com.google.common.collect.Sets$SetView.iterator()Lcom/google/common/collect/UnmodifiableIterator；

项目场景：

项目场景：使用java对docker容器实现监听

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问题描述：

然而注入docker-java依赖之后启动项目时报以下错误，以至于项目启动不起来。

java.lang.NoSuchMethodError: com.google.common.collect.Sets$SetView.iterator()Lcom/google/common/collect/UnmodifiableIterator;
	at org.reflections.Reflections.expandSuperTypes(Reflections.java:380)
	at org.reflections.Reflections.<init>(Reflections.java:126)
	at org.reflections.Reflections.<init>(Reflections.java:168)
	at org.reflections.Reflections.<init>(Reflections.java:141)
	at com.alibaba.nacos.api.remote.PayloadRegistry.scan(PayloadRegistry.java:56)
	at com.alibaba.nacos.api.remote.PayloadRegistry.init(PayloadRegistry.java:44)
	at com.alibaba.nacos.common.remote.client.RpcClient.<clinit>(RpcClient.java:109)
	at com.alibaba.nacos.common.remote.client.RpcClientFactory.lambda$createClient$0(RpcClientFactory.java:79)
	at java.util.concurrent.ConcurrentHashMap.compute(ConcurrentHashMap.java:1853)
	at com.alibaba.nacos.common.remote.client.RpcClientFactory.createClient(RpcClientFactory.java:75)
	at com.alibaba.nacos.client.config.impl.ClientWorker$ConfigRpcTransportClient.ensureRpcClient(ClientWorker.java:936)
	at com.alibaba.nacos.client.config.impl.ClientWorker$ConfigRpcTransportClient.getOneRunningClient(ClientWorker.java:1104)
	at com.alibaba.nacos.client.config.impl.ClientWorker$ConfigRpcTransportClient.queryConfig(ClientWorker.java:996)
	at com.alibaba.nacos.client.config.impl.ClientWorker.getServerConfig(ClientWorker.java:407)
	at com.alibaba.nacos.client.config.NacosConfigService.getConfigInner(NacosConfigService.java:166)
	at com.alibaba.nacos.client.config.NacosConfigService.getConfig(NacosConfigService.java:94)
	at com.alibaba.cloud.nacos.client.NacosPropertySourceBuilder.loadNacosData(NacosPropertySourceBuilder.java:85)
	at com.alibaba.cloud.nacos.client.NacosPropertySourceBuilder.build(NacosPropertySourceBuilder.java:73)
	at com.alibaba.cloud.nacos.client.NacosPropertySourceLocator.loadNacosPropertySource(NacosPropertySourceLocator.java:199)
	at com.alibaba.cloud.nacos.client.NacosPropertySourceLocator.loadNacosDataIfPresent(NacosPropertySourceLocator.java:186)
	at com.alibaba.cloud.nacos.client.NacosPropertySourceLocator.loadNacosConfiguration(NacosPropertySourceLocator.java:158)
	at com.alibaba.cloud.nacos.client.NacosPropertySourceLocator.loadSharedConfiguration(NacosPropertySourceLocator.java:116)
	at com.alibaba.cloud.nacos.client.NacosPropertySourceLocator.locate(NacosPropertySourceLocator.java:101)
	at org.springframework.cloud.bootstrap.config.PropertySourceLocator.locateCollection(PropertySourceLocator.java:51)
	at org.springframework.cloud.bootstrap.config.PropertySourceLocator.locateCollection(PropertySourceLocator.java:47)
	at org.springframework.cloud.bootstrap.config.PropertySourceBootstrapConfiguration.initialize(PropertySourceBootstrapConfiguration.java:95)
	at org.springframework.boot.SpringApplication.applyInitializers(SpringApplication.java:634)
	at org.springframework.boot.SpringApplication.prepareContext(SpringApplication.java:403)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:337)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1343)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1332)
	at com.cdzs.CdzsDeviceApplication.main(CdzsDeviceApplication.java:45)
09:51:49.986 [Thread-2] WARN  c.a.n.c.h.HttpClientBeanHolder - [shutdown,108] - [HttpClientBeanHolder] Start destroying common HttpClient

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原因分析：

百度了很多这个bug，基本都说是guava版本冲突。意思是需要guava版本 >= 20才能使org.reflections正常工作。

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解决方案：

经过各种升降guava版本和百度之后最终在stackoverflow找到解决办法，只需要把pom文件中的引起冲突的依赖exclude guava就可以解决。

	<dependency>
        <groupId>com.github.docker-java</groupId>
        <artifactId>docker-java</artifactId>
        <version>3.2.12</version>
        <exclusions>
            <exclusion>
                <groupId>com.google.guava</groupId>
                <artifactId>guava</artifactId>
            </exclusion>
        </exclusions>
    </dependency>