.containsProperty(AbstractEnvironment.java:460)	at org.springframework.cloud.netflix.archaius.ConfigurableEnvironmentConfiguration.containsKey(ConfigurableEnvironmentConfiguration.java:43)	at com.netflix.config.ConcurrentCompositeConfiguration.getSource(ConcurrentCompositeConfiguration.java:864)	at com.netflix.config.ConcurrentCompositeConfiguration$1.configurationChanged(ConcurrentCompositeConfiguration.java:151)	at com.netflix.config.ConcurrentMapConfiguration.fireEvent(ConcurrentMapConfiguration.java:312)	at com.netflix.config.ConcurrentMapConfiguration.setProperty(ConcurrentMapConfiguration.java:216)	at com.netflix.config.ConcurrentCompositeConfiguration.setProperty(ConcurrentCompositeConfiguration.java:486)	at com.netflix.eureka.cluster.PeerEurekaNode.getBatcher(PeerEurekaNode.java:806)	at com.netflix.eureka.cluster.PeerEurekaNode.(PeerEurekaNode.java:94)	at com.netflix.eureka.PeerAwareInstanceRegistry.updatePeerEurekaNodes(PeerAwareInstanceRegistry.java:219)	at com.netflix.eureka.PeerAwareInstanceRegistry.setupPeerEurekaNodes(PeerAwareInstanceRegistry.java:187)	at com.netflix.eureka.PeerAwareInstanceRegistry.init(PeerAwareInstanceRegistry.java:156)	at com.netflix.eureka.PeerAwareInstanceRegistry.(PeerAwareInstanceRegistry.java:144)	at com.netflix.eureka.PeerAwareInstanceRegistry.(PeerAwareInstanceRegistry.java:130)	at org.springframework.cloud.netflix.eureka.server.EurekaServerInitializerConfiguration$RegistryInstanceProxyInitializer.onApplicationEvent(EurekaServerInitializerConfiguration.java:174)	at org.springframework.cloud.netflix.eureka.server.EurekaServerInitializerConfiguration$RegistryInstanceProxyInitializer.onApplicationEvent(EurekaServerInitializerConfiguration.java:156)	at org.springframework.cloud.netflix.eureka.server.EurekaServerInitializerConfiguration$RegistryInstanceProxyInitializer$$EnhancerBySpringCGLIB$$e403e8f8.onApplicationEvent()	at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:98)	at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:333)	at org.springframework.cloud.netflix.eureka.server.EurekaServerInitializerConfiguration$1$1.initEurekaEnvironment(EurekaServerInitializerConfiguration.java:109)	at com.netflix.eureka.EurekaBootStrap.contextInitialized(EurekaBootStrap.java:88)	at org.springframework.cloud.netflix.eureka.server.EurekaServerInitializerConfiguration$1.run(EurekaServerInitializerConfiguration.java:100)	at java.lang.Thread.run(Thread.java:744)