最近由于要改kafka成datahub，于是在pom文件上引入了

<dependency>
    <groupId>com.aliyun.datahub</groupId>
    <artifactId>aliyun-sdk-datahub</artifactId>
    <version>2.25.1</version>
</dependency>

然后让我去测试同事关于datahub的代码，但是我一拉下代码来，项目都跑不起来，就是一顿错呀，

Class path contains multiple SLF4J bindings.

大概意思就是这个slf4j绑定的时候有两个东西要绑定，slf4j就不知道绑定谁了，错误我是知道咋回事，但是不知道咋解决啊喂，周五下午一顿烦躁中解决，加上中秋节后三天上班鼻子塞的像水泥地，白天晚上鼻子不通气，完全没状态搞，终于周末还是内心烦躁，不解决这个问题，我的项目工作就没法往下继续啊，我的测试代码工作还没搞呢啊喂，终于周日上午也就是今天，内心做了好久的斗争，还是打开电脑搞一下吧，碰巧遇到了一篇很不错的文章，解决了这个问题，还真的是因为引入了这个datahub，导致又引入了log4j12，才会使slf4j不知道绑定谁了。

mvn dependency:tree 查看了下

+- com.aliyun.datahub:aliyun-sdk-datahub:jar:2.25.1:compile
[INFO] |  +- com.squareup.retrofit2:retrofit:jar:2.9.0:compile
[INFO] |  +- com.squareup.retrofit2:converter-jackson:jar:2.9.0:compile
[INFO] |  +- com.fasterxml.jackson.core:jackson-databind:jar:2.11.4:compile
[INFO] |  |  +- com.fasterxml.jackson.core:jackson-annotations:jar:2.11.4:compile
[INFO] |  |  \- com.fasterxml.jackson.core:jackson-core:jar:2.11.4:compile
[INFO] |  +- com.squareup.okhttp3:okhttp:jar:3.14.9:compile
[INFO] |  |  \- com.squareup.okio:okio:jar:1.17.2:compile
[INFO] |  +- com.squareup.okhttp3:logging-interceptor:jar:3.14.9:compile
[INFO] |  +- com.google.code.findbugs:jsr305:jar:3.0.2:compile
[INFO] |  +- commons-codec:commons-codec:jar:1.14:compile
[INFO] |  +- org.lz4:lz4-java:jar:1.4.0:compile
[INFO] |  +- com.github.luben:zstd-jni:jar:1.5.5-4:compile
[INFO] |  +- commons-io:commons-io:jar:1.3.2:compile
[INFO] |  +- io.dropwizard.metrics:metrics-core:jar:4.1.22:compile
[INFO] |  +- io.dropwizard.metrics:metrics-json:jar:4.1.22:compile
[INFO] |  +- com.google.protobuf:protobuf-java:jar:2.6.1:compile
[INFO] |  +- org.apache.commons:commons-lang3:jar:3.10:compile
[INFO] |  +- com.google.guava:guava:jar:30.1.1-jre:compile
[INFO] |  |  +- com.google.guava:failureaccess:jar:1.0.1:compile
[INFO] |  |  +- com.google.guava:listenablefuture:jar:9999.0-empty-to-avoid-conflict-with-guava:compile
[INFO] |  |  +- org.checkerframework:checker-qual:jar:3.8.0:compile
[INFO] |  |  +- com.google.errorprone:error_prone_annotations:jar:2.5.1:compile
[INFO] |  |  \- com.google.j2objc:j2objc-annotations:jar:1.3:compile
[INFO] |  +- org.slf4j:slf4j-api:jar:1.7.30:compile
[INFO] |  +- org.slf4j:slf4j-log4j12:jar:1.7.30:compile
[INFO] |  |  \- log4j:log4j:jar:1.2.17:compile
[INFO] |  +- org.apache.arrow:arrow-vector:jar:11.0.0:compile
[INFO] |  |  +- org.apache.arrow:arrow-format:jar:11.0.0:compile
[INFO] |  |  +- org.apache.arrow:arrow-memory-core:jar:11.0.0:compile
[INFO] |  |  +- com.fasterxml.jackson.datatype:jackson-datatype-jsr310:jar:2.11.4:compile
[INFO] |  |  +- io.netty:netty-common:jar:4.1.65.Final:compile
[INFO] |  |  \- com.google.flatbuffers:flatbuffers-java:jar:1.12.0:compile
[INFO] |  +- org.apache.arrow:arrow-memory-netty:jar:11.0.0:compile
[INFO] |  |  \- io.netty:netty-buffer:jar:4.1.65.Final:compile
[INFO] |  +- org.apache.commons:commons-pool2:jar:2.8.1:compile
[INFO] |  \- org.apache.avro:avro:jar:1.11.1:compile
[INFO] |     \- org.apache.commons:commons-compress:jar:1.21:compile

参考文章：解决SLF4J: Class path contains multiple SLF4J bindings.-CSDN博客