[Bug] failed to produce message with rocketMQ producer about rop

[xiaozongyang]

When I change rop to version 0.2.0-SNAPSHOT which built with brach master (git revision 10828842612cff48dc59d3e8f8f2fdd2d96ddac8). The puslar standalone server can't start and following errors are showing in log

11:38:34.963 [BrokerControllerScheduledThread1] ERROR org.streamnative.pulsar.handlers.rocketmq.inner.RocketMQBrokerController - schedule persist consumerOffset error.
java.lang.BootstrapMethodError: java.lang.NoClassDefFoundError: org/streamnative/pulsar/handlers/rocketmq/inner/producer/ClientGroupAndTopicName
        at org.streamnative.pulsar.handlers.rocketmq.inner.consumer.ConsumerOffsetManager.createOffsetTableSnapshot(ConsumerOffsetManager.java:462) ~[pulsar-protocol-handler-rocketmq-0.2.0-SNAPSHOT.nar-unpacked/:?]
        at org.streamnative.pulsar.handlers.rocketmq.inner.consumer.ConsumerOffsetManager.neededPersistentOffsetTable(ConsumerOffsetManager.java:472) ~[pulsar-protocol-handler-rocketmq-0.2.0-SNAPSHOT.nar-unpacked/:?]
        at org.streamnative.pulsar.handlers.rocketmq.inner.consumer.ConsumerOffsetManager.persist(ConsumerOffsetManager.java:412) ~[pulsar-protocol-handler-rocketmq-0.2.0-SNAPSHOT.nar-unpacked/:?]
        at org.streamnative.pulsar.handlers.rocketmq.inner.RocketMQBrokerController$2.run(RocketMQBrokerController.java:243) [pulsar-protocol-handler-rocketmq-0.2.0-SNAPSHOT.nar-unpacked/:?]
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_192]
        at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308) [?:1.8.0_192]
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180) [?:1.8.0_192]
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294) [?:1.8.0_192]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_192]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_192]
        at java.lang.Thread.run(Thread.java:748) [?:1.8.0_192]
Caused by: java.lang.NoClassDefFoundError: org/streamnative/pulsar/handlers/rocketmq/inner/producer/ClientGroupAndTopicName
        ... 11 more
Caused by: java.lang.ClassNotFoundException: org.streamnative.pulsar.handlers.rocketmq.inner.producer.ClientGroupAndTopicName
        at java.net.URLClassLoader.findClass(URLClassLoader.java:382) ~[?:1.8.0_192]
        at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_192]
        at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_192]
        ... 11 more

[xiaozongyang]

When I add loadManagerClassName=org.apache.pulsar.broker.loadbalance.impl.ModularLoadManagerImpl to standalone.conf, this problem is solved.