ClassInstance

搭建spring boot + dubbo微服务时，有个服务工程一直报错：

Caused by: java.lang.NoClassDefFoundError: org/apache/curator/utils/DefaultZookeeperFactory
	at org.apache.curator.framework.CuratorFrameworkFactory.<clinit>(CuratorFrameworkFactory.java:66) ~[curator-framework-4.0.1.jar:4.0.1]
	at org.apache.dubbo.remoting.zookeeper.curator.CuratorZookeeperClient.<init>(CuratorZookeeperClient.java:66) ~[dubbo-2.7.4.1.jar:2.7.4.1]
	at org.apache.dubbo.remoting.zookeeper.curator.CuratorZookeeperTransporter.createZookeeperClient(CuratorZookeeperTransporter.java:26) ~[dubbo-2.7.4.1.jar:2.7.4.1]
	at org.apache.dubbo.remoting.zookeeper.support.AbstractZookeeperTransporter.connect(AbstractZookeeperTransporter.java:68) ~[dubbo-2.7.4.1.jar:2.7.4.1]
	at org.apache.dubbo.remoting.zookeeper.ZookeeperTransporter$Adaptive.connect(ZookeeperTransporter$Adaptive.java) ~[dubbo-2.7.4.1.jar:2.7.4.1]
	at org.apache.dubbo.configcenter.support.zookeeper.ZookeeperDynamicConfiguration.<init>(ZookeeperDynamicConfiguration.java:62) ~[dubbo-2.7.4.1.jar:2.7.4.1]
	at org.apache.dubbo.configcenter.support.zookeeper.ZookeeperDynamicConfigurationFactory.createDynamicConfiguration(ZookeeperDynamicConfigurationFactory.java:37) ~[dubbo-2.7.4.1.jar:2.7.4.1]
	at org.apache.dubbo.configcenter.AbstractDynamicConfigurationFactory.getDynamicConfiguration(AbstractDynamicConfigurationFactory.java:33) ~[dubbo-2.7.4.1.jar:2.7.4.1]
	at org.apache.dubbo.config.AbstractInterfaceConfig.getDynamicConfiguration(AbstractInterfaceConfig.java:315) ~[dubbo-2.7.4.1.jar:2.7.4.1]
	at org.apache.dubbo.config.AbstractInterfaceConfig.prepareEnvironment(AbstractInterfaceConfig.java:290) ~[dubbo-2.7.4.1.jar:2.7.4.1]
	at org.apache.dubbo.config.AbstractInterfaceConfig.startConfigCenter(AbstractInterfaceConfig.java:280) ~[dubbo-2.7.4.1.jar:2.7.4.1]
	at org.apache.dubbo.config.AbstractInterfaceConfig.lambda$null$7(AbstractInterfaceConfig.java:636) ~[dubbo-2.7.4.1.jar:2.7.4.1]
	at java.util.Optional.orElseGet(Optional.java:267) ~[na:1.8.0_111]
	at org.apache.dubbo.config.AbstractInterfaceConfig.lambda$useRegistryForConfigIfNecessary$8(AbstractInterfaceConfig.java:620) ~[dubbo-2.7.4.1.jar:2.7.4.1]
	at java.util.Optional.ifPresent(Optional.java:159) ~[na:1.8.0_111]
	at org.apache.dubbo.config.AbstractInterfaceConfig.useRegistryForConfigIfNecessary(AbstractInterfaceConfig.java:618) ~[dubbo-2.7.4.1.jar:2.7.4.1]
	at org.apache.dubbo.config.AbstractInterfaceConfig.checkRegistry(AbstractInterfaceConfig.java:208) ~[dubbo-2.7.4.1.jar:2.7.4.1]
	at org.apache.dubbo.config.ReferenceConfig.createProxy(ReferenceConfig.java:378) ~[dubbo-2.7.4.1.jar:2.7.4.1]
	at org.apache.dubbo.config.ReferenceConfig.init(ReferenceConfig.java:329) ~[dubbo-2.7.4.1.jar:2.7.4.1]
	at org.apache.dubbo.config.ReferenceConfig.get(ReferenceConfig.java:250) ~[dubbo-2.7.4.1.jar:2.7.4.1]
	at org.apache.dubbo.config.spring.beans.factory.annotation.ReferenceAnnotationBeanPostProcessor.getOrCreateProxy(ReferenceAnnotationBeanPostProcessor.java:246) ~[dubbo-2.7.4.1.jar:2.7.4.1]
	at org.apache.dubbo.config.spring.beans.factory.annotation.ReferenceAnnotationBeanPostProcessor.doGetInjectedBean(ReferenceAnnotationBeanPostProcessor.java:143) ~[dubbo-2.7.4.1.jar:2.7.4.1]
	at org.apache.dubbo.config.spring.beans.factory.annotation.AnnotationInjectedBeanPostProcessor.getInjectedObject(AnnotationInjectedBeanPostProcessor.java:359) ~[dubbo-2.7.4.1.jar:2.7.4.1]
	at org.apache.dubbo.config.spring.beans.factory.annotation.AnnotationInjectedBeanPostProcessor$AnnotatedFieldElement.inject(AnnotationInjectedBeanPostProcessor.java:539) ~[dubbo-2.7.4.1.jar:2.7.4.1]
	at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:116) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
	at org.apache.dubbo.config.spring.beans.factory.annotation.AnnotationInjectedBeanPostProcessor.postProcessPropertyValues(AnnotationInjectedBeanPostProcessor.java:146) ~[dubbo-2.7.4.1.jar:2.7.4.1]
	... 30 common frames omitted
Caused by: java.lang.ClassNotFoundException: org.apache.curator.utils.DefaultZookeeperFactory
	at java.net.URLClassLoader.findClass(URLClassLoader.java:381) ~[na:1.8.0_111]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[na:1.8.0_111]
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331) ~[na:1.8.0_111]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[na:1.8.0_111]
	... 56 common frames omitted

maven pom如下：

		<dependency>
			<groupId>org.apache.curator</groupId>
			<artifactId>curator-framework</artifactId>
		</dependency>

		<dependency>
			<groupId>org.apache.curator</groupId>
			<artifactId>curator-recipes</artifactId>
		</dependency>

		<dependency>
			<groupId>org.apache.zookeeper</groupId>
			<artifactId>zookeeper</artifactId>
		</dependency>