解决：NoClassDefFoundError: org/apache/http/ssl/SSLContexts

开启TLS配置后，启动系统报错，在官方提供的fabric-sdk-java源码pom.xml中，发现对httpcomponent组件唯一的配置如下：

<!-- https://mvnrepository.com/artifact/org.apache.httpcomponents/httpclient -->
        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpclient</artifactId>
            <version>${httpclient.version}</version>
        </dependency>

整理下，配置如下，验证通过：

<properties>
	<httpclient.version>4.5.8</httpclient.version>
</properties>

<dependency>
	<groupId>org.apache.httpcomponents</groupId>
	<artifactId>httpclient</artifactId>
	<version>${httpclient.version}</version>
</dependency>