imaffe edited a comment on issue #540:
URL:
https://github.com/apache/rocketmq-externals/issues/540#issuecomment-616260356
I was trying to solve this Cassandra driver related error. I met this as
well when I was testing the driver with a demo project. Stackoverflow says it
is because of the netty dependency issue.
error when creating cqlSession java.lang.AbstractMethodError
java.util.concurrent.ExecutionException: java.lang.AbstractMethodError
at java.util.concurrent.FutureTask.report(FutureTask.java:122)
at java.util.concurrent.FutureTask.get(FutureTask.java:192)
at
org.apache.rocketmq.connect.cassandra.common.DBUtils.initCqlSession(DBUtils.java:83)
at
org.apache.rocketmq.connect.cassandra.connector.CassandraSinkTask.start(CassandraSinkTask.java:113)
at
org.apache.rocketmq.connect.runtime.connectorwrapper.WorkerSinkTask.run(WorkerSinkTask.java:263)
at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.AbstractMethodError
at
io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:64)
at
io.netty.channel.MultithreadEventLoopGroup.<init>(MultithreadEventLoopGroup.java:49)
at
io.netty.channel.DefaultEventLoopGroup.<init>(DefaultEventLoopGroup.java:58)
at
com.datastax.oss.driver.internal.core.context.DefaultNettyOptions.<init>(DefaultNettyOptions.java:92)
at
com.datastax.oss.driver.internal.core.context.DefaultDriverContext.buildNettyOptions(DefaultDriverContext.java:463)
at
com.datastax.oss.driver.internal.core.util.concurrent.LazyReference.get(LazyReference.java:55)
at
com.datastax.oss.driver.internal.core.context.DefaultDriverContext.getNettyOptions(DefaultDriverContext.java:806)
at
com.datastax.oss.driver.internal.core.session.DefaultSession.<init>(DefaultSession.java:100)
at
com.datastax.oss.driver.internal.core.session.DefaultSession.init(DefaultSession.java:85)
at
com.datastax.oss.driver.api.core.session.SessionBuilder.buildDefaultSessionAsync(SessionBuilder.java:665)
at
com.datastax.oss.driver.api.core.session.SessionBuilder.buildAsync(SessionBuilder.java:598)
at
com.datastax.oss.driver.api.core.session.SessionBuilder.build(SessionBuilder.java:612)
at
org.apache.rocketmq.connect.cassandra.common.DBUtils$1.call(DBUtils.java:79)
at
org.apache.rocketmq.connect.cassandra.common.DBUtils$1.call(DBUtils.java:76)
EDIT: I found the netty in
```
<!-- <dependency>-->
<!-- <groupId>org.apache.rocketmq</groupId>-->
<!-- <artifactId>rocketmq-client</artifactId>-->
<!-- <version>4.3.0</version>-->
<!-- </dependency>-->
```
is conflicting with the Cassandra data driver, we might need to find out way
to shade the dependencies.
https://stackoverflow.com/questions/43145196/exception-while-calling-cassandra-and-elastic-search-from-same-program
EDIT 2: This is really a cool chance to learn the maven dependency system.
Other plugins might face the similar issue (I already met one dependency
conflicts before)
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