imaffe commented on issue #561:
URL:
https://github.com/apache/rocketmq-externals/issues/561#issuecomment-618100006
**Cassandra datastax driver depends on a netty version conflict with the
rocketmq netty dependency.**
Using the official non-shaded datastax-java-driver would result in following
error message when trying to create a CqlSession
```
Exception in thread "main" 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)
```
according to
https://search.maven.org/artifact/com.datastax.oss/java-driver-core-shaded/4.5.1/jar
and
https://stackoverflow.com/questions/43145196/exception-while-calling-cassandra-and-elastic-search-from-same-program
we can use this dependency
```
<dependency>
<groupId>com.datastax.oss</groupId>
<artifactId>java-driver-core-shaded</artifactId>
<version>4.5.1</version>
</dependency>
```
and it should be good
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