方案一：手动拷贝需要的相关jar包

flume对接HBASE报错，找不到相关的类：

报错hbase相关日志：

18 五月 2021 17:25:50,633 ERROR [lifecycleSupervisor-1-2] (org.apache.flume.lifecycle.LifecycleSupervisor$MonitorRunnable.run:251)  - Unable to start SinkRunner: { policy:org.apache.flume.sink.DefaultSinkProcessor@4b591129 counterGroup:{ name:null counters:{} } } - Exception follows.
java.lang.NoClassDefFoundError: org/apache/hadoop/hbase/protobuf/generated/MasterProtos$MasterService$BlockingInterface

则需要将hbase lib下的相关包拷贝到flume lib目录下：

scp hbase*.jar xxx.xx.x.xx:/home/root/programs/flume/lib/ 
scp metrics*.jar xxx.xx.x.xx:/home/root/programs/flume/lib/ 
scp netty*.jar xxx.xx.x.xx:/home/root/programs/flume/lib/ 
scp protobuf*.jar xxx.xx.x.xx:/home/root/programs/flume/lib/ 

报错zk相关日志：

18 五月 2021 16:55:13,343 ERROR [lifecycleSupervisor-1-2] (org.apache.flume.lifecycle.LifecycleSupervisor$MonitorRunnable.run:251)  - Unable to start SinkRunner: { policy:org.apache.flume.sink.DefaultSinkProcessor@4e3d6202 counterGroup:{ name:null counters:{} } } - Exception follows.
java.lang.NoClassDefFoundError: org/apache/zookeeper/Watcher
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:756)
        at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:468)
        at java.net.URLClassLoader.access$100(URLClassLoader.java:74)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:369)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:363)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:362)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:352)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
        at org.hbase.async.HBaseClient.<init>(HBaseClient.java:539)
        at org.apache.flume.sink.hbase.AsyncHBaseSink.initHBaseClient(AsyncHBaseSink.java:448)
        at org.apache.flume.sink.hbase.AsyncHBaseSink.start(AsyncHBaseSink.java:438)
        at org.apache.flume.sink.DefaultSinkProcessor.start(DefaultSinkProcessor.java:45)
        at org.apache.flume.SinkRunner.start(SinkRunner.java:79)
        at org.apache.flume.lifecycle.LifecycleSupervisor$MonitorRunnable.run(LifecycleSupervisor.java:249)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.ClassNotFoundException: org.apache.zookeeper.Watcher
        at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:352)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
        ... 25 more

则需要把zk相关jar（zookeeper-3.4.6.jar、zookeeper-jute-3.5.8.jar）包拷贝到flume lib下 ；

方案二：

配置相关服务的环境变量

ps：本质这种框架一般都是指定入口类，调动相关jar包进行程序服务，缺少哪些类 报错日志一般会详细指明，还是要仔细观察相关报错日志内容

参考：

hbase连接测试时的常见错误

java.lang.ClassNotFoundException: org.apache.hadoop.hbase.HBaseConfiguration

https://www.fatalerrors.org/a/java.lang.noclassdeffounderror-io-netty-channel-eventloopgroup.html