java.lang.NoClassDefFoundError: org/apache/http/ssl/TrustStrategy
        at com.aliyun.openservices.log.Client.<init>(Client.java:273)
        at com.aliyun.openservices.log.Client.<init>(Client.java:218)
        at com.aliyun.openservices.log.Client.<init>(Client.java:191)
        at com.aliyun.openservices.log.producer.inner.ClientPool.updateClient(ClientPool.java:34)
        at com.aliyun.openservices.log.producer.LogProducer.setProjectConfig(LogProducer.java:23)
        at com.aliyun.openservices.log.flink.FlinkLogProducer.open(FlinkLogProducer.java:94)
        at org.apache.flink.api.common.functions.util.FunctionUtils.openFunction(FunctionUtils.java:36)
        at org.apache.flink.streaming.api.operators.AbstractUdfStreamOperator.open(AbstractUdfStreamOperator.java:102)
        at org.apache.flink.streaming.api.operators.StreamSink.open(StreamSink.java:48)
        at org.apache.flink.streaming.runtime.tasks.StreamTask.openAllOperators(StreamTask.java:532)
        at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:396)
        at org.apache.flink.runtime.taskmanager.Task.doRun(Task.java:705)
        at org.apache.flink.runtime.taskmanager.Task.run(Task.java:530)
        at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.ClassNotFoundException: org.apache.http.ssl.TrustStrategy
        at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
        at org.apache.flink.util.ChildFirstClassLoader.loadClass(ChildFirstClassLoader.java:69)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:357)

解决方法:

<dependency>
    <groupId>com.aliyun.openservices</groupId>
    <artifactId>flink-log-connector</artifactId>
    <version>0.1.18</version>
</dependency>

或者

<dependency>
    <groupId>com.aliyun.oss</groupId>
    <artifactId>aliyun-sdk-oss</artifactId>
    <version>2.5.0</version>
</dependency>

原因：因为阿里云sdk自动依赖了httpclient-4.4.1和httpcore-4.4.1跟项目中引入的httpclient其他版本冲突了。

 <dependency>
            <groupId>com.aliyun.openservices</groupId>
            <artifactId>flink-log-connector</artifactId>
            <version>0.1.18</version>
            <exclusions>
                <exclusion>
                    <artifactId>httpclient</artifactId>
                    <groupId>org.apache.httpcomponents</groupId>
                </exclusion>
            </exclusions>
        </dependency>

并且引入

<dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpcore</artifactId>
            <version>4.4.3</version>
        </dependency>
        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpclient</artifactId>
            <version>4.5.1</version>
        </dependency>

 <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpcore</artifactId>
            <version>4.4.3</version>
        </dependency>
        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpclient</artifactId>
            <version>4.5.1</version>
        </dependency>

这样就完美解决了